Saint Ann, Missouri Weather Conditions

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Current Conditions

  • 70°
  • Thunderstorms and Rain
  • Wind: West 8 mph
  • Humidity: 88%
  • Visibility: 1.2 miles
  • Dew Point: 66°
  • Pressure: 29.97 in. +

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Next 12 Hours

10  pm
1  am
4  am
7  am
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Thunderstorm
T-storms
Thunderstorm
T-storms
Thunderstorm
T-storms
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
79°
75°
73°
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81°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Chance of a Thunderstorm
  • High: 86 °
  • Low: 72 °
  • Chance of T-Storms
  • Wednesday
  • Chance of a Thunderstorm
  • High: 90 °
  • Low: 79 °
  • Chance of T-Storms
  • Thursday
  • Partly Cloudy
  • High: 95 °
  • Low: 73 °
  • Partly Cloudy
  • Friday
  • Partly Cloudy
  • High: 91 °
  • Low: 70 °
  • Partly Cloudy
  • Saturday
  • Chance of a Thunderstorm
  • High: 75 °
  • Low: 57 °
  • Chance of T-Storms

Forecast for Saint Ann, Missouri

Updated: 10:00 PM CDT on September 01, 2014

Flash Flood Watch in effect until 7 am CDT Tuesday...
  • Monday

    Overcast with thunderstorms, then a chance of a thunderstorm and a chance of rain in the afternoon. High of 88F. Winds from the SW at 10 to 15 mph. Chance of rain 50%.

  • Monday Night

    Overcast with thunderstorms and rain showers. Low of 73F. Winds from the WSW at 5 to 10 mph. Chance of rain 90% with rainfall amounts near 1.4 in. possible.

  • Tuesday

    Overcast with a chance of a thunderstorm and a chance of rain in the morning, then partly cloudy. High of 86F with a heat index of 91F. Winds from the WNW at 5 to 10 mph. Chance of rain 30%.

  • Tuesday Night

    Partly cloudy with a chance of a thunderstorm and a chance of rain after midnight. Low of 72F. Winds less than 5 mph. Chance of rain 20%.

  • Wednesday

    Overcast with a chance of a thunderstorm and a chance of rain. High of 90F with a heat index of 95F. Winds from the SSE at 5 to 10 mph. Chance of rain 40%.

  • Wednesday Night

    Partly cloudy. Low of 79F. Winds from the South at 5 to 10 mph.

  • Thursday

    Mostly cloudy. High of 95F with a heat index of 104F. Winds from the SSW at 5 to 15 mph.

  • Thursday Night

    Partly cloudy. Low of 73F. Winds from the SSW at 5 to 10 mph.

  • Friday

    Partly cloudy. High of 91F with a heat index of 99F. Winds from the SW at 5 to 10 mph.

  • Friday Night

    Overcast with a chance of a thunderstorm and rain. Low of 70F. Winds from the SSW at 5 to 10 mph shifting to the NW after midnight. Chance of rain 50%.

  • Saturday

    Overcast with a chance of a thunderstorm and rain. High of 75F. Winds from the North at 5 to 10 mph. Chance of rain 40%.

  • Saturday Night

    Clear. Fog overnight. Low of 57F. Winds from the NNE at 5 to 10 mph.

  • Sunday

    Partly cloudy. High of 82F. Winds from the ENE at 5 to 10 mph.

  • Sunday Night

    Partly cloudy. Low of 55F. Winds from the East at 5 to 10 mph.

  • Monday

    Mostly cloudy. High of 81F. Winds from the ESE at 5 to 10 mph.

  • Monday Night

    Mostly cloudy with a chance of a thunderstorm. Low of 66F. Winds from the SE at 5 to 10 mph. Chance of rain 20%.

  • Tuesday

    Mostly cloudy with a chance of a thunderstorm. High of 91F. Winds from the South at 5 to 10 mph. Chance of rain 40%.

  • Tuesday Night

    Partly cloudy. Fog overnight. Low of 68F. Winds from the South at 5 to 10 mph.

  • Wednesday

    Clear. High of 95F. Winds from the SSW at 5 to 10 mph.

  • Wednesday Night

    Clear. Fog overnight. Low of 68F. Winds less than 5 mph.

  • Thursday

    Partly cloudy with a chance of a thunderstorm. High of 91F. Winds less than 5 mph. Chance of rain 40%.

