Area Forecast Discussion
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FXUS64 KLUB 250025 AAA
AFDLUB

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE LUBBOCK TX
725 PM CDT SUN AUG 24 2014

.UPDATE...
QUICK UPDATE TO ADJUST POP/WX/QPF GRIDS THROUGH THIS EVENING TO
BETTER CORRESPOND TO CURRENT RADAR TRENDS. MOST NOTABLY...
INCREASED POPS INTO THE CHANCE AND LIKELY CATEGORIES ACROSS A GOOD
PORTION OF THE ROLLING PLAINS WHERE A POORLY ORGANIZED CLUSTER OF
CONVECTION CONTINUES. WE EXPECT AN OVERALL DOWNWARD TREND IN THE
CONVECTION THROUGH THE MID/LATE EVENING HOURS AS THE UNSTABLY AND
DIURNALLY DRIVEN FORCING WANES.

&&

.PREV DISCUSSION... /ISSUED 636 PM CDT SUN AUG 24 2014/

AVIATION...
CURRENT RADAR TRENDS SUGGEST THAT KLBB AND KCDS MAY ESCAPE ANY
-TSRA IN THE NEXT HOUR OR SO...BUT THERE IS STILL AN OUTSIDE
CHANCE. ALSO...SOME GUSTY OUTFLOW WINDS ARE STILL POSSIBLE.
OTHERWISE...VFR CONDITIONS WITH SRLY SURFACE WINDS EXPECTED
THROUGH MID-AFTERNOON MONDAY.

PREV DISCUSSION... /ISSUED 343 PM CDT SUN AUG 24 2014/

SHORT TERM...
DESPITE OF A WESTWARD EXPANSION OF WEAK RIDGING ALOFT AND VERY
LITTLE IF ANY SURFACE FEATURES...AN ADEQUATE BOOST IN THETA-E EARLIER
TODAY SUPPLIED MUCH OF THE AREA WITH DEEPER MOISTURE NECESSARY FOR
SOME DIURNALLY DRIVEN TSTORMS. NON-HIGH RES MODELS HAVE LARGELY
MISSED THE BOAT SO FAR TODAY WITH THE EXPERIMENTAL MODELS PLAYING
THE ROLE OF THE DARK HORSE. RAP DATA SHOW THE RICHEST PWATS OF 1.3
INCHES CONFINED EAST OF A BROWNFIELD TO SILVERTON LINE WITH
GENERALLY ONE INCH OR LESS FARTHER WEST. ENVIRONMENT IN THE RICHER
PWATS IS CHARACTERIZED BY SBCAPES OF 1200-2500 J/KG WITH WEAK SHEAR.
THIS THEME WILL PERSIST THROUGH MID-EVENING AT WHICH POINT TSTORMS
WILL DWINDLE...BUT UNTIL THEN WE EXPECT ADDITIONAL STRONG TO PERHAPS
BRIEFLY SEVERE PULSE MODES WITH MICROBURSTS THE PRIMARY HAZARD.

BY MONDAY MORNING...DEEPER MONSOONAL MOISTURE WILL BE TUGGED NORTH
INTO NEW MEXICO AROUND THE ZONAL RIDGE AXIS STILL POISED FIRMLY OVER
THE SOUTH PLAINS. HEIGHT FIELDS ON THE WESTERN PERIPHERY OF THIS
RIDGE ARE NOT SHOWN TO BUILD ANY...SO THE OPPORTUNITY WILL EXIST FOR
ANOTHER ROUND OF SOLAR-POWERED TSTORMS MAINLY NEAR THE NM STATE LINE
WHERE OCCASIONAL DISTURBANCES ARE PROGGED TO LIFT NORTH FROM
CHIHUAHUA. OTHERWISE...WE CONTINUE TO SIDE WITH THE WARMER SPECTRUM
OF MOS GUIDANCE FOR BOTH LOWS AND HIGHS GIVEN THE RECENT OBSERVED
TRENDS.

