FXUS64 KEWX 210556 AAC AFDEWX Area Forecast Discussion...UPDATED National Weather Service Austin/San Antonio TX 1256 AM CDT Sun Jun 21 2026 ...New SHORT TERM, LONG TERM, AVIATION... .KEY MESSAGES... - Dry and warm for the most part with isolated to scattered shower and thunderstorm activity over parts of the Coastal Plains on Sunday. - Warmer temperatures through the work week. A Heat Advisory may be needed for the Coastal Plains on Monday afternoon. - Dry and warm for most of the work weekend into next weekend. && .SHORT TERM... (Today through Monday) Issued at 1250 AM CDT Sun Jun 21 2026 Any shower and thunderstorm activity for the overnight hours are forecast to happen along the Rio Grande, portions of the southern Edwards Plateau, and Coastal Plains areas. Isolated activity at best across South Central Texas through the period. Overnight lows are forecast to range from the low to upper 70s under mostly cloudy skies. Much drier weather conditions are forecast during the day on Sunday with isolated showers and maybe a thunderstorm or two across portions of the Coastal Plains. Highs temperatures are forecast to reach the upper 80s over parts of the southern Edwards Plateau and Hill Country while the rest of the local area stays between the low to mid 90s. Cloud coverage is going to play a big role as far as ambient temperatures and feel-like temperatures get. Heat index values are likely to run between 100 to 106 along the I-35 corridor and Coastal Plains. Can't rule out a few spots getting into the 108 mark for an hour or two. We will monitor and make changes and updates accordingly. Overnight lows stay warm areawide and around the mid 70s. Dry weather and warmer temperatures are forecast for Monday as an upper level ridge develops over northern Mexico. Monday's highs are forecast to reach the low 90s over portions of the southern Edwards Plateau and Hill Country with the rest of the local area reaching the mid to upper 90s. With partly cloudy skies in store and dewpoint temperatures in the low 70s, heat index values along the I-35 corridor and Coastal Plains could reach the 108 mark and higher for several hours. If this trend continues, then a Heat Advisory will be needed for Monday afternoon. && .LONG TERM... (Monday night through Saturday) Issued at 1250 AM CDT Sun Jun 21 2026 Dry and warm weather is in store for the work week into next weekend as upper level ridge dominates over South Central Texas. Daily high temperatures are forecast to reach the low to upper 90s and overnight lows in the low to mid 70s for the most part. && .AVIATION... (06Z TAFS) Issued at 1250 AM CDT Sun Jun 21 2026 Based on the nighttime microphysics imagery, we should see SCT V BKN MVFR CIGs in the next few hours. Some IFR CIGs were added for closer to daybreak, but we're not as confident on this, and there could also be some patchy ground fog instead given all the rains that have occurred this past week. A more steady upward trend to keep with diurnal norms would get us back to VFR skies by around 17Z or 18Z. Some higher wind gusts could also correlate with the best time of mixing in the midday hours. Late tonight, more MVFR CIGs are expected shortly after midnight. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 92 78 95 78 / 30 0 0 0 Austin Bergstrom Intl Airport 92 79 95 79 / 30 0 0 0 New Braunfels Muni Airport 91 77 93 77 / 30 0 0 0 Burnet Muni Airport 90 77 93 76 / 10 0 0 0 Del Rio Intl Airport 95 78 98 78 / 0 0 0 0 Georgetown Muni Airport 92 78 95 78 / 20 0 0 0 Hondo Muni Airport 89 76 92 76 / 10 10 0 0 San Marcos Muni Airport 92 77 95 77 / 30 0 0 0 LaGrange - Fayette Regional 91 79 94 79 / 30 0 0 0 San Antonio Intl Airport 90 78 93 78 / 20 10 0 0 Stinson Muni Airport 90 77 93 77 / 20 0 0 0 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...17 LONG TERM....17 AVIATION...18