  • Thursday Night

    Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 64F. Winds less than 5 mph. Chance of rain 40%.

  • Friday

    Clear with a chance of a thunderstorm. High of 88F. Winds less than 5 mph. Chance of rain 20%.

  • Friday Night

    Clear. Fog overnight. Low of 64F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Tornado Warning  Statement as of 11:07 PM CDT on September 1, 2014


The National Weather Service in St Louis has issued a

* Tornado Warning for...
northwestern Monroe County in southwest Illinois...
west central St. Clair County in southwest Illinois...
northeastern Jefferson County in east central Missouri...
south central St. Louis County in east central Missouri...

* until 1130 PM CDT

* at 1102 PM CDT... a severe thunderstorm capable of producing a
tornado was located near Arnold... and moving east at 45 mph.

Hazard... tornado and quarter size hail.

Source... radar indicated rotation.

Impact... flying debris will be dangerous to those caught without
           shelter. Mobile homes will be damaged or destroyed. Damage
           to roofs... windows and vehicles will occur. Tree damage is
           likely.

* This dangerous storm will be near...
Columbia and Dupo around 1115 PM CDT.
Cahokia around 1120 PM CDT.
Millstadt and Centreville around 1125 PM CDT.
Belleville and Swansea around 1130 PM CDT.

Other locations in the warning include new handover.

This warning includes mastodon historic site.

This warning also includes...
Interstate 55 in Missouri from exit 185 to exit 191.
Interstate 64 in Illinois from Exit 9 to Exit 23.

Precautionary/preparedness actions...

Take cover now. Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If in a Mobile home... a vehicle or
outdoors... move to the closest substantial shelter and protect
yourself from flying debris.


Lat... Lon 3843 8990 3834 9041 3851 9047 3855 9028
      3853 9026 3856 9024 3863 8996
time... Mot... loc 0407z 255deg 41kt 3845 9033

Tornado... radar indicated
hail... 1.00in


Truett



1101 PM CDT Mon Sep 1 2014

... A Tornado Warning remains in effect for south central St. Louis
and northeastern Jefferson counties until 1115 PM CDT...

At 1058 PM CDT... a severe thunderstorm capable of producing a tornado
was located near Murphy... and moving east at 40 mph.

Hazard... tornado and quarter size hail.

Source... radar indicated rotation.

Impact... flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs... windows and vehicles will occur. Tree damage is
         likely.

This dangerous storm will be near...
Crestwood around 1110 PM CDT.

This warning includes Castlewood State Park and Route 66 State Park.

This warning also includes...
Interstate 44 from exit 264 to exit 277.
Interstate 55 in Missouri from exit 190 to exit 191.

Precautionary/preparedness actions...

Take cover now. Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If in a Mobile home... a vehicle or
outdoors... move to the closest substantial shelter and protect
yourself from flying debris.


Lat... Lon 3840 9032 3835 9060 3852 9068 3864 9039
      3841 9031
time... Mot... loc 0402z 255deg 33kt 3846 9042

Tornado... radar indicated
hail... 1.00in


Truett




 Severe Thunderstorm Warning  Statement as of 10:33 PM CDT on September 1, 2014


The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
northeastern Franklin County in east central Missouri...
northwestern Jefferson County in east central Missouri...
St. Louis County in east central Missouri...

* until 1115 PM CDT

* at 1029 PM CDT... a severe thunderstorm was located near Pacific...
and moving east at 35 mph.

Hazard... 60 mph wind gusts and quarter size hail.

Source... radar indicated.

Impact... hail damage to vehicles is expected. Expect wind damage to
           roofs... siding and trees.

* Locations impacted include...
Eureka... Wildwood... Byrnes Mill... Ellisville... Clarkson Valley...
high ridge... Chesterfield... Ballwin... Murphy... Manchester... Valley
Park... Fenton... Town And Country... Des Peres... Sunset Hills...
Maryland Heights... Kirkwood... Creve Coeur... Frontenac and
Crestwood.

This warning includes babler Memorial State Park... Castlewood State
Park... Robertsville State Park and Route 66 State Park.

This warning also includes...
Interstate 44 from exit 253 to exit 277.

Precautionary/preparedness actions...

For your protection move to an interior room on the lowest floor of a
building.


