Tropical moisture to bring a chance of rain to San Antonio late this week

Scattered showers and storms are most likely late Friday into Saturday

Tropical Disturbance 1 Update; Valid Wednesday, July 22nd (KSAT 12)

SAN ANTONIO – July has been bone-dry for the Alamo City, only officially clocking in a trace amount of rainfall at San Antonio International Airport. Thankfully, a tropical wave will swing moisture from the Gulf of Mexico to Texas by the week’s end.

Upcoming Rain Chances Valid Wednesday, July 22nd (KSAT 12)

Coastal Showers and Storms

As is typical this time of year, isolated sea breeze showers and storms will be possible Wednesday. The chance for rain is 20-30% and best chances will be east of I-35. Any lucky places that receive rain should get quick downpours, potentially a few flashes of lightning, and gusty winds. No severe weather is expected.

Potential Tropical Development in the Gulf

As of Wednesday afternoon, the National Hurricane Center (NHC) is monitoring a tropical wave over the Central Gulf of Mexico for potential tropical development. Currently, the NHC has given the wave a high (80%) probability of formation through the next 5 days. Regardless of formation, this system will swing a decent amount of tropical moisture into Texas. This will increase rain chances for San Antonio by late Friday (7/24) and through the weekend (7/25 and 7/26). On those days, scattered showers and a few storms will be possible, bringing the best chance for rain in the Alamo City in nearly a month.

Tropical Disturbance 1 Update; Valid Wednesday, July 22nd (KSAT 12)

Tropical Storm Gonzalo

The seventh named storm of the 2020 Atlantic hurricane season, Gonzalo, formed early on Wednesday. Gonzalo could become a hurricane by Thursday. After that, the storm is forecast to move west into the Caribbean by this weekend, in a weaker state. We’ll continue to monitor the situation, but this storm is not expected to impact the Texas Coast at the moment.

Tropical Storm Gonzalo Update Valid Wednesday, July 22nd (KSAT 12)

Evolving Forecast

You