Saint Peters, Missouri Weather Conditions

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Winter Storm Warning View All Alerts

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Current Conditions

  • 27°
  • Light Snow
  • Wind: WNW 4 mph
  • Humidity: 92%
  • Visibility: 0.8 miles
  • Dew Point: 25°
  • Pressure: 30.42 in. +
  • Heat Index: 23

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Click a section below for more information.

Next 12 Hours

9  am
12  pm
3  pm
6  pm
9  pm
Ice Pellets
Ice Pellets
Ice Pellets
Ice Pellets
Ice Pellets
Ice Pellets
Overcast
Overcast
Mostly Cloudy
Mostly Cloudy
28°
30°
32°
32°
28°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Sunday
  • Ice Pellets
  • High: 36 °
  • Low: 21 °
  • Ice Pellets
  • Monday
  • Chance of Snow
  • High: 43 °
  • Low: 28 °
  • Chance of Snow
  • Tuesday
  • Thunderstorm
  • High: 52 °
  • Low: 18 °
  • T-Storms
  • Wednesday
  • Partly Cloudy
  • High: 34 °
  • Low: 12 °
  • Partly Cloudy
  • Thursday
  • Clear
  • High: 32 °
  • Low: 19 °
  • Clear

Forecast for Saint Peters, Missouri

Updated: 9:00 AM CST on March 01, 2015

Winter Storm Warning in effect until 6 PM CST this evening...
  • Sunday

    Overcast with ice pellets and snow, then ice pellets in the afternoon. High of 36F. Winds less than 5 mph. Chance of precipitation 70% .

  • Sunday Night

    Overcast in the evening, then mostly cloudy. Low of 21F. Winds from the NW at 5 to 10 mph.

  • Monday

    Partly cloudy. High of 43F. Winds from the NNE at 5 to 10 mph shifting to the East in the afternoon. Chance of snow 20%.

  • Monday Night

    Mostly cloudy with a ice pellets and a chance of snow in the evening, then overcast with snow. Low of 28F with a windchill as low as 19F. Winds from the SE at 5 to 10 mph. Chance of precipitation 60% .

  • Tuesday

    Overcast with thunderstorms and rain showers. High of 52F. Winds from the SSW at 10 to 15 mph. Chance of rain 80% with rainfall amounts near 0.3 in. possible.

  • Tuesday Night

    Overcast with a chance of snow. Low of 18F with a windchill as low as 7F. Breezy. Winds from the NW at 15 to 20 mph.

  • Wednesday

    Overcast. High of 34F with a windchill as low as 3F. Breezy. Winds from the NNW at 15 to 20 mph.

  • Wednesday Night

    Partly cloudy. Low of 12F. Winds from the North at 5 to 15 mph.

  • Thursday

    Clear. High of 32F. Winds from the NNW at 5 to 10 mph.

  • Thursday Night

    Clear. Low of 19F with a windchill as low as 10F. Winds from the SSE at 10 to 15 mph.

  • Friday

    Clear. High of 52F. Breezy. Winds from the SSW at 15 to 20 mph.

  • Friday Night

    Clear. Low of 30F. Winds from the SSW at 10 to 15 mph.

  • Saturday

    Clear. High of 50F. Winds from the WSW at 10 to 15 mph shifting to the NW in the afternoon.

  • Saturday Night

    Clear. Low of 34F. Winds from the NNW at 5 to 10 mph.

  • Sunday

    Clear. High of 50F. Winds from the SW at 5 to 10 mph.

  • Sunday Night

    Clear. Fog overnight. Low of 30F. Winds from the SSW at 5 to 10 mph.

  • Monday

    Clear. High of 46F. Winds less than 5 mph.

  • Monday Night

    Clear. Low of 28F. Winds less than 5 mph.

  • Tuesday

    Clear. High of 50F. Winds less than 5 mph.

