Area Forecast Discussion
Issued by NWS Austin/San Antonio, TX
Issued by NWS Austin/San Antonio, TX
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701 FXUS64 KEWX 302320 AFDEWX Area Forecast Discussion National Weather Service Austin/San Antonio TX 620 PM CDT Sun Jun 30 2024 ...New AVIATION... .SHORT TERM... (Tonight through Monday night) Issued at 158 PM CDT Sun Jun 30 2024 Radar trends show some isolated showers and storms over the Rio Grande plains near Laredo, with a few light showers trying to develop over the coastal plains. Hi-res models generally show the two above mentioned areas will be favored for isolated convection, so we will continue to mention a low chance (20%) for showers and storms in these areas through the afternoon hours. Otherwise, temperatures at 18Z (1 PM) are a little behind what we saw at the same time yesterday. We still have some time to heat up and with dewpoints staying fairly high, we will keep the current Heat Advisory intact until 7 PM. Another warm night is in store across south central Texas, with lows ranging from the lower 70s in the Hill Country to the upper 70s/near 80 along the Rio Grande. On Monday, the above normal heat will continue. Air temperatures are forecast to rise a bit compared to today, with highs ranging from the mid 90s to near 102 degrees. We do expect to see a little better mixing of low-level moisture and this should keep peak heat index values just below the Heat Advisory threshold (108 degrees) for counties generally along and east of the I-35 corridor. However, the slightly drier air will likely allow air temperatures to increase a degree or two. For now, we expect to see daytime high temperatures just under the Heat Advisory threshold of 103 degrees. With this in mind, we will hold off on the issuance of a Heat Advisory on Monday. We will also keep the forecast dry with some subsidence noted on the northern edge of the area of low pressure in the Bay of Campeche. && .LONG TERM... (Tuesday through Sunday) Issued at 158 PM CDT Sun Jun 30 2024 By Tue AM the center of the 700-500MB ridge will be across the Lower MS Valley. The clockwise flow around the ridge will keep the S-SE winds across our region and maintain the status quo on temps. Will be carrying no POP for the region through mid week although areas across our Coastal Zones from Karnes, DeWitt, and Lavaca Counties will stand at least a low chance for some seabreeze generated convection in the afternoons. As of right now...that chance is below 20 percent and thus will not be mentioned but just be aware that a popup SH/TS is always possible if the seabreeze gets active. As we continue to dry out, we should start to see the Dew Point temps also trend down. The question is how much and will it be enough to keep us below Heat Advisory levels. Will likely have to play the Heat Advisory game day by day as usual but basically because of the ridge centered to our east....we are not expecting any oppressive heat through the extended forecast...just good ole Texas July heat. Areas along and east of I-35 will be the areas to look for the borderline Air temp/HI values for the Heat Advisories. A digging trough across the northern U.S. on Thursday will set up a cold front to push south into the Southern Plains of OK and N. TX. While we are not expecting this front to make it into our region...Portions of NW TX and areas to our N may get some rain activity by the end of the week on Friday. Models generated some light POP over the far western zones near Val Verde County and kept that in the forecast for Fri/Friday Night. Some light pop has also been added to the Coastal Plains late in the week into next weekend as tropical moisture might be increasing in the Gulf from Beryl. While its still to early to tell what Cat4 Beryl will be doing by this time next week...models have been consistent in at least taking into the Yucatan and then farther west into the southern Gulf. The messaging right now is to be aware...and keep watching the forecast daily for changes/updates to Beryl`s track. We have many days to watch his progress. && .AVIATION... (00Z TAFS) Issued at 620 PM CDT Sun Jun 30 2024 ISOLD SHRA over South Central Texas will dissipate by 01Z with loss of peak heating. No impacts are expected at the sites. VFR skies will prevail tonight through Monday night. However, a period of MVFR CIGs is expected at KSAT/KSSF overnight into early morning with SCT MVFR at KAUS/KDRT. Breezy SE winds prevail this evenings. Then, winds become lighter and more VRBL, perhaps SW at the I-35 sites overnight into morning while remain breezy SE at KDRT. SE winds prevail late morning through evening on Monday, with some gustiness at KDRT. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 78 102 79 102 / 0 0 0 0 Austin Bergstrom Intl Airport 76 100 75 101 / 0 0 0 0 New Braunfels Muni Airport 77 100 75 101 / 0 0 0 0 Burnet Muni Airport 77 100 77 100 / 0 0 0 0 Del Rio Intl Airport 81 103 81 105 / 10 0 0 0 Georgetown Muni Airport 77 100 77 100 / 0 0 0 0 Hondo Muni Airport 75 99 74 100 / 0 0 0 0 San Marcos Muni Airport 76 99 74 100 / 0 0 0 0 La Grange - Fayette Regional 77 97 76 97 / 0 0 0 0 San Antonio Intl Airport 77 100 77 100 / 0 0 0 0 Stinson Muni Airport 77 101 76 102 / 0 0 0 0 && .EWX WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 7 PM CDT this evening for Atascosa-Bastrop- Bexar-Caldwell-Comal-De Witt-Fayette-Frio-Gonzales-Guadalupe-Hays- Karnes-Lavaca-Lee-Travis-Williamson-Wilson. && $$ Short-Term...Platt Long-Term...09 Aviation...04