Tornado Watch 520

Issued

Jun 26, 2009, 3:50 PM MDT (21:50 UTC)

Expired

Jun 26, 2009, 10:25 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

70 kt

The North Platte radar (KLNX), 167 km from the middle of the area, began a volume at 21:53 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

30%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1338Jun 26, 2:23 PM MDT
• Mesoscale Discussion 1339Jun 26, 3:35 PM MDT
• Mesoscale Discussion 1345Jun 26, 6:14 PM MDT
• Mesoscale Discussion 1347Jun 26, 7:19 PM MDT

695 
WWUS20 KWNS 262148
SEL0  
SPC WW 262148
COZ000-NEZ000-270400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 520
NWS STORM PREDICTION CENTER NORMAN OK
450 PM CDT FRI JUN 26 2009

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

       PARTS OF NORTHEAST COLORADO
       PARTS OF WESTERN AND CENTRAL NEBRASKA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 450 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2.5 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 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTHEAST OF AKRON
COLORADO TO 15 MILES NORTHWEST OF VALENTINE NEBRASKA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 515...WW 516...WW
517...WW 518...WW 519...

DISCUSSION...SHEAR AND MDT INSTABILITY ARE IN PLACE ACROSS THE WATCH
AREA TO SUPPORT SUPERCELLS ALONG WITH TORNADOES.  CURRENT SEVERE
STORMS WILL DEVELOP/MOVE NEWD FROM NERN CO INTO NEB.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 25020.


...HALES

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