  • Tuesday Night

    Clear. Low of 30F. Winds less than 5 mph.

  • Wednesday

    Clear. High of 50F. Winds less than 5 mph.

  • Wednesday Night

    Clear. Low of 30F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Winter Storm Warning  Statement as of 4:25 am CST on March 1, 2015


... Winter Storm Warning remains in effect until 6 PM CST this
evening...

* timing... snow will gradually diminish today... possibly mixing
with sleet or freezing drizzle for a brief period.

* Accumulations... 5 to 8 inches of snow.

* Winds... west 5 mph or less.

* Impacts... the wintry precipitation will result in hazardous
travel conditions... especially on bridges... overpasses... and
untreated roads. Parking lots and sidewalks will become
slippery as well.

Precautionary/preparedness actions...

A Winter Storm Warning means that 6 inches or more of snow is
expected. The accumulation of snow will make travel extremely
difficult... if not impossible. If travel is necessary... make sure
to exercise caution. Begin your travel with a tank full of
gas... and carry a winter storm kit which includes a shovel...
flashlight... cellphone... and blankets of extra warm clothing.






 Local Storm Report 



03/01/2015 0834 am

St. Peters, St Charles County.

Snow m3.5 inch, reported by trained spotter.


            Intersection of I-364 and jungs station Rd.





03/01/2015 0834 am

St. Peters, St Charles County.

Snow m3.5 inch, reported by trained spotter.


            Intersection of I-364 and jungs station Rd.





03/01/2015 0653 am

Wentzville, St Charles County.

Snow m3.8 inch, reported by trained spotter.






03/01/2015 0653 am

Wentzville, St Charles County.

Snow m3.8 inch, reported by trained spotter.






03/01/2015 0639 am

St. Paul, St Charles County.

Snow e5.0 inch, reported by trained spotter.






03/01/2015 0639 am

St. Paul, St Charles County.

Snow e5.0 inch, reported by trained spotter.






03/01/2015 0639 am

St. Paul, St Charles County.

Snow e5.0 inch, reported by trained spotter.






03/01/2015 0222 am

Weldon Spring, St Charles County.

Snow m4.0 inch, reported by NWS employee.


            4.0 inches measured at the NWS office in Weldon Spring.
            Still snowing lightly.





03/01/2015 0222 am

Weldon Spring, St Charles County.

Snow m4.0 inch, reported by NWS employee.


            4.0 inches measured at the NWS office in Weldon Spring.
            Still snowing lightly.





02/28/2015 1140 PM

Weldon Spring, St Charles County.

Snow m4.0 inch, reported by official NWS obs.


            WFO lsx





02/28/2015 1140 PM

Weldon Spring, St Charles County.

Snow m4.0 inch, reported by official NWS obs.


            WFO lsx





02/28/2015 1005 PM

Weldon Spring, St Charles County.

Snow m3.4 inch, reported by official NWS obs.






02/28/2015 1005 PM

Weldon Spring, St Charles County.

Snow m3.4 inch, reported by official NWS obs.






02/28/2015 0933 PM

Cottleville, St Charles County.

Snow m2.8 inch, reported by NWS employee.


            Second Cottleville observing site.





02/28/2015 0933 PM

Cottleville, St Charles County.

Snow m2.8 inch, reported by NWS employee.


            Second Cottleville observing site.





02/28/2015 0906 PM

O'Fallon, St Charles County.

Snow m3.0 inch, reported by Fire Dept/Rescue.


            Near Bryan Road and I-70.





02/28/2015 0911 PM

O'Fallon, St Charles County.

Snow m3.0 inch, reported by trained spotter.


            Near the intersection of Highway 40 and N.





02/28/2015 0911 PM

O'Fallon, St Charles County.

Snow m3.0 inch, reported by trained spotter.


            Near the intersection of Highway 40 and N.





02/28/2015 0900 PM

Cottleville, St Charles County.

Snow m3.0 inch, reported by NWS employee.






