FXUS64 KSHV 050317
AFDSHV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
917 PM CST FRI DEC 4 2009
.DISCUSSION...
AREAS OF SNOW HAS QUICKLY EXITED THE REGION THIS EVENING...AS PARENT
LONGWAVE TROUGH CONTINUES TO QUICKLY TRAVERSE E ACROSS THE LOWER MS
VALLEY. SKIES HAVE QUICKLY CLEARED IN WAKE OF THE TROUGH AXIS AS
WELL...WITH THE ERN SECTIONS OF NCNTRL LA EXPECTED TO CLEAR BY
MIDNIGHT. MEANWHILE...ARCTIC AIR REMAINS FIRMLY ENTRENCHED ACROSS MUCH
OF THE NATION/S MIDSECTION...ALONG THE SFC RIDGE AXIS THAT HAS SETTLED
FROM THE TX BIG BEND REGION...NE INTO THE MID MS VALLEY. GIVEN THE
RELATIVELY CALM WINDS BENEATH THE RIDGE ACROSS OUR REGION
OVERNIGHT...NEARLY IDEAL RADIATIONAL COOLING WILL RESULT IN THE
COLDEST TEMPERATURES OF THE SEASON. ALL BUT THE EXTREME ERN SECTIONS
OF THE FORECAST AREA ARE CURRENTLY AT/BELOW FREEZING AS OF 03Z...AND
THESE PROLONGED FREEZING TEMPS WILL PERSIST ANOTHER 12 HRS OR SO
THROUGH SATURDAY MORNING. THUS...THE FREEZE WARNING FOR ALL OF N LA/E
TX ALONG/S OF I-20 WILL PERSIST THROUGH 15Z...SINCE MUCH OF THESE
AREAS HAVE YET TO FREEZE THIS SEASON. DID LOWER TEMPS A TAD BASED ON THE
LATEST OB TRENDS...BUT DON/T EXPECT TEMPS TO FALL TO THE EXCESSIVELY
LOW VALUES THAT THE EARLIER MAVMOS WERE ADVERTISING. THE NRN ZONES /SE
OK/ADJACENT SW AR/ WILL BE FLIRTING WITH HARD FREEZE WARNING
CRITERIA...BUT ONLY THE WELL PROTECTED AREAS OF NRN MCCURTAIN CO
SHOULD SEE TEMPS FALL INTO THE MID TEENS LATE TONIGHT. BUT
REGARDLESS...PATCHY ICE MAY BE A PROBLEM OVERNIGHT OVER PORTIONS OF
DEEP E TX/SRN SECTIONS OF NCNTRL LA...WHERE A DUSTING OF SNOW/BRIEF
1/2" ACCUMULATIONS OCCURRED...AND STANDING WATER STILL REMAINS ON SOME
ROADS...BRIDGES AND OVERPASSES. AN SPS HAS BEEN ISSUED TO ADDRESS THE
POTENTIALLY TRICKY TRAVEL OVERNIGHT.
TEMPS WILL GRADUALLY WARM AFTER SUNRISE SATURDAY...WITH ABUNDANT
SUNSHINE FOR MUCH OF THE DAY UNTIL CIRRUS BEGINS TO APPROACH THE
REGION FROM THE W DURING THE MID/LATE AFTERNOON.
CANCELLED WINTER WEATHER ADVISORY...IN ADDITION TO THE ENTIRE SUITE OF
PRODUCTS HAVE ALREADY BEEN ISSUED...GRIDS WILL BE AVAILABLE SHORTLY.
15
&&
.AVIATION...
SNOW AND CLOUDS FOR THAT MATTER ARE QUICKLY EXITING THE REGION THIS
EVENING WITH ONLY AC DECK AROUND 12KFT NOTED EAST OF A MLU/IER LINE
AS OF 01Z. NEEDLESS TO SAY...VFR CONDITIONS WILL PREVAIL OVERNIGHT
AND THROUGH THE DAY SATURDAY. LIGHT NW WINDS THIS EVENING WILL
BECOME CALM AT MOST TERMINALS LATER THIS EVENING AS A HIGH PRESSURE
RIDGE AT THE SFC BECOMES ESTABLISHED ACROSS THE REGION. THIS RIDGE
MOVES EAST OF THE REGION DURING THE DAY SATURDAY WITH SOUTH WINDS
RETURNING TO ALL TERMINALS BY 15Z OR SO. SHOULD SEE SOME THIN CIRRUS
RETURNING FROM THE WEST BY SATURDAY AFTERNOON. /13/
&&
.PRELIMINARY POINT TEMPS/POPS...
SHV 24 49 31 51 42 / 0 0 10 30 50
MLU 26 48 31 52 43 / 0 0 10 30 50
DEQ 21 48 26 49 34 / 0 0 10 30 40
TXK 25 49 33 50 39 / 0 0 10 30 40
ELD 23 48 29 52 35 / 0 0 10 30 50
TYR 24 50 34 53 41 / 0 0 10 30 40
GGG 23 49 33 52 39 / 0 0 10 30 50
LFK 24 51 34 55 47 / 0 0 10 30 50
&&
.SHV WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
LA...FREEZE WARNING UNTIL 9 AM CST SATURDAY FOR THE FOLLOWING ZONES:
LAZ001>006-010>014-017>022.
OK...NONE.
TX...FREEZE WARNING UNTIL 9 AM CST SATURDAY FOR THE FOLLOWING ZONES:
TXZ124>126-136>138-149>153-165>167.
&&
$$
15/13