LONG TERM...
COOLER WEATHER IS ON THE WAY AS WELL AS A SHOT FOR RAIN. BUT BEFORE
WE GET THERE...WARM AND DRY WEATHER WILL CONTINUE TO DOMINATE US AS
HIGH PRESSURE TO OUR EAST EXTENDS OVER THE REGION. OUR NORTHWESTERN
ZONES WILL HAVE A BIT OF A REPRIEVE MONDAY NIGHT AS A WEAKNESS
PROPAGATES AROUND THE WESTERN EDGE OF THE RIDGE. THE WEAKNESS MAKES
USE OF A SURFACE TROF LOCATED OVER THE SOUTHWESTERN TX PANHANDLE AND
FIRES SCATTERED CONVECTION IN THAT REGION. CHANCES ARE ONLY SLIGHT
AS THE AVAILABLE MONSOONAL MOISTURE ONLY COVERS A VERY SMALL AREA
WHICH COINCIDES WITH THE SURFACE TROF. BY TUESDAY AND INTO
WEDNESDAY...THE RIDGE TO OUR EAST BUILDS FURTHER WEST INHIBITING
CHANCES FOR ANY RAIN...HOWEVER A LOW AWAITS US OVER THE GREAT BASIN
AND IS READY TO MOVE IN AND DEFEAT THE EVIL RIDGE. WITH THE
EXCEPTION OF THE GFS...MODELS HAVE BEEN IN DECENT AGREEMENT WITH
HANDLING OF THE LOW THE PAST SEVERAL RUNS. THE 12Z RUN YIELDED THE
GFS SLOWING THE EASTWARD PROGRESSION OF THE LOW AND IS MORE IN LINE
WITH THE OTHER MODELS. THE LOW WILL INITIALLY START OFF CLOSED AS IT
MOVES ACROSS THE ROCKIES INTO THE CENTRAL PLAINS DURING WHICH TIME
IT WILL SLOWLY BECOME AN OPEN WAVE. BY LATE WEDNESDAY A COLD FRONT
SHOULD BE KNOCKING ON OUR DOOR. THE TIMING OF THE FRONT IS SOMEWHAT
IN QUESTION WITH TIMINGS RANGING FROM EARLY TO LATE THURSDAY...WITH
THURSDAY MORNING BEING THE TIMING CHOICE FOR THE TIME BEING. RAIN
CHANCES WILL EXIST ALONG THE FRONT...ESPECIALLY AS THE UPPER LEVEL
LOW PUSHES INTO THE REGION. PWATS OVER 1.3 INCHES WILL BE MORE THAN
ENOUGH TO AID IN MODERATE RAINFALL AMOUNTS. RAIN CHANCES WILL BE
HIGHEST THURSDAY NIGHT INTO EARLY FRIDAY AS A JET MAX PUSHES IN FROM
THE WEST ON THE SOUTHEAST SIDE OF THE LOW. AS OF NOW THE JET MAX IS
GREATEST OVER OUR SOUTHEASTERN ZONES. THIS COMBINED WITH A DIFFLUENT
UPPER PATTERN SHOULD BE MORE THAN EFFICIENT IN DEVELOPING PRECIP.
THE LOW WILL HAVE AN EXTENDED VISIT AND REMAIN OVERHEAD THROUGH LATE
SUNDAY BEFORE ZONAL FLOW TAKES OVER. TEMPERATURES WILL BE RELATIVELY
COOL IN THE SENSE OF TEMPS WILL BE AROUND SEASONAL AVERAGES BUT
COOLER THAN THEY WILL BE EARLIER THIS WEEK. DEPENDING ON THE
STRENGTH OF THE FRONT...SOME AREAS SUCH AS THE TEXAS PANHANDLE MAY
SEE BELOW AVERAGE TEMPS AS COOL AIR OVER MT INTO CA WILL BE PUSHED
SOUTHWARD. AS OF THIS AFTERNOON...PARTS OF INTERIOR MT HAVE FAILED
TO REACH INTO THE 50S. AS OF NOW THE COOLEST AIR WITH THE FRONT
LATER THIS WEEK SHOULD STAY TO OUR NORTH WITH THE COOL SIDE OF THE
FORECAST BEING IN THE UPPER 50S.

&&

.PRELIMINARY POINT TEMPS/POPS...
FRIONA        65  92  63  90  62 /  10  20  20  10  10
TULIA         69  95  65  93  64 /  20  10  20  10  10
PLAINVIEW     65  95  64  92  64 /  20  10  10  10  10
LEVELLAND     67  94  65  91  64 /  10  10  20  10  10
LUBBOCK       72  96  68  94  68 /  10  10  10  10  10
DENVER CITY   67  95  65  92  65 /  10  10  10  10  10
BROWNFIELD    66  96  66  93  66 /  10  10  10  10  10
CHILDRESS     73 101  72  98  72 /  20  10  10  10  10
SPUR          70 100  68  96  68 /  30   0  10   0  10
ASPERMONT     75 102  72  99  71 /  20   0  10   0  10

&&

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

$$

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