Severe Storm in Boone County and McHenry County; Cloud Top Headed to Arlington Hts Diminished from 42K to 11K

A severe thunderstorm indicated by radar as a mesocyclone entered McHenry County about 8:59 p.m. Storms are expected to arrive in Arlington Heights, Palatine, Buffalo Grove and other northwest suburbs by 10:10 p.m.

Active weather links: nexrad.chgowx.com (radar) | lot.chgowx.com (NWS Weather Warnings map)

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UPDATE: The initial “X1” Storm has diminished to 11,000 foot top and has a 0 percent chance of hail at 9:42 pm. The more severe storm is tracking toward Kane County.

The “X1” storm radar image indicated the cloud top grew back to 30,000 feet by 10:10 p.m. with 0 (zero) percent chance of severe hail, but a 90 percent chance of hail with a maximum size of .50 inch.

A Severe Thunderstorm Warning was activated at 10:13 p.m. in far northwest Cook County west of Arlington Heights. Cities and villages included in the the Severe Thunderstorm Warning at 10:13 p.m. included Barrington, Carpentersville, Elgin, Hoffman Estates, Inverness, Schaumburg, Sleepy Hollow, Streamwood and West Dundee.

The trailing edge of the storms have passed the area and have diminished to minimal rain shower except in Elgin, Hoffman Estates, and the Elburn and Kaneville area where possible severe thunderstorms are still indicated.

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The storm (X1) was indicated by radar to have a cloud top of 42,000 feet with a 30% chance of severe hail with maximum hail size of 1.25 inch. At 9:00 p.m. there was a 100 percent chance of hail. The estimated time of arrival (ETA) to Palatine Road in Arlington is calculated 70 miles away at 8:59 p.m. — traveling at 39 knots, the storm would arrive in 69 minutes, or at 10:08 p.m.

At 9:12 p.m. the storm decreased to 40,000 foot cloud tops.

At 9:22 p.m. an adjacent cloud top to the west of the above storm mentioned is estimated at 42,000 feet with a 50 percent chance of severe hail with a maximum hail size of 1.75 inch.

Trained spotters spotted a funnel cloud — reported sighted in Boone County about 3 miles north of IL-76 and IL-173 with quarter size hail. However no Tornado Warning was activated by the National Weather Service.

This storm is heading toward the northwest suburbs.

SEVERE THUNDERSTORM WARNING
ILC007-111-201-140230-
/O.NEW.KLOT.SV.W.0102.150714T0151Z-150714T0230Z/

BULLETIN – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
851 PM CDT MON JUL 13 2015

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR…
NORTHERN BOONE COUNTY IN NORTH CENTRAL ILLINOIS…
NORTHERN MCHENRY COUNTY IN NORTHEASTERN ILLINOIS…
NORTHEASTERN WINNEBAGO COUNTY IN NORTH CENTRAL ILLINOIS…

* UNTIL 930 PM CDT

* AT 851 PM CDT…SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM LAKE GENEVA TO NEAR SHARON TO 6 MILES NORTH OF
CALEDONIA TO NEAR SOUTH BELOIT…MOVING SOUTHEAST AT 30 MPH.

HAZARD…60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE…RADAR INDICATED.

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

* SEVERE THUNDERSTORMS WILL BE NEAR…
HARVARD AROUND 900 PM CDT.
POPLAR GROVE AND HEBRON AROUND 905 PM CDT.
RICHMOND AND CAPRON AROUND 910 PM CDT.
WONDER LAKE AND GREENWOOD AROUND 915 PM CDT.
SPRING GROVE AND RINGWOOD AROUND 920 PM CDT.
WOODSTOCK AND TIMBERLANE AROUND 925 PM CDT.

INCLUDING THE FOLLOWING INTERSTATE…
I-90 BETWEEN MILE MARKERS 0 AND 2…AND BETWEEN MILE MARKERS 66 AND
76.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT FOR NORTHEASTERN
ILLINOIS.

LAT…LON 4249 8820 4247 8820 4230 8849 4228 8872
4234 8916 4250 8913
TIME…MOT…LOC 0151Z 322DEG 24KT 4259 8840 4248 8868 4245 8888 4251
8909

HAIL…1.00IN
WIND…60MPH

$$

IZZI


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INITIAL HEADLINE …
Severe Storm in Boone County and McHenry County; Funnel Cloud Sighted in Boone County Near Route 173 Headed Toward Northwest Suburbs in Cook County