Area Forecast Discussion
Issued by NWS Austin/San Antonio, TX
Issued by NWS Austin/San Antonio, TX
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905 FXUS64 KEWX 060529 AFDEWX Area Forecast Discussion National Weather Service Austin/San Antonio TX 1229 AM CDT Thu Jun 6 2024 ...New AVIATION... .UPDATE... Issued at 802 PM CDT Wed Jun 5 2024 We just sent a short update to account for the storms trending down in the Edwards Plateau and northern Rio Grande Plains, and to end the Heat Advisory and Excessive Heat Warning for the evening. && .SHORT TERM... (Tonight through Thursday night) Issued at 257 PM CDT Wed Jun 5 2024 The main issue will be this evening, as we watch for potential development/re-development along the Sierra Madre, the edge of the old outflow boundary, and other locations where prior outflows can potentially hook up with a weak...though north-south diving short wave...which scoots through south-central and south Texas on the backside of the general trough across the Lower Mississippi Valley. This is a difficult call, as model consensus is bearish...including the hourly updated convective-allowing models (CAMs). Still...any energy running into the oppressive air mass has the potential to create something...and this matches well with the Storm Prediction Center`s marginal (level 1 of 5) risk. So...have expanded the coverage of slight chances to include locations south and west of the Austin-San Antonio corridor (which should stay just stable enough). All the activity should be over between 10 and 1 AM as the wave moves into the Lower Rio Grande Valley and beyond. Otherwise...will hold onto the current single county (Frio) Heat Warning and Heat Advisory for part of the Edwards Plateau and Rio Grande Plains/Big Bend region as temperatures are generally matching up nicely. Frio may fall short (advisory vs. warning) since the earlier outflow pushed dewpoints down a hair...but not enough confidence to remove at this point. Sunshine and heat returns everywhere Thursday...though the potential for Heat Advisory is held to portions of the Rio Grande Plains/Big Bend region based on slightly lower temperatures in the low levels. Will defer to later shifts for hoisting another advisory. A mostly clear, mainly calm, but plenty warm and humid night follows Thursday night as east side of expansing 500 mb ridge noses in. && .LONG TERM... (Friday through Wednesday) Issued at 257 PM CDT Wed Jun 5 2024 The aforementioned 500 mb ridge builds across most of Texas Friday and Saturday, locking in more heat and modest humidity. Dewpoints may be a touch lower with some drier air mix-down, so situation may fall just short of a Heat Advisory (108+ east and 110+ near the Rio Grande). Plenty of sunshine and light winds will make it feel pretty hot by early June standards. See Climate section for records...which should hold but not by much. By Sunday, the ridge begins shifting southward as a fairly deep (for early June) 500 mb trough develops across thIS CANCELLED...e eastern U.S. Northerly flow on the backside of this trough...along with southwest extent of short wave energy into east Texas...may help form up a band of moisture along/ahead of a wind shift (early summer "front"). After another hot and dry Sunday, this moisture should be sufficient to provide at least scattered thunderstorms across the region late Sunday night through Monday night...perhaps continuing into Tuesday before potentially pushing south of the area Tuesday night/Wednesday. Uncertainty is high as to how far south the wind shift makes it...with the deterministic ECMWF taking it through the entire area and the GFS washing it out closer to Austin. Regardless...the combination of increased cloud cover and/or a wind shift to the north will bring high temperatures closer to seasonal averages (90 to lower 90s) for Monday through Wednesday and eliminate the need for additional Heat hazards. && .AVIATION... (06Z TAFS) Issued at 1229 AM CDT Thu Jun 6 2024 The outflow boundary that surged across most of our area on Wednesday disrupted the lower level flow. At the I-35 sites, MVFR CIGs have been removed, although FEW MVFR clouds are still possible overnight into mid morning with VFR prevailing through Thursday night. Light winds overnight become easterly at 5 to 10 KTs on Thursday, then light again Thursday night. Pattern remains at KDRT with MVFR CIGs in the morning, otherwise VFR with occasionally breezy southeasterly winds. && .CLIMATE... Issued at 253 AM CDT Wed Jun 5 2024 THU FRI SAT 06/06 06/07 06/08 ------------------------------------------------ AUS 103/2011 100/2022 99/2022 ATT 103/2022* 103/2022 102/1925 SAT 104/2022 104/2022 101/2022 DRT 110/2022 108/1974 107/2020 * TIED RECORD WITH MOST RECENT OCCURRENCE SHOWN && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 74 98 76 97 / 0 0 0 0 Austin Bergstrom Intl Airport 72 98 74 97 / 0 0 0 0 New Braunfels Muni Airport 73 101 74 99 / 0 0 0 0 Burnet Muni Airport 72 96 74 96 / 0 0 0 0 Del Rio Intl Airport 82 106 79 104 / 0 0 0 0 Georgetown Muni Airport 71 96 75 96 / 0 0 0 0 Hondo Muni Airport 74 100 75 99 / 0 0 0 0 San Marcos Muni Airport 72 98 74 98 / 0 0 0 0 La Grange - Fayette Regional 73 96 75 96 / 0 0 0 0 San Antonio Intl Airport 75 99 76 98 / 0 0 0 0 Stinson Muni Airport 75 100 76 100 / 0 0 0 0 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && $$ Short-Term...04 Long-Term...Brady Aviation...04