Severe Thunderstorm Warning 221, NWS Norman, OK

OKC004>021-161200-

OKLAHOMA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
100 PM CDT FRI MAY 15 1992

THIS THUNDERSTORM OUTLOOK APPLIES ONLY TO OKLAHOMA ZONES 4 THROUGH 21.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
AND TONIGHT ACROSS ALL OF CENTRAL...WESTERN...AND SOUTHERN OKLAHOMA.

EARLY THIS AFTERNOON...A WEAK FRONTAL BOUNDARY WAS LOCATED ACROSS
NORTHCENTRAL OKLAHOMA AND EXTENDED NORTHWEST INTO WESTERN KANSAS. WARM
AND MOIST AIR WAS PRESENT ACROSS WESTERN...CENTRAL...AND SOUTHERN
OKLAHOMA. LIGHT SOUTHERLY WINDS WERE CONTINUING TO INCREASE THE AMOUNT
OF LOW-LEVEL MOISTURE ACROSS THE REGION WITH WIND SPEEDS EXPECTED TO
INCREASE DURING THE AFTERNOON AS LOW PRESSURE INTENSIFIES ACROSS THE
CENTRAL PLAINS. THIS WILL INCREASE THE CONVERGENCE ALONG THE WEAK FRONT
IN NORTHCENTRAL OKLAHOMA. SEVERAL WEAK OUTFLOW BOUNDARIES WERE ALSO
PRESENT ACROSS THE AREA THIS AFTERNOON...THE REMNANTS OF THUNDERSTORMS
LAST EVENING AND OVERNIGHT.

AFTERNOON HEATING OF THE UNSTABLE AIR MASS COMBINED WITH THE
FRONT...OUTFLOW BOUNDARIES...AND THE EFFECTS OF THE HIGHER TERRAIN IN
SOUTHEAST OKLAHOMA WILL RESULT IN THE DEVELOPMENT OF SCATTERED
THUNDERSTORMS THIS AFTERNOON AND EVENING. IN ADDITION...THUNDERSTORMS
THAT WILL DEVELOP ACROSS WEST TEXAS THIS AFTERNOON COULD MOVE SLOWLY
INTO WESTERN OKLAHOMA.

WINDS ALOFT ACROSS THE AREA ARE RELATIVELY WEAK THIS AFTERNOON. A WIND
PROFILE OF THIS NATURE FAVORS THE DEVELOPMENT OF SLOW-MOVING STORMS THAT
BRIEFLY INTENSIFY AND THEN RAPIDLY WEAKEN. DURING THE INTENSE PHASE
THUNDERSTORMS THIS AFTERNOON AND EVENING WILL BE CAPABLE OF PRODUCING
LARGE HAIL AND TORRENTIAL RAINFALL. LOCALIZED VERY STRONG WINDS ARE ALSO
POSSIBLE DURING THE RAPID WEAKENING PHASE OF THE THUNDERSTORMS.

ALTHOUGH WIDESPREAD SEVERE THUNDERSTORMS ARE NOT EXPECTED THIS AFTERNOON
AND EVENING...SPOTTER GROUPS ACROSS WESTERN...CENTRAL...AND SOUTHERN
OKLAHOMA SHOULD BE PREPARED FOR ACTIVATION SHOULD THUNDERSTORMS DEVELOP
IN THE VICINITY.