Severe Thunderstorm Warning 306, NWS Fort Worth, TX

TXZ019>033-301200-

SEVERE WEATHER OUTLOOK FOR NORTH TEXAS
NATIONAL WEATHER SERVICE FORT WORTH TX
400 PM CDT TUE MAY 29 1990

THERE IS A HIGH RISK OF SEVERE THUNDERSTORMS OVER THE EXTREME WESTERN
SECTIONS OF NORTH TEXAS FOR THIS EVENING AND TONIGHT.  THIS HIGH RISK
AREA IS GENERALLY WEST OF A LINE FROM WICHITA FALLS TO ABILENE.

THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THE REMAINDER
OF THE WESTERN HALF OF NORTH TEXAS GENERALLY WEST OF A LINE FROM BONHAM
TO TEMPLE.

AT MID-AFTERNOON... A VERY STRONG UPPER LEVEL LOW PRESSURE TROUGH WAS
LOCATED ACROSS EASTERN NEW MEXICO.  AT THE SURFACE... THE DRYLINE...
A BOUNDARY SEPARATING DRY AIR TO THE WEST FROM MOIST AIR TO THE EAST...
WAS LOCATED ACROSS EASTERN NEW MEXICO FROM NEAR CLAYTON INTO FAR WEST
TEXAS NEAR WINK TO EAST OF MARFA.

STRONG SOUTHEAST SURFACE WINDS WERE PUMPING VERY MOIST AIR INTO WEST
AND NORTH TEXAS THIS AFTERNOON.  DEWPOINTS WERE IN THE MIDDLE 60S OVER
WESTERN SECTIONS OF NORTH TEXAS THIS AFTERNOON AND SHOULD CONTINUE TO
RISE.  THIS MOISTURE WILL PROVIDE FUEL FOR THE THUNDERSTORM DEVELOPMENT.
AFTERNOON HEATING ALONG WITH THE INCREASED MOISTURE HAVE LEFT THE
ATMOSPHERE MODERATELY UNSTABLE WITH LIFTED INDICES OF MINUS 4 TO MINUS
8 ACROSS NORTH TEXAS.  FURTHER DESTABILIZATION CAN BE EXPECTED AS A
STRONG PUNCH OF DRY AIR IN THE MIDDLE LEVELS AND A POOL OF COLD AIR
IN THE UPPER LEVELS MOVE ACROSS WEST TEXAS THIS AFTERNOON AND INTO
NORTH TEXAS THIS EVENING AND TONIGHT.

THUNDERSTORMS DEVELOPED LATE THIS MORNING ACROSS WESTERN SECTIONS OF
WEST TEXAS ALONG THE DRYLINE AND CONTINUED THIS AFTERNOON.  THE DRYLINE
AND THUNDERSTORMS ARE EXPECTED TO MOVE INTO WESTERN SECTIONS OF NORTH
TEXAS LATE THIS AFTERNOON AND EVENING AND INTO NORTH CENTRAL TEXAS
TONIGHT.

THE STRONGER THUNDERSTORMS ARE EXPECTED TO PRODUCE VERY HEAVY RAIN...
LARGE HAIL AND DAMAGING STRAIGHT-LINE WINDS.  THE VERTICAL WIND PROFILE
ALSO FAVORS THE POSSIBILITY OF ISOLATED TORNADOES.

ONE OTHER COMPLICATING FACTOR IS A RIDGE OF HIGH PRESSURE OVER EAST
TEXAS AND LOUISIANA WHICH COULD SLOW THE EASTWARD MOVEMENT OF THE
DRYLINE AND THE THUNDERSTORMS.  SLOWER-MOVING THUNDERSTORMS COULD
PRODUCE VERY HEAVY RAIN WITH ONE TO TWO INCHES EXPECTED AND ISOLATED
AMOUNTS TO FOUR INCHES POSSIBLE.

STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL WILL WANT TO MONITOR
THE DEVELOPMENT OF THIS STORM SITUATION.  STORM SPOTTER ACTIVATION WILL
BE LIKELY ACROSS THE EXTREME WESTERN SECTIONS OF NORTH TEXAS BY LATE
AFTERNOON... ACROSS NORTH CENTRAL TEXAS LATE THIS EVENING AND EARLY
TONIGHT... AND POSSIBILY IN NORTHEAST TEXAS LATE TONIGHT AND DURING THE
EARLY MORNING HOURS.