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Weather Today

SATURDAY NIGHT: Steady snowfall. Low: 21. Winds: Southeast 5-10 mph.

SUNDAY: Morning scattered snow showers. Total accumulations 4-6". High: 30. Winds: Southeast 5-10 mph.

MONDAY: Partly Sunny. High: 32. Winds: Light Northwest.

Thomas Patrick
Storm Team 20 Meteorologist

Almanac

SATURDAY, FEBRUARY 28, 2015

NORMAL HIGH:
45
NORMAL LOW: 27

RECORD HIGH: 68 (1972)
RECORD LOW:
1 (1891)

SUNRISE:
6:34 a.m.
SUNSET:
5:49 p.m.

Snow is already beginning to fall and accumulate around central Illinois this evening, and the heaviest is expected to fall overnight.

A WINTER STORM WARNING is in effect for Greene, Fayette, Macoupin, and Montgomery counties until 6pm Sunday.

A WINTER WEATHER ADVISORY is in effect for the rest of central Illinois until 6pm Sunday. Those counties are Cass, Christian, De Witt, Effingham, Logan, Macon, Mason, Menard, Morgan, Moultrie, Piatt, Sangamon, Scott, and Shelby counties.

A cut off low pressure spinning over California has adjusted the pattern of the jet stream, and it now orientated southwest to northeast. The low is ejecting small piece of energy along the jet stream. These features will carry pacific moisture with it and drop precipitation along the storm track. This particular system is tracking towards southern Illinois and because air temperatures are well below freezing thanks to lingering arctic air, snow will fall tonight as a result. The heaviest period of snowfall will be between 9pm and 3am tonight, and as the storm slides east, snow will tapper off and become more scattered by the morning hours. Total accumulations are expected around 4-6 inches for all of central Illinois. There is a slight chance that some isolated storm reports of 8" may be found between I-72 and I-70 north of St. Louis, south of Springfield.

A second system will travel along the jet stream in the same fashion, but track further north for Monday night into Tuesday. air temperatures this time around will warm from the mid-20s overnight to the low to mid 40s during the day. Precipitation type may start as freezing rain or mixed precipitation Monday night, but transition into all rain Tuesday. Rainfall Tuesday could be around 1" and that plus the melting snow pack could create flooding concerns for early March. We will have updates on this system as we get closer.

THE 7-DAY TEMPERATURE OUTLOOK: Look for highs near 30 Sunday; low 30s Monday; low to mid 40s Tuesday; upper teens to near 20 Wednesday and Thursday; upper 30s Friday; and low 40s Saturday. Overnight lows will fall to the lower 20s Saturday night; mid teens Sunday night; lower to mid 20s Monday night, mid teens and Tuesday night; single digits Wednesday night; mid teens Thursday night; and mid 20s Friday night. 

Thomas Patrick
Storm Team 20 Meteorologist


 

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