Severe Thunderstorm Threat Passing Over Arlington Heights with Trailing Edge Over Lake Cook Rd 10:45 p.m.

A Severe Thunderstorm Warning issued at 10:14 p.m. brought heavy rain but little cloud-to-ground lightning.

Thunderstorm with tops at about 40,000 feet had been stable since development near Rockford during the hour’s track to the northwest suburbs and Arlington Heights. Predicted hail size was as high as 2.0 inches.

Hail about .25-inch or less was falling about 10:40 p.m.

A constant rumbling like a freight train was heard for a period of at least 10 minutes; however, no Tornado Warning was issued as of 10:40 p.m. The rumbling is possibly from constant thunder with constant cloud-to-cloud lightning at upper elevations. The constant rumbling was heard from about 10:25 p.m. until about 10:40 p.m.

There was little cloud-to-ground lightning with this storm.

Lake County Illinois lightning during tornado and severe thunderstorm as viewed from Arlington Heights. Lightning was continuous as the storm, which was a moderate band about the length of Lake County north-to-south, moved east to Lake Michigan.

A more severe storm hit Lake County Illinois about 8:45 p.m. just before the Arlington Heights storm that hit Arlington Heights and the northwest suburbs at about 10:30 p.m. Several photos of tornados were captured, and the Grayslake Fire Department activated a MABAS Box Alarm for damage in Grayslake.

The Lake County storm at about 8:45 p.m. was a smaller cell that packed more energy than the larger line of storms that passed through Arlington Heights at about 10:30 p.m.

* * * * * *

Severe Thunderstorm Warning
SEVERE THUNDERSTORM WARNING

BULLETIN – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1015 PM CDT SUN AUG 2 2015

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR…
SOUTHEASTERN MCHENRY COUNTY IN NORTHEASTERN ILLINOIS…
NORTHWESTERN COOK COUNTY IN NORTHEASTERN ILLINOIS…
KANE COUNTY IN NORTHEASTERN ILLINOIS…
NORTHERN DUPAGE COUNTY IN NORTHEASTERN ILLINOIS…

* UNTIL 1100 PM CDT

* AT 1015 PM CDT…SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM TROUT VALLEY TO NEAR HAMPSHIRE…MOVING SOUTHEAST AT
40 MPH.

HAZARD…60 MPH WIND GUSTS AND HALF DOLLAR SIZE HAIL.

SOURCE…RADAR INDICATED.

IMPACT…HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE
TO ROOFS…SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE…
CHICAGO…ELGIN…SCHAUMBURG…PALATINE…WHEATON…HOFFMAN
ESTATES…OAK PARK…ELMHURST…LOMBARD…CAROL STREAM…
CARPENTERSVILLE…ADDISON…ST. CHARLES…ALGONQUIN…GLEN ELLYN…
WEST CHICAGO…ROLLING MEADOWS…MAYWOOD…ROSELLE AND VILLA PARK.

INCLUDING THE FOLLOWING INTERSTATES…
I-90 BETWEEN MILE MARKERS 22 AND 37.
I-290 BETWEEN MILE MARKERS 1 AND 16…AND BETWEEN MILE MARKERS 19
AND 22.
I-355 BETWEEN MILE MARKERS 26 AND 30.

THIS INCLUDES…
SCHAUMBURG BOOMERS BASEBALL…ELGIN COMMUNITY COLLEGE…HARPER
COLLEGE…AND KANE COUNTY COUGARS BALLPARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHICAGO .

LARGE HAIL AND DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THESE STORMS. MOVE INDOORS IMMEDIATELY.
LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER…IF YOU CAN
HEAR THUNDER…YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS…AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT…LON 4216 8820 4215 8814 4187 8779 4188 8857
4203 8860 4206 8860 4207 8859 4214 8859
4219 8820
TIME…MOT…LOC 0315Z 298DEG 37KT 4218 8823 4210 8860

HAIL…1.25IN
WIND…60MPH

$$

MTF



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