Tornado Watch 607

Issued

Jul 20, 2009, 5:53 PM CDT (22:53 UTC)

Expired

Jul 21, 2009, 2:00 AM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Dodge City radar (KDDC), 159 km from the middle of the area, began a volume at 22:55 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

95%

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

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1628Jul 20, 3:42 PM CDT
• Mesoscale Discussion 1630Jul 20, 6:01 PM CDT
• Mesoscale Discussion 1633Jul 20, 8:26 PM CDT
• Mesoscale Discussion 1636Jul 21, 1:34 AM CDT

981 
WWUS20 KWNS 202300
SEL7  
SPC WW 202300
KSZ000-NEZ000-210700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 607
NWS STORM PREDICTION CENTER NORMAN OK
555 PM CDT MON JUL 20 2009

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

       CENTRAL AND WESTERN KANSAS
       SOUTHWEST NEBRASKA

EFFECTIVE THIS MONDAY AFTERNOON AND TUESDAY MORNING FROM 555 PM
UNTIL 200 AM CDT.

TORNADOES...HAIL TO 2.5 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 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH OF MCCOOK
NEBRASKA TO 45 MILES SOUTH SOUTHEAST OF WICHITA KANSAS.  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 606...

DISCUSSION...TSTMS/SUPERCELLS EXPECTED TO FORM ALONG AND NE OF NW-SE
STNRY FRONT OVER CNTRL KS AS LARGE SCALE ASCENT PERSISTS/POSSIBLY
INCREASES IN ASSOCIATION WITH A SERIES OF IMPULSES MOVING SEWD
WITHIN AMPLIFYING LARGER SCALE TROUGH.  OTHER STORMS/SUPERCELLS
EXPECTED TO CONTINUE MOVING GENERALLY S OR SSE ALONG AND BEHIND COLD
FRONT NOW OVER WRN NEB.

INCREASINGLY MOIST LOW LVL ENVIRONMENT INVOF STNRY FRONT...AND
STRENGTHENING LLJ SUGGEST POTENTIAL FOR TORNADOES...GIVEN DISCRETE
STORMS.  OTHERWISE...COMBINATION OF INCREASING LARGE SCALE ASCENT...
MOISTURE INFLOW...AND MDT SSWLY LLJ SHOULD SUPPORT EVENTUAL
EVOLUTION INTO A LARGE...FORWARD-PROPAGATING MCS.  EMBEDDED BOWING
SEGMENTS/SUPERCELLS MAY POSE A THREAT FOR SVR WIND/HAIL AND PERHAPS
ISOLD TORNADOES INTO LATE TONIGHT/EARLY TUESDAY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 33030.


...CORFIDI

Tornado Watches in Kansas, 2009Tornado Watches in Nebraska, 2009Every tornado watch in 2009

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.