02/28/2015 0900 PM

Cottleville, St Charles County.

Snow m3.0 inch, reported by NWS employee.






02/28/2015 0906 PM

O'Fallon, St Charles County.

Snow m3.0 inch, reported by Fire Dept/Rescue.


            Near Bryan Road and I-70.





02/28/2015 0906 PM

O'Fallon, St Charles County.

Snow m3.0 inch, reported by Fire Dept/Rescue.


            Near Bryan Road and I-70.





02/28/2015 0829 PM

Wentzville, St Charles County.

Snow m3.0 inch, reported by public.






02/28/2015 0829 PM

Wentzville, St Charles County.

Snow m3.0 inch, reported by public.






02/28/2015 0629 PM

St. Peters, St Charles County.

Snow m1.5 inch, reported by trained spotter.






02/28/2015 0629 PM

St. Peters, St Charles County.

Snow m1.5 inch, reported by trained spotter.






02/28/2015 0629 PM

St. Peters, St Charles County.

Snow m1.5 inch, reported by trained spotter.






02/28/2015 0532 PM

St. Charles, St Charles County.

Snow m1.2 inch, reported by trained spotter.






02/28/2015 0532 PM

St. Charles, St Charles County.

Snow m1.2 inch, reported by trained spotter.






02/28/2015 0420 PM

O'Fallon, St Charles County.

Snow m1.1 inch, reported by trained spotter.






02/28/2015 0420 PM

O'Fallon, St Charles County.

Snow m1.1 inch, reported by trained spotter.






02/28/2015 0420 PM

O'Fallon, St Charles County.

Snow m1.1 inch, reported by trained spotter.






02/28/2015 0406 PM

Weldon Spring, St Charles County.

Snow m1.0 inch, reported by NWS employee.


            NWS lsx





02/28/2015 0406 PM

Weldon Spring, St Charles County.

Snow m1.0 inch, reported by NWS employee.


            NWS lsx





02/28/2015 0322 PM

Weldon Spring, St Charles County.

Snow m0.7 inch, reported by NWS employee.


            NWS lsx





02/28/2015 0322 PM

Weldon Spring, St Charles County.

Snow m0.7 inch, reported by NWS employee.


            NWS lsx





02/28/2015 0322 PM

Weldon Spring, St Charles County.

Snow m0.7 inch, reported by NWS employee.


            NWS lsx




Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: St. Peters, St. Peters, MO

Updated: 9:03 AM CST

Temperature: 27.9 °F Dew Point: 26 °F Humidity: 92% Wind: Calm Pressure: 30.40 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Saint Peters Hills, Saint Peters, MO

Updated: 9:02 AM CST

Temperature: 27.7 °F Dew Point: 22 °F Humidity: 79% Wind: Calm Pressure: 30.21 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Hunters Valley, Saint Peters, MO

Updated: 8:55 AM CST

Temperature: 28.2 °F Dew Point: 27 °F Humidity: 95% Wind: Calm Pressure: 30.38 in Hourly Precipitation: - Windchill: 28 °F Graphs

Location: Park Charles South, Saint Peters, MO

Updated: 8:46 AM CST

Temperature: 28.8 °F Dew Point: 24 °F Humidity: 86% Wind: North at - Pressure: 30.45 in Hourly Precipitation: - Windchill: 29 °F Graphs

Location: Country Crossing - Birdie Hills and Treeshadow, St. Peters, MO

Updated: 8:53 AM CST

Temperature: 29.8 °F Dew Point: 28 °F Humidity: 94% Wind: Calm Pressure: 30.24 in Hourly Precipitation: - Windchill: 30 °F Graphs

Location: Alpine Ridge, OFallon, MO

Updated: 9:03 AM CST

Temperature: 29.5 °F Dew Point: 24 °F Humidity: 81% Wind: Calm Pressure: 30.35 in Hourly Precipitation: 0.00 in Windchill: 30 °F Graphs

