060
FXUS64 KBRO 171105
AFDBRO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BROWNSVILLE TX
605 AM CDT SUN AUG 17 2025
..NEW AVIATION
DISCUSSION
ISSUED AT 1022 PM CDT SAT AUG 16 2025
HEAT IS LIKELY TO REMAIN THE MAIN FOCUS OF THE FORECAST INTO THE
BEGINNING OF THIS UPCOMING WEEK AS A MID-LEVEL HIGH PRESSURE OVER
EASTERN TEXAS GRADUALLY SLIPS NORTH OF OUR REGION SUNDAY NIGHT,
MOVING WEST-NORTHWESTWARD AND OVER THE FOUR CORNERS BY TUESDAY.
RESULTING SUBSIDENCE ALOFT IS EXPECTED TO SUPPRESS PROBABILITIES OF
AFTERNOON CONVECTION TO LESS THAN 15% THROUGH MONDAY. AS THE HIGH
MOVES FURTHER NORTHWESTWARD, MID-LEVEL TROUGHING OVER THE GULF
EXTENDS TO EASTERN AND SOUTHERN TEXAS, INCREASING PROBABILITIES FROM
A LOW (20%) CHANCE ON TUESDAY AFTERNOON TO A LOW-MEDIUM TO LIKELY
(30-50%) CHANCE EACH AFTERNOON BEGINNING WEDNESDAY AND LASTING
THROUGH THE WEEKEND AS NEAR AVERAGE PWAT VALUES TREND UPWARD TO
NEAR AND ABOVE AVERAGE (> 2.0 INCHES). SHOWERS AND THUNDERSTORMS
ARE EXPECTED TO BE DIURNALLY DRIVEN ALONG THE SEABREEZE
BOUNDARIES, OCCURRING LATE MORNING INTO THE AFTERNOON HOURS, WITH
THE HIGHEST PROBABILITIES NEAR AND EAST OF US-281. CONVECTION IS
LIKELY TO BE BRIEF IN NATURE, THOUGH ABLE TO PRODUCE HEAVY RAIN,
FREQUENT LIGHTNING AND STRONGER GUSTS.
NEAR TO SLIGHTLY ABOVE AVERAGE HIGHS CONTINUE INTO WEDNESDAY, WITH
UPPER 90'S ACROSS INLAND PORTIONS ALONG AND EAST OF I-69 E WHILE
NEARLY WIDESPREAD LOWER 100'S CONTINUE TO THE WEST. AS CLOUDS
INCREASE INTO WEDNESDAY AND THURSDAY, MOST OF DEEP SOUTH TEXAS AND
THE RIO GRANDE VALLEY ARE LIKELY TO RANGE FROM THE MID TO UPPER
90'S. MID 80'S TO LOWER 90'S CONTINUE FOR THE ISLAND AND COASTAL
AREAS, RESPECTIVELY. OVERNIGHT LOWS IN THE 70'S INLAND AND LOWER
80'S NEAR THE COAST PERSIST. MOSTLY MODERATE (LEVEL 2/4), WITH
POCKETS OF MAJOR (LEVEL 3/4), HEAT RISKS MAINTAIN INTO MONDAY BEFORE
RANGING FROM MINOR (LEVEL 1/4) TO MODERATE TUESDAY AND ONWARD.
AFTERNOON HEAT INDICES REMAIN BETWEEN 100-110 DEGF, WITH A FEW
LOCATIONS POSSIBLY SURPASSING 110 DEGF FOR A BRIEF PERIOD OF TIME ON
SUNDAY AND MONDAY FOR PORTIONS OF THE COASTAL COUNTIES AND NEAR THE
RIO GRANDE IN THE MID AND UPPER RIO GRANDE VALLEY, THOUGH LIKELY
KEEPING BENEATH SPS CRITERIA.
A LOW RISK OF RIP CURRENTS CONTINUES TONIGHT AND THROUGH THE
DAY SUNDAY.
