683
FXUS64 KBRO 200534 AAA
AFDBRO
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE BROWNSVILLE TX
1234 AM CDT THU AUG 20 2026
..NEW AVIATION
KEY MESSAGES
UPDATED AT 1233 AM CDT THU AUG 20 2026
- HOT AND RAIN-FREE CONDITIONS WILL CONTINUE THROUGH EARLY NEXT WEEK.
- MODERATE (LEVEL 2 OF 4) TO MAJOR RISK (3 OF 4) OF HEAT-RELATED
IMPACTS THROUGH THE PERIOD WITH PEAK AFTERNOON HEAT INDICES
GENERALLY BETWEEN 105 TO AROUND 110 DEGREES.
- THE COMBINATION OF LOW MINIMUM RELATIVITY HUMIDITY VALUES, DRY
FUELS, AND VERY HOT TEMPERATURES COULD LEAD TO THE POTENTIAL
FOR RAPID WILDFIRE SPREAD THROUGH THE PERIOD.
DISCUSSION
ISSUED AT 1035 PM CDT WED AUG 19 2026
A MID-LEVEL RIDGE ANCHORED OVER THE FOUR CORNERS REGION FRIDAY
WILL GRADUALLY MOVE SOUTHEASTWARD OVER TEXAS THIS WEEKEND INTO
EARLY NEXT WEEK. THIS WILL CONTINUE TO LEAD TO STRONG SUBSIDENCE
ACROSS DEEP SOUTH TEXAS WITH VERY HOT AND RAIN-FREE CONDITIONS
THROUGH FORECAST PERIOD. DAILY HIGH TEMPERATURES ARE EXPECTED TO
REACH THE UPPER 90S TO AROUND 105 DEGREES, EXCEPT NEAR THE COAST.
THE COMBINATION OF THE VERY HOT TEMPERATURES AND ELEVATED DEWPOINT
TEMPERATURES WILL SUPPORT HEAT INDICES GENERALLY BETWEEN 105 TO
110 DEGREES EACH AFTERNOON. HEAT INDICES MAY BRIEFLY REACH 111+ AT
A FEW LOCATIONS IN THE AFTERNOON, BUT TEMPERATURES SHOULD REMAIN
JUST BELOW HEAT ADVISORY CRITERIA EACH DAY. WIDESPREAD MODERATE
(LEVEL 2 OF 4) TO MAJOR (LEVEL 3 OF 4) HEAT RISK EXPECTED THROUGH
LATE WEEK INTO THE WEEKEND.
THE COMBINATION OF LOW MINIMUM RELATIVITY HUMIDITY VALUES, DRY
FUELS, AND VERY HOT TEMPERATURES COULD LEAD TO THE POTENTIAL FOR
RAPID WILDFIRE SPREAD THROUGH THE PERIOD.
AVIATION
(06Z TAFS)
ISSUED AT 1233 AM CDT THU AUG 20 2026
VFR WILL PREVAIL AT THE AERODROMES THROUGH THE NEXT 24 HOURS.
MARINE
ISSUED AT 1035 PM CDT WED AUG 19 2026
A SLIGHTLY ENHANCED PRESSURE GRADIENT OVER THE WESTERN GULF MAY
PRODUCE BRIEF SMALL CRAFT SHOULD EXERCISE CAUTION CONDITIONS ON THE
LAGUNA MADRE AT TIMES FRIDAY THROUGH THE WEEKEND. OTHERWISE, MARINERS
CAN EXPECT MODERATE SOUTH TO SOUTHEAST WINDS AND SEAS OF 2 TO 3 FEET
THROUGH THE PERIOD.
PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 98 81 98 79 / 0 0 0 0
HARLINGEN 101 78 103 75 / 0 0 0 0
MCALLEN 103 81 104 79 / 0 0 0 0
RIO GRANDE CITY 104 79 105 76 / 0 0 0 0
SOUTH PADRE ISLAND 90 82 90 81 / 0 0 0 0
BAYVIEW/PORT ISABEL 97 80 98 78 / 0 0 0 0
BRO WATCHES/WARNINGS/ADVISORIES
NONE.
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