Severe Thunderstorm Warning 60, NWS Tulsa, OK

FPUS3 KTUL 070014
AFDTUL

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
710 PM CDT MON APR 6 1998

UPDATED ZONES MAINLY TO ADD HEADLINE AND EDGE POP UPWARDS IN 4 SE OK
COUNTIES UNDER TORNADO WATCH.

FCSTID = 26
TUL   55  77  54  68 /  60   0  10  30
FSM   53  78  49  71 /  70  10  10  20
MLC   53  79  51  70 /  70   0  10  20
BVO   52  73  50  66 /  60   0  10  40
FYV   54  72  46  67 /  70  10  10  40
IDB   56  82  51  74 /  70   0  10  10
BYV   54  72  46  67 /  70  10  10  40
MIO   53  74  49  66 /  70  10  10  40
MKO   55  77  54  68 /  60   0  10  30
F10   55  77  54  68 /  60   0  10  30
HHW   56  82  51  74 /  70   0  10  10

.TUL...
OK...NONE.
AR...NONE.

ARZ001-002-010-011-019-020-029-OKZ049-053>076-071200-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE TULSA OK
600 PM CDT MON APR 6 1998

A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN OKLAHOMA AND
NORTHWEST ARKANSAS TONIGHT.

EARLY THIS EVENING A SURFACE LOW PRESSURE SYSTEM WAS INTENSIFYING OVER
THE PANHANDLES AND SOUTHWEST KANSAS WITH A DRYLINE EXTENDING SOUTHWARD
NEAR THE TEXAS AND FAR WESTERN OKLAHOMA STATE LINE.  MEANWHILE...A
STRONG UPPER LEVEL WEATHER SYSTEM CONTINUED TO SWING OUT INTO THE
PLAINS.

STRONG TO SEVERE THUNDERSTORMS HAVE DEVELOPED OVER WESTERN OKLAHOMA
AND NORTHWEST TEXAS NEAR THE RED RIVER.  ADDITIONAL STORMS ARE EXPECTED
TO DEVELOP ALONG AND AHEAD OF THE DRYLINE DURING THE EVENING...WITH THE
STORMS EVENTUALLY FORMING INTO A SQUALL LINE.  A TORNADO WATCH IS IN
EFFECT FOR MUCH OF THE WESTERN HALF OF OKLAHOMA EARLY THIS EVENING AND
ADDITIONAL WATCHES ARE LIKELY LATER ON AS THE SQUALL LINE FORMS AND
MOVES TO THE EAST.

THE SQUALL LINE IS EXPECTED TO MOVE INTO EASTERN OKLAHOMA BETWEEN
9 PM AND MIDNIGHT...REACHING A TULSA TO MCALESTER LINE BY AROUND
MIDNIGHT...THEN MOVE ON INTO NORTHWEST ARKANSAS AFTER MIDNIGHT.

THE MAIN THREAT FROM SEVERE THUNDERSTORMS ALONG THE SQUALL LINE WILL
BE DAMAGING STRAIGHT LINE WINDS AND LARGE HAIL.  THERE IS ALSO SOME
POTENTIAL FOR A FEW WIDELY SCATTERED SUPERCELL THUNDERSTORMS OUT AHEAD
OF THE SQUALL LINE THIS EVENING.  ANY SUPERCELL STORMS WILL BRING AN
INCREASED THREAT OF TORNADOES...MAINLY FOR EASTERN OKLAHOMA.

EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS SHOULD BE
PREPARED FOR ACTIVATION TONIGHT.

ARZ001-002-010-011-019-020-029-OKZ049-053>076-071200-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE TULSA OK
600 PM CDT MON APR 6 1998

A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN OKLAHOMA AND
NORTHWEST ARKANSAS TONIGHT.

EARLY THIS EVENING A SURFACE LOW PRESSURE SYSTEM WAS INTENSIFYING OVER
THE PANHANDLES AND SOUTHWEST KANSAS WITH A DRYLINE EXTENDING SOUTHWARD
NEAR THE TEXAS AND FAR WESTERN OKLAHOMA STATE LINE.  MEANWHILE...A
STRONG UPPER LEVEL WEATHER SYSTEM CONTINUED TO SWING OUT INTO THE
PLAINS.

STRONG TO SEVERE THUNDERSTORMS HAVE DEVELOPED OVER WESTERN OKLAHOMA
AND NORTHWEST TEXAS NEAR THE RED RIVER.  ADDITIONAL STORMS ARE EXPECTED
TO DEVELOP ALONG AND AHEAD OF THE DRYLINE DURING THE EVENING...WITH THE
STORMS EVENTUALLY FORMING INTO A SQUALL LINE.  A TORNADO WATCH IS IN
EFFECT FOR MUCH OF THE WESTERN HALF OF OKLAHOMA EARLY THIS EVENING AND
ADDITIONAL WATCHES ARE LIKELY LATER ON AS THE SQUALL LINE FORMS AND
MOVES TO THE EAST.

THE SQUALL LINE IS EXPECTED TO MOVE INTO EASTERN OKLAHOMA BETWEEN
9 PM AND MIDNIGHT...REACHING A TULSA TO MCALESTER LINE BY AROUND
MIDNIGHT...THEN MOVE ON INTO NORTHWEST ARKANSAS AFTER MIDNIGHT.

THE MAIN THREAT FROM SEVERE THUNDERSTORMS ALONG THE SQUALL LINE WILL
BE DAMAGING STRAIGHT LINE WINDS AND LARGE HAIL.  THERE IS ALSO SOME
POTENTIAL FOR A FEW WIDELY SCATTERED SUPERCELL THUNDERSTORMS OUT AHEAD
OF THE SQUALL LINE THIS EVENING.  ANY SUPERCELL STORMS WILL BRING AN
INCREASED THREAT OF TORNADOES...MAINLY FOR EASTERN OKLAHOMA.

EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS SHOULD BE
PREPARED FOR ACTIVATION TONIGHT.