Marine Weather and Tide Forecast for Terrell Hills, TX

LONG TERM
(Wednesday night through Monday)
Issued at 115 AM CDT Tue May 13 2025

Key Messages:

- Potentially historic early season heatwave continues into the weekend with multiple records in jeopardy of being broken.

- Moderate to Major risk of heat-related impacts through the upcoming weekend.

A Heat Advisory is in effect for all of South Central Texas until 9PM Wednesday. The heat wave continues all the way through the work week and into the upcoming weekend. Air temperatures are forecast to come down a few degrees each day however temperatures will still be 15 degrees above normal. Even though temps decrease slightly the increased moisture coming in via southerly/southeasterly flow across the local area will keep feels like temps as high as our previous actual air temps. All that to say, is it will feel hot and dry initially before eventually becoming muggy and possibly even downright oppressive across the area. Heat index values of 100-110 are expected across the entire area and throughout the long term. No matter how you slice it, it is going to be a very hot work week across all of South Central Texas that likely extends into the weekend and possibly even early next week. Please make sure you and your loved ones have a way to stay cool during this early season heatwave. Additional heat safety information and resources can be found at the following websites: www.heat.gov and www.weather.gov/safety/heat

Regarding precip, we do have chances for showers and storms mainly late Saturday, Sunday and again on Monday. However these will be highly conditional based on previous outflow boundaries from each evenings previous storms. Models are showing more precip being possible but this is still a ways out so be sure to keep monitoring future forecasts as details become clearer.

AVIATION
(18Z TAFS)
Issued at 104 PM CDT Tue May 13 2025

VFR conditions are expected at area TAF sites through the current forecast period. Gusty south winds are expected this afternoon for most of the I-35 corridor, with winds briefly becoming westerly at DRT. Low-level moisture may lead to some patchy fog and low cloud development along I-35 early Wednesday morning. However, suspect winds will stay elevated enough to keep coverage low and will not mention either fog or low clouds in the forecast at this time.

FIRE WEATHER
Issued at 252 PM CDT Mon May 12 2025

Tuesday we could see RH values lower than 15% across the Rio Grande and RH values between 15-20% across the rest of the area. Temps over 100 degrees and add in breezy southwesterly winds could lead to elevated to near critical fire weather conditions. A drying and warming trend continues on Wednesday, resulting in lower RH values closer to 10 percent over the Rio Grande Plains and southern Edwards Plateau with temperatures above 100F throughout South Central Texas.
Southerly flow is forecast each afternoon along and east of I-35 with 10 to 15 mph winds. Areas west of I-35 may see a mix of 5 to 10 mph westerly to southerly winds due to daily advances of the dry line.
Temperatures tick down a few degrees on Thursday and moisture increases slightly, resulting in an increase in daily minimum RH values for a good portion of the local area. However, afternoon RH values near 15 to 20 percent may continue along the Rio Grande and southern Edwards Plateau through the weekend. The dry potentially record-setting warmth throughout the week could lead to more active fire weather conditions going forward as fuels dry out from last weeks stormy pattern.

CLIMATE
Issued at 252 PM CDT Sun May 11 2025

RECORD MAX TEMPERATURES TUESDAY THROUGH SATURDAY (* TIED RECORD WITH MOST RECENT OCCURRENCE SHOWN)

TUE WED THU FRI SAT 05/13 05/14 05/15 05/16 05/17 ------------------------------------------------------ AUS 94/1967* 96/2003 96/2003 97/2018* 97/2018 ATT 98/1925 97/2022 98/1925 99/2022* 99/2022 SAT 98/2009* 97/2022* 98/2022 97/2022* 100/2022 DRT 104/1995 103/2003 102/2022 107/2013 105/2013

RECORD MAX TEMPERATURES FOR MAY ------------------------------- AUS 102 ... set on 05/07/1998 ATT 104 ... set on 05/24/1925 SAT 104 ... set on 05/31/2004 DRT 112 ... set on 05/26/2024

PRELIMINARY POINT TEMPS/POPS
Austin Camp Mabry 103 74 105 72 / 0 0 0 0 Austin Bergstrom Intl Airport 103 72 105 71 / 0 0 0 0 New Braunfels Muni Airport 103 72 105 71 / 0 0 0 0 Burnet Muni Airport 102 74 105 74 / 0 0 0 0 Del Rio Intl Airport 108 76 110 80 / 0 0 0 0 Georgetown Muni Airport 103 74 105 73 / 0 0 0 0 Hondo Muni Airport 105 71 107 73 / 0 0 0 0 San Marcos Muni Airport 103 71 106 70 / 0 0 0 0 La Grange - Fayette Regional 99 72 100 71 / 0 0 0 0 San Antonio Intl Airport 104 74 106 74 / 0 0 0 0 Stinson Muni Airport 105 73 106 72 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES
Heat Advisory until 1 PM CDT Wednesday for Atascosa-Bandera-Bastrop- Bexar-Blanco-Burnet-Caldwell-Comal-Dimmit-Edwards-Frio-Gillespie- Gonzales-Guadalupe-Hays-Karnes-Kendall-Kerr-Kinney-Llano-Maverick- Medina-Real-Travis-Uvalde-Val Verde-Williamson-Wilson-Zavala.

Extreme Heat Warning from 1 PM to 9 PM CDT Wednesday for Atascosa- Bandera-Bastrop-Bexar-Blanco-Burnet-Caldwell-Comal-Dimmit-Edwards- Frio-Gillespie-Gonzales-Guadalupe-Hays-Karnes-Kendall-Kerr-Kinney- Llano-Maverick-Medina-Real-Travis-Uvalde-Val Verde-Williamson- Wilson-Zavala.

Heat Advisory from 1 PM to 9 PM CDT Wednesday for De Witt-Fayette- Lavaca-Lee.