Area Forecast Discussion
Issued by NWS Austin/San Antonio, TX
Issued by NWS Austin/San Antonio, TX
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522 FXUS64 KEWX 221925 AFDEWX Area Forecast Discussion National Weather Service Austin/San Antonio TX 225 PM CDT Wed May 22 2024 ...New SHORT TERM, LONG TERM... .SHORT TERM... (Tonight through Thursday night) Issued at 224 PM CDT Wed May 22 2024 * Level 2 to 3 out of 5 risk for isolated to scattered severe storms this evening across portions of the northern Hill Country and central Texas. * Dangerous heat indices this afternoon and Thursday afternoon, especially across the Rio Grande Plains - those spending extended time outdoors and not acclimated to the early season heat could be susceptible to heat related illness if not taking proper heat precautions. Early this afternoon has seen the morning stratus slowly erode along with the thickest of the haze (combination of the high humidity and smoke coming from the agricultural burning in Mexico and Central America). A pocket of mid-level moisture also was able to develop a few morning showers earlier as well from the I-35 corridor down into the coastal plains. It`s no surprise but highs will commonly reach the low to mid 90s again this afternoon while locations towards the Rio Grande eclipse 100 degrees. Heat indices across the Rio Grande plains climb into the 108 to 113 range and thus the Heat Advisory across those counties remains on target. Elsewhere, peak heat indices into the 100 to 108 degree range will be common. That`s the heat headlines today but now let`s talk about the convective chances from late this afternoon through tonight down below. Strong to severe thunderstorms have already begun to fire along a cold front to the north across Central Texas from near Sterling City to Cicso. While activity along and ahead of the cold front will be our primary concern later this evening through tonight over our northern counties, it is expected to take some time for this activity to reach our CWA. Portions of the Rio Grande may actually be the first location to see a storm enter our region as an isolated cell or two fires off the higher terrain of Mexico to our west and the dryline. Now back to our main round, the CAMs continue to indicate a cluster of isolated to scattered strong to severe storms advancing east-southeastward into Llano and Burnet Counties near the 7 to 10 PM time frame, and a potential as far south as the Austin metro area beyond 9 to 10 PM. The primary severe hazards will include large to very large hail and damaging wind gusts. While an isolated tornado threat is possible, the greatest risk for a tornado should generally focus north of our CWA. Towards the south and southwest, convective inhibition will be on the increase from the late evening through tonight. This will lead to a weakening trend of the storms at that time, eventually dissipating. We continue to not expect for the storms to reach the San Antonio metro area or south of I-10 at this time. Overnight tonight through Thursday morning will once again trend of very warm and humid conditions with the lows in the 70s to near 80 degrees. Low stratus along with thicker haze will return as well. Several of the CAMs show possible redevelopment of rain and storms across portions of the San Angelo CWA through early Thursday morning. There is a low possibility for this activity to clip our northern most Hill Country counties later Thursday morning into early afternoon. Inserted a small region of 15 to 20 PoPs across those counties between 15 UTC and 21 UTC. Otherwise, the remainder of Thursday should stay dry with more heat as highlighted below. Thursday afternoon is expected to trend as hot or perhaps slightly hotter than today with skies becoming sunny to mostly sunny area wide by late afternoon. 90s will be common for most locations and areas along the Rio Grande return up into the 100 to 105 degree range. Heat indices nearly match today`s numbers with 100 to 108 degrees ranging for majority of the region while the Rio Grande Plains has the peak heat indices top out in the 108 to 113 range. Another Heat Advisory is likely for the same counties as today but will pass issuance to the overnight shift given the ongoing heat hazard and today`s severe weather potential. Low stratus and some haze will likely make a return during the overnight into early Friday with lows again mainly in the 70s to near 80 degrees. && .LONG TERM... (Friday through Wednesday) Issued at 224 PM CDT Wed May 22 2024 Upper level ridging will remain in place over Mexico through the long term period, which will generally lead to a warming trend through the Memorial Day Weekend with Heat Advisories and/or Warnings likely. A small vort max, primarily indicated by the GFS, may move across central Texas late Friday afternoon and into the evening which could spark an isolated storm or two across our northeastern counties. Otherwise, dry conditions are expected to prevail through the weekend. At this time, Sunday appears to be the warmest day for south-central Texas, though each day through the weekend will have dangerous heat for those spending prolonged periods outdoors and not taking the proper precautions. Daily record MaxT`s and record warm MinT`s will also likely be challenged or set each day across the area. Del Rio specifically may set a new all time MaxT record for the month of May as well, which was tied at 109F earlier this month. A welcomed drop in temperatures may occur Tuesday into Wednesday of next week as a cold front works into the area from the north. Temperatures will still likely be above average, yet noticeably different from the previous days. This front may also bring some isolated storm potential as well late Monday through Wednesday as the boundary lingers near the area. && .AVIATION... (18Z TAFS) Issued at 1226 PM CDT Wed May 22 2024 Lingering MVFR to IFR ceilings will improve to VFR by 20 UTC at all of the South-Central Texas area TAF sites. KDRT could see isolated convection develop nearby from late this afternoon through this evening. KAUS has the greatest chances to be impacted by convection this evening sometime around 02 UTC to 06 UTC. Added TEMPO -TSRA for that period. The San Antonio terminals (KSAT and KSSF) will remain dry throughout the forecast period. Expect prevailing MVFR flight conditions to return across the I-35 sites (KAUS, KSAT and KSSF) overnight into Thursday morning. MVFR conditions may possibly briefly reach KDRT after sunrise. Haze featuring slight visibility restrictions will be possible as well. Conditions improve to VFR at all sites into Thursday afternoon. A moderate south-southeasterly flow prevails with occasionally gusty winds this afternoon and Thursday morning into Thursday afternoon. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 94 75 94 76 / 20 30 10 0 Austin Bergstrom Intl Airport 93 75 93 76 / 20 30 10 0 New Braunfels Muni Airport 96 76 96 76 / 20 20 0 0 Burnet Muni Airport 90 73 91 74 / 30 30 20 0 Del Rio Intl Airport 103 81 105 80 / 20 20 0 0 Georgetown Muni Airport 92 74 91 75 / 20 30 20 0 Hondo Muni Airport 98 76 99 74 / 10 10 0 0 San Marcos Muni Airport 95 75 95 75 / 20 20 10 0 La Grange - Fayette Regional 92 76 92 77 / 20 20 0 0 San Antonio Intl Airport 95 76 96 76 / 20 10 0 0 Stinson Muni Airport 97 77 98 77 / 10 10 0 0 && .EWX WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 7 PM CDT this evening for Atascosa-Dimmit-Frio- Maverick-Zavala. && $$ Short-Term...Brady Long-Term...Gale Aviation...Brady