Area Forecast Discussion
Issued by NWS Austin/San Antonio, TX
Issued by NWS Austin/San Antonio, TX
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913 FXUS64 KEWX 170320 AFDEWX Area Forecast Discussion National Weather Service Austin/San Antonio TX 1020 PM CDT Sun Jun 16 2024 ...New AVIATION... .SHORT TERM... (Tonight through Monday night) Issued at 133 PM CDT Sun Jun 16 2024 Nocturnal stratus has scattered out across South-Central Texas this afternoon and mostly clear to partly cloudy skies continue at the present time. We saw a few streamer showers in the Coastal Plains this morning and that activity has mostly dwindled as well. South/Southeast winds will be breezy at times today into the evening hours. Otherwise, highs later today will top out in the middle 90s to near 103 degrees out west. Another round of nocturnal stratus is expected overnight tonight into tomorrow morning. This will allow for low temperatures to remain on the warmer side, bottoming out in the middle to upper 70s for most locations. Moisture levels tomorrow morning into the afternoon will be higher and should see a slightly higher coverage of the streamer showers for areas mainly east of the I35 corridor tomorrow morning into the afternoon. Will show some 20-50 PoPs out there. Most of the activity will likely be showers but can`t rule out a thunderstorm as well. Highs tomorrow will be in the lower 90s in the east and up into the 100-103 degree range out west. Most if not all the rain activity will diminish by sunset leaving a mostly dry night tomorrow night with lows back in the middle to upper 70s. && .LONG TERM... (Tuesday through Sunday) Issued at 133 PM CDT Sun Jun 16 2024 Focus for the long term remains on tropical influences and the low level of confidence in the impacts to the local area. The latest information from NHC shows a 30% chance of formation over the next 48 hours, and a 70% chance of formation over the next 7 days. Initial surge of moisture and periphery shortwaves of the primary disturbance will bring shower and thunderstorm chances into the service area generally along and south of I-35 on Tuesday. Chances spread area wide Wednesday through Friday as the disturbance moves further inland followed by upper level troughing. Variations in system evolution and track persist in the forecast which will have significant impacts on possible rainfall amounts. What does this mean for rainfall? Long story short, still to early for specifics given the wide range of possibilities. The operational GFS has been a proponent of the higher end of storm totals while the ECMWF has shown to be more on the lower end of totals. 12z GFS did come down a fair bit from the 06z run concerning storm totals but remains higher than the ECMWF. 12z GEFS probability of greater than 2 inches shows a greater than 55% chance for storm total amounts to be greater than 2" for the majority of the area with the Coastal Plains having a 70% or greater chance. Will also mention that areas east of HWY 281 were shown to have around a 3 in 10 chance of seeing storm total amounts of greater than 5 inches. So there is a decent chance we get some much needed rain to areas that severely need it, and it`s not off the table that this rainfall could result in flooding and flash flooding for areas that have the chances for the higher totals. Not surprising, given this, that WPC has much of the area in a Slight Risk (2 of 4) for excessive rainfall on days 4 and 5. River wise, the western rivers desperately need the rainfall. 18z HEFS guidance shows a mixture of Action stage to Minor Flood stage primarily along and south of I-35. Will mention that some locations also show a less than 10% chance of exceedance for Moderate Flood stage primarily for the Coastal Plain counties which could be in play if we see some of the higher end rainfall totals of the deterministic models. Over next weekend, we could see some additional rainfall chances across the Coastal Plains due to weak waves moving onshore from the Gulf. This additional rainfall could prolong any ongoing river flooding. && .AVIATION... (06Z TAFS) Issued at 1016 PM CDT Sun Jun 16 2024 The sea breeze has made it into KAUS/KSAT/KSSF, with gusty southeasterly winds this evening. These winds should slowly drop off to light to moderate by 08Z. KAUS/KSAT/KSSF will see MVFR CIGS by 08Z and lasting until 16Z Monday. KDRT CIGS will be higher and only from 10-14Z. There may be -DZ or -SHRA around KAUS/KSAT/KSSF around daybreak and possibly again by early evening Monday, but low enough chances to leave out of the TAFs at this time. Expect a repeat Monday evening with gusty southeasterly winds as the sea breeze makes it to the I-35 corridor around sunset. Otherwise, expect MVFR cigs at all sites by 03-04Z. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 77 94 77 92 / 0 10 0 20 Austin Bergstrom Intl Airport 76 94 76 91 / 0 20 0 20 New Braunfels Muni Airport 76 95 77 92 / 0 20 0 20 Burnet Muni Airport 75 92 75 89 / 0 10 0 10 Del Rio Intl Airport 80 103 80 102 / 0 0 0 0 Georgetown Muni Airport 75 93 75 89 / 0 10 0 20 Hondo Muni Airport 76 97 77 94 / 0 0 0 10 San Marcos Muni Airport 75 93 75 91 / 0 20 0 20 La Grange - Fayette Regional 76 91 76 88 / 0 40 0 30 San Antonio Intl Airport 78 96 77 93 / 0 10 0 20 Stinson Muni Airport 78 97 78 94 / 0 10 0 20 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && $$ Short-Term...Zeitler Long-Term...18 Aviation...Zeitler