Location: Harmony Ridge, Cottleville, MO

Updated: 8:48 AM CST

Temperature: 27.5 °F Dew Point: 26 °F Humidity: 94% Wind: Calm Pressure: 30.28 in Hourly Precipitation: - Windchill: 28 °F Graphs

Location: manors of orchard glen, St. Peters, MO

Updated: 9:03 AM CST

Temperature: 27.5 °F Dew Point: 25 °F Humidity: 89% Wind: West at 1.3 mph Pressure: 30.40 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: McClay Trails, Saint Charles, MO

Updated: 8:58 AM CST

Temperature: 28.6 °F Dew Point: 27 °F Humidity: 92% Wind: Calm Pressure: 30.15 in Hourly Precipitation: - Windchill: 29 °F Graphs

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

Updated: 9:03 AM CST

Temperature: 27.9 °F Dew Point: 26 °F Humidity: 93% Wind: Calm Pressure: 30.38 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Public Works Department Building, OFallon, MO

Updated: 9:00 AM CST

Temperature: 28.6 °F Dew Point: 27 °F Humidity: 92% Wind: Calm Pressure: 30.41 in Hourly Precipitation: 0.00 in Windchill: 29 °F Graphs

Location: West Drive, St. Peters, MO

Updated: 9:03 AM CST

Temperature: 27.3 °F Dew Point: 26 °F Humidity: 92% Wind: Calm Pressure: 30.46 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

Location: Pennial Park, O'Fallon, MO

Updated: 9:00 AM CST

Temperature: 29.3 °F Dew Point: 26 °F Humidity: 87% Wind: ESE at 2.0 mph Pressure: 30.32 in Hourly Precipitation: 0.00 in Windchill: 29 °F Graphs

Location: Foxborough Estates, St. Charles, MO

Updated: 9:03 AM CST

Temperature: 27.2 °F Dew Point: 26 °F Humidity: 94% Wind: NW at 1.0 mph Pressure: 30.43 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

Location: COTTLEVILLE/HARVESTER, St. Charles, MO

Updated: 9:03 AM CST

Temperature: 28.2 °F Dew Point: 26 °F Humidity: 92% Wind: Calm Pressure: 30.31 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Ofallon Civic Park, Ofallon, MO

Updated: 9:03 AM CST

Temperature: 26.9 °F Dew Point: 25 °F Humidity: 94% Wind: Calm Pressure: 30.45 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

Location: Ridgetop Estates, OFallon, MO

Updated: 9:01 AM CST

Temperature: 28.8 °F Dew Point: 26 °F Humidity: 91% Wind: Calm Pressure: 30.46 in Hourly Precipitation: - Windchill: 29 °F Graphs

Location: Wilshire Valley, St. Charles, MO

Updated: 9:01 AM CST

Temperature: 27.5 °F Dew Point: 20 °F Humidity: 72% Wind: Calm Pressure: 30.45 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Saint Charles Hills, Saint Charles, MO

Updated: 9:03 AM CST

Temperature: 29.5 °F Dew Point: 25 °F Humidity: 83% Wind: Calm Pressure: 30.40 in Hourly Precipitation: 0.00 in Windchill: 30 °F Graphs

Location: Windwood,Nic S., St. Peters, MO

Updated: 8:52 AM CST

Temperature: 28.2 °F Dew Point: 28 °F Humidity: 97% Wind: Calm Pressure: 30.11 in Hourly Precipitation: - Windchill: 28 °F Graphs

Location: Harvester, St. Charles, MO

Updated: 8:49 AM CST

Temperature: 28.5 °F Dew Point: 27 °F Humidity: 92% Wind: Calm Pressure: 30.41 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: C. Verripslaantje, Saint Charles, MO

