Thursday, February 20, 2014
 
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Flooding, severe storms, high winds in store as day progresses

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[February 20, 2014]  The National Weather Service in Lincoln released the following weather outlook at 6:09 a.m. Thursday for portions of central and east-central Illinois.

A flood watch is in effect through Thursday afternoon, and a high-wind warning is in effect from 3 p.m. Thursday to 3 a.m. Friday for the counties of Cass, Champaign, Christian, DeWitt, Fulton, Knox, Logan, Macon, Marshall, Mason, McLean, Menard, Morgan, Peoria, Piatt, Sangamon, Schuyler, Scott, Stark, Tazewell, Vermilion and Woodford.

Thursday and Thursday night

Rain and thunderstorms will continue through much of Thursday before diminishing from the west during the late afternoon. While severe weather is not likely, isolated storms may produce strong winds. Another half-inch of rain is likely, continuing the threat for flooding. River levels will be on the rise, and there is some potential for minor river flooding to develop. This will be enhanced by the potential for ice jams as the warm temperatures and water runoff cause ice to break up and move downstream.

Strong southwest to west winds are expected behind the storm late Thursday afternoon and Thursday night, with gusts of 50 to 60 mph likely for a period late in the afternoon into the evening.

Friday through Wednesday

No hazardous weather is expected at this time.

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High wind warning
3 p.m. Thursday to 3 a.m. Friday

According to the National Weather Service in Lincoln at 3:15 a.m. Thursday, high winds are expected Thursday evening.

A deepening area of low pressure will track from near Kansas City on Thursday morning to southwestern Wisconsin by evening. As the low moves into Wisconsin, very strong winds will develop across central Illinois during the late afternoon and evening. Westerly winds will increase to between 35 and 40 mph, with gusts potentially reaching 55 to 60 mph at times.

A high wind warning is in effect from 3 p.m. Thursday to 3 a.m. Friday for the counties of Knox, Stark, Peoria, Marshall, Woodford, Fulton, Tazewell, McLean, Schuyler, Mason, Logan, De Witt, Piatt, Champaign, Vermilion, Cass, Menard, Scott, Morgan, Sangamon, Christian, Macon, Moultrie, Douglas, Edgar, including the cities of Galesburg, Peoria, Bloomington, Normal, Havana, Lincoln, Champaign, Urbana, Danville, Jacksonville, Springfield, Taylorville and Decatur.

Timing: Very strong winds will develop behind a departing cold front by late Thursday afternoon, then continue into the overnight hours.

Winds: Westerly winds will increase into the 35 to 40 mph range, with gusts potentially reaching 55 to 60 mph at times.

Impacts: Travel will become difficult on north-south-oriented roads such as Interstate 55 and Interstate 57. Motorists are advised to drive with caution.

Precautionary, preparedness actions: A high-wind warning means a hazardous high-wind event is expected or occurring. Sustained wind speeds of at least 40 mph or gusts of 58 mph or more can lead to property damage.

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Flood watch

According to the National Weather Service in Lincoln at 3:17 a.m. Thursday, a flood watch remains in effect through Thursday afternoon for the counties of Knox, Stark, Peoria, Marshall, Woodford, Fulton, Tazewell, McLean, Schuyler, Mason, Logan, DeWitt, Piatt, Champaign, Vermilion, Cass, Menard, Scott, Morgan, Sangamon, Christian, Macon, including the cities of Galesburg, Peoria, Bloomington, Normal, Havana, Lincoln, Champaign, Urbana, Danville, Jacksonville, Springfield, Taylorville and Decatur.

The flood watch continues for portions of central and east-central Illinois, including the following areas: Cass, Christian, De Witt, Fulton, Knox, Logan, Macon, Marshall, Mason, McLean, Menard, Morgan, Peoria, Piatt, Sangamon, Schuyler, Scott, Stark, Tazewell and Woodford in central Illinois and Champaign and Vermilion in east-central Illinois.

A storm system will bring moderate to heavy rains to portions of central Illinois through Thursday. Rain totals of over an inch are likely from Beardstown to Bloomington northward, with one-half to three-fourths of an inch of rain along the Interstate 72 corridor east to Danville.

Some areas under stronger showers may see locally higher amounts. Most of these areas still have a deep snow cover on the ground, with significant water content within it. The ground is frozen to a depth of 10 to 15 inches, so despite the warmer temperatures, the rain and melting snow will run off instead of significantly soaking into the ground. Thunderstorms producing a lot of precipitation quickly will intensify the threat for flooding.

Area creeks and rivers will likely see rises associated with the rainfall and snowmelt. Water will fill ditches and possibly cover roads, particularly in low-lying areas. Urban areas will also likely see some flooding in poor drainage areas and where storm drains are clogged by snow and ice.

Precautionary, preparedness actions: A flood watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. People living in areas prone to flooding should be prepared to take action should flooding develop. Do not drive across areas where water covers the road.

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NWS main page with graphics: http://www.crh.noaa.gov/ilx/ 

[Text from National Weather Service, Lincoln office]

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