Lat... Lon 3849 9027 3839 9081 3856 9085 3868 9060
      3868 9055 3870 9053 3871 9053 3879 9037
      3861 9031 3859 9032 3856 9029
time... Mot... loc 0333z 254deg 29kt 3851 9071

Tornado... possible
hail... 1.00in
wind... 60mph


Truett




 Severe Thunderstorm Watch  Statement as of 11:03 PM CDT on September 01, 2014


Severe Thunderstorm Watch 487 remains in effect until 200 am CDT

MO
. Missouri counties included are

Audrain Barry Barton
Bates Benton Boone
Callaway Camden Cass
Cedar Christian Cole
Cooper Crawford Dade
Dallas Dent Franklin
Gasconade Greene Henry
Hickory Iron Jasper
Jefferson Johnson Laclede
Lawrence Lincoln McDonald
Maries Miller Moniteau
Montgomery Morgan Newton
Osage Pettis Phelps
Pike Polk Pulaski
St. Charles St. Clair Ste. Genevieve
St. Francois St. Louis stone
Texas Vernon Warren
Washington Webster Wright




Missouri independent cities included are

St. Louis city



 Flash Flood Watch, Areal Flood Advisory  Statement as of 11:09 PM CDT on September 1, 2014


... Flash Flood Watch remains in effect until 7 am CDT Tuesday...

The Flash Flood Watch continues for

* portions of Illinois and Missouri... including the following
counties... in Illinois... Bond IL... Calhoun IL... Clinton IL...
Fayette IL... Greene IL... Jersey IL... Macoupin IL... Madison
IL... Marion IL... Monroe IL... Montgomery IL... Randolph IL...
St. Clair IL and Washington IL. In Missouri... Callaway MO...
Cole MO... Crawford MO... Franklin MO... Gasconade MO... Iron
MO... Jefferson MO... Lincoln MO... Madison MO... Moniteau MO...
Montgomery MO... Osage MO... Pike MO... Reynolds MO... St.
Charles MO... St. Francois MO... St. Louis city MO... St. Louis
MO... Ste. Genevieve MO... Warren MO and Washington MO.

* Until 7 am CDT Tuesday

* thunderstorms producing heavy rainfall are expected to train
over the area tonight. Widespread rainfall amounts between
1.5 and 2 inches are expected... with localized rainfalls of 3
to 4 inches. Areas along and south of the Interstate 44
corridor in Missouri... and along and south of the Interstate
70 corridor in Illinois are expected to get the heaviest
amounts of rain tonight.

* Heavy rainfall will result in flooding of low lying or poor
drainage areas... and ultimately dangerous flash flooding on
smaller creeks and streams. Significant rises on larger
streams and rivers will also be possible.

Precautionary/preparedness actions...

A Flash Flood Watch means that flash flooding is possible but not
imminent in the watch area. People in the watch area should be
aware of the possibility of heavy rainfall and flash flooding.
Check your preparedness requirements... especially if you live in
flood prone areas. Stay informed... and be ready for quick action
if flooding is observed or if a Flash Flood Warning is issued.




1052 PM CDT Mon Sep 1 2014

The National Weather Service in St Louis has issued an

* Urban and Small Stream Flood Advisory for...
northeastern Franklin County in east central Missouri...
northern Jefferson County in east central Missouri...
St. Charles County in east central Missouri...
St. Louis County in east central Missouri...
St. Louis city in east central Missouri...

* until 300 am CDT

* at 1050 PM CDT... National Weather Service Doppler radar indicated
thunderstorms with heavy rainfall across the advisory area. Doppler
radar estimated between one and two inches of rain in the past hour
over Saint Charles County. This area of heavy rain is moving east
into Saint Louis County... northern Jefferson and the city of Saint
Louis over the next hour or so.

* Runoff from this excessive rainfall will cause minor flooding to
occur... especially along small streams and near low water
crossings. Some locations that will experience minor flooding
include... Affton... Arnold... Ballwin... Bel-Ridge... Bellefontaine
Neighbors... Berkeley... Black Jack... Brentwood... Bridgeton... Byrnes
Mill... Chesterfield... Clarkson Valley... Clayton... Cool Valley...
Cottleville... Crestwood... Creve Coeur... Dardenne Prairie...
Dellwood... Des Peres... Ellisville... Eureka... Fenton... Ferguson...
Florissant... Frontenac... Glendale... Gray Summit... Hazelwood and
high ridge.

Precautionary/preparedness actions...

An Urban and Small Stream Flood Advisory means river or stream flows
are elevated or ponding of water in urban or other areas is occurring
or is imminent.


