Severe Thunderstorm Warning 82, NWS Norman, OK

OKLAHOMA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
300 PM CST SAT APR 5 1986

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THAT PART OF SOUTH
CENTRAL OKLAHOMA BOUNDED BY A LINE EXTENDING FROM DURANT TO SEMINOLE
TO WAURIKA THIS AFTERNOON AND EVENING. ANY THUNDERSTORMS WHICH REACH
SEVERE LIMITS WILL BE MARGINALLY SEVERE..WITH HAIL UP TO 3/4 INCH IN
DIAMETER..AND WILL LAST ONLY A SHORT TIME.

WIDELY SCATTERED THUNDERSTORMS CAN BE EXPECTED TO DEVELOP OVER MOST OF
THE SOUTHEASTERN TWO THIRDS OF OKLAHOMA..GENERALLY SOUTHEAST OF A LINE
FROM BARTLESVILLE TO ELK CITY. ALL OF THE THUNDERSTORM ACTIVITY CAN BE
EXPECTED TO DECREASE IN INTENSITY A FEW HOURS AFTER SUNSET AND TO
DISSIPATE BY MIDNIGHT.

THE WEAK PACIFIC COLD FRONT WHICH MOVED ACROSS MOST OF OKLAHOMA
YESTERDAY HAS BEGUN TO MOVE NORTHWARD AND EXTENDS FROM NEAR NOWATA
TO NEAR VINSON. VERY MOIST AIR HAS MOVED NORTHWARD FROM TEXAS DURING
THE PAST FEW HOURS AND COVERS THAT PART OF OKLAHOMA SOUTH OF THE OLD
FRONT. THE ATMOSPHERE HAS WARMED AND STABILIZED IN THE MID LEVELS
SINCE YESTERDAY..SO THE THUNDERSTORMS WHICH DEVELOP HAVE LESS
CHANCE OF BECOMING SEVERE THAN THOSE OF THE PAST TWO DAYS.

A WEAK OUTFLOW BOUNDARY FROM THUNDERSTORM ACTIVITY WHICH WAS OVER
NORTHEASTERN TEXAS LAST NIGHT EXTENDS FROM CENTRAL TEXAS TO SOUTH
CENTRAL OKLAHOMA AND HAS ACTED TO FOCUS THUNDERSTORM ACTIVITY THIS
AFTERNOON. ALSO ASSISTING IN THUNDERSTORM DEVELOPMENT IS A WEAK UPPER
LEVEL COLD POCKET WHICH IS MOVING OVER CENTRAL OKLAHOMA THIS AFTER-
NOON. THE UPPER LEVEL WINDS ARE RELATIVELY WEAK TODAY..AND THE
THUNDERSTORMS ARE BEING DRIVEN LARGELY BY INSTABILITY RESULTING FROM
HEATING OF THE MOIST AIR IN THE LOWER PART OF THE ATMOSPHERE BY THE
SUN. THUS..MOST OF THE THUNDERSTORMS WILL DEVELOP AND DISSIPATE
IN LESS THAN AN HOUR. OUTFLOW BOUNDARIES FROM PREVIOUS STORMS WILL
FOCUS NEW DEVELOPMENT MAINLY OVER SOUTH CENTRAL AND CENTRAL OKLAHOMA
THIS AFTERNOON AND EVENING..ALTHOUGH THUNDERSTORMS ARE POSSIBLE
ANYWHERE IN THE MOIST AIR.

THE POTENTIAL FOR SEVERE DEVELOPMENT IS NOT HIGH ENOUGH TO MERIT
ACTIVATION OF ANY SPOTTER NETWORKS IN OKLAHOMA.

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