Tornado Watch 445

Issued

Jun 17, 2009, 2:30 PM MDT (20:30 UTC)

Expired

Jun 17, 2009, 10:00 PM MDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

70 kt

The Cheyenne radar (KCYS), 169 km from the middle of the area, began a volume at 20:30 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

50%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

90%

One or more hailstones of 2 inches or more

60%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1170Jun 17, 11:17 AM MDT
• Mesoscale Discussion 1173Jun 17, 1:29 PM MDT
• Mesoscale Discussion 1180Jun 17, 4:43 PM MDT
• Mesoscale Discussion 1190Jun 17, 9:34 PM MDT

670 
WWUS20 KWNS 172031
SEL5  
SPC WW 172031
COZ000-KSZ000-NEZ000-WYZ000-180400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 445
NWS STORM PREDICTION CENTER NORMAN OK
330 PM CDT WED JUN 17 2009

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

       MUCH OF NORTHEAST COLORADO
       PARTS OF NORTHWEST KANSAS
       PARTS OF SOUTHWEST NEBRASKA INCLUDING SOUTHERN PANHANDLE
       PARTS OF SOUTHEAST WYOMING

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 330 PM UNTIL
1100 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 100 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 10 MILES WEST NORTHWEST OF
FORT COLLINS COLORADO TO 50 MILES SOUTH SOUTHEAST OF BROKEN BOW
NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 439...WW 440...WW
441...WW 442...WW 443...

DISCUSSION...SEVERE THUNDERSTORMS EXPECTED TO DEVELOP RAPIDLY FROM
THE LOW LEVEL CYCLONIC CIRCULATION VICINITY DEN ENEWD ACROSS WATCH
ALONG FRONTAL ZONE IN SWRN NEB.  WITH A VERY TO EXTREMELY UNSTABLE
AIR MASS AND FAVORABLE SHEAR IN PLACE...SUPERCELLS SHOULD DEVELOP
RAPIDLY.  TORNADOES AND VERY LARGE HAIL WILL BE ASSOCIATED WITH THE
SUPERCELLS.

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.


...HALES

Tornado Watches in Nebraska, 2009Tornado Watches in Colorado, 2009Tornado Watches in Kansas, 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.