Lat... Lon 3878 9015 3873 9021 3866 9018 3862 9019
      3852 9027 3843 9030 3841 9099 3855 9097
      3878 9096 3891 9022 3884 9014


Byrd




 Local Storm Report 



09/01/2014 1054 PM

2 miles SSW of Manchester, St Louis County.

Hail e1.00 inch, reported by trained spotter.


            Big Bend at Sulphur Springs Road.




 Public Information Statement  Statement as of 6:10 PM CDT on September 1, 2014


... Safety rules for severe thunderstorms...

A Severe Thunderstorm Watch has been issued by the National
Weather Service. In the interest of public safety, the
following safety rules are provided. Public and commercial
broadcast stations serving the affected area are asked to
broadcast these safety measures frequently while the watch is
in effect.

A Severe Thunderstorm Watch means conditions are favorable for
the development of severe thunderstorms in and close to the
watch area. If you are in the watch area, keep up to date of
the latest weather information. These storms can develop
rapidly so there may be occasions when advance warning is not
possible.

A Severe Thunderstorm Warning means a severe thunderstorm has
been observed or indicated on radar. If you are in the path
or near the storm, take immediate actions to protect life and
property. Follow these safety rules:

(1) in open country, you should seek shelter and avoid trees
which can be targets for lightning. If there is no shelter,
go to a ditch or culvert but beware of rising water which can
cause flooding.

(2) when indoors, stay away from outside walls and windows
and go to an interior room on the lowest level. Avoid using
electrical appliances while the storm is nearby.

(3) in Mobile homes, you should leave and seek nearby safe
shelter.

(4) if swimming or on a boat, you should get to shore as
quickly as possible and find shelter.

A thunderstorm is considered severe when it contains one inch
or larger diameter size hail and/or wind gusts of 58 miles an
hour or greater. A severe thunderstorm can also produce deadly
lightning and very heavy rain which can lead to flash flooding.

Remember, with any severe thunderstorm there is always the
possibility of tornadoes.



Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: St. Ann, MO, St. Ann, MO

Updated: 10:57 PM CDT

Temperature: 67.8 °F Dew Point: 65 °F Humidity: 91% Wind: SSW at 1.7 mph Pressure: 29.89 in Hourly Precipitation: - Heat Index: - Graphs

Location: 1 Mile South of St. Louis Lambert Airport, Woodson Terrace, MO

Updated: 11:10 PM CDT

Temperature: 67.5 °F Dew Point: 66 °F Humidity: 95% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Maryland Heights, St Louis, MO

Updated: 11:00 PM CDT

Temperature: 68.6 °F Dew Point: 66 °F Humidity: 92% Wind: NW at 5.0 mph Pressure: 29.26 in Hourly Precipitation: 0.94 in Heat Index: - Graphs

Location: Graeser Acres, St. Louis, MO

Updated: 11:10 PM CDT

Temperature: 69.7 °F Dew Point: 64 °F Humidity: 84% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.69 in Heat Index: - Graphs

Location: Maryland Heights, MO

Updated: 11:06 PM CDT

Temperature: 68.3 °F Dew Point: 67 °F Humidity: 95% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Earth City, Earth City, MO

Updated: 11:59 PM EDT

Temperature: 68.4 °F Dew Point: 67 °F Humidity: 94% Wind: East at 2.0 mph Pressure: 29.87 in Hourly Precipitation: 0.61 in Heat Index: - Graphs

Location: Quiet Village, Creve Coeur, MO

Updated: 11:10 PM CDT

Temperature: 68.7 °F Dew Point: 67 °F Humidity: 95% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 1.16 in Heat Index: - Graphs

Location: Ross Ave, St. Louis, MO

Updated: 11:10 PM CDT

Temperature: 69.4 °F Dew Point: 64 °F Humidity: 83% Wind: North at 1.2 mph Pressure: 29.91 in Hourly Precipitation: 1.25 in Heat Index: - Graphs

Location: Whispering Hills, Creve Coeur, MO

Updated: 11:10 PM CDT

Temperature: 67.8 °F Dew Point: 66 °F Humidity: 95% Wind: NW at 2.0 mph Pressure: 29.87 in Hourly Precipitation: 1.56 in Heat Index: - Graphs

