Thunderstorms Weaken, Slow Down Over Lake County; Stay Strong Near Rockford

EXCESSIVE HEAT WARNING EXPIRED 7 PM, DIMINISHED THUNDERSTORMS TONIGHT, LOW 65°F AS SOON MIDNIGHT

A line of thunderstorms moving south-southeast across northern Illinois slowed down and weakened after about 5:40 p.m. while the outflow boundary sped ahead southbound. Air temperatures at NWS Chicago Executive Airport was 78°F at 5:52 p.m. while NWS O’Hare International Airport remained at 92°F at 5:51 p.m.

Humidity has been high today with Dew Points staying in the low 70s through about 3:00 p.m. The high temperature at O’Hare at 2:51 p.m. and 4:51 p.m. was 94°F. the Heat Index was 100°F at 2:51 p.m. at O’Hare.


The air temperature is expected to dropped in central Arlington Heights at about 5:30 p.m. The temperature is forecast fall to 73°F by 8:00 p.m. The greatest chance for thunderstorms are between 7:00 p.m. and 9:00 p.m. Arlington Heights, but these storms on the east of line of thunderstorms may die out bring minimal rainfall. The forecast for the northwest suburbs was about 0.9″ to 1.0″ of rain by midnight, with more rain locally in some thunderstorms, but it now appears Arlington Heights might not even get a half inch of rain by midnight. The last significant rainfall amount in Arlington Heights was 1.25″ on Saturday, June 16, 2018 from about 3:00 a.m. to 7:00 a.m.

Weather Radar (also nexrad.chgowx.com) shows a line of thunderstorms the border counties along the Illinois-Wisconsin State Line, moving southeast. The front edge of the thunderstorms was at the Lake-Cook border at 6:25 p.m. Also, a light outer flow boundary was just starting to cross the Lake-Cook boundary at 5:20 p.m. The southbound outer flow boundary sped ahead and was more than halfway through the top half of DuPage County and Cook County at 6:25 p.m. The line of thunderstorms slowed down significantly and appears to hit a dry area in north and northwest Cook County. On radar the image looks like a dry hole over north and northeast Cook County. There is a little rain and a only a single thunderstorm cell north of Madison, Wisconsin, but otherwise there is nothing major behind the first diminished line of storms.








 O’HARE FORECAST … 

Tonight: Showers and thunderstorms, mainly before 2am. Low around 65. West southwest wind 5 to 15 mph becoming northeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Tuesday: A 40 percent chance of showers and thunderstorms after 8am. Cloudy, with a high near 75. Northeast wind around 5 mph.

Tuesday Night: Showers and thunderstorms likely, mainly between 8pm and 2am. Cloudy, with a low around 63. North northeast wind 5 to 10 mph. Chance of precipitation is 60%.

Wednesday: A 50 percent chance of showers and thunderstorms, mainly before 2pm. Mostly cloudy, with a high near 74. Northeast wind 5 to 10 mph.

Wednesday Night: A 20 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 62.

Thursday: Partly sunny, with a high near 77.

Thursday Night: Showers and thunderstorms likely, mainly after 2am. Mostly cloudy, with a low around 61.

Friday: Showers and thunderstorms likely. Cloudy, with a high near 73.

Friday Night: Showers and thunderstorms likely, mainly before 2am. Mostly cloudy, with a low around 63.

Saturday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 76.

Saturday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 63.

Sunday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 81.

Sunday Night: Mostly cloudy, with a low around 64.

Monday: Mostly sunny, with a high near 81.

 LAKE TEMPS … 

SOUTHERN LAKE MICHIGAN WATER TEMPERATURES
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
909 AM CDT Mon Jun 18 2018

CHICAGO SHORE……….66.

CHICAGO CRIB……….57.

WILMETTE BUOY……….64.

MICHIGAN CITY……….53.

MICHIGAN CITY BUOY……….68.

SOUTH MID LAKE BUOY……….59.

NORTH MID LAKE BUOY……….41.

june.chicagoweatherstation.com

Arlingtoncardinal.com/radar

Chicago Weather Forecast for your MAC/PC/TABLET includes surrounding suburbs.

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