Severe Thunderstorm Warning 99, NWS Norman, OK

OKLAHOMA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
315 PM CDT THU MAY 21 1987

A MODERATE RISK OF SEVERE THUNDERSTORMS EXISTS OVER PORTIONS OF
NORTHERN AND EASTERN OKLAHOMA THIS AFTERNOON AND TONIGHT. THE MODERATE
RISK AREA COVERS THAT PORTION OF OKLAHOMA NORTH AND EAST OF A PONCA
CITY...OKLAHOMA CITY...FORT SMITH AR LINE. THERE IS A SLIGHT RISK
OF SEVERE THUNDERSTORMS OVER PORTIONS OF SOUTHERN OKLAHOMA. THE SLIGHT
RISK AREA LIES EAST OF AN ALTUS...OKLAHOMA CITY LINE AND WEST OF A
DURANT...FORT SMITH AR LINE...AND BORDERS THE MODERATE RISK AREA TO THE
NORTH.

AT MIDAFTERNOON...A STATIONARY FRONT EXTENDS ALONG A LINE FROM PONCA
CITY TO CHILDRESS TX. A DRY LINE EXTENDS FROM THE FRONT NEAR OKLAHOMA
CITY SOUTHWARD INTO NORTH TEXAS TO THE WEST OF ABILENE. THE LOCATION
WHERE THE FRONT AND DRYLINE INTERSECT IS CALLED A 'TRIPLE POINT' BY
METEOROLOGISTS...AND IS OFTEN A FOCUS FOR SEVERE WEATHER DEVELOPMENT.
LOW LEVEL MOISTURE COVERS THE SOUTHEASTERN TWO-THIRDS OF THE STATE AHEAD
OF THE FRONT AND DRYLINE.

UPPER AIR INFORMATION RECEIVED AROUND 2 PM FROM SOUTH CENTRAL
OKLAHOMA INDICATES THE ATMOSPHERE IS NOT QUITE AS EXPLOSIVELY
UNSTABLE AS IT WAS EARLIER TODAY. HOWEVER...THUNDERSTORM ACTIVITY
IS STARTING TO FIRE UP ALONG THE COLD FRONT TO OUR NORTHEAST IN
MISSOURI...AND TO OUR SOUTH IN TEXAS ALONG THE DRYLINE. SUFFICIENT
INSTABILITY STILL EXISTS OVER OKLAHOMA...AND THUNDERSTORMS ARE
EXPECTED TO DEVELOP ALONG THE COLD FRONT AND/OR DRYLINE BY 4 PM.

THE POTENTIAL REMAINS FOR A SIGNIFICANT OUTBREAK OF SEVERE
WEATHER OVER PORTIONS OF THE STATE THIS AFTERNOON AND TONIGHT.
THE BEST CHANCE FOR SEVERE WEATHER EXISTS NEAR THE TRIPLE POINT...BUT
SEVERE ACTuIVITY CANNOT BE RULED OUT ANYWHERE IN OKLAHOMA NEAR THE FRONT
OR DRYLINE.

CIVIL DEFENSE AND STORM SPOTTER GROUPS IN THE OUTLOOK AREA SHOULD
EXPECT TO BE ACTIVATED BY LATE AFTERNOON.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA FALLS TX
525 PM CDT THU MAY 21 1987

AT 520 PM THE WICHITA FALLS NATIONAL WEATHER RADAR SHOWED A BAND
OF THUNDERSTORMS A FEW PRODUCING VERY HEAVY RAIN DEVELOPING FROM VERNON
TO JUST NORTH OF ABILENE. THE HEAVIEST RAINS WERE FALLING JUST WEST
OF LAKE KEMP AND TO THE SOUTHWEST OF SEYMOUR.

THESE STORMS WERE MOVING TO THE NORTHEAST AT 15 TO 20 MPH.

AT PRESENT NO SEVERE WEATHER WAS INDICATED IN ASSOCIATION WITH THESE
STORMS. HOWEVER THE POTENTIAL FOR SEVERE WEATHER DOES EXIST ACROSS
THE AREA THIS AFTERNOON. THE STORMS COULD POSSIBLY INTENSITY.
RESIDENTS ARE ADVISED TO STAY TUNED TO NOAA WEATHER RADIO OR COMMERCIAL
RADIO AND T.V. FOR LATER STATEMENTS AND POSSIBLE WARNINGS.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA FALLS TX
525 PM CDT THU MAY 21 1987

AT 520 PM THE WICHITA FALLS NATIONAL WEATHER RADAR SHOWED A BAND
OF THUNDERSTORMS A FEW PRODUCING VERY HEAVY RAIN DEVELOPING FROM VERNON
TO JUST NORTH OF ABILENE. THE HEAVIEST RAINS WERE FALLING JUST WEST
OF LAKE KEMP AND TO THE SOUTHWEST OF SEYMOUR.

THESE STORMS WERE MOVING TO THE NORTHEAST AT 15 TO 20 MPH.

AT PRESENT NO SEVERE WEATHER WAS INDICATED IN ASSOCIATION WITH THESE
STORMS. HOWEVER THE POTENTIAL FOR SEVERE WEATHER DOES EXIST ACROSS
THE AREA THIS AFTERNOON. THE STORMS COULD POSSIBLY INTENSIFY.
RESIDENTS ARE ADVISED TO STAY TUNED TO NOAA WEATHER RADIO OR COMMERCIAL
RADIO AND T.V. FOR LATER STATEMENTS AND POSSIBLE WARNINGS.

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