Severe Thunderstorm Warning 40, NWS San Angelo, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
1008 AM CST FRI APR 4 1997

GOES-8/9 WATER VAPOR IMAGERY INDICATES AN ELONGATED UPPER LOW AXIS
EXTENDING FROM NORTHWEST MEXICO TO SOUTHWEST NEW MEXICO PROGRESSING
STEADILY EAST. SURFACE ANALYSIS AND NEXRAD INDICATED DRYLINE ENTERING
THE WESTERN TIER OF OUR COUNTIES. LIFTED INDICES IN THIS AREA
ESTIMATED -2 BY ADAP...WITH -4 LI/S OVER THE HEARTLAND AND HILL
COUNTRY. EXPECT INCREASED DAYTIME INSTABILITY FROM DAYTIME HEATING
AND COLD UPPER ADVECTION THROUGH LATE AFTERNOON. MOISTURE CONVERGENCE
EXPECTED TO INCREASE AS THE DRYLINE PROGRESSES EAST INTO HIGHER LOW
LEVEL GULF MOISTURE.  GOOD SEVERE POTENTIAL EXISTS THROUGH LATE
AFTERNOON OVER THE EASTERN 2/3 OF OUR COUNTY WARNING AREA.

WATER VAPOR IMAGERY INDICATES A JET STREAK ROUNDING THE BASE OF
THE UPPER TROF IN CENTRAL MEXICO. THIS FEATURE WILL ROUND THE TROF
AND PASS THROUGH CENTRAL TEXAS THIS AFTERNOON.

CURRENT FORECASTS HIGHS LOOK ON TRACK. WILL MAKE SLIGHT ADJUSTMENTS
TO POPS BY 17Z...IF NEEDED...BASED ON RADAR TRENDS.

14

TXZ049-053-054-064>066-071>073-076>078-113-114-127-128-139-140-
154-155-168>170-042030-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
545 AM CST FRI APR 4 1997

...THERE IS A CHANCE OF SEVERE THUNDERSTORMS OVER WEST CENTRAL
TODAY...

SCATTERED THUNDERSTORMS...SOME POSSIBLY SEVERE...ARE EXPECTED
TO DEVELOP ALONG A PACIFIC COLD FRONT THAT WILL MOVE EASTWARD
ACROSS WEST CENTRAL TEXAS THIS MORNING.

IN THE UPPER ATMOSPHERE...COOLER AIR WILL MOVE OVER OUR AREA.
THE COMBINATION OF COLD AIR ALOFT AND DAYTIME HEATING AT THE
SURFACE WILL LIKELY CAUSE THUNDERSTORMS TO DEVELOP OVER WEST
CENTRAL TEXAS BY MID DAY.  THESE THUNDERSTORMS COULD EVOLVE INTO
A LINE WHICH MAY PRODUCE STRONG WINDS AND HAIL OVER PARTS OF OUR
AREA.
>
THE THREAT OF SEVERE WEATHER SHOULD END WEST OF A SONORA TO
SAN ANGELO TO SWEETWATER LINE BY NOON TODAY...AS DRIER AIR
AT THE SURFACE PUSHES IN BEHIND THE COLD FRONT.  SCATTERED
THUNDERSTORMS SHOULD MOVE OUT OF ALL WEST CENTRAL TEXAS
BY LATE AFTERNOON AS THE DRY WEST TO SOUTHWEST WINDS SPREAD
ACROSS THE ENTIRE AREA.

SPOTTER ACTIVATION MAY BE REQUIRED DURING THE DAY TODAY.
EMERGENCY MANAGERS AND OTHER OFFICIALS SHOULD BEGIN MONITORING
THE LATEST WEATHER DEVELOPMENTS IMMEDIATELY.

09

TXZ049-053-054-064>066-071>073-076>078-113-114-127-128-139-140-
154-155-168>170-042030-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
545 AM CST FRI APR 4 1997

...THERE IS A CHANCE OF SEVERE THUNDERSTORMS OVER WEST CENTRAL
TODAY...

SCATTERED THUNDERSTORMS...SOME POSSIBLY SEVERE...ARE EXPECTED
TO DEVELOP ALONG A PACIFIC COLD FRONT THAT WILL MOVE EASTWARD
ACROSS WEST CENTRAL TEXAS THIS MORNING.

IN THE UPPER ATMOSPHERE...COOLER AIR WILL MOVE OVER OUR AREA.
THE COMBINATION OF COLD AIR ALOFT AND DAYTIME HEATING AT THE
SURFACE WILL LIKELY CAUSE THUNDERSTORMS TO DEVELOP OVER WEST
CENTRAL TEXAS BY MID DAY.  THESE THUNDERSTORMS COULD EVOLVE INTO
A LINE WHICH MAY PRODUCE STRONG WINDS AND HAIL OVER PARTS OF OUR
AREA.
>
THE THREAT OF SEVERE WEATHER SHOULD END WEST OF A SONORA TO
SAN ANGELO TO SWEETWATER LINE BY NOON TODAY...AS DRIER AIR
AT THE SURFACE PUSHES IN BEHIND THE COLD FRONT.  SCATTERED
THUNDERSTORMS SHOULD MOVE OUT OF ALL WEST CENTRAL TEXAS
BY LATE AFTERNOON AS THE DRY WEST TO SOUTHWEST WINDS SPREAD
ACROSS THE ENTIRE AREA.

SPOTTER ACTIVATION MAY BE REQUIRED DURING THE DAY TODAY.
EMERGENCY MANAGERS AND OTHER OFFICIALS SHOULD BEGIN MONITORING
THE LATEST WEA
THER DEVELOPMENTS IMMEDIATELY.

09