Location: Creve Coeur, St. Louis, MO

Updated: 11:10 PM CDT

Temperature: 67.6 °F Dew Point: 68 °F Humidity: 100% Wind: West at 1.6 mph Pressure: 29.50 in Hourly Precipitation: 1.74 in Heat Index: - Graphs

Location: Riverwood Place, Florissant, MO

Updated: 11:10 PM CDT

Temperature: 68.6 °F Dew Point: 67 °F Humidity: 96% Wind: SE at 1.0 mph Pressure: 29.91 in Hourly Precipitation: 1.27 in Heat Index: - Graphs

Location: De Smet Jesuit High School, Creve Coeur, MO

Updated: 11:05 PM CDT

Temperature: 67.5 °F Dew Point: 63 °F Humidity: 85% Wind: NNW at 7.0 mph Pressure: 29.88 in Hourly Precipitation: 0.91 in Heat Index: - Graphs

Location: Ladue, St. Louis, MO

Updated: 11:10 PM CDT

Temperature: 74.8 °F Dew Point: - Humidity: 79% Wind: North at - Pressure: 29.25 in Hourly Precipitation: - Heat Index: 75 °F Graphs

Location: Creve Coeur Park - Forest ReLeaf, St. Louis, MO

Updated: 11:03 PM CDT

Temperature: 67.8 °F Dew Point: 67 °F Humidity: 96% Wind: Calm Pressure: 29.44 in Hourly Precipitation: 1.26 in Heat Index: - Graphs

Location: Creve Coeur Airport, Maryland Heights, MO

Updated: 11:05 PM CDT

Temperature: 67.9 °F Dew Point: 67 °F Humidity: 96% Wind: South at 2.0 mph Pressure: 29.90 in Hourly Precipitation: 0.43 in Heat Index: - Graphs

Location: Historic Saint Charles, Saint Charles, MO

Updated: 11:10 PM CDT

Temperature: 68.1 °F Dew Point: 67 °F Humidity: 96% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Chesterfield (East), Chesterfield, MO

Updated: 11:10 PM CDT

Temperature: 68.2 °F Dew Point: 67 °F Humidity: 95% Wind: NNE at 1.0 mph Pressure: 29.89 in Hourly Precipitation: 0.85 in Heat Index: - Graphs

Location: Parkridge, Brentwood, MO

Updated: 11:10 PM CDT

Temperature: 69.8 °F Dew Point: - Humidity: - Wind: NW at 3.1 mph Pressure: 29.91 in Hourly Precipitation: 0.45 in Heat Index: - Graphs

Location: Talbridge, St. Charles, MO

Updated: 11:10 PM CDT

Temperature: 67.6 °F Dew Point: 66 °F Humidity: 96% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 1.61 in Heat Index: - Graphs

Location: Lindenwood, St. Charles, MO

Updated: 11:10 PM CDT

Temperature: 68.1 °F Dew Point: 67 °F Humidity: 97% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Jost Farm, Florissant, MO

Updated: 11:10 PM CDT

Temperature: 68.2 °F Dew Point: 62 °F Humidity: 81% Wind: West at 3.1 mph Pressure: 29.83 in Hourly Precipitation: 1.02 in Heat Index: - Graphs

Location: www.seedgeeks.com, Brentwood, MO

Updated: 11:00 PM CDT

Temperature: 71.4 °F Dew Point: 70 °F Humidity: 95% Wind: WNW at 4.7 mph Pressure: 29.91 in Hourly Precipitation: - Heat Index: - Graphs

Location: Fox Hill, Saint Charles, MO

Updated: 10:12 PM CDT

Temperature: 72.3 °F Dew Point: 67 °F Humidity: 83% Wind: NW at 9.6 mph Pressure: 29.35 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Forest Park, St. Louis, MO

Updated: 11:10 PM CDT

Temperature: 76.8 °F Dew Point: - Humidity: 76% Wind: North at - Pressure: 29.31 in Hourly Precipitation: 0.05 in Heat Index: 78 °F Graphs

Location: Danielle Downs, St. Peters, MO

Updated: 11:10 PM CDT

Temperature: 68.5 °F Dew Point: 68 °F Humidity: 99% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 1.49 in Heat Index: - Graphs

Location: Wilshire Valley, St. Charles, MO

Updated: 11:02 PM CDT

Temperature: 69.4 °F Dew Point: 63 °F Humidity: 80% Wind: ENE at 5.0 mph Pressure: 30.01 in Hourly Precipitation: 0.60 in Heat Index: - Graphs

