Increasing southerly low/mid level flow across portions of the mid Mississippi Valley is increasing the chance of thunderstorms in the area tonight. The heaviest rain in the Chicago area is expected somewhere over Cook, Kane, Lake, and McHenry counties. At least 0.57 inch of rain is likely by 7:00 a.m. However, conditions which could cause training thunderstorms (a continuous series of thunderstorms over the same region) are possible. Training thunderstorms could bring 2-4 inches of rain or more.
Thunderstorm Training
A series of thunderstorm cells that move over the same region in a relatively short period of time. Training thunderstorms are capable of producing excessive rainfall totals, which can cause flash flooding. “Training” is used to describe the analogy of a train and rail cars that travel along a track (a single path).
Weather Radar (also nexrad.chgowx.com) shows the possibility of training thunderstorms developing from Whiteside County to Ogle County to DeKalb County to Kane County to Cook County at 8:35 p.m.
Scattered showers and T-storms continue through the remainder of the evening over northern IL. pic.twitter.com/eZOWA8FrHH
— NWS Chicago (@NWSChicago) September 2, 2018
Isolated to scattered showers and T-storms possible early this evening over northern IL. #ILWX pic.twitter.com/3d2uKP6RQE
— NWS Chicago (@NWSChicago) September 1, 2018
Sunday-Tuesday outlook: Hot and humid. After any morning t-storms end Sun. AM, small chance in afternoon NW & N central IL. Higher probability of t-storms Sun. night into Mon. AM for far N IL. Chance for t-storms #LaborDay aftn, highest N of I-80. Tuesday mainly dry. #ilwx #inw pic.twitter.com/QyhNcp5CZD
— NWS Chicago (@NWSChicago) September 1, 2018
A Flash Flood Watch has been issued and is in effect from 7pm this evening through early Sunday morning for the counties shaded in dark green in Illinois. #ilwx pic.twitter.com/hyKTR2XijT
— NWS Chicago (@NWSChicago) September 1, 2018
SPC Sep 2, 2018 0100 UTC Day 1 Convective Outlook: SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sat Sep 01 2018 Valid 020100Z – 021200Z …THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS… https://t.co/iYKh2iZk9u pic.twitter.com/qNNsMtcGFb
— Cardinal Weather (@CardinalWeather) September 2, 2018
O’HARE FORECAST …
Tonight: Showers and thunderstorms likely, mainly after 9pm. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 71. Southwest wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday: A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 87. South southwest wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Sunday Night: A 40 percent chance of showers and thunderstorms, mainly after 7pm. Mostly cloudy, with a low around 73. South southwest wind 5 to 10 mph.
Labor Day: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86. South southwest wind 5 to 10 mph.
Monday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 73. South southeast wind around 5 mph.
Tuesday: Mostly sunny, with a high near 89.
Tuesday Night: Partly cloudy, with a low around 73.
Wednesday: A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 86.
Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68.
Thursday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 76.
Thursday Night: A chance of showers. Mostly cloudy, with a low around 65.
Friday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 74.
Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Saturday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 75.
FLASH FLOOD WATCH …
Flood Watch
National Weather Service Chicago IL
307 PM CDT Sat Sep 1 2018
…Additional Thunderstorms This Evening and Overnight…
.Thunderstorms are expected to redevelop this evening and tonight
across far northern Illinois. A tropical, moisture rich air mass
will promote efficient and heavy rainfall rates. Thunderstorms may
regenerate or move over areas already impacted by heavy rainfall
resulting in flash flooding.
ILZ003>006-008-010>014-020415-
/O.NEW.KLOT.FF.A.0007.180902T0000Z-180902T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook-
Including the cities of Rockford, Belvidere, Woodstock, Waukegan,
Oregon, Dixon, DeKalb, Aurora, Elgin, Wheaton, and Chicago
307 PM CDT Sat Sep 1 2018
…FLASH FLOOD WATCH IN EFFECT FROM 7 PM CDT THIS EVENING THROUGH
SUNDAY MORNING…
The National Weather Service in Chicago has issued a
* Flash Flood Watch for portions of north central Illinois and
northeast Illinois, including the following areas, in north
central Illinois, Boone, DeKalb, Lee, Ogle, and Winnebago. In
northeast Illinois, Cook, DuPage, Kane, Lake IL, and McHenry.
* From 7 PM CDT this evening through Sunday morning
* Repeated rounds of thunderstorms producing very heavy rainfall
may result in flash flooding.
* Expect rises on area rivers and streams.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
LAKE TEMPS …
SOUTHERN LAKE MICHIGAN WATER TEMPERATURES
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1027 AM CDT Sat Sep 1 2018
CHICAGO SHORE……….73.
CHICAGO CRIB……….61.
WILMETTE BUOY……….68.
WAUKEGAN BUOY……….65.
WINTHROP HARBOR BUOY……….M.
MICHIGAN CITY……….53.
MICHIGAN CITY BUOY……….73.
SOUTH MID LAKE BUOY……….72.
NORTH MID LAKE BUOY……….67.
&&
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.
september.chicagoweatherstation.com
Chicago Weather Forecast for your MAC/PC/TABLET includes surrounding suburbs.
^^ MOBILE? USE VOICE MIC ^^
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