Severe Thunderstorm Watch, Flood Advisory, High Winds Indicated by Bowing Echo (Thunderstorm Line)

Hazardous Weather Outlook
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
503 PM CDT THU MAY 30 2013

The heaviest storms tonight might be out toward Rockford and western areas of northern Illinois. Thunderstorm lines area moving in a north-northeastern direction. The heaviest storms are near Quad Cities and just west of Peoria, heading toward Rockford and areas just west of Rockford. At about 6:14 p.m. a bowing radar echo thunderstorm line indicated very high winds headed for much of northern Illinois. This line of thunderstorms is probably at least three hours away from Arlington Heights and the northwest suburbs.

Arlington Heights and the northwest suburbs are in an area of 2%-5% chance of tornadoes (See US Map Tornado Outlook valid until 6 AM Friday May 31, 2013).

SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 255
NWS STORM PREDICTION CENTER NORMAN OK
550 PM CDT THU MAY 30 2013

SEVERE THUNDERSTORM WATCH 255 IS IN EFFECT UNTIL 100 AM CDT
FOR THE FOLLOWING LOCATIONS

ILLINOIS COUNTIES INCLUDED ARE

COOK DUPAGE FORD
GRUNDY IROQUOIS KANE
KANKAKEE KENDALL LAKE
MCHENRY WILL

WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
503 PM CDT THU MAY 30 2013 /603 PM EDT THU MAY 30 2013/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS…
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE…TONIGHT.

WEATHER HAZARDS EXPECTED:

THUNDERSTORMS…SOME MAY PRODUCE:
STRONG DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
HEAVY RAINFALL POSSIBLY LEADING TO FLASH FLOODING.
HAIL TO ONE INCH.
ISOLATED TORNADOES.

AREAS AFFECTED AND TIMING:

SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS ALL OF NORTHEAST
ILLINOIS AND NORTHWEST INDIANA THROUGH LATE THIS
AFTERNOON…WITH MORE WIDESPREAD THUNDERSTORMS POSSIBLE ONCE
AGAIN LATER THIS EVENING.

DISCUSSION:

SCATTERED THUNDERSTORMS WILL CONTINUE AS LARGE SCALE FORCING
INCREASES FROM THE SOUTH THIS EVENING. ALTHOUGH THE STRONGEST
THUNDERSTORMS CONTINUE ACROSS NORTH CENTRAL ILLINOIS…THE
THREAT FOR SEVERE WEATHER WILL QUICKLY EXPAND ACROSS NORTHEAST
ILLINOIS AND NORTHWEST INDIANA THIS EVENING. THUNDERSTORMS
ACROSS EASTERN IOWA WILL CONTINUE TO SHIFT EAST TOWARDS NORTHERN
ILLINOIS THIS EVENING AND CONTINUE THROUGH NORTHWEST INDIANA
TONIGHT.

PORTIONS OF THE ILLINOIS AND VERMILION RIVERS WILL REMAIN IN
FLOOD.

.DAYS TWO THROUGH SEVEN…FRIDAY THROUGH WEDNESDAY.

ADDITIONAL ROUNDS OF THUNDERSTORMS ARE EXPECTED ACROSS THE AREA
FRIDAY AND FRIDAY NIGHT…AND ACROSS MAINLY CENTRAL AND EASTERN
PARTS OF THE OUTLOOK AREA SATURDAY. SEVERE STORMS ARE POSSIBLE
ACROSS THE ENTIRE AREA FRIDAY AND ACROSS THE EASTERN HALF OF THE
AREA SATURDAY.

HEAVY RAINFALL WILL CONTINUE TO BE POSSIBLE FRIDAY THROUGH
SATURDAY POSSIBLY LEADING TO FLOODING.

PORTIONS OF THE ILLINOIS AND VERMILION RIVERS WILL REMAIN IN
FLOOD. RISES ON OTHER AREA RIVERS ARE POSSIBLE AS WELL.

.SPOTTER INFORMATION STATEMENT…

SPOTTERS WILL LIKELY BE NEEDED THIS EVENING.

Flash Flood Watch
FLOOD WATCH
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
450 PM CDT THU MAY 30 2013

…SEVERAL ROUNDS OF HEAVY RAINFALL POSSIBLE INTO SATURDAY…

ILZ003>006-008-010>014-020>023-033-039-INZ001-002-010-011-019-
310600-
/O.EXA.KLOT.FF.A.0002.130531T0000Z-130602T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-
KENDALL-GRUNDY-WILL-KANKAKEE-IROQUOIS-FORD-LAKE IN-PORTER-NEWTON-
JASPER-BENTON-
INCLUDING THE CITIES OF…ROCKFORD…BELVIDERE…WOODSTOCK…
WAUKEGAN…OREGON…DIXON…DEKALB…AURORA…WHEATON…CHICAGO…
OSWEGO…MORRIS…JOLIET…KANKAKEE…WATSEKA…PAXTON…GARY…
VALPARAISO…MOROCCO…RENSSELAER…FOWLER
450 PM CDT THU MAY 30 2013 /550 PM EDT THU MAY 30 2013/

…FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING…

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS EXPANDED THE

* FLASH FLOOD WATCH TO INCLUDE PORTIONS OF ILLINOIS AND
INDIANA…INCLUDING THE FOLLOWING AREAS…IN ILLINOIS…
BOONE…COOK…DE KALB…DUPAGE…FORD…GRUNDY…IROQUOIS…
KANE…KANKAKEE…KENDALL…LAKE IL…LEE…MCHENRY…OGLE…
WILL AND WINNEBAGO. IN INDIANA…BENTON…JASPER…LAKE IN…
NEWTON AND PORTER.

* THROUGH SATURDAY EVENING.

* SEVERAL ROUNDS OF THUNDERSTORMS POSSIBLY RESULTING IN
WIDESPREAD 2 TO 3 ADDITIONAL INCHES OF RAINFALL INTO SATURDAY
WITH LOCALLY HIGHER AMOUNTS.

* SEVERAL ROUNDS OF THUNDERSTORMS ARE EXPECTED TO AFFECT THE
AREA THROUGH SATURDAY WITH THE MOST LIKELY PERIOD BEING
TONIGHT THROUGH FRIDAY NIGHT. A VERY MOIST ATMOSPHERE WILL
ALLOW THESE STORMS TO DROP HEAVY RAIN OVER SHORT AMOUNTS OF
TIME IN SOME INSTANCES. WITH RECENT HEAVY RAINFALL SATURATING
THE SOIL IN MANY AREAS RUNOFF WILL QUICKLY OCCUR INCREASING
THE POTENTIAL FOR FLASH FLOODING AND CAUSING ADDITIONAL RISES
ON AREA RIVERS.

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.


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