Tornado Warning 6, NWS San Angelo, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
630 PM CDT THU APR 16 2009

.DISCUSSION...
SEE 00Z AVIATION DISCUSSION BELOW.

&&

.AVIATION...
SEVERE STORMS TO THE WEST OF OUR AREA WILL MOVE EAST ACROSS WEST
CENTRAL TEXAS AFTER 17/03Z. THE STORMS WILL PROBABLY DEVELOP INTO
A CONVECTIVE COMPLEX AS THEY MOVE EAST ACROSS WEST CENTRAL TEXAS.
HAVE INCLUDED 4SM TSRA AT ALL TERMINALS BETWEEN 17/08Z AND 17/13Z.
ALSO...WIDESPREAD MVFR CIGS ARE EXPECTED TONIGHT AND FRIDAY
MORNING...WITH SOME LCL IFR CIGS POSSIBLE.

21

&&

.PREV DISCUSSION... /ISSUED 502 PM CDT THU APR 16 2009/

UPDATE...
SEE UPDATE DISCUSSION BELOW.

DISCUSSION...
UPDATED ZONES AND GRIDS FOR TORNADO WATCH #157 UNTIL
MIDNIGHT...WHICH INCLUDES 5 COUNTIES ACROSS THE BIG COUNTRY AND
CONCHO VALLEY. SEVERE STORMS ARE FIRING ALONG THE DRYLINE TO OUR
WEST...AND WILL AFFECT WEST CENTRAL TEXAS LATER THIS EVENING.

21

PREV DISCUSSION... /ISSUED 316 PM CDT THU APR 16 2009/

SHORT TERM...

SEVERE WEATHER EVENT POSSIBLE...MAINLY AFTER MIDNIGHT TONIGHT AND
EARLY FRIDAY MORNING FOR THE SAN ANGELO COUNTY WARNING AREA.

ELEVATED DISORGANIZED THUNDERSTORMS IN CALLAHAN...THROCKMORTON
AND HASKELL COUNTIES WERE MOVING NORTH THIS AFTERNOON. ENOUGH MID
LEVEL INSTABILITY AND MOISTURE IN THIS AREA TO PRODUCE AN ISOLATED
SEVERE THUNDERSTORM THIS AFTERNOON/EVENING. CAP HOWEVER LIKELY TOO
LARGE TO BREAK ELSEWHERE THIS AFTERNOON AND EARLY EVENING...EVEN
WITH THE SUNSHINE IN THE CONCHO VALLEY AND N EDWARDS PLATEAU.
HOWEVER...IF THE CAP DOES BREAK...WESTERN AREAS...FROM CROCKETT
COUNTY UP TO STERLING AND FISHER COUNTY MAY HAVE A SEVERE
THUNDERSTORM.

MAIN SEVERE STORM POTENTIAL HOWEVER WILL BE LATER TONIGHT FOR
WEST CENTRAL TEXAS...MAINLY AFTER MIDNIGHT. STORMS ARE EXPECTED TO
INITIATE ALONG THE DRYLINE IN THE PERMIAN BASIN UP INTO THE
PANHANDLE THIS AFTERNOON...THEN DEVELOP SOUTHWARD AS UPPER LOW
OVER IN THE 4-CORNERS MOVES SOUTHEAST AND DESTABILIZES THE
ATMOSPHERE. SEVERE WEATHER LIKELY AS THE SQUALL LINE THEN MOVES
SLOWLY EAST. GFS MODEL HAS HIGH 1-6 KM BULK SHEAR OF 40-55 AND
VERY HIGH HELICITIES OF 400-800. GFS/NAM MODEL CAPES WERE IN THE
500-1500 J/KG RANGE BUT MAY BE UNDERDONE AS MIDLAND 12Z SOUNDING
THIS MORNING HAD CAPES OF 3200 J/KG. HAIL...DAMAGING WINDS THE
MAIN THREAT...BUT AN ISOLATED TORNADO ALSO POSSIBLE. LOCALLY HEAVY
RAINFALL ALSO POSSIBLE AS STORMS WILL MOVE NE...ALONG SLOW MOVING
SQUALL LINE/DRYLINE. STORMS MAY LINGER ACROSS THE EASTERN HALF OF
THE COUNTY WARNING AREA FRIDAY MORNING...BRINGING MAINLY A HEAVY
RAINFALL THREAT...BUT ALSO FOR THE POTENTIAL FOR A SEVERE
THUNDERSTORM. LOCALLY HEAVY RAINFALLS OF 1-2 INCHES POSSIBLE. A
FEW AREAS MAY SEE MORE.

