988
FXUS64 KBRO 191104
AFDBRO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BROWNSVILLE TX
604 AM CDT TUE AUG 19 2025
..NEW AVIATION
DISCUSSION
ISSUED AT 1040 PM CDT MON AUG 18 2025
THE MID-LEVEL RIDGE CONTINUES TO RETREAT INTO THE FOUR CORNERS BY
LATE WEEK, AS HURRICANE ERIN SWINGS BY THE US EAST COAST. THIS
LEAVES WEAKER PRESSURE AT 500MB ALONG THE WESTERN GULF. MOISTURE
BUILDS THROUGH THE WEEKEND INTO EARLY NEXT WEEK AS A WEAK COASTAL
LOW AND TROUGH PERSIST ALONG THE LOWER TEXAS COAST. THIS HELPS SET
UP MULTIPLE ROUNDS OF BENEFICIAL RAINFALL EACH DAY THROUGH THE
FORECAST PERIOD, ESPECIALLY WEDNESDAY THROUGH SUNDAY.
OVERALL, THERE DOES NOT APPEAR TO BE MUCH FLOW AT THE SURFACE,
LEAVING THE SEA BREEZE TO BE THE MAIN CATALYST FOR INITIAL
CONVECTION AND MEANDERING OR COLLIDING OUTFLOW BOUNDARIES HELPING
TO SPREAD THE COVERAGE. SLOWER MOVING STORMS WITH ABUNDANT
MOISTURE ALSO INCREASES THE FLOODING RAIN THREAT. AT THE MOMENT,
WPC HAS KEPT A MARGINAL RISK (LEVEL 1 OF 4) OF EXCESSIVE RAINFALL
MAINLY NORTH OF THE CWA THURSDAY AND FRIDAY, BARELY REACHING INTO
ZAPATA COUNTY.
SEVERAL CAMS WERE HINTING AT STRONG THUNDERSTORMS WORKING
SOUTHWEST ACROSS THE RANCHLANDS AND INTO THE BRUSH COUNTRY OR
UPPER VALLEY LATE TUESDAY AFTERNOON INTO TUESDAY EVENING. THE
GUIDANCE HAS DIMINISHED THE THREAT SOME THIS EVENING, BUT WOULD BE
SOMETHING TO MONITOR. AS THE WEEK PROGRESSES, ABUNDANT CLOUD
COVER AND BETTER RAIN CHANCES LIMIT PEAK HEATING AND STIFLE
INSTABILITY.
TEMPERATURES REMAIN NEAR NORMAL AND HOT TUESDAY, WITH HIGHS
GRADUALLY DROPPING A DEGREE OR TWO EACH DAY THROUGH THE FORECAST
PERIOD AND LOWS REMAINING WARM. EXPECT A MODERATE (LEVEL 2 OF 4)
HEAT RISK EACH DAY. PATCHY SHALLOW FOG OR FIELD FOG MAY DEVELOP
EACH NIGHT AND EARLY MORNING, ESPECIALLY ACROSS THE EASTERN
RANCHLANDS AND COASTAL COUNTIES.
AVIATION
(12Z TAFS)
ISSUED AT 604 AM CDT TUE AUG 19 2025
THROUGH 12Z WEDNESDAY....FLYING CONDITIONS WILL MAINLY BE VFR
THROUGH THE 12Z TAF PERIOD. THERE COULD BE A FEW MVFR CLOUDS AROUND
FROM TIME TO TIME.
LIGHT AND VARIABLE TO CALM WINDS THIS MORNING WILL BECOME EAST-
SOUTHEASTERLY WITH WIND SPEEDS RANGING BETWEEN 5-10 KTS TODAY. LATER
THIS EVENING/TONIGHT, WINDS WILL TREND TOWARDS LIGHT AND VARIABLE TO
CALM.
MARINE
ISSUED AT 1040 PM CDT MON AUG 18 2025
WITH GENERALLY WEAK FLOW ACROSS COASTAL WATERS, EXPECT GENERALLY
FAVORABLE MARINE CONDITIONS THROUGH THE FORECAST PERIOD. THE
CHANCE OF SHOWERS AND THUNDERSTORMS PERSISTS OFFSHORE INTO NEXT
WEEK, WORKING CLOSER TO THE COAST EACH NIGHT AND EARLY MORNING.
PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 95 78 95 78 / 20 20 40 10
HARLINGEN 97 74 95 73 / 20 20 50 10
MCALLEN 102 78 99 77 / 20 10 50 10
RIO GRANDE CITY 103 78 99 76 / 10 20 50 20
SOUTH PADRE ISLAND 88 80 88 80 / 10 20 30 10
BAYVIEW/PORT ISABEL 92 77 92 76 / 10 20 40 10
BRO WATCHES/WARNINGS/ADVISORIES
TX...NONE.
GM...NONE.
SHORT TERM...56-HALLMAN
LONG TERM....56-HALLMAN
AVIATION...23-EVBUOMA
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