Area Forecast Discussion
Issued by NWS Brownsville, TX
Issued by NWS Brownsville, TX
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904 FXUS64 KBRO 031143 AAA AFDBRO Area Forecast Discussion...UPDATED National Weather Service Brownsville TX 643 AM CDT Fri May 3 2024 ...New AVIATION... .SHORT TERM... (Today through Saturday) Issued at 357 AM CDT Fri May 3 2024 A 500 mb disturbance will approach the western portion of CWA this afternoon. At the surface, the southern extension of the Texas dryline will likely lie just to the west of the area today, extending south into Mexico along the Sierra Madre Oriental range. The combination of a very moist low-level airmass, daytime heating and mid to upper level energy will support the develop of convection over neighboring Mexico. Forecast soundings from along the Rio Grande River suggest SBCAPE values of 2500-4000 J/kg late this afternoon. The isolated to scattered showers and thunderstorms may drift into Zapata, Starr, and Jim Hogg counties later this afternoon and evening. SPC has placed the County Warning Area in a general thunderstorm risk area, generally along and east of US 281/I-69C, with the portions of the Rio Grand Plains and the Upper Valley in a marginal thunderstorm risk for today and tonight. Large hail and locally damaging wind gusts will be the main threats. There is a low chance that these stronger supercells will move into the western portions of the CWA this afternoon and evening. SPC has all of Deep South Texas outlined in a general thunderstorm risk for Saturday. Otherwise, increasing low level moisture and light winds this morning may support patchy light fog, mainly across the Northern Ranchlands and near/over marine areas. Additionally, above normal temperatures will continue through the short-term with highs generally ranging from the low to mid 90s, except for the 80s near the coast, today and Saturday. Overnight temperatures will be warm with lows in the mid to upper 70s, which is a blend of the NBM/CONSShort. Southeast winds will remain moderate to breezy. Elevated seas will result in a Moderate Risk of rip currents at the local beaches today through Saturday. && .LONG TERM... (Saturday Night through Thursday) Issued at 357 AM CDT Fri May 3 2024 Increasing and prolonged heat will be the main concern during this portion of the total forecast. Steadily rising daytime highs will occur throughout the period, with well above normal values likely in the Tuesday through Thursday time frame. Temperatures will near established HEAT ADVISORY criteria on Tuesday, and may reach or surpass the threshold for Wednesday and Thursday as a dryline nudges into the BRO CWFA from the west. Additionally, an enhanced pressure gradient will produce a breezy to windy onshore flow, providing some measure of relief from the heat, especially in shaded areas. However, the strength of the wind will not near or exceed established WIND ADVISORY criteria. && .AVIATION... (12Z TAFS) Issued at 636 AM CDT Fri May 3 2024 Light southeast winds and widespread IFR/MVFR conditions prevail across Deep South Texas early this morning. The increase in the low level moisture and light winds have allowed for patchy fog to develop across portions of the region this morning. MVFR ceilings are expected to linger through mid to late morning. VFR conditions are expected to return this afternoon, especially at MFE. MVFR ceilings are expected to develop again later this evening into tonight. && .MARINE... (Today through Saturday) Issued at 357 AM CDT Fri May 3 2024 Moderate to fresh southeast winds and moderate to sometimes marginally high seas will prevail along the lower Texas Coast through the period. Small Craft Exercise Caution conditions will be likely for portions or all of the lower Texas coastal waters through Saturday. (Saturday Night through Thursday) An enhanced pressure gradient will exist over the western Gulf of Mexico throughout the period. Breezy to strong winds and moderate to rough seas will prevail along the Lower Texas Coast, with both Small Craft Exercise Caution and Small Craft Advisory likely to be needed. && .PRELIMINARY POINT TEMPS/POPS... BROWNSVILLE 90 77 88 76 / 20 10 0 0 HARLINGEN 91 75 91 74 / 20 10 0 0 MCALLEN 93 77 93 77 / 20 10 0 10 RIO GRANDE CITY 93 77 94 76 / 20 10 10 10 SOUTH PADRE ISLAND 82 77 81 76 / 20 10 0 0 BAYVIEW/PORT ISABEL 87 76 86 74 / 20 10 0 0 && .BRO WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ SHORT TERM...63-KC LONG TERM....66-Tomaselli AVIATION...63-KC