Updated: 9:01 AM CST

Temperature: 27.3 °F Dew Point: 23 °F Humidity: 84% Wind: North at - Pressure: 30.29 in Hourly Precipitation: - Windchill: 27 °F Graphs

Location: Magnolia, OFallon, MO

Updated: 8:55 AM CST

Temperature: 29.3 °F Dew Point: 27 °F Humidity: 90% Wind: Calm Pressure: 30.06 in Hourly Precipitation: - Windchill: 29 °F Graphs

Location: Twin Chimneys, O'Fallon, MO

Updated: 9:00 AM CST

Temperature: 27.0 °F Dew Point: 26 °F Humidity: 94% Wind: Calm Pressure: 30.32 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

Location: Huntington Downs, Saint Charles, MO

Updated: 9:00 AM CST

Temperature: 28.9 °F Dew Point: 24 °F Humidity: 83% Wind: North at - Pressure: 30.39 in Hourly Precipitation: 0.00 in Windchill: 29 °F Graphs

Location: Royal Oaks, O'Fallon, MO

Updated: 9:03 AM CST

Temperature: 25.9 °F Dew Point: 24 °F Humidity: 94% Wind: ESE at 3.0 mph Pressure: 30.43 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: Little Oaks Drive, O'Fallon, MO

Updated: 9:00 AM CST

Temperature: 29.5 °F Dew Point: 26 °F Humidity: 86% Wind: North at - Pressure: 30.45 in Hourly Precipitation: 0.00 in Windchill: 30 °F Graphs

Location: Talbridge, St. Charles, MO

Updated: 9:03 AM CST

Temperature: 28.0 °F Dew Point: 26 °F Humidity: 92% Wind: Calm Pressure: 30.33 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Austin Ridge, Saint Charles, MO

Updated: 8:50 AM CST

Temperature: 27.7 °F Dew Point: 26 °F Humidity: 94% Wind: Calm Pressure: 30.39 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: The Boardwalk at WingHaven, OFallon, MO

Updated: 9:03 AM CST

Temperature: 27.3 °F Dew Point: 26 °F Humidity: 94% Wind: WNW at 2.0 mph Pressure: 30.41 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

Location: Dardenne Prairie, Dardenne Prairie, MO

Updated: 9:00 AM CST

Temperature: 28.4 °F Dew Point: 24 °F Humidity: 82% Wind: Calm Pressure: 30.09 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Lindenwood, St. Charles, MO

Updated: 9:02 AM CST

Temperature: 28.1 °F Dew Point: 26 °F Humidity: 93% Wind: Calm Pressure: 30.41 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Doris Avenue, O'Fallon, MO

Updated: 9:01 AM CST

Temperature: 32.0 °F Dew Point: 26 °F Humidity: 77% Wind: North at - Pressure: 30.48 in Hourly Precipitation: - Windchill: 32 °F Graphs

Location: Ridgepointe-Meadowbrook, Lake Saint Louis, MO

Updated: 9:03 AM CST

Temperature: 30.6 °F Dew Point: 28 °F Humidity: 88% Wind: Calm Pressure: 30.42 in Hourly Precipitation: 0.00 in Windchill: 31 °F Graphs

Location: Locksley Manor, Lake Saint Louis, MO

Updated: 9:03 AM CST

Temperature: 28.0 °F Dew Point: 22 °F Humidity: 79% Wind: Calm Pressure: 30.94 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: Fox Hill, Saint Charles, MO

Updated: 9:03 AM CST

Temperature: 27.5 °F Dew Point: 25 °F Humidity: 90% Wind: Calm Pressure: 29.80 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

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

Updated: 9:03 AM CST

Temperature: 25.9 °F Dew Point: 24 °F Humidity: 92% Wind: Calm Pressure: 30.43 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: Fox Haven, OFallon, MO

Updated: 8:55 AM CST

Temperature: 27.6 °F Dew Point: 26 °F Humidity: 93% Wind: Calm Pressure: 30.41 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: CommuniTree Gardens Nursery, St. Louis, MO

Updated: 9:02 AM CST

Temperature: 27.7 °F Dew Point: 26 °F Humidity: 94% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Windchill: 28 °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 
435 am CST sun Mar 1 2015 


Short term: (through Tuesday night) 
issued at 400 am CST sun Mar 1 2015 


The busy stretch of wx thru mid-week continues. This major winter 
storm is winding down slowly across our region with another spat or 
two of winter wx set for Monday night and again on Tuesday night and 
perhaps into Wednesday. 


