Severe Thunderstorm Warning 340, NWS Norman, OK

OKLAHOMA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
300 PM CDT SAT JUN 14 1986

   A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF NORTHERN
OKLAHOMA UNTIL 9PM THIS EVENING. OTHERWISE THERE IS A CHANCE FOR
THUNDERSTORMS OVER ALL OF OKLAHOMA EXCEPT FOR THE SOUTHEAST.

   WARM MOIST AIR HAS SPREAD ACROSS THE STATE WHILE A WEAK SURFACE
TROUGH EXTENDS FROM NORTHEAST KANSAS TO SOUTHWEST OKLAHOMA.
CONDITIONS IN THE ATMOSPERE ABOVE US ARE CERTAINLY UNSTABLE AND
WILL ENHANCE LIFTING OF THE MOISTURE. THIS SITUATION HAS ALREADY
TRIGGERED THUNDERSTORMS OF WHICH A FEW HAVE BEEN SEVERE.

   THE UPPER LEVEL WINDS ARE NOT VERY STRONG..THUS THE STORMS WILL
NOT MOVE VERY FAST. THIS WILL ALLOW VERY HEAVY RAINFALL TO STAY
OVER AN AREA LONGER THAN NORMAL WHICH COULD CAUSE LOCALIZED FLOODING.
THE SURFACE TEMPERATURES ARE ALSO WARMING INTO THE 90S AND WITH
THE RAIN COOLED AIR FROM THE THUNDERSTORMS.. WINDS COULD REACH 60 TO
70 MP;H.

   WE DO NOT EXPECT TORNADO ACTIVITY..ONLY LARGE HAIL, STRONG WINDS,
AND VERY HEAVY RAINFALL FROM SOME OF THESE THUNDERSTORMS. THE
GREATEST THREAT OF THUNDERSTORMS IS WEST OF A LINE FROM FORT SMITH TO
DURANT.