Through 3 PM...a narrow area of light to moderate showers with isolated thunderstorms will continue to move southeast across portions of southern Illinois and west Kentucky. Most of the thunderstorm activity will occur from The Mount Vernon Illinois area southwest to the Ohio River...with light to moderate showers and an isolated thunderstorm extending from near Smithland Kentucky southwest through the southern pennyrile area. Throughout the day the thunderstorms have produced torrential rains with street flooding reported in several communities. Hourly rainfall amounts will range from a couple hundredths of an inch in the light showers...up to as much as one inch in the stronger storms.
Forecast for Williamson
Updated: 10:37 am CDT on July 11, 2009
Rest of Today
Mostly cloudy. Showers and thunderstorms late in the morning...then scattered showers and thunderstorms in the afternoon. Some thunderstorms may produce heavy rainfall. Highs in the lower 80s. West winds 5 to 10 mph late in the morning shifting to the north in the afternoon. Chance of precipitation 90 percent.
Mostly cloudy with a 50 percent chance of showers and thunderstorms. Lows in the lower 70s. South winds 5 mph.
Monday
Mostly cloudy with a 30 percent chance of showers and thunderstorms. Highs in the upper 80s. Southeast winds 5 mph in the morning shifting to the north in the afternoon.
... The Flash Flood Warning will expire at 230 PM CDT for Jackson and Williamson counties in southern Illinois...
The storms that prompted the warning have moved out of the region... therefore the warning will be allowed to expire. More showers and thunderstorms are anticipated through the afternoon hours and may cause additional flooding issues.
The National Weather Service in Paducah has issued an
* urban and small stream flood advisory for... Franklin County in south central Illinois... Williamson County in southern Illinois...
* until 430 PM CDT.
* At 227 PM CDT... a cluster of thunderstorms will quickly track south southast across the warned area through 330 PM. These storms will be capable of torrential rains with rates of 1 to 3 inches per hour. Flood prone areas will be quicker to react to heavy rain due to flooding earlier in the day.
Precautionary/preparedness actions...
Excessive runoff from heavy rainfall will cause elevated levels on small creeks and streams... and ponding of water in urban areas... highways... streets and underpasses as well as other poor drainage areas and low lying spots.
Do not drive your vehicle into areas where the water covers the roadway. The water depth may be too great to allow your car to cross safely. Move to higher ground.