Severe Thunderstorm Warning 124, NWS Lubbock, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LUBBOCK TX
316 PM CDT WED SEP 24 2014

.SHORT TERM...
AT 230 PM...A LINE OF STRONG TO SEVERE T-STORMS CONTINUES TO
PROGRESS SOUTH AND SOUTHWEST TOWARD THE CWA. THESE STORMS ARE
EXPECTED TO REMAIN ROUGHLY ON THE SAME TRACK THROUGH OUR
CWA...FOLLOWING THE INSTABILITY AXIS. DEEP-LAYER SHEAR DOES
GRADUALLY DECREASE FARTHER SOUTH FROM THE PANHANDLE...SO THE STORMS
MAY EXHIBIT A GRADUAL WEAKENING TREND...AT LEAST FOR HAIL
POTENTIAL...BUT WE COULD SEE SOME COLD POOL/OUTFLOW ORGANIZATION
WHICH COULD MAINTAIN/INCREASE THE WIND THREAT. BY 7 OR 8 PM...THE
BULK OF THE ACTIVITY SHOULD BE EXITING OUR SRN-SW COUNTIES AND WE
WOULD EXPECT A QUIET PERIOD MUCH OF THE OVERNIGHT PERIOD AS THE
ATMOSPHERE IS STABILIZED. BUT WITH THE MID-LEVEL LOW/TROUGH EXPECTED
TO REMAIN NEARLY STATIONARY OVER THE AREA...WE ARE LIKELY TO SEE
SOME REDEVELOPMENT EARLY THU MORNING. GUIDANCE HINTS AT THIS
OCCURRENCE WITHIN A BROAD BAND RUNNING FROM THE WRN SPLNS INTO THE
SOUTH-CENTRAL TX PANHANDLE. THE UPPER TROUGH IS FORECAST TO DRIFT WEST
DURING THE DAY...WHICH SHOULD DRAG THE BEST T-STORM CHANCES WITH
IT...AND WE EXPECT ACTIVITY TO BE FOCUSED NEAR THE TX/NM STATE LINE
BY LATE AFTERNOON. INSTABILITY APPEARS TO BE WEAKER IN GENERAL
THURSDAY...BUT ML-CAPES NEAR 1000 J/KG ACROSS THE WRN SPLNS MAY
SUPPORT SOME STRONGER PULSE-TYPE CELLS. TEMPERATURES ARE EXPECTED TO
REMAIN FAIRLY SIMILAR TO THE PAST COUPLE OF DAYS...HIGHS MAINLY IN
THE UPPER 70S AND LOWER 80S. WE COULD SEE A BIT MORE WARMING IN THE
LOW ROLLING PLAINS AS DRIER AIR AND LESS CLOUD COVER IS EXPECTED IN
THAT AREA.

&&

.LONG TERM...
A CHANGE TO A MORE PROGRESSIVE AND DYNAMIC PATTERN REMAINS IN THE
OFFING BY LATE THIS WEEKEND THROUGH NEXT WEEK AS OUR RECENT
STRETCH OF STAGNANT FLOW IS REPLACED BY STRONGER WESTERLIES. UNTIL
THEN...MOST OF THE SOUTH PLAINS WILL REMAIN IN THE VICINITY OF A
DECAYING AND LARGELY STATIONARY UPPER LOW JUST TO OUR SOUTH BEFORE
WEAK RIDGING SHUNTS THIS FEATURE TO OUR EAST BY THE WEEKEND. SAID
LOW AND INVERTED TROUGH STILL LOOK TO RETROGRADE TO OUR WEST BY
FRI WHILE ADVECTING DRIER EASTERLY WINDS ALOFT...SO LOWER PWATS
AND INCREASING SUBSIDENCE SHOULD KEEP PRECIP AT BAY AFTER THU.

