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Area Forecast Discussion
Issued by NWS Austin/San Antonio, TX
Issued by NWS Austin/San Antonio, TX
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634 FXUS64 KEWX 222348 AFDEWX Area Forecast Discussion National Weather Service Austin/San Antonio TX 648 PM CDT Mon Jul 22 2024 ...New AVIATION... .SHORT TERM... (Tonight through Tuesday night) Issued at 155 PM CDT Mon Jul 22 2024 Key Messages * There is a risk for locally heavy rainfall this afternoon and into tonight. * Isolated pockets of a quick 1-4 inches of rainfall could lead to flooding. * Be alert for flooding through the afternoon and tonight and never drive through a flood roadway. Numerous showers and scattered storms are ongoing across the southern Edwards Plateau, Hill Country, and northern I-35 corridor as well as scattered showers and isolated storms across the Coastal Plains. The actual weak cold front is still just north of the area, becoming harder to identify, and much of the convection across the northern CWA is being driven by surface outflow and upper level forcing. New showers and storms should develop into the I-35 corridor and Rio Grande through the remainder of the afternoon and well into the evening hours, driven by outflow from the north working southeast into the instability axis and potentially the sea- breeze converging inland. We have seen some pockets of 1-3 inches of rainfall occur this morning. This will continue to be the case as new activity develops into the Rio Grande, I-35 corridor, and Coastal Plains. A few HREF members have been indicating a stripe of heavier rainfall possible late afternoon and evening stretching from just east of Austin, southwest through San Antonio, and to near Eagle Pass. This may be in the region where the outflow to the north and sea-breeze moving inland merge. The rain so far has been welcome in drought stricken areas of the western Hill Country and southern Edwards Plateau, with only a few Flood Advisories. However, we will have to watch rainfall rates and storms mergers closely late this afternoon and into the evening for areas to the east that aren`t in drought conditions in addition to the urban I-35 corridor, which will be more susceptible to a quicker flood response with any heavy rainfall. Beyond this evening forecast confidence in placement of showers and storms becomes low. There is a signal in the HREF and some global ensembles for the forcing for showers and storms overnight and into Tuesday morning to focus across the Rio Grande and back into the southern Edwards Plateau, then Tuesday afternoon and night near the I-35 corridor and into the Coastal Plains. Again this is lower confidence, and may ultimately be tied to mesoscale influences and weak upper level forcing. A threat for isolated pockets of locally heavy rainfall that could lead to flooding continues during this time. With the cloud cover and rain, much cooler temperatures are occurring today across northern areas, with highs only 80s. High temperatures Tuesday for most areas are forecast to be in the 80s. && .LONG TERM... (Wednesday through Monday) Issued at 155 PM CDT Mon Jul 22 2024 The wet pattern continues into the extended/long term forecast. Each day from Wednesday into the upcoming weekend, there are chances for showers and storms. An upper level short wave axis is forecast to linger across South Central Texas through Thursday before an upper level cutoff low develops over the local area extending into the northeast part of Texas. The shower and thunderstorm activity depends where the short wave axis sits each day with models favoring the I-35 corridor and the coastal plains. Can`t rule out showers and storms over the Hill Country and southern Edwards Plateau through the period, however, the setup is for the heaviest rains to occur along and east of the I-35 corridor and coastal plains. Each day in the extended could end up with isolated spots with several inches of rainfall as forecast precipitable water values are above 2 inches. So, the forecast message is to stay weather aware as a wet pattern is in place where some locations may experience minor flooding especially across roadways, low lying and poor drainage areas. Beside the welcome rain expected during the extended forecast period, cooler temperatures are in store with highs in the 80s over most places and low to mid 90s along the Rio Grande. && .AVIATION... (00Z TAFS) Issued at 641 PM CDT Mon Jul 22 2024 There will be chances for showers and thunderstorms across the area during the upcoming TAF period. Currently there are storms within about 10nm of the Austin and San Antonio terminals. These will linger for another couple of hours. After that timing will be difficult, but any convection will bring erratic gusty winds and MVFR ceilings and visibility. Outside of storms conditions will be VFR at all airports. MVFR ceilings will develop in the Austin and San Antonio areas overnight, but DRT will remain VFR. Chances for convection will continue during the day Tuesday. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 73 89 73 91 / 60 50 20 50 Austin Bergstrom Intl Airport 73 87 72 88 / 70 60 30 50 New Braunfels Muni Airport 74 88 73 89 / 80 70 30 60 Burnet Muni Airport 71 87 71 89 / 40 40 20 30 Del Rio Intl Airport 74 89 76 96 / 80 50 30 40 Georgetown Muni Airport 71 87 71 88 / 60 40 20 40 Hondo Muni Airport 73 86 72 90 / 80 40 20 50 San Marcos Muni Airport 72 87 72 88 / 80 60 30 50 La Grange - Fayette Regional 73 87 72 84 / 60 80 30 70 San Antonio Intl Airport 74 87 74 89 / 80 60 30 60 Stinson Muni Airport 75 89 75 90 / 80 60 30 60 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && $$ Short-Term...76 Long-Term...17 Aviation...05