Tornado Warning 18, NWS San Angelo, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
159 AM CDT FRI APR 25 1997

IMPRESSIVE 120 KNOT JET AT 300 MB EXTENDED FROM LAS VEGAS NORTHWARD
TO THE CANADIAN BORDER. THIS WILL ALLOW THE UPPER LEVEL LOW IN
EASTERN ARIZONA TO CONTINUE DIGGING SOUTH-SOUTHEASTWARD THROUGH THE
NEXT 24-36 HOURS...MORE IN LINE WITH THE ETA AND AVN MODELS. UPPER
LEVEL DIVERGENCE WILL REMAIN OVER OUR REGION THROUGH SATURDAY MORNING
WHICH SHOWS UP WELL ON SATELLITE WITH THE SPREADING OUT OF THE
CIRRUS SHIELD.

IN GENERAL...A GOOD DEAL OF RAIN IS EXPECTED ACROSS OUR REGION
TODAY AND EVEN MORE LIKELY TONIGHT AS ANOTHER VORTICITY LOBE ROTATES
ACROSS WEST CENTRAL TEXAS OVERNIGHT. FLOOD WATCHES COULD BE POSTED
WITH THE MORNING PACKAGE...ALTHOUGH THE FOCUS OF WHERE THE HEAVIEST
RAIN WILL FALL IS STILL IN QUESTION AT THIS TIME. THE BEST THREAT
FOR SEVERE WEATHER WILL BE OVER THE NORTHERN EDWARDS PLATEAU AND
NORTHWEST HILL COUNTRY WHERE INSTABILITY WILL BE GREATEST.

TEMPERATURES TODAY WILL VARY WIDELY AS THE SOUTHERN THIRD OF OUR
REGION REMAINS IN THE WARM SECTOR AND WILL ALLOW HIGHS TO GET ABOVE
70 DEGREES. NORTH OF THE FRONT IT WILL BE MUCH COOLER DUE TO CLOUD
COVER AND RAIN...AND EVEN THOUGH AVN GUIDANCE LOOKS TOO COOL...THE
TEMPERATURES FOR ABI AND SJT WILL BE CLOSER TO THE COOLER GUIDANCE
FOR BOTH TODAY AND TONIGHT.

IN THE SHORT TERM...STRONG TO OCCASIONALLY SEVERE THUNDERSTORM CELLS
WERE ENTERING THE NORTHWEST CORNER OF CROCKETT COUNTY AND THE
EASTERN PERMIAN BASIN. HEAVY RAINS HAVE FOCUSED ALONG INVERTED TROUGH
OVER WEST TEXAS AND NORTH OF THE WARM FRONT WHICH EXTENDED ROUGHLY
FROM MAF TO ABI TO ACT. A ROUND OF RAIN AND THUNDERSTORMS WILL MOVE
THROUGH THE WATCH BOX AR@EA DURING THE EARLY MORNING HOURS.

ABI 059/046 ++
JCT 075/052 ++
SJT 063/048 ++

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