Location: Webster Groves, Webster Groves, MO

Updated: 11:10 PM CDT

Temperature: 67.3 °F Dew Point: 67 °F Humidity: 99% Wind: NW at 11.0 mph Pressure: 29.98 in Hourly Precipitation: 0.43 in Heat Index: - Graphs

Location: Essex and Geyer, St. Louis, MO

Updated: 10:57 PM CDT

Temperature: 70.0 °F Dew Point: 66 °F Humidity: 86% Wind: West at 3.7 mph Pressure: 29.76 in Hourly Precipitation: - Heat Index: - Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 11:10 PM CDT

Temperature: 68.7 °F Dew Point: 67 °F Humidity: 94% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.80 in Heat Index: - Graphs

Location: Harvester, St. Charles, MO

Updated: 11:04 PM CDT

Temperature: 68.4 °F Dew Point: 67 °F Humidity: 96% Wind: ESE at 3.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: East Madison, Kirkwood, MO, Kirkwood, MO

Updated: 11:10 PM CDT

Temperature: 68.5 °F Dew Point: 66 °F Humidity: 92% Wind: NNE at 2.0 mph Pressure: 29.90 in Hourly Precipitation: 0.84 in Heat Index: - Graphs

Location: Crest Ave. Kirkwood MO, St. Louis, MO

Updated: 10:55 PM CDT

Temperature: 71.6 °F Dew Point: 68 °F Humidity: 88% Wind: WSW at 4.2 mph Pressure: 29.91 in Hourly Precipitation: - Heat Index: - Graphs

Location: West Drive, St. Peters, MO

Updated: 11:10 PM CDT

Temperature: 68.0 °F Dew Point: 66 °F Humidity: 93% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 1.66 in Heat Index: - Graphs

Location: Foxborough Estates, St. Charles, MO

Updated: 11:10 PM CDT

Temperature: 68.2 °F Dew Point: 67 °F Humidity: 96% Wind: ESE at 1.0 mph Pressure: 29.91 in Hourly Precipitation: 0.30 in Heat Index: - Graphs

Location: Shaw/Tower Grove, St. Louis, MO

Updated: 11:10 PM CDT

Temperature: 73.0 °F Dew Point: 67 °F Humidity: 80% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.28 in Heat Index: 73 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion...updated 
National Weather Service St Louis MO 
838 PM CDT Mon Sep 1 2014 


Update: 
issued at 835 PM CDT Mon Sep 1 2014 


In the process of pulling the Flash Flood Watch northward a couple 
of tiers of counties based on radar trends. Still believe that the 
heaviest rainfall threat will be shifting south with time, but 
current trends suggest that may not be fast enough to prevent some 
Hydro problems over the next few hours. However...did limit the 
flash Flood Advisory to just this evening in cou area as heaviest rains should drop 
south/east of their area by 05z. May be able to trim some other 
northern areas as well by then but will watch radar trends for 
this adjustment. 


Truett 


&& 


Short term: (through late tonight) 
issued at 310 PM CDT Mon Sep 1 2014 


Heavy rain threat is the primary forecast challenge for tonight. 
Another shortwave is moving east-southeast through the longwave 
pattern over the Great Plains. This shortwave will trigger a 
south-southwesterly low level jet to increase again this evening, 
aimed right at the low level baroclinic zone left over from last 
night's storms. With plenty of moisture in place over the area and 
a baroclinic zone that's parallel or nearly parallel to the mid 
level flow, expect that thunderstorms will form and train over parts 
of Missouri and Illinois this evening and tonight. All short range 
guidance shows a tremendous amount of moisture convergence on the 
nose of the low level jet tonight...generally along and south of the 
I-70 corridor. Think the axis of heaviest rain will actually be 
along and south of the I-44 corridor in Missouri and along and south 
of I-70 in Illinois, but I cannot rule out heavy rain a little 
further north either. Quantitative precipitation forecast forecast paints a swath of heavy rain 
along this axis between 1.5 and 2 inches. With the potential for 
locally higher amounts, and flash flood guidance running around 
2-2.5 inches per hour, will go ahead and issue a Flash Flood Watch 
for those areas. Further north across northeast Missouri and west 
central Illinois, there could be some widely scattered/isolated 
showers and thunderstorms, but I don't think these will train and 
cause any flooding issues. 


