A National Weather Service forecast for overnight seems to be a little off the mark.
Partly cloudy, with a low around 69. Southeast wind around 5 mph becoming calm in the evening.
NWS Forecast for Arlington Heights at 8:39 p.m.
Weather forecasters did not expect much convection or instability in the Chicago area tonight, but were open to the possibility.
Currently severe thunderstorms are affecting southwest and south-central Wisconsin about 8:30 p.m. Tuesday.
At 8:35 p.m. Teusday September 4, 2012 …
Janesville, Wisconsin is under a Severe Thunderstorm Warning.
Delevan, Wisconsin is under a Severe Thunderstorm Warning.
Lake Geneva, Wisconsin is under a Severe Thunderstorm Warning.
Radar image showing bowing (indicating high winds), intense thunderstorms and at least one cell forming ahead of the main storm (LIVE RADAR).
SEVERE THUNDERSTORM WARNING (issued for southern Wisconsin)
BULLETIN – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
835 PM CDT TUE SEP 4 2012
THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR…
DODGE COUNTY IN SOUTHEAST WISCONSIN…
EASTERN JEFFERSON COUNTY IN SOUTHEAST WISCONSIN…
SOUTHERN ROCK COUNTY IN SOUTH CENTRAL WISCONSIN…
WALWORTH COUNTY IN SOUTHEAST WISCONSIN…
WESTERN WASHINGTON COUNTY IN SOUTHEAST WISCONSIN…
WAUKESHA COUNTY IN SOUTHEAST WISCONSIN…
* UNTIL 930 PM CDT
* AT 833 PM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL…AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM BEAVER DAM TO LAKE MILLS
TO BROOKLYN…AND MOVING EAST AT 40 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR…
JUNEAU DODGE AIRPORT…WATERTOWN AIRPORT…WATERTOWN AND
ORFORDVILLE AROUND 845 PM CDT.
HORICON AROUND 850 PM CDT.
MAYVILLE AND HUSTISFORD AROUND 855 PM CDT.
THERESA…JANESVILLE AIRPORT AND IRON RIDGE AROUND 900 PM CDT.
PALMYRA…OKAUCHEE LAKE…DOUSMAN AND BELOIT AROUND 905 PM CDT.
LAPHAM PEAK STATE PARK AROUND 910 PM CDT.
OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
LEBANON…NEWARK…HANOVER…IXONIA AND SULLIVAN.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR…DESTRUCTIVE HAIL…DEADLY LIGHTNING…AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
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