Severe Thunderstorm Watch, But Diminishing Risk of Severe Weather

Severe Thunderstorm Watch 403 issued Wednesday, August 11, 2021 at 8:20 p.m.
Severe Thunderstorm Watch 403 issued Wednesday, August 11, 2021 at 8:20 p.m.

When storms are delayed the outcome is sometimes associated with lack of intensity and diminishing storms. Storms have already diminished ahead of a cold front that has also weakened in southwest Wisconsin. A line of storms passing to the south of Arlington Heights moved east did not develop northward into Arlington Heights, so the big question is whether larger storm cells will develop later tonight. The peak time for storm development is between 9:00 p.m. Wednesday and 1:00 a.m. Thursday, but the coverage of storms may be sparse or do we dare say … non-existent. Well for liability sake, some community or communities may experience a passing thunderstorm cell overnight Wednesday to Thursday. Remember that tonight’s forecast included a threat of severe weather for at least the past 24 hours.




The NOAA Storm Prediction Center’s latest Day 1 Convective Outlook dropped the Enhanced Risk category so that all of northern Illinois is in a Slight Risk category. The Tornado Outlook also reduced the probability of tornadoes to a “2% probability of a tornado within 25 miles of a point” in the map zone that includes all of northern Illinois. Severe thunderstorms associated with wind damage, hail and an isolated tornado threat will be possible. according to the NOAA Storm Prediction Center.

A Severe Thunderstorm Watch was activated at 8:20 p.m. and “Watch 430” is in effect until 2:00 a.m. CDT for the following Illinois counties …

BUREAU, COOK, DE KALB
DUPAGE, GRUNDY, KANE
KANKAKEE, KENDALL, LAKE
LA SALLE, LEE, LIVINGSTON
MCHENRY, PUTNAM, WILL

Weather Radar) showed a thin, solid line of storms that barely reached the southern border of northwest Cook County, and extended southwest to an area just north of Peoria at 9:00 p.m. The line dissipated as it approached the eastern border of DuPage County, and was barely a thundershower at 10:20 p.m.

 O’HARE FORECAST … 

Tonight: Showers and thunderstorms likely, mainly before 3am. Some storms could be severe, with large hail, damaging winds, and heavy rain. Mostly cloudy, with a low around 73. West southwest wind 10 to 15 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

Thursday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 97. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.

Thursday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 69. West northwest wind 5 to 15 mph.

Friday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 82. North wind 5 to 10 mph.

Friday Night: Mostly clear, with a low around 62. North wind 5 to 10 mph becoming light and variable after midnight.

Saturday: Sunny, with a high near 82.

Saturday Night: Mostly clear, with a low around 63.

Sunday: Sunny, with a high near 81.

Sunday Night: Mostly clear, with a low around 63.

Monday: Sunny, with a high near 82.

Monday Night: Mostly clear, with a low around 66.

Tuesday: Mostly sunny, with a high near 85.

Tuesday Night: Partly cloudy, with a low around 68.

Wednesday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86.

 LAKE TEMPS … 

SOUTHERN LAKE MICHIGAN WATER TEMPERATURES
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
918 AM CDT Tue Aug 10 2021

LAKE MICHIGAN WATER TEMPERATURES…

CHICAGO SHORE……….75.

CHICAGO CRIB……….71.

WILMETTE BUOY……….72.

WAUKEGAN BUOY……….71.

WINTHROP HARBOR BUOY……….70.

MICHIGAN CITY……….73.

MICHIGAN CITY BUOY……….M.

SOUTH MID LAKE BUOY……….72.

NORTH MID LAKE BUOY……….69.

&&

M IS FOR MISSING DATA THAT IS NORMALLY AVAILABLE.

THE MICHIGAN CITY WATER TEMPERATURE SENSOR IS LOCATED AT A WATER
INTAKE ONE MILE OFFSHORE AND 60 FEET BELOW WATER SURFACE. IT IS READ
EVERY DAY OF THE YEAR.

august.chicagoweatherstation.com

Arlingtoncardinal.com/radar

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