BY SAT...A DEEP CYCLONE DIGGING INTO THE GREAT BASIN WILL HELP
SPUR RISING HEIGHTS DOWNSTREAM INTO ERN NM. THIS PROCESS WILL
SLOSH THE REMNANTS OF THE DECAYING UPPER LOW BACK TO THE EAST AND
IN THE PROCESS PUSH A SLIVER OF DEEPER MOISTURE ATOP THE CWA. NOT
YET SOLD ON THE LIGHT QPF FROM THE GFS AND ECM BY SAT EVENING AS
MODEL SOUNDINGS RETAIN ENOUGH OF A SUBSIDENCE INVERSION ALOFT
WHICH SHOULD CAP PARCELS SHY OF THEIR LFC HEIGHTS...ESPECIALLY IN
SUCH A WEAKLY FORCED SETUP.

THE UPPER RIDGE AXIS SHOULD SIT SQUARELY OVER THE AREA ON SUNDAY
BEFORE SHIFTING EAST BY MONDAY AHEAD OF WEAK HEIGHT FALLS AND
INCREASINGLY CYCLONIC SWLY FLOW. DESPITE A SURFACE TROUGH PROGGED
TO SIT OVER THE SOUTH PLAINS AND PANHANDLE ON MONDAY...THE DRYLINE
IS SHOWN TO LAG WELL BEHIND THIS FEATURE. NONETHELESS...ADEQUATE
MOISTURE AND BREAKABLE CAPPING MAY WARRANT SOME POPS IN LATER
FORECASTS IF THIS PATTERN CONTINUES. THEREAFTER...THE DRYLINE
SHOULD PUSH THRU LATE MON/EARLY TUE AHEAD OF DEEP WESTERLY FLOW
BEFORE STALLING SOMEWHERE ACROSS THE WRN RED RIVER OR EVEN
FARTHER WEST IF THE ECMWF IS CORRECT. THIS COULD PROLONG POPS FOR
AT LEAST THE ROLLING PLAINS THRU MID/LATE WEEK UNDER A BROAD
CYCLONIC FLOW REGIME.

&&

.PRELIMINARY POINT TEMPS/POPS...
FRIONA        58  77  55  76  56 /  30  20  10  10  10
TULIA         59  79  55  78  57 /  30  20  10  10  10
PLAINVIEW     60  78  56  77  57 /  30  20  10  10  10
LEVELLAND     59  78  57  76  57 /  30  20  10  10  10
LUBBOCK       61  78  57  76  57 /  20  20  10  10  10
DENVER CITY   59  77  57  76  58 /  20  20  10  10  10
BROWNFIELD    60  78  58  77  58 /  20  20  10  10  10
CHILDRESS     64  85  60  82  60 /  30  20   0  10  10
SPUR          62  81  58  80  60 /  20  10   0  10  10
ASPERMONT     62  83  61  83  62 /  20  10   0  10  10

&&

.LUB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

33/93

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LUBBOCK TX
108 PM CDT WED SEP 24 2014

TXZ021>044-251815-
PARMER-CASTRO-SWISHER-BRISCOE-HALL-CHILDRESS-BAILEY-LAMB-HALE-
FLOYD-MOTLEY-COTTLE-COCHRAN-HOCKLEY-LUBBOCK-CROSBY-DICKENS-KING-
YOAKUM-TERRY-LYNN-GARZA-KENT-STONEWALL-
108 PM CDT WED SEP 24 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE EXTREME SOUTHERN TEXAS
PANHANDLE...SOUTH PLAINS AND ROLLING PLAINS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

CONVECTIVE

A FEW STRONG OR BRIEFLY SEVERE THUNDERSTORMS ARE EXPECTED THIS
AFTERNOON AND EARLY TONIGHT. THESE STORMS COULD HAVE HAIL UP TO
ONE INCH IN DIAMETER WITH LOCAL WIND GUSTS IN EXCESS OF 55 MPH.
THE THREAT IS HIGHEST ACROSS THE FAR SOUTHERN TEXAS PANHANDLE AND
NORTHWESTERN SOUTH PLAINS...MAINLY TO THE NORTH AND WEST OF A LINE
FROM MORTON TO SILVERTON.

FLOODING
SLOW-MOVING THUNDERSTORMS WITH HEAVY RAIN MAY RESULT IN MINOR
FLOODING OF STREAMS...DRAWS...AND OTHER LOW-LYING AREAS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
THE THREAT OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...
LIMITED SPOTTER ACTIVATION MAY BE REQUESTED THIS AFTERNOON AND EVENING.

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