Severe Thunderstorm Watch 85

Issued

Apr 12, 2002, 10:00 AM CDT (15:00 UTC)

Expired

Apr 12, 2002, 3:00 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

The Altus AFB radar (KFDR), 67 km from the middle of the area, began a volume at 15:01 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.

000 
WWUS20 KWNS 121444
SEL5  
SPC WW 121439
OKZ000-TXZ000-122000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 85
STORM PREDICTION CENTER NORMAN OK
939 AM CDT FRI APR 12 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   SOUTHERN OKLAHOMA                           
   NORTH TEXAS                              

EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1000 AM UNTIL 300
PM CDT.

HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 75 MILES NORTH NORTHWEST OF ABILENE
TEXAS TO 15 MILES EAST NORTHEAST OF DURANT OKLAHOMA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.


DISCUSSION...AREA OF STRONG/ISOLATED SEVERE THUNDERSTORMS DURING
MORNING SWRN OK/ERN TX PANHANDLE EXPECTED TO INCREASE AND INTENSIFY
AS THEY MOVE SEWD ACROSS SURFACE BOUNDARY VICINTY RED RIVER. 
AIRMASS IN N TX WILL RAPIDLY DESTABILIZE UNDER STRONG SURFACE
HEATING...WITH LITTLE CAP REMAINING BY 18Z.  WITH CAPES OF 2500
J/KG AND STEEP LAPSE RATES...PRIMARY THREAT WILL BE LARGE HAIL WITH
STORMS POSSIBLY EVOLVING INTO SHORT LINES...INCREASING WIND DAMAGE
THREAT ACROSS N TX.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 31025.


...HALES

343,1001 350,0960 325,0960 322,1001

WWUS20 KWNS 121444
SEL5  
SPC WW 121439
OKZ000-TXZ000-122000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 85
STORM PREDICTION CENTER NORMAN OK
939 AM CDT FRI APR 12 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   SOUTHERN OKLAHOMA                           
   NORTH TEXAS                              

EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1000 AM UNTIL 300
PM CDT.

HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 75 MILES NORTH NORTHWEST OF ABILENE
TEXAS TO 15 MILES EAST NORTHEAST OF DURANT OKLAHOMA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.


DISCUSSION...AREA OF STRONG/ISOLATED SEVERE THUNDERSTORMS DURING
MORNING SWRN OK/ERN TX PANHANDLE EXPECTED TO INCREASE AND INTENSIFY
AS THEY MOVE SEWD ACROSS SURFACE BOUNDARY VICINTY RED RIVER. 
AIRMASS IN N TX WILL RAPIDLY DESTABILIZE UNDER STRONG SURFACE
HEATING...WITH LITTLE CAP REMAINING BY 18Z.  WITH CAPES OF 2500
J/KG AND STEEP LAPSE RATES...PRIMARY THREAT WILL BE LARGE HAIL WITH
STORMS POSSIBLY EVOLVING INTO SHORT LINES...INCREASING WIND DAMAGE
THREAT ACROSS N TX.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 31025.


...HALES

343,1001 350,0960 325,0960 322,1001

Severe Thunderstorm Watches in Texas, 2002Severe Thunderstorm Watches in Oklahoma, 2002Every severe thunderstorm watch in 2002

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.