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Falcon, Texas Weather Forecast Discussion

052
FXUS64 KBRO 210545 AAA
AFDBRO

Area Forecast Discussion...UPDATED National Weather Service Brownsville TX 1245 AM CDT Sun Sep 21 2025

...New AVIATION...

.DISCUSSION... Issued at 1043 PM CDT Sat Sep 20 2025

The focus of the forecast for the next 7 days across Deep South Texas and the Rio Grande Valley will be a mix of increasing heat risks into the middle of this upcoming week as well as unsettled weather. Slight shortwave troughing along the eastern periphery of a mid-level high over northwestern Mexico is likely to result in a low to medium (20-50%) chance of rain today from convection, mostly east of Zapata County. As is the ongoing diurnal pattern throughout the forecast, convection is likely to develop along the seabreeze boundary by mid-day in the coastal areas, spreading westward into the afternoon and early evening hours, bringing the possibility of lightning, heavy rain and localized gusty winds, maximizing in coverage east of US-281 with probabilities highest along the coast before activity ceases beyond sunset. Overnight tonight and through Monday, mid-level ridging increases subsidence over the CWA as the mid-level high expands and shifts eastward to central-northern Mexico, decreasing PoP`s to a low (15-30%) chance east of US-281 on Monday and Tuesday. Meanwhile, an enhanced upper level jet over the Rockies induces a cold front arriving into southern-central Texas on Wednesday, increasing PoP`s across the entire region to a low to medium (30-60%) chance into Thursday as the front may stall across the CWA. If the front reaches our region, a wind shift out of the east-northeast is possible on Thursday and Friday. Following, mid- level ridging behind a departing trough over the eastern CONUS decreases PoP`s from a low to medium (30-40%) chance on Friday to a low (20-30%) chance over the weekend.

Afternoon high temperatures increase from near to slightly above average temperatures today to as much as 5-7 degrees F above average further inland, perhaps even warmer, tomorrow through Wednesday as highs peak into the mid/upper 90s across all of inland Deep South Texas, even surpassing 100 degrees F for portions of the Rio Grande Plains as well as the mid and upper Rio Grande Valley. This will increase heat risks from minor to moderate (levels 1 and 2 of 4) today to mostly moderate (level 3 of 4) tomorrow, with pockets of moderate expanding in coverage across the Rio Grande Valley and the Rio Grande Plains by Tuesday and Wednesday. Increased cloud coverage Thursday and drier air infiltrating the region over the weekend is currently expected to result in a range of minor to moderate on Thursday to mostly minor over the weekend. SPS`s may be possible Monday through Wednesday due to afternoon heat indices reaching 108 degrees F, or warmer, for a few hours in the afternoon.

The forecast described above reflects the latest blend of models. However, it should be noted that the probabilities of rain are subject to change, particularly by the middle and later part of the week. The ensemble runs of the 18Z GFS and ECMWF indicate probabilities of rain not increasing until Wednesday evening, according to the ECMWF, which has a more aggressive southward push of the front through the region on Thursday, with PoP`s mostly diminished by Friday afternoon, whereas the GFS stalls the front across the CWA on Friday with increased PoP`s Thursday into Saturday. Therefore, confidence in resulting temperatures is low, medium at best, for Wednesday onward, but confidence is likely to increase over the next few days.

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.AVIATION... (06Z TAFS) Issued at 1242 AM CDT Sun Sep 21 2025

VFR will generally prevail at the aerodromes through the next 24 hours. A TEMPO has been included for the possibility of convection, and is based on the HRRR model.

&&

.MARINE... Issued at 1043 PM CDT Sat Sep 20 2025

Slight to moderate (2-3 ft) seas prevail into next week as a result of gentle to moderate southeasterly-southerly winds, becoming variable by Thursday. Chances of showers and thunderstorms continue.

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.PRELIMINARY POINT TEMPS/POPS... BROWNSVILLE 78 93 79 93 / 20 30 20 30 HARLINGEN 74 95 75 96 / 10 30 10 20 MCALLEN 78 98 78 99 / 10 20 10 20 RIO GRANDE CITY 75 99 76 100 / 10 10 0 10 SOUTH PADRE ISLAND 81 88 82 89 / 30 30 30 30 BAYVIEW/PORT ISABEL 77 92 78 92 / 20 30 20 30

&&

.BRO WATCHES/WARNINGS/ADVISORIES...None.

&&

$$

NWS BRO Office Area Forecast Discussion

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