Tornado Watch 453

Issued

Jun 9, 2011, 3:05 PM CDT (20:05 UTC)

Expired

Jun 9, 2011, 10:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

70 kt

The Topeka radar (KTWX), 124 km from the middle of the area, began a volume at 20:03 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

60%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

90%

One or more hailstones of 2 inches or more

70%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1155Jun 9, 2:13 PM CDT
• Mesoscale Discussion 1163Jun 9, 7:43 PM CDT

968 
WWUS20 KWNS 092011
SEL3
SPC WW 092011
IAZ000-KSZ000-MOZ000-NEZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 453
NWS STORM PREDICTION CENTER NORMAN OK
305 PM CDT THU JUN 9 2011

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

       FAR SOUTHERN IOWA
       NORTHEASTERN KANSAS
       NORTHWESTERN MISSOURI
       SOUTHEASTERN NEBRASKA

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 305 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHWEST OF
MANHATTAN KANSAS TO 55 MILES EAST OF CHILLICOTHE MISSOURI.  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 450...WW 451...WW 452...

DISCUSSION...A FRONTAL BOUNDARY EXTENDED FROM NERN KS SWWD INTO
SOUTH CENTRAL KS WITH A WEAK SURFACE LOW LOCATED NEAR SLN. STORMS
ARE EXPECTED TO DEVELOP DURING THE NEXT HOUR OR SO AS CONVERGENCE
INCREASES AHEAD OF THE NEWD MOVING LOW. OTHER STORMS SHOULD ALSO
DEVELOP ALONG OUTFLOW BOUNDARIES LOCATED ACROSS NWRN MO. THE AIR
MASS ACROSS THE WATCH AREA IS STRONGLY UNSTABLE AND DEEP LAYER SHEAR
IS SUFFICIENT FOR INTENSE SUPERCELLS. WHILE LARGE HAIL WILL BE THE
MAIN THREAT ...VEERING WIND PROFILES IN THE LOWER 1-2 KM AND THE
MOIST BOUNDARY LAYER WOULD ALSO BE SUPPORTIVE OF TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 24030.


...IMY

Tornado Watches in Missouri, 2011Tornado Watches in Kansas, 2011Tornado Watches in Nebraska, 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.