Precipitation across our area early this morning can be divided into 
two main regions by primary Mode of forcing. A band of snow 
stretching across much of northern MO is being driven by 
frontogenesis with enough moisture thru the column. The swath of 
pcpn mainly to the S and east of stl Metro is being driven by warm air advection and 
ranges from snow around I-70 and I-64 in Illinois to sleet and freezing 
rain for areas mainly south of Farmington, MO. 


Moisture thru the column will hold steady thru much of the morning 
before drier air begins to filter in from the north. 
Frontogenetical forcing across the north will weaken and exit by 
mid-morning but a new area of frontogenesis is anticipated to move 
in along the I-70 corridor this afternoon from west to east. But by 
this time, moisture thru the column will be in decline and so the 
band of pcpn that will likely result will be something that is 
weaker than what we see across northern MO now. If the model 
estimates of moisture are wrong and/or the narrow nature of the 
frontogenesis is stronger, we may end up getting a narrow band of 
snow that adds 1-2" more than what we have forecast. Probably a 
feature that will need to be Nowcast more aggressively once it 
finally appears late this morning-midday. 


The warm air advection-generated pcpn is expected to weaken and/or exit our County Warning Area by 
late morning. 


Add to all of this some dry-slotting near and just south of I-70 
this morning with weak lo-level convergence resulting in patchy 
freezing drizzle. 


Pcpn-types should remain all snow for areas north of I-70 for the 
duration of this event today. Sleet is anticipated to mix in with 
the pcpn that falls as far north as the I-70 corridor during the day 
today, while freezing rain should be confined to areas along and 
south of a Crawford County MO to Washington County Illinois line, but even 
then freezing rain should be done by midday as temps rise just above 
freezing. 


Putting it all together, additional snow accums of 1-2" appear 
likely thru late this afternoon for areas near and north of I-70 in 
MO and near and north of I-64 in Illinois. Additional snow and sleet 
accums of less than an inch for elsewhere. Light glazing of ice is 
likely for much of southeast MO and southern Illinois for this morning. 
Plan on keeping headlines the same for the vast majority of the 
counties, but will tack on Marion Illinois and Washington Illinois to the 
warning with what has already fallen and over an inch of new snow 
still expected. 


After a break in the action Sunday night and Monday, strong warm air advection will 
generate a new round of pcpn Monday night as a surface warm front 
passes thru and resulting in rising overnight temps. The pcpn-types 
should overwhelmingly be liquid, with some sleet possible in far 
northern MO and central Illinois. Unfortunately, it looks like there will 
remain enough cold air in place at the surface early in the event 
before the surface temps have had a chance to rise too much to 
result in some light freezing rain for much of the area. It should 
be short-lived, with temps by 12z/Tue expected to be above freezing 
for all locations. 


Rounds of showers with some thunderstorms are still on tap for 
Tuesday with an 18-hour period or so of mild temps, as they rise 
well thru the 40s and into the 50s for some areas. A strong cold 
front will move thru late Tuesday afternoon and evening and drop 
temps rapidly back below freezing. But much of the pcpn will be 
done by then with minimal impact from snow expected. 


Large model discrepancies are in place for Wednesday but the 
consensus now is to suppress pcpn to our south. The NAM is a big 
outlier here, forecasting another round of heavy snow. Given its 
track record on day 3, will forego using this for the forecast with 
this package, but it is in the realm of possibilities with all 
models showing varying degrees of a northern surge of pcpn on Wed. 
Something to keep an eye on. 