LONG TERM...
KEPT A CHANCE OF THUNDERSTORMS IN THE HEARTLAND AND NW HILL
COUNTRY FRIDAY NIGHT AND SATURDAY AS LOW/MID LEVEL MOISTURE AND
INSTABILITY WONT CLEAR COMPLETELY AWAY. COLD FRONT SATURDAY NIGHT
FINALLY PUSHES MOISTURE.

DRY INTO THE MIDDLE OF NEXT WEEK. MAY POSSIBLY SEE A SLIGHT
CHANCE OF SHOWERS THURSDAY INTO FRIDAY...AS GFS MODELS SHOW
MOISTURE RETURNING FROM THE GULF...AND A UPPER LOW DEVELOPS OVER
THE CENTRAL ROCKY MOUNTAINS. WILL KEEP FORECAST DRY AS UPPER LOW
STILL FAIRLY FAR AWAY AT THAT TIME.

&&

.PRELIMINARY POINT TEMPS/POPS...
ABILENE 	 55  73  48  78  47 /  90  40  10  10   0
SAN ANGELO 	 55  79  45  82  47 /  80  30  10  10   0
JUNCTION 	 61  78  52  81  47 /  70  50  20  30  10

&&

.SJT WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
239 PM CDT THU APR 16 2009

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-171945-
FISHER-NOLAN-STERLING-COKE-RUNNELS-IRION-TOM GREEN-CONCHO-
CROCKETT-SCHLEICHER-SUTTON-HASKELL-THROCKMORTON-JONES-SHACKELFORD-
TAYLOR-CALLAHAN-COLEMAN-BROWN-MCCULLOCH-SAN SABA-MENARD-KIMBLE-
MASON-
239 PM CDT THU APR 16 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS...SOME POSSIBLY SEVERE...ARE LIKELY. EXPECT THESE
THUNDERSTORMS TO MOVE MAINLY NORTH. SOME THUNDERSTORMS MAY PRODUCE
VERY HEAVY RAINFALL. THUS...THE MAIN THREATS WILL BE DANGEROUS
LIGHTNING...DAMAGING WINDS...LARGE HAIL...POSSIBLE FLASH
FLOODING...AND ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE POTENTIAL FOR SEVERE THUNDERSTORMS WILL CONTINUE TOMORROW
MORNING...MAINLY EAST OF A LINE FROM HASKELL...TO SAN ANGELO...TO
SONORA. AGAIN...THE MAIN THREATS WILL BE DANGEROUS
LIGHTNING...DAMAGING WINDS...LARGE HAIL...POSSIBLE FLASH
FLOODING...AND ISOLATED TORNADOES.

.SPOTTER INFORMATION STATEMENT...

WE MAY NEED SPOTTERS TONIGHT AND TOMORROW.

23/HUBER

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
928 PM CDT THU APR 16 2009

TXZ049-054-064>066-071-072-076>078-113-127-169-170430-
NOLAN TX-JONES TX-FISHER TX-TAYLOR TX-STERLING TX-COKE TX-RUNNELS TX-
TOM GREEN TX-IRION TX-SCHLEICHER TX-CROCKETT TX-SUTTON TX-KIMBLE TX-
928 PM CDT THU APR 16 2009

...SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 1130 PM CDT FOR NOLAN...
JONES...FISHER...TAYLOR...STERLING...COKE...RUNNELS...TOM GREEN...
IRION...SCHLEICHER...CROCKETT...SUTTON AND KIMBLE COUNTIES...

AT 914 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS INDICATED BY
NATIONAL WEATHER SERVICE DOPPLER RADAR ALONG A LINE EXTENDING FROM
17 MILES SOUTH OF LAMESA TO 12 MILES NORTH OF ODESSA TO 14 MILES
WEST OF CRANE...MOVING EAST AT 40 MPH. ALSO...A SEVERE THUNDERSTORM
WHICH HAD A TORNADO REPORTED WAS LOCATED NEAR FAIRFIELD IN HOWARD
COUNTY...MOVING EAST AT 25 MPH.

THIS LINE OF SEVERE STORMS WILL MOVE EAST INTO WEST CENTRAL
TEXAS...TO NEAR A SWEETWATER TO SAN ANGELO TO OZONA LINE BY
MIDNIGHT. THE STORMS WILL PRODUCE LARGE HAIL...DAMAGING WINDS AND
ISOLATED TORNADOES. RESIDENTS ARE ENCOURAGED TO MONITOR THE
SITUATION CLOSELY AND BE PREPARED TO TAKE THE PROPER ACTIONS SHOULD
WARNINGS BE ISSUED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT FRIDAY MORNING
FOR WEST CENTRAL TEXAS.