AVIATION
(12Z TAFS)
ISSUED AT 602 AM CDT SUN AUG 17 2025
THROUGH 12Z MONDAY.....COPIOUS AMOUNTS OF LOW LEVEL MOISTURE FROM
RECENT RAINS COUPLED WITH LIGHT WINDS AND MAINLY CLEAR SKIES
OVERNIGHT HAVE RESULTED IN THE DEVELOPMENT OF SOME LOW STRATUS
AND/OR MIST/FOG OVER PARTS OF THE REGION. LATEST GOES-19 NIGHTTIME
FOG AND MICROPHYSICS CHANNELS, AS OF THIS UPDATE, REVEAL SOME LOW
STRATUS AND MIST/FOG OVER PARTS OF THE AREA. KHRL WAS REPORTING LIFR
CONDITIONS DUE TO 3/4 STATUE MILE VISIBILITIES AND CIGS BETWEEN 500-
1,000 FEET AGL. HAVE APPLIED A TEMPO GROUP FROM 10Z-14Z FOR KHRL TO
ACCOUNT FOR THE MIST/FOG AND/OR LOW STRATUS.
ANY MIST/FOG/LOW STRATUS FROM THIS EARLY THIS MORNING WILL GRADUALLY
SCOUR OR BURN OFF MID TO LATE MORNING GIVING WAY TO A RETURN TO
MOSTLY VFR CONDITIONS AT ALL OF THE LOCAL TERMINALS THROUGH THE REST
OF THE DAY. IT'S POSSIBLE THAT THERE COULD BE A FEW MVFR CLOUDS
AROUND, ESPECIALLY THIS MORNING.
LATER TONIGHT, MOST TAF SITES WILL REMAIN VFR, HOWEVER, THERE MAY
ONCE AGAIN BE A LOW, NON-ZERO PROBABILITY FOR SOME PATCHY MIST/FOG
OR EVEN LOW STRATUS DEVELOPING DUE TO NARROWING DEWPOINT DEPRESSIONS
FROM THE COMBINATION OF STILL LARGE AMOUNT OF LOW LEVEL MOISTURE IN
PLACE, SOME RADIATIONAL COOLING FROM CLEARING SKIES, AND LIGHT WINDS.
WINDS WILL CONTINUE OUT OF THE SOUTHEAST 5-15 KTS THROUGH THE 12Z
TAF PERIOD. WINDS COULD GUST BETWEEN 20-25 KTS DURING THE AFTERNOON
HOURS BEFORE WANING LATER IN THE EVENING.
MARINE
ISSUED AT 1022 PM CDT SAT AUG 16 2025
GENTLE TO MODERATE SOUTHEASTERLY WINDS AND SLIGHT TO MODERATE (2-3
FEET) SEAS BECOME LIGHT TO GENTLE, AND VARIABLE AT TIMES, WITH
SLIGHT (1-2 FEET) SEAS BY MONDAY. SHOWERS AND THUNDERSTORMS INCREASE
OVER THE EASTERN PORTIONS OF THE OFFSHORE (20-40 NM) GULF WATERS ON
TUESDAY, BECOMING A DAILY LOW TO MEDIUM (20-40%) CHANCE ACROSS ALL
LOWER TEXAS COASTAL WATERS BY WEDNESDAY. HEAVY RAIN, FREQUENT
LIGHTNING AND STRONGER WINDS ARE POSSIBLE IN THE STRONGEST OF
CONVECTION.
PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 96 79 96 78 / 10 0 10 0
HARLINGEN 98 75 98 74 / 10 0 10 0
MCALLEN 101 78 102 78 / 10 0 10 0
RIO GRANDE CITY 103 77 103 76 / 0 0 0 0
SOUTH PADRE ISLAND 88 81 88 81 / 10 0 10 0
BAYVIEW/PORT ISABEL 93 78 93 77 / 10 0 10 0
BRO WATCHES/WARNINGS/ADVISORIES
TX...NONE.
GM...NONE.
SHORT TERM...65-IRISH
LONG TERM....65-IRISH
AVIATION...23-EVBUOMA
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