Tornado Watch 237

Issued

May 5, 2007, 7:22 PM CDT (00:22 UTC)

Expired

May 6, 2007, 4:34 AM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Des Moines radar (KDMX), 116 km from the middle of the area, began a volume at 00:23 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

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 716May 5, 9:16 PM CDT
• Mesoscale Discussion 718May 6, 1:50 AM CDT
• Mesoscale Discussion 720May 6, 4:08 AM CDT

000
WWUS20 KWNS 060022
SEL7  
SPC WW 060022
IAZ000-MOZ000-060700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 237
NWS STORM PREDICTION CENTER NORMAN OK
720 PM CDT SAT MAY 5 2007

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

       WESTERN IOWA
       NORTHWEST MISSOURI

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 720 PM
UNTIL 200 AM 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 50 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF
SPENCER IOWA TO 50 MILES SOUTHWEST OF LAMONI IOWA.  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 232...WW 234...WW
235...WW 236...

DISCUSSION...ISOLATED TSTMS NOW FORMING IN NW MO AND SW IA EXPECTED
TO MOVE/DEVELOP MAINLY NNE THIS EVENING.  STRONGLY BACKED NEAR-SFC
FLOW...DECOUPLING OF LLJ...FAIRLY RICH MOISTURE ENVIRONMENT AND 40
KT DEEP SWLY SHEAR SUGGEST POTENTIAL FOR SUPERCELLS WITH
HAIL/TORNADOES DESPITE LOSS OF DAYTIME HEATING.

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 21040.


...CORFIDI

Tornado Watches in Iowa, 2007Tornado Watches in Missouri, 2007Every tornado watch in 2007

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.