Tornado Watch 113

Issued

Apr 30, 2010, 1:05 PM CDT (18:05 UTC)

Expired

Apr 30, 2010, 10:00 PM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Milwaukee radar (KMKX), 86 km from the middle of the area, began a volume at 18:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 419Apr 30, 9:18 AM CDT
• Mesoscale Discussion 420Apr 30, 12:01 PM CDT
• Mesoscale Discussion 421Apr 30, 12:41 PM CDT
• Mesoscale Discussion 423Apr 30, 1:22 PM CDT
• Mesoscale Discussion 424Apr 30, 2:08 PM CDT
• Mesoscale Discussion 425Apr 30, 2:41 PM CDT
• Mesoscale Discussion 426Apr 30, 4:59 PM CDT
• Mesoscale Discussion 427Apr 30, 5:37 PM CDT
• Mesoscale Discussion 429Apr 30, 7:12 PM CDT
• Mesoscale Discussion 431Apr 30, 7:32 PM CDT

909 
WWUS20 KWNS 301810
SEL3
SPC WW 301810
IAZ000-ILZ000-WIZ000-LMZ000-010100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 113
NWS STORM PREDICTION CENTER NORMAN OK
105 PM CDT FRI APR 30 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       EASTERN IOWA
       NORTHWESTERN ILLINOIS
       SOUTHERN AND EASTERN WISCONSIN
       LAKE MICHIGAN

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 105 PM UNTIL 800
PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF GREEN
BAY WISCONSIN TO 40 MILES EAST OF BURLINGTON IOWA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 111...WW 112...

DISCUSSION...STRONG UPPER FORCING WILL OVERSPREAD THE AREA THIS
AFTERNOON... WITH THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER AND
INTENSITY FROM SOUTHWEST TO NORTHEAST ACROSS THE WW. A WARMING AND
MOISTENING BOUNDARY LAYER HAS RESULTED IN MODERATE INSTABILITY...
AND IN CONJUNCTION WITH 50 KT OF DEEP LAYER SHEAR...SUPERCELLS ARE
EXPECTED. STRONG LOW LEVEL SHEAR WILL SUPPORT A THREAT FOR
TORNADOES...AND THE STRONG FLOW ALOFT WILL FAVOR FAST MOVING BOW
ECHOES WITH WIND DAMAGE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 23050.


...IMY

Tornado Watches in Wisconsin, 2010Tornado Watches in Illinois, 2010Tornado Watches in Iowa, 2010Every tornado watch in 2010

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.