Tornado Watch 672

Issued

Sep 19, 2007, 1:38 PM MDT (19:38 UTC)

Expired

Sep 19, 2007, 7:16 PM MDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Goodland radar (KGLD), 51 km from the middle of the area, began a volume at 19:38 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

10%

Ten or more severe wind reports

10%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1981Sep 19, 1:12 PM MDT
• Mesoscale Discussion 1982Sep 19, 5:02 PM MDT

000
WWUS20 KWNS 191940
SEL2  
SPC WW 191940
COZ000-KSZ000-200200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 672
NWS STORM PREDICTION CENTER NORMAN OK
240 PM CDT WED SEP 19 2007

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

       EXTREME EASTERN COLORADO
       WESTERN KANSAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
900 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 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHWEST OF
BURLINGTON COLORADO TO 55 MILES SOUTH SOUTHEAST OF HILL CITY
KANSAS.  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...SCATTERED THUNDERSTORMS ARE DEVELOPING IN THE WARM
SECTOR /S OF A WARM FRONT S OF I-70/ AS SURFACE TEMPERATURES WARM
INTO THE 80S AND REMOVE CONVECTIVE INHIBITION.  EXPECT THE THREAT
FOR ADDITIONAL STORM DEVELOPMENT TO SPREAD NWD ACROSS ERN CO/WRN KS
AS THE WARM FRONT LIFTS NWD THROUGH THE AFTERNOON.  MODERATE
INSTABILITY ALONG AND S OF THE BOUNDARY...AND EFFECTIVE BULK SHEAR
OF 35-50 KT...WILL SUPPORT SUPERCELLS CAPABLE OF PRODUCING LARGE
HAIL.  A COUPLE OF TORNADOES WILL ALSO BE POSSIBLE THIS AFTERNOON
ALONG THE FRONTAL ZONE...WHERE LOW-LEVEL SHEAR AND MOISTURE WILL BE
MAXIMIZED.

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 25020.


...THOMPSON

Tornado Watches in Kansas, 2007Tornado Watches in Colorado, 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.