Saint Peters, Missouri Weather Conditions

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Current Conditions

  • 88°
  • Scattered Clouds
  • Wind: WSW 6 mph
  • Humidity: 61%
  • Visibility: 10.0 miles
  • Dew Point: 73°
  • Pressure: 29.94 in. 0
  • Heat Index: 96

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Next 12 Hours

1  pm
4  pm
7  pm
10  pm
1  am
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
Partly Cloudy
Partly Cloudy
Mostly Cloudy
Mostly Cloudy
Partly Cloudy
Partly Cloudy
88°
93°
86°
79°
75°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Wednesday
  • Chance of a Thunderstorm
  • High: 93 °
  • Low: 73 °
  • Chance of a Thunderstorm
  • Thursday
  • Partly Cloudy
  • High: 97 °
  • Low: 73 °
  • Partly Cloudy
  • Friday
  • Partly Cloudy
  • High: 99 °
  • Low: 72 °
  • Partly Cloudy
  • Saturday
  • Partly Cloudy
  • High: 93 °
  • Low: 73 °
  • Partly Cloudy
  • Sunday
  • Partly Cloudy
  • High: 102 °
  • Low: 70 °
  • Partly Cloudy

Forecast for Saint Peters, Missouri

Updated: 10:00 AM CDT on August 19, 2014

Heat advisory in effect until 7 PM CDT Sunday...
  • Wednesday

    Partly cloudy with a chance of a thunderstorm and a chance of rain in the afternoon. High of 93F with a heat index of 100F. Winds from the SW at 5 to 10 mph. Chance of rain 20%.

  • Wednesday Night

    Partly cloudy in the evening, then overcast. Low of 73F. Winds from the SW at 5 to 10 mph.

  • Thursday

    Partly cloudy. High of 97F with a heat index of 104F. Winds from the SW at 10 to 15 mph.

  • Thursday Night

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

  • Friday

    Partly cloudy. High of 99F. Winds from the SW at 5 to 10 mph.

  • Friday Night

    Partly cloudy. Low of 72F. Winds from the SW at 5 to 10 mph.

  • Saturday

    Partly cloudy. High of 93F. Winds from the WSW at 5 to 10 mph.

  • Saturday Night

    Clear. Low of 73F. Winds from the SW at 5 to 10 mph.

  • Sunday

    Partly cloudy. High of 102F. Winds from the WSW at 5 to 10 mph.

  • Sunday Night

    Partly cloudy. Low of 70F. Winds less than 5 mph.

  • Monday

    Partly cloudy with a chance of a thunderstorm. High of 86F. Winds less than 5 mph. Chance of rain 40%.

  • Monday Night

    Partly cloudy. Low of 72F. Winds from the NNE at 5 to 10 mph shifting to the East after midnight.

  • Tuesday

    Partly cloudy. High of 90F. Winds from the SW at 5 to 10 mph.

  • Tuesday Night

    Clear. Low of 75F. Winds less than 5 mph.

  • Wednesday

    Partly cloudy. High of 81F. Winds less than 5 mph.

  • Wednesday Night

    Clear. Fog overnight. Low of 63F. Winds less than 5 mph.

  • Thursday

    Partly cloudy with a chance of a thunderstorm. High of 81F. Winds less than 5 mph. Chance of rain 40%.

  • Thursday Night

    Mostly cloudy with a chance of a thunderstorm. Fog overnight. Low of 63F. Winds less than 5 mph. Chance of rain 40%.

  • Friday

    Mostly cloudy. High of 79F. Winds less than 5 mph.

  • Friday Night

    Clear. Low of 63F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Heat Advisory  Statement as of 3:10 am CDT on August 20, 2014


... Heat advisory in effect from 1 PM this afternoon to 7 PM CDT
Sunday...

The National Weather Service in St Louis has issued a heat
advisory... which is in effect from 1 PM this afternoon to 7 PM
CDT Sunday.

* Timing... dangerous levels of heat and humidity will begin on
Wednesday afternoon... and will continue for the rest of the week
and into the upcoming weekend.

* Heat index values... up to 105 due to temperatures in the mid
90s... and dewpoints around 70.

