Tornado Watch 327

Issued

May 22, 2011, 2:04 PM CDT (19:04 UTC)

Expired

May 22, 2011, 11:29 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), 75 km from the middle of the area, began a volume at 19:06 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

60%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

30%

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

40%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 849May 22, 10:53 AM CDT
• Mesoscale Discussion 855May 22, 1:49 PM CDT
• Mesoscale Discussion 858May 22, 2:59 PM CDT
• Mesoscale Discussion 863May 22, 4:16 PM CDT
• Mesoscale Discussion 866May 22, 5:47 PM CDT
• Mesoscale Discussion 873May 22, 7:42 PM CDT
• Mesoscale Discussion 877May 22, 9:35 PM CDT

543 
WWUS20 KWNS 221904
SEL7
SPC WW 221904
ILZ000-INZ000-WIZ000-LMZ000-230300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 327
NWS STORM PREDICTION CENTER NORMAN OK
205 PM CDT SUN MAY 22 2011

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

       NORTHERN ILLINOIS
       NORTHWEST INDIANA
       CENTRAL AND EASTERN WISCONSIN
       LAKE MICHIGAN

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 205 PM UNTIL
1000 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 45 MILES NORTHEAST OF WAUSAU
WISCONSIN TO BLOOMINGTON ILLINOIS.  FOR A COMPLETE DEPICTION OF
THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
WOU7).

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 322...WW 323...WW
324...WW 325...WW 326...

DISCUSSION...TSTMS ARE EXPECTED TO MOVE INTO THE AREA FROM THE WEST
AND SOUTH THIS AFTERNOON AS THE CONTINUED WARMING AND MOISTENING OF
THE BOUNDARY LAYER SUPPORTS MLCAPE VALUES OF 1000-2000 J/KG.  18Z
DVN/ILX SOUNDINGS SHOWED DEEP-LAYER SHEAR OF AROUND 40 KT AND
EFFECTIVE SRH VALUES OF 150-200 M2/S2.  AS SUCH...THE POTENTIAL WILL
EXIST FOR SUPERCELLS CAPABLE OF LARGE HAIL...DAMAGING WINDS AND
TORNADOES.

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 24030.


...MEAD

Tornado Watches in Wisconsin, 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.