Area Forecast Discussion
Issued by NWS Brownsville, TX

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000
FXUS64 KBRO 271816 AAA
AFDBRO

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE BROWNSVILLE TX
1216 PM CST THU NOV 27 2014

.DISCUSSION...UPDATED FOR LATEST AVIATION DISCUSSION BELOW.

&&

.AVIATION...THE DRY AIRMASS IN PLACE OVER THE REGION WILL MAINTAIN
VERY GOOD AVIATION CONDITIONS ACROSS THE RGV THROUGHOUT THE NEXT
24 HOURS. THE SURFACE FLOW WILL START TO BECOME MORE EASTERLY
LATER THIS AFTERNOON/EVENING. THIS WILL ALLOW FOR SOME GRADUAL
RETURN OF A LITTLE HIGHER DEWPOINTS THROUGH TOMORROW. THIS IN
COMBINATION WITH LIGHT SURFACE WINDS TONIGHT MAY ALLOW FOR SOME
FORMATION OF PATCHY GROUND FOG JUST BEFORE AND AROUND SUNRISE. SO
WILL INCLUDE A TEMPO REMARK FOR SOME LIGHT FOG FOR ALL THREE RGV
AIRPORTS. ANY FOG THAT FORMS LATER TONIGHT WILL BE PRETTY SHORT
LIVED AND SHOULD DISSIPATE QUICKLY AFTER SUNRISE. EXPECT VFR
CONDITIONS TO PREVAIL THROUGHOUT THE NEXT 24 HOURS.

&&

.PREV DISCUSSION... /ISSUED 534 AM CST THU NOV 27 2014/

DISCUSSION...UPDATED FOR LATEST AVIATION DISCUSSION BELOW.

AVIATION...VISIBILITY AT BROWNSVILLE AND HARLINGEN HAS BEEN
PROBLEMATIC THE LAST FEW HOURS AS SHALLOW GROUND FOG HAS DEVELOPED
DUE TO STRONG RADIATIONAL COOLING AND LIGHT WINDS OVERNIGHT. THE
FOG SHOULD DISSIPATE AS THE SUN RISES. IN ADDITION...A WEAK COLD
FRONT IS EVIDENT MOVING SOUTH ACROSS NORTHERN PORTIONS OF THE AREA
AND SHOULD BRING LIGHT NORTH WINDS AND DRIER AIR IN THE NEXT FEW
HOURS...FURTHER WORKING AGAINST LINGERING FOG. OTHER THAN MORNING
FOG...HOWEVER...CONDITIONS WILL BE VFR TODAY UNDER MOSTLY SUNNY
SKIES AND LIGHT NORTH TO NORTHEAST WINDS.

PREV DISCUSSION... /ISSUED 328 AM CST THU NOV 27 2014/

SHORT TERM /TODAY THROUGH FRIDAY/...SHALLOW GROUND FOG HAS SET UP
NEAR THE COAST OF SOUTHEAST CAMERON COUNTY THIS MORNING...BUT SHOULD
BURN OFF QUICKLY WITH SUN UP. MID LEVEL RIDGING UPSTREAM TO THE
NORTHWEST WILL REMAIN STRONG...SHIFTING SLOWLY EAST AND FLATTENING
SOMEWHAT IN THE SHORT TERM. A WEAKNESS ALOFT OVER NORTH CENTRAL
MEXICO WILL STAY TO THE WEST FOR NOW. OTHERWISE...HIGH PRESSURE
DESCENDING SOUTH FROM THE PLAINS WILL ARRIVE IN THE AREA TODAY...
BRINGING A LIGHT NORTHEAST TO EAST WINDS BUT WITHOUT MUCH OTHER
EFFECT. CONDITIONS WILL REMAIN DRY AND CLEAR WITH HIGH TEMPS NEAR
NORMAL IN THE MID 70S. BY TONIGHT HIGH PRESSURE OVER THE NORTHWEST
GULF WILL BE SHIFTING EAST WITH WINDS VEERING TO SOUTHEAST BY FRI.
LOW TEMPS TONIGHT WILL BE A BIT WARMER IN THE LOWER TO MID 50S BUT
ACTUALLY PRETTY CLOSE TO NORMAL. SKIES WILL BE MOSTLY CLEAR. THE
COMBINATION OF HIGH PRESSURE IN THE GULF AND PRESSURE FALLS IN THE
CENTRAL AND NORTHERN PLAINS WILL SET UP LIGHT SOUTHEAST TO SOUTH
WINDS ON FRIDAY UNDER MOSTLY SUNNY TO PARTLY CLOUDY SKIES FROM A FEW
LOW CLOUDS...THOUGH IT WILL STILL BE PRETTY DRY WITH PWAT WELL BELOW
AN INCH. HIGH TEMPERATURES WILL AGAIN BE IN THE MID 70S.

LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/...
LEE TROUGHING OVER THE CENTRAL PLAINS AND RIDGING OVER THE
NORTHEASTERN AND CENTRAL GULF OF MEXICO WILL LEAD TO A BREEZY
SATURDAY AFTERNOON. TEMPS WILL RUN TO AROUND 80 DEGREES WITH DRY AIR
JUST ABOVE THE BOUNDARY LAYER MIXING DOWN AND REDUCING AFTERNOON
DEWPOINTS WHICH SHOULD RESULT IN A VERY PLEASANT DAY. SIMILAR
CONDITIONS ARE EXPECTED FOR SUNDAY AND MONDAY BUT WIND SPEEDS WILL
DECREASE A FEW MPH FROM ONE DAY TO THE NEXT THROUGH THAT TIME.

00Z GFS/ECMWF AND 00Z GFS ENSEMBLES ARE IN PRETTY GOOD AGREEMENT SENDING A
FRONT INTO SOUTH TEXAS ON MONDAY AFTERNOON. THE AIRMASS CHANGE IS
DRIVEN BY A MODEST INCREASE IN LOW LEVEL RIDGING OVER THE PLAINS AND
WILL BE FIGHTING AGAINST EAST TO SOUTHEASTERLY WINDS IN THE
850/925MB LAYER. THIS RESULTS IN THE FRONT WASHING OUT/STALLING NEAR
THE AREA. FIRST...MOISTURE WILL BE VERY LIMITED ABOVE ABOUT 900MB SO
SIGNIFICANT PRECIP/SHOWERS APPEAR UNLIKELY. DID CONTINUE 20 PCT POPS
FOR SHOWERS MAINLY EAST OF HIGHWAY 281 DURING THE DAY ON TUESDAY.
OTHERWISE THE FORECAST REMAINS PRETTY DRY SAVE THE TYPICAL SPRINKLES
SHOWERS EARLY IN THE MORNING OVER THE GULF AND ALONG THE COAST. KEPT
A SLIGHT COOLDOWN IN THE FORECAST TUESDAY WITH COOLER AIR BEHIND THE
FRONT WORKING IN...AT LEAST BRIEFLY.

SOUTHEASTERLY WINDS LOOK TO WORK BACK INTO PLACE BY WEDNESDAY WITH
CONDITIONS RETURNING ABOUT WHERE THEY WERE EARLIER IN THE WEEK.
HIGHS WILL BE ABOUT 77 TO 81 WITH SOME HUMIDITY/LOW LEVEL MOISTURE
BUT NOTHING PARTICULARLY OPPRESSIVE. RAIN CHANCES APPEAR VERY LOW.
BOTH THE OPERATIONAL GFS/ECMWF HAVE SLOWED/MODIFIED THE SYNOPTIC
PICTURE THURSDAY INTO FRIDAY TO KEEP THE PROSPECTS OF
ANOTHER...STRONGER FRONT AT BAY FOR NOW. /68-JGG/

MARINE...
TODAY THROUGH FRIDAY...LIGHT SOUTH WINDS WILL BECOME LIGHT NORTHEAST
TODAY AS PLAINS HIGH PRESSURE MAKES ITS WAY SOUTH INTO THE NORTHWEST
GULF OF MEXICO. THE HIGH PRESSURE WILL SHIFT RAPIDLY EAST HOWEVER...
AND BY FRIDAY LIGHT WINDS WILL AGAIN BE OUT OF THE SOUTHEAST. WAVE
HEIGHTS WILL REMAIN LOW TO MODERATE THROUGH 36 HOURS.

FRIDAY NIGHT THROUGH TUESDAY...
SOUTHEAST WINDS WILL INCREASE THROUGH SATURDAY AND SATURDAY NIGHT.
AT LEASE EXERCISE CAUTION CONDITIONS ARE FORECAST WITH SMALL CRAFT
ADVISORY LEVEL WINDS AND SEAS POSSIBLE SATURDAY NIGHT. WIND SPEEDS
ARE FORECAST TO BECOME MORE MODERATE ON SUNDAY AND MONDAY WITH THE
LIGHTEST WINDS FORECAST ON TUESDAY AS A WEAK FRONT APPROACHES FROM
CENTRAL TEXAS. SEAS ARE FORECAST TO REMAIN LOW TO MODERATE DURING
THIS TIME.

&&

.PRELIMINARY POINT TEMPS/POPS...
BAYVIEW/PORT ISABEL  59  75  63  77 /   0  10  10  10
BROWNSVILLE          57  76  61  77 /   0  10  10  10
HARLINGEN            55  76  59  78 /   0  10  10  10
MCALLEN              54  77  58  79 /   0  10   0  10
RIO GRANDE CITY      53  76  55  79 /   0  10   0   0
SOUTH PADRE ISLAND   63  74  67  76 /   0  10  10  10

&&

.BRO WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...NONE.
&&

$$

THIS PRODUCT IS ALSO AVAILABLE ON THE WEB AT:
HTTP://WEATHER.GOV/RGV

SHORT TERM...60
LONG TERM...55
GRAPHICAST/UPPER AIR...MARTINEZ





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