Carney 


Long term: (tuesday through next monday) 
issued at 340 PM CDT Mon Sep 1 2014 


(tuesday - wednesday) 


Flat zonal upper flow will remain in the wake of the strong 
shortwave expected to pull away by Tuesday morning, with the hot 
upper ridge that had given US our period of well above average temps 
lurking just to the south. The synoptic cold front will probably 
linger into the stl Metro area at the start of Tuesday, but its 
associated precipitation likely well out ahead of it by this time 
into southern MO and far southern Illinois. Any slowing down of the 
eastward progress of the shortwave though will favor some 
precipitation of some sort extending back close to the stl Metro 
area. 


The upper level pattern at this point is not very favorable for much 
more southward progress of the front and so this boundary is 
expected to stall somewhere in the southern County Warning Area Tuesday and into 
Tuesday night. The old frontal boundary will probably lose a lot of 
its moisture convergence strength Tuesday afternoon and evening and 
so only isolated convection is expected in the absence of a low 
level jet or upper level support. The low level jet that will help 
refire up a more organized system later on Tuesday night will 
probably begin well to the west of our region and not really reach 
our area until Wednesday if it holds. 


It is for this reason that Wednesday pops were tempered until we see 
a clearer signal for how this will evolve and develop. 


Above average temps expected thru this period but not hot enough to 
warrant any sort of heat headline. 


(Thursday - friday) 


Well above average temps are currently anticipated during this 
stretch, with Max temps in the lo-mid 90s. Peak heat index values 
are looking to be from 100-105 for many areas on Thursday and, 
depending on whether or not thunderstorms can get going along 
approaching cold front, may very well see these values again 
on Friday. 


Fortunately, it is now September and so these shots of heat should 
be relatively short-lived...with it all expected to come to an end 
once the front moves thru Friday night. Boosted pops to just below 
likely for Friday night. 


(Saturday - next monday) 


A well deserved cool period still in the offing in the wake of this 
front with a 1025mb high pressure to be the dominant influence 
during this period. Max temps may struggle to exit the 70s in many 
areas. 


Tes 


&& 


Aviation: (for the 18z tafs through 18z Tuesday afternoon) 
issued at 1238 PM CDT Mon Sep 1 2014 


Expect VFR flight conditions to prevail through much of the 
afternoon. Scattered light showers will continue through the early 
afternoon across parts of southeast Missouri. West to southwest 
wind will gust to around 24kts. Expecting thunderstorms to 
redevelop somewhere over west central or southwest Missouri later 
this afternoon and spread northeast into parts of central and 
eastern Missouri and southwest Illinois this evening. Storms will 
likely train along and south of the I-70/I-44 corridor tonight 
producing IFR conditions in heavy rain. Storms should move south 
and begin to dissipate between 08-12z. 


Specifics for kstl: 


VFR flight conditions are expected to prevail this afternoon at 
Lambert. Latest thoughts are that thunderstorms will develop over 
southwest/west central Missouri and spread east-northeast into 
eastern Missouri by early this evening. A prolonged period of 
thunderstorms with occasional heavy rain will likely impact the 
terminal during the mid-late evening. Storms should move south of 
the terminal between 06-11z; timing is uncertain at this time. 
After storms exit the stl Metro area, expect MVFR cigs to rise to 
VFR during the morning. 


Carney 


&& 


Lsx watches/warnings/advisories: 
MO...Flash Flood Watch until 7 am CDT Tuesday for Callaway MO-Cole MO- 
Crawford MO-Franklin MO-Gasconade MO-Iron MO-Jefferson MO- 
Lincoln MO-Madison MO-Moniteau MO-Montgomery MO-Osage MO- 
Pike MO-Reynolds MO-St. Charles MO-St. Francois MO-St. 
Louis city MO-St. Louis MO-Ste. Genevieve MO-Warren MO- 
Washington MO. 


Flash Flood Watch until midnight CDT tonight for Boone MO. 


Illinois...Flash Flood Watch until 7 am CDT Tuesday for Bond Illinois-Calhoun Illinois- 
Clinton Illinois-Fayette Illinois-Greene Illinois-Jersey Illinois-Macoupin Illinois- 
Madison Illinois-Marion Illinois-Monroe Illinois-Montgomery Illinois-Randolph Illinois- 
St. Clair Illinois-Washington Illinois. 


&& 


$$ 


Weather forecast office lsx 












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