* Impacts... the combination of hot temperatures and high humidity
will likely lead to an increased risk of heat- related stress
and illness. The very Young... the elderly... those without air
conditioning... and those participating in strenuous outdoor
activities will be the most susceptible. Also... car interiors
can reach lethal temperatures in a matter of minutes. Beat the
heat... check the backseat! Never leave children or pets
unattended in a vehicle... not even for a minute.

Precautionary/preparedness actions...

Take extra precautions if you work or spend time outside. When
possible... reschedule strenuous activities to the early morning
or evening. Know the signs and symptoms of heat exhaustion and
heat stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work... the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency. Call 9-1-1 immediately.






Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: St. Peters, St. Peters, MO

Updated: 1:31 PM CDT

Temperature: 89.2 °F Dew Point: 76 °F Humidity: 65% Wind: North at 2.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

Location: O'fallon / St. Peters, St. Peters, MO

Updated: 1:31 PM CDT

Temperature: 88.9 °F Dew Point: 81 °F Humidity: 77% Wind: Calm Pressure: 30.14 in Hourly Precipitation: 0.00 in Heat Index: 107 °F Graphs

Location: West Drive, St. Peters, MO

Updated: 1:31 PM CDT

Temperature: 88.2 °F Dew Point: 76 °F Humidity: 66% Wind: ENE at 1.0 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Pennial Park, O'Fallon, MO

Updated: 1:30 PM CDT

Temperature: 90.6 °F Dew Point: 77 °F Humidity: 65% Wind: NW at 6.0 mph Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: Foxborough Estates, St. Charles, MO

Updated: 1:31 PM CDT

Temperature: 88.9 °F Dew Point: 75 °F Humidity: 64% Wind: NNE at 1.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: COTTLEVILLE/HARVESTER, St. Charles, MO

Updated: 1:31 PM CDT

Temperature: 90.1 °F Dew Point: 74 °F Humidity: 60% Wind: SW at 2.0 mph Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Piggy's BBQ, OFallon, MO

Updated: 1:30 PM CDT

Temperature: 89.5 °F Dew Point: 75 °F Humidity: 62% Wind: WNW at 1.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Downtown O'Fallon, O'Fallon, MO

Updated: 1:31 PM CDT

Temperature: 89.0 °F Dew Point: 73 °F Humidity: 60% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 97 °F Graphs

Location: Ofallon Civic Park, Ofallon, MO

Updated: 1:30 PM CDT

Temperature: 88.6 °F Dew Point: 77 °F Humidity: 68% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

Location: Wilshire Valley, St. Charles, MO

Updated: 1:17 PM CDT

Temperature: 87.3 °F Dew Point: 65 °F Humidity: 48% Wind: SW at 3.0 mph Pressure: 30.05 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 1:31 PM CDT

Temperature: 87.9 °F Dew Point: 74 °F Humidity: 64% Wind: NNE at 2.3 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 97 °F Graphs

Location: Harvester, St. Charles, MO

Updated: 1:20 PM CDT

Temperature: 90.7 °F Dew Point: 78 °F Humidity: 66% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 105 °F Graphs

Location: Hyland Green, O'Fallon, MO

Updated: 1:31 PM CDT

Temperature: 88.0 °F Dew Point: 76 °F Humidity: 68% Wind: Calm Pressure: 29.55 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Royal Oaks, O'Fallon, MO

Updated: 1:31 PM CDT

Temperature: 88.0 °F Dew Point: 76 °F Humidity: 67% Wind: WNW at 3.0 mph Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Talbridge, St. Charles, MO

Updated: 1:30 PM CDT

Temperature: 88.9 °F Dew Point: 74 °F Humidity: 61% Wind: East at 1.1 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: Austin Ridge, Saint Charles, MO

Updated: 1:21 PM CDT

Temperature: 89.7 °F Dew Point: 78 °F Humidity: 68% Wind: South at 1.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: The Boardwalk at WingHaven, OFallon, MO

Updated: 1:24 PM CDT

Temperature: 88.9 °F Dew Point: 76 °F Humidity: 65% Wind: SSE at 2.0 mph Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Dardenne Prairie, Dardenne Prairie, MO

Updated: 1:29 PM CDT

Temperature: 87.7 °F Dew Point: 74 °F Humidity: 64% Wind: Calm Pressure: 29.67 in Hourly Precipitation: 0.00 in Heat Index: 96 °F Graphs

Location: Lindenwood, St. Charles, MO

Updated: 1:30 PM CDT

Temperature: 84.8 °F Dew Point: 76 °F Humidity: 74% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: 94 °F Graphs

