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Falcon, Texas Weather Forecast Discussion

317
FXUS64 KBRO 222342 AAA
AFDBRO

Area Forecast Discussion...UPDATED National Weather Service Brownsville TX 642 PM CDT Mon Sep 22 2025

...New AVIATION...

.DISCUSSION... Issued at 1217 PM CDT Mon Sep 22 2025

The main focus for the forecast continues to be the unsettled weather over Deep South Texas and the Rio Grande Valley. While PWAT values continue to remain around 2 inches indicating that the environment remains moist and favorable for the development of showers and thunderstorms. While the rain chances are generally in the range low to medium (20 to 50%), the chances for rain during the day on Thursday are still very uncertain at this point. While the models have very high chances for rain, those chances are very dependent on what happens with a frontal boundary that could come through the region, stall out over the area, or even remain to the north as well. Because there continues to remain so much uncertainty with this part of the forecast, PoPs have been lowered. At this point, medium (40-70%) chances for rain are expected for Thursday, however this is likely to change depending on what occurs with the front. Will need to continue to monitor the model trends to see how this frontal boundary evolves.

As for the temperatures for the forecast period. Highs are typically in the 90s for the region with a few places in Western Starr and Zapata reaching into the triple digits. The area is generally in a moderate (level 2 of 4) for Heat Risk, however tomorrow and Wednesday parts of the region do go into major (level 3 of 4) for Heat Risk. While the heat indices do remain below the criteria for Heat Advisory, an SPS for elevated heat indices could be issued for parts of the area.

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.AVIATION... (00Z TAFS) Issued at 632 PM CDT Mon Sep 22 2025

A few passing clouds and light southeast winds prevail across Deep South Texas early this evening. There is a low chance of some MVFR ceilings late tonight as low level clouds increase. Otherwise, VFR conditions are expected for the next 24 hours. Isolated to scattered showers and thunderstorms will develop on Tuesday, mainly along the seabreeze. However, will not mention convection at this time due to low confidence of activity impacting the aerodromes. Mainly light southeast winds will persist through the period, some gusts around 20 knots will be possible late Tuesday morning into the afternoon.

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.MARINE... Issued at 1217 PM CDT Mon Sep 22 2025

Marine conditons are generally expected to be favorable with mostly light to moderate southeasterly winds and low seas around 2 to 3 feet. While showers and thunderstorms chances are expected to be generally low to moderate (20 to 50%) for the forecast period. There is a greater chance for more showers and thunderstorms on Thursday depending on what occurs with a frontal boundary that could move through the Lower Texas coast on Thursday.

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.PRELIMINARY POINT TEMPS/POPS... BROWNSVILLE 79 93 80 94 / 10 30 10 40 HARLINGEN 76 96 76 96 / 0 20 0 40 MCALLEN 79 99 80 99 / 10 10 0 30 RIO GRANDE CITY 76 100 77 101 / 0 0 0 20 SOUTH PADRE ISLAND 83 89 83 89 / 20 20 20 40 BAYVIEW/PORT ISABEL 78 92 79 92 / 10 20 10 40

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

$$

SHORT TERM...64-Katz LONG TERM....64-Katz AVIATION...63-KC

NWS BRO Office Area Forecast Discussion

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