Tornado Watch 82

Issued

Apr 3, 2011, 5:57 PM CDT (22:57 UTC)

Expired

Apr 4, 2011, 12:00 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

65 kt

The Quad Cities radar (KDVN), 91 km from the middle of the area, began a volume at 22:59 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

40%

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

80%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 327Apr 3, 4:49 PM CDT
• Mesoscale Discussion 330Apr 3, 7:44 PM CDT
• Mesoscale Discussion 334Apr 3, 10:23 PM CDT
• Mesoscale Discussion 335Apr 3, 10:50 PM CDT

516 
WWUS20 KWNS 032256
SEL2
SPC WW 032256
IAZ000-ILZ000-MOZ000-WIZ000-040500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 82
NWS STORM PREDICTION CENTER NORMAN OK
600 PM CDT SUN APR 3 2011

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

       EASTERN IOWA
       WESTERN AND NORTHERN ILLINOIS
       EXTREME NORTHEAST MISSOURI
       FAR SOUTHERN WISCONSIN

EFFECTIVE THIS SUNDAY NIGHT FROM 600 PM UNTIL MIDNIGHT CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF
OTTUMWA IOWA TO 35 MILES EAST NORTHEAST OF DUBUQUE IOWA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

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.

DISCUSSION...THUNDERSTORMS HAVE BEGUN TO FORM ALONG THE COLD FRONT
OVER IA.  THESE STORMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THROUGH THE EVENING HOURS AND SPREAD INTO WESTERN IL.
LARGE HAIL AND DAMAGING WINDS ARE THE MAIN THREATS.  HOWEVER...THE
POTENTIAL EXISTS FOR ISOLATED TORNADOES ESPECIALLY NEAR THE SURFACE
WARM FRONT OVER NORTHERN IL OR PERHAPS FAR SOUTHERN WI.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26040.


...HART

Tornado Watches in Iowa, 2011Tornado Watches in Illinois, 2011Every tornado watch in 2011

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.