Location: Ridgepointe-Meadowbrook, Lake Saint Louis, MO

Updated: 1:30 PM CDT

Temperature: 88.2 °F Dew Point: 77 °F Humidity: 70% Wind: NE at 2.7 mph Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

Location: Historic Saint Charles, Saint Charles, MO

Updated: 1:30 PM CDT

Temperature: 88.3 °F Dew Point: 76 °F Humidity: 67% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Locksley Manor, Lake Saint Louis, MO

Updated: 1:31 PM CDT

Temperature: 88.2 °F Dew Point: 74 °F Humidity: 64% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: St. Paul (SJC), OFallon, MO

Updated: 1:31 PM CDT

Temperature: 87.7 °F Dew Point: 77 °F Humidity: 70% Wind: WNW at 1.0 mph Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Creve Coeur Airport, Maryland Heights, MO

Updated: 1:30 PM CDT

Temperature: 90.8 °F Dew Point: 77 °F Humidity: 64% Wind: South at 1.0 mph Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: 104 °F Graphs

Location: Earth City, Earth City, MO

Updated: 2:21 PM EDT

Temperature: 89.9 °F Dew Point: 75 °F Humidity: 61% Wind: WSW at 3.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 100 °F Graphs

Location: Crimson Oaks, Lake Saint Louis, MO

Updated: 1:29 PM CDT

Temperature: 93.0 °F Dew Point: 76 °F Humidity: 58% Wind: North at 2.3 mph Pressure: 29.94 in Hourly Precipitation: - Heat Index: 106 °F Graphs

Location: Chesterfield (East), Chesterfield, MO

Updated: 1:31 PM CDT

Temperature: 89.7 °F Dew Point: 77 °F Humidity: 67% Wind: East at 1.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: 103 °F Graphs

Location: Avondale, Wentzville, MO

Updated: 1:18 PM CDT

Temperature: 88.4 °F Dew Point: 78 °F Humidity: 70% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 101 °F Graphs

Location: Maryland Heights, MO

Updated: 1:26 PM CDT

Temperature: 86.3 °F Dew Point: 77 °F Humidity: 74% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: Whispering Hills, Creve Coeur, MO

Updated: 1:31 PM CDT

Temperature: 88.2 °F Dew Point: 76 °F Humidity: 67% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

Location: Ross Ave, St. Louis, MO

Updated: 1:31 PM CDT

Temperature: 89.1 °F Dew Point: 75 °F Humidity: 63% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 99 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion...updated aviation 
National Weather Service St Louis MO 
1249 PM CDT Wed Aug 20 2014 


Update: 
issued at 1119 am CDT Wed Aug 20 2014 


Clouds and precip blanketing the eastern portion of the County warning forecast area have 
made for a challenging temperature forecast this morning. Have 
updated to go cooler from around Quincy down southeast to 
Litchfield/Salem areas. Heat advisory across Greene, Jersey, 
Macoupin, and perhaps Bond and Marion counties will likely be a 
bust today. However, hate to cancel the advisory in these areas 
given the possibility that we could still clear out and heat up 
significantly this afternoon. Additionally, the advisory still 
looks pretty good for Thursday through Sunday in those areas. Will 
just hang onto it for the time being. Short range guidance 
continues to hint at some isolated storms bubbling up this 
afternoon due to diurnal heating. Outflow boundaries from this 
morning's storms may provide enough focus to allow these isolated 
storms to form, so will also hang on to slight chance pops. 


Carney 


&& 


Short term: (through tonight) 
issued at 240 am CDT Wed Aug 20 2014 


Main focus thru the period will be pops, which will influence 
temps today and therefore, also headlines. 


There is still some uncertainty regarding heat headlines thru the 
weekend, but will go ahead and issue a heat advisory for portions 
of central and ern MO and SW Illinois. This expansion is due to expected 
heat index values of 100+ for at least 4 days. However, values of 
105+ degrees may be possible across the adv area, especially thurs 
and Fri. This adv may need to be expanded to include counties not 
currently in the adv. However, since criteria is not expected to 
be reached today, will handle that area tomorrow. 


Dewpoints are the main question as portions of central and southeast MO 
have been mixing out well the past few days. These are the areas 
that have seen the least rainfall lately and generally mix out 
well during the day. Have therefore kept the ern Ozarks out of the 
adv for now. 


As for pops...the hrrr, local 4km WRF and the 4km NSSL WRF seem 
to be handling the current convection fairly well. Have therefore 
tailored pops for the remainder of today and into tonight twd 
those solns. In general, ongoing storms over Iowa and far NE MO shud 
move sewd impacting mainly the nrn portions of the County Warning Area this 
morning. Mdls suggest storms developing this afternoon over the 
ern Ozarks or along the MS rvr, but these shud remain isod. For 
tonight, storms shud remain focused along the fnt and where 850mb 
convergence is greatest. Believe the best chances will remain NE 
of the cwa, but have kept slight chance pops along the nern 
counties due to uncertainty. 


A lot of questions remain regarding temps today due to possible 
convection. However, have trended above the cooler MOS, but stayed 
below the warmer MOS. Overall, this verified fairly well 
yesterday. Temps for tonight are a little more complex as mixing 
shud be greater across central MO. However, have trended above the 
warmer MOS due to swly winds thru the night. 


Long term: (tonight through tuesday) 
issued at 338 am CDT Wed Aug 20 2014 


Focus thru the period will be temps and the ongoing heat 
headlines. 


Much of the questions regarding dewpoints and headlines continues 
thru the weekend as mentioned above and will therefore not dwell 
on the uncertainties here. Dewpoints across the ern Ozarks and 
perhaps into central MO are expected to mix out during the 
afternoon. The rainfall over the past few days shud help drive up 
dewpoints across NE MO and much of SW Illinois. Overall not much change 
to the prev forecast as it appears to be on track. 


The Gem continues to be an outlier especially beyond Sat and have 
therefore trended twd the other guidance. The local WRF and to 
some degree the NAM also trend away from a GFS/European model (ecmwf) compromise 
for Fri and beyond and have therefore trended away from these 
solns as well. 


The main changes from yesterday are how this heat event comes to 
an end. The GFS/European model (ecmwf) now suggest the upper ridge, while weaker, 
will remain in place into tues. However, both mdls prog cooler 
850mb and 700mb temps which shud still result in cooler temps as 
well as an increase in precip chances. These precip chances will 
be mainly afternoon pulse thunderstorms and rain as a S/W approaches the region from 
the southeast. 


&& 


Aviation: (for the 18z tafs through 18z Thursday afternoon) 
issued at 1239 PM CDT Wed Aug 20 2014 


Tricky aviation forecast this afternoon...primarily along and east 
of the Mississippi. Outflow boundary from this morning's 
thunderstorms over Illinois is approaching the stl Metro area at 
this time. Wind will shift to a northeasterly direction as the 
boundary passes. This will cause a runway swap for the Metro 
terminals. Expect outflow boundary to stall over eastern Missouri 
at some point, tho exactly where is uncertain. Next problem will 
be the probability that thunderstorms will form along the boundary 
this afternoon. At this time, expect there will be isolated storms 
along the boundary, however am not confident enough there will be 
great enough coverage to include in tafs at this time. Any storms 
that do form should dissipate within an hour or two of sunset this 
evening. There will be another chance for storms overnight 
tonight, primarily over central Illinois as the low level jet 
pushes more warm/moist air into the region. Expect VFR flight 
conditions through the period outside of thunderstorms. 


Specifics for kstl: 


Carney 


&& 


Lsx watches/warnings/advisories: 
MO...heat advisory until 7 PM CDT Sunday for Audrain MO-Boone MO- 
Callaway MO-Cole MO-Franklin MO-Gasconade MO-Jefferson MO- 
Lincoln MO-Madison MO-Moniteau MO-Montgomery MO-Osage MO- 
St. Charles MO-St. Francois MO-Ste. Genevieve MO-Warren MO. 


Excessive heat warning until 7 PM CDT Sunday for St. Louis city 
MO-St. Louis MO. 


Illinois...heat advisory until 7 PM CDT Sunday for Bond Illinois-Calhoun Illinois- 
Clinton Illinois-Greene Illinois-Jersey Illinois-Macoupin Illinois-Marion Illinois-Monroe 
Illinois-Randolph Illinois-Washington Illinois. 


Excessive heat warning until 7 PM CDT Sunday for Madison IL-St. 
Clair Illinois. 


&& 


$$ 


Weather forecast office lsx 












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