Severe Thunderstorm Warning 21, NWS Norman, OK

OKLAHOMA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
100 PM CST MON MAR 28 1988

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING OVER SOUTHWESTERN OKLAHOMA... SOUTH AND WEST OF A HOLLIS..
HOBART.. CHICKASHA.. MARIETTA LINE. A SLIGHT RISK OF SEVERE WEATHER
ALSO EXISTS THIS AFTERNOON AND EARLY TONIGHT OVER MOST OF THE REST OF
SOUTHERN AND EASTERN OKLAHOMA... SOUTHEAST OF A HOLLIS TO BLACKWELL
LINE AND NORTHWEST OF A HUGO TO STILWELL LINE.

AT MIDDAY A STRONG COLD FRONT WAS MOVING SOUTHEASTWARD THROUGH
NORTHERN AND WESTERN OKLAHOMA. WARM MOIST AND UNSTABLE AIR PREVAILED
AHEAD OF THE FRONT ALONG WITH CONTINUED STRONG SOUTH WINDS. CLOUD
COVER AND SCATTERED SHOWERS AND THUNDERSTORMS DEVELOPED THIS MORNING
OVER CENTRAL OKLAHOMA IN RESPONSE TO A WEAK UPPER LEVEL DISTURBANCE
MOVING OVER THE UNSTABLE AIR. THIS CLOUD COVER IS PREVENTING
DESTABILIZATION THIS AFTERNOON AHEAD OF THE COLD FRONT OVER CENTRAL
AND EASTERN OKLAHOMA... BUT BREAKS HAVE DEVELOPED OVER PARTS OF
SOUTHWEST OKLAHOMA ALLOWING MORE RAPID DESTABILIZATION.

THE WEAK UPPER DISTURBANCE OVER SOUTHERN OKLAHOMA EARLY THIS
AFTERNOON WILL MOVE EASTWARD THROUGH THIS EVENING... MAINTAINING
SHOWERS AND THUNDERSTORMS OVER EASTERN SECTIONS OF THE STATE.
HOWEVER CLOUD COVER IS EXPECTED TO MINIMIZE THE AMOUNT OF INSTABILITY
OVER EASTERN OKLAHOMA AND LIMIT THE POTENTIAL FOR SEVERE WEATHER WITH
THESE STORMS. FURTHER WEST... THE COLD FRONT IS EXPECTED TO SLOW DOWN
AS IT MOVES INTO CENTRAL OKLAHOMA DURING THE AFTERNOON. THUNDERSTORMS
MAY REDEVELOP ALONG THE FRONT DURING MAXIMUM HEATING. SOME OF THESE
STORMS MAY BECOME SEVERE... WITH THE MOST LIKELY AREA FOR SEVERE
DEVELOPMENT IN SOUTHWEST OKLAHOMA WHERE THE AFTERNOON SUN WILL
RESULT IN MAXIMUM INSTABILITY. COOLER AND DRIER AIR MOVING INTO
NORTHWESTERN OKLAHOMA BEHIND THE COLD FRONT WILL ELIMINATE THE
THREAT OF ANY SEVERE WEATHER OVER MOST OF NORTHWESTERN OKLAHOMA.

ANOTHER STRONGER DISTURBANCE MOVING OUT OF THE ROCKIES WILL KEEP A
CHANCE OF THUNDERSTORMS WELL INTO THE NIGHT OVER MUCH OF EASTERN
OKLAHOMA. MOISTURE LEVELS ARE EXPECTED TO REMAIN VERY HIGH...
RESULTING IN THE POSSIBILITY OF FLOODING TONIGHT ALONG AND> AHEAD
OF THE FRONT. THE FLOODING POTENTIAL WILL BE GREATEST TO THE EAST
OF A GRANFIELD TO GUTHRIE TO FORAKER LINE.

SPOTTER NETWORKS MAY REQUIRE ACTIVATION IN PARTS OF SOUTHWESTERN
OKLAHOMA LATER THIS AFTERNOON.