Snow Advisory 7, NWS Lubbock, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LUBBOCK TX
844 PM CST FRI NOV 23 2007

.UPDATE...
THE PRIMARY CONCERN ATTM IS ACCUMULATING SNOWFALL POTENTIAL OVER
THE NORTHWESTERN ZONES BEFORE 12Z. UPDATES TO INCLUDE A SNOW
ADVISORY FOR THE EXTREME SOUTHWESTERN PANHANDLE AND THE
NORTHWESTERN SOUTH PLAINS ARE BEING ISSUED.

CURRENT SATELLITE/RADAR SHOW EXPANDING SNOW SHEILD WITHIN AREA OF
INCREASINGLY DEEP FORCING/ASCENT ASSOCIATED WITH AN EJECTING
SHORTWAVE TROUGH OVER NORTHWESTERN NEW MEXICO AND THE ENTRANCE
REGION OF 100KT JET. HEIGHT/PRESSURE FALLS IN ADVANCE OF SAID
FEATURES ARE RESULTING IN WEAK WARM AIR ADVECTION PROCESSES...AND
LIGHT RETURN FLOW IS RESULTING IN PATCHY FREEZING FOG ON THE
CAPROCK. FORECAST SOUNDINGS/TIME HEIGHT SECTIONS OVER THE
NORTHWESTERN FA SHOW INCREASINGLY FAVORABLE PROFILES FOR
ACCUMULATING SNOWFALL. BY THE 09-12Z TIMEFRAME...STRONG FORCING IS
PROGGED WITHIN THE FAVORED DENTRITIC GROWTH THERMAL LAYERS. IN
ADDITION...SOLUTIONS SUGGEST THAT THE JET CIRCULATION WILL INDUCE
MODEST FRONTOGENETICAL FORCING CENTERED AROUND THE 700MB LAYER...
AND WITH THIS TRANSLATING SOUTHWARD WITH TIME...THE THREAT OF
HEAVY SNOW WILL INCREASE AND SHIFT SOUTHWARD INTO THE CURRENT
WINTER STORM WATCH AREA. WOULD NOT BE SURPRISED TO SEE ISOLATED
SNOW ACCUMULATIONS TOTAL 4 INCHES /WARNING CRITERIA/ IN VICINITY
THE TEXAS/NEW MEXICO BORDER BY EARLY TOMORROW AFTERNOON...BEFORE
THE FIRST ROUND FROM THIS WEEKEND/S WINTER STORM SUBSIDES. THUS
ADVISORY COULD NEED TO BE EXTENDED/UPGRADED DURING THE OVERNIGHT
HOURS...ALONG WITH POTENTIAL CHANGES TO THE ONGOING WATCH.

THE FORECAST LOOKS ON TRACK LATE SATURDAY THROUGH SUNDAY...WITH
PERHAPS A MORE SIGNIFICANT ROUND OF ACCUMULATING SNOWFALL EXPECTED
TO FAVOR THE SOUTHERN HALF OF THE AREA SUNDAY.

&&

.AVIATION...
WE ARE EXPECTING CEILINGS AND VISIBILITIES TO SLOWLY LOWER AT KLBB
THROUGH THE NIGHTTIME HOURS. WARM AIR ADVECTION OVER THE COLD
SURFACE AIR WILL RESULT IN LOW STRATUS...FOG/FREEZING FOG...AND
PERHAPS SOME PERIODS OF FREEZING DRIZZLE/SNOW FLURRIES. NO
SIGNIFICANT ACCUMULATION IS EXPECTED. BOTH CEILINGS AND VSBYS MAY
LOWER TO IFR AT TIMES...ALTHOUGH MVFR CONDITIONS SHOULD DOMINANT.
THE CHANCE FOR LIGHT SNOW IN THE LUBBOCK AREA WILL INCREASE AFTER
ABOUT 9 ZULU/3 AM CST. AT CHILDRESS...CONDITIONS WILL BE SLOWER TO
DETERIORATE THAN AT LUBBOCK. CEILINGS ARE EXPECTED TO LOWER TO
AROUND 3K FT RESULTING IN MVFR CONDITIONS BUT BRIEF PERIODS OF LIGHT
DRIZZLE OR FREEZING DRIZZLE ARE NOT EXPECTED TO ACCUMULATE OR HAVE
MUCH IMPACT ON VSBYS.

&&

.PRELIMINARY POINT TEMPS/POPS...
FRIONA        24  31  23  43  26 /  80  80  20  20   0
TULIA         27  33  25  40  25 /  70  60  20  20   0
PLAINVIEW     28  33  26  38  28 /  70  60  30  40   0
LEVELLAND     27  33  26  40  27 /  80  80  50  60   0
LUBBOCK       29  33  27  37  29 /  70  70  50  60  10
DENVER CITY   27  30  28  43  30 /  70  80  60  60  10
BROWNFIELD    27  32  27  40  31 /  70  80  60  60  10
CHILDRESS     27  36  31  39  31 /  40  30  20  50  20
SPUR          31  33  30  36  31 /  70  60  60  60  10
ASPERMONT     31  36  31  37  30 /  60  60  60  60  20

&&

.LUB WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WATCH FROM 6 AM CST SATURDAY THROUGH SUNDAY MORNING
FOR THE FOLLOWING ZONES: TXZ033>044.

SNOW ADVISORY UNTIL 6 AM CST SATURDAY FOR THE FOLLOWING ZONES:
TXZ021>023-027>029.

&&

20/33/33

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