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National Weather Service:
Special Statement

Current Conditions
Updated: 3:15 PM CST on February 11, 2012
Clear Mount Vernon: 27°
 Clear
Wind: 7 mph from the NNW
Dew Point: 7 °F
Pressure: 30.47 in
Windchill: 19 °F
Humidity: 43%
Visibility: 10.0 miles
Local Radar
Local Satellite
5 Day Forecast for Mount Vernon
Sat Sun Mon Tue Wed
Partly Cloudy Clear Snow Ice Pellets Partly Cloudy
Partly Cloudy Clear Snow Ice Pellets Partly Cloudy
27° | 13° 29° | 16° 32° | 29° 40° | 27° 45° | 34°
Forecast as of 2:55 PM CST on February 11, 2012

Tonight
Clear. Lows around 15. Northwest winds 10 to 15 mph.
Sunday
Sunny. Highs in the lower 30s. West winds 10 to 15 mph.
Sunday Night
Mostly clear. Lows around 20. South winds 5 mph.
Monday
Cloudy. A 50 percent chance of sprinkles...snow and sleet in the afternoon. Highs in the upper 30s. Temperature steady or slowly falling in the afternoon. South winds 10 to 15 mph.
Monday Night
Occasional snow in the evening...then a chance of snow after midnight. Lows around 30. South winds 5 to 10 mph. Chance of precipitation near 100 percent.
Tuesday
Mostly cloudy. Highs around 40.
Tuesday Night
Partly cloudy. Lows in the upper 20s.
Wednesday
Partly sunny. Highs in the upper 40s.
Wednesday Night
Mostly cloudy with a 50 percent chance of rain. Lows in the upper 30s.
Thursday
Mostly cloudy with a 40 percent chance of rain. Highs in the lower 50s.
Thursday Night and Friday
Partly cloudy. Lows in the lower 30s. Highs in the upper 40s.
Friday Night and Saturday
Mostly clear. Lows in the lower 30s. Highs in the upper 40s.
Astronomy
Sunrise:06:51 AM (CST) Moon Rise:10:11 PM (CST)
Sunset:05:29 PM (CST) Moon Set:08:38 AM (CST)
Moon Phase
Feb. 11 Feb. 14 Feb. 21 Feb. 29 Mar. 08
Special Statement
Statement as of 2:41 PM CST on February 11, 2012

... Winter weather event likely by Monday afternoon on through
Monday night...

Moisture will over spread the region Monday... ahead of an upper
level storm system... forecast to be over western Missouri by
Monday evening. The wintry precipitation may be slow to develop
initially Monday west of the Mississippi River over southeast
Missouri... as the airmass will be very dry across the region.
However by afternoon... wintry precipitation should work its way to
the surface... with the activity spreading east from southeast
Missouri Monday afternoon... to areas east of the Mississippi River
including southern Illinois... southwest Indiana and west Kentucky
late Monday afternoon into Monday evening.

Most of the wintry precipitation is expected to be in the form
of snow. However... mixed wintry precipitation is possible as well
with this event... especially south of the Ohio River... and
over southeast Missouri... mainly south of Highway 60.

Preliminary indications suggest no less than 1 to 2 inches may
accumulate most areas. Some data suggests higher amounts will
be possible. Given the Prospect for mixed wintry precipitation
and the variance seen in the model data... it is still a bit too
soon to gauge snowfall amounts with much confidence. The latest
data suggests higher precipitation rates will occur south of a
line from Perryville Missouri to Owensboro Kentucky.

Despite the uncertainties with respect to snow amounts... it does
appear that travel impacts will be possible Monday night. Surface
temperatures... antecedent Road conditions... and precipitation
rates will all play a role in the level of impact. Given the cold
air well established across the region ahead of the approaching
system... accumulation will begin shortly after onset.

So... stay tuned for the latest updates. It is possible either
a watch... warning or advisory may be required for the upcoming
event.


Cn



229 PM CST Sat Feb 11 2012

... Winter weather event likely by Monday afternoon on through
Monday night...

Moisture will over spread the region Monday... ahead of an upper
level storm system... forecast to be over western Missouri by
Monday evening. The wintry precipitation may be slow to develop
initially Monday west of the Mississippi River over southeast
Missouri ... S the airmass will be very dry across the region.
However by afternoon... wintry precipitation should work its way to
the surface... with the activity spreading east from southeast
Missouri Monday afternoon... to areas east of the Mississippi
River including southern Illinois... southwest Indiana and west
Kentucky late Monday afternoon into Monday evening.

Most of the wintry precipitation is expected to be in the form
of snow. However... mixed wintry precipitation is possible as well
with this event... especially south of the Ohio River... and
over southeast Missouri... mainly south of Highway 60.

Preliminary indications suggest no less than 1 to 2 inches may
accumulate most areas. Some data suggests higher amounts will
be possible. Given the Prospect for mixed wintry precipitation
and the variance seen in the model data... it is still a bit too
soon to gauge snowfall amounts with much confidence. The latest
data suggests higher precipitation rates will occur south of a
line from Perryville Missouri to Owensboro Kentucky.

Despite the uncertainties with respect to snow amounts... it does
appear that travel impacts will be possible Monday night. Surface
temperatures... antecedent Road conditions... and precipitation
rates will all play a role in the level of impact. Given the cold
air well established across the region ahead of the approaching
system... accumulation will begin shortly after onset.

So... stay tuned for the latest updates. It is possible either
a watch... warning or advisory may be required for the upcoming
event.
 

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