Tes 


Long term: (wednesday through saturday) 
issued at 400 am CST sun Mar 1 2015 


Colder conditions are expected for Wednesday as a strong surface 
ridge builds southeastward into MO from the northern plains. Will 
keep a chance of precipitation across southeast MO and southwest Illinois 
on Wednesday as a positively tilted upper level trough with embedded 
shortwaves remains west of the forecast area. The GFS model shifts 
the precipitation southeast of our forecast area by Wednesday, while 
the European model (ecmwf) still has light qpf across southern portions of MO and IL, 
south of stl. Precipitation type should be all snow with 850 mb 
temperatures falling well below zero degrees c across the southern 
portion of the forecast area on Wednesday. Little diurnal rise in 
temperatures is expected on Wednesday due to low level cold air 
advection. Low temperatures Wednesday night will be unseasonably 
cold with the surface high dropping into our forecast area, and 
850 mb temperatures of only -13 to -18 degrees c across the forecast 
area. Warmer temperatures can be expected for Thursday night and 
Friday as the surface ridge moves east of our area and the surface 
wind becomes southerly. A cold front will move southeastward 
through our area late Friday night and Saturday. Precipitation is 
not expected with this front due to very limited moisture and only 
weak upper level forcing. Only slightly cooler air will filter into 
the region behind the front Saturday and Saturday night. 


Gks 


&& 


Aviation: (for the 12z tafs through 12z Monday morning) 
issued at 417 am CST sun Mar 1 2015 


Light snow will continue this morning with brief periods of 
heavier snow possible. It appears that the snow will end in uin 
and cou by 18z Sunday, but may continue until late afternoon in 
the St Louis Metro area. The visibilities will improve later this 
morning as the snow tapers off. Could not rule out a brief period 
of light freezing drizzle this morning along with the snow. 
The low level cloud cigs should scatter out this evening as drier 
air filters southeastward into the region. Light surface winds 
will become nwly this afternoon as a surface ridge builds 
southeastward into our area. 


Specifics for kstl: light snow will continue this morning into the 
early afternoon. The snow should end by late afternoon. The low 
level cloud ceiling should scatter out this evening. The light 
surface wind will become nwly this afternoon. 


Gks 


&& 


Lsx watches/warnings/advisories: 
MO...Winter Storm Warning until noon CST today for Crawford MO- 
Washington MO. 


Winter Weather Advisory until noon CST today for Iron MO-Madison 
MO-Reynolds MO-St. Francois MO-Ste. Genevieve MO. 


Winter Storm Warning until 6 PM CST this evening for Franklin MO- 
Gasconade MO-Jefferson MO-Lincoln MO-Osage MO-St. Charles 
MO-St. Louis city MO-St. Louis MO-Warren MO. 


Winter Weather Advisory until 6 PM CST this evening for Audrain 
MO-Boone MO-Callaway MO-Cole MO-Knox MO-Lewis MO-Marion MO- 
Moniteau MO-Monroe MO-Montgomery MO-Pike MO-Ralls MO-Shelby 
MO. 


Illinois...Winter Weather Advisory until noon CST today for Randolph Illinois. 


Winter Storm Warning until 6 PM CST this evening for Bond Illinois- 
Calhoun Illinois-Clinton Illinois-Fayette Illinois-Greene Illinois-Jersey Illinois- 
Macoupin Illinois-Madison Illinois-Marion Illinois-Monroe Illinois-Montgomery Illinois- 
St. Clair Illinois-Washington Illinois. 


Winter Weather Advisory until 6 PM CST this evening for Adams Illinois- 
Brown Illinois-Pike Illinois. 


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Weather forecast office lsx 



National Weather Service Glossary of Abbreviations

Non-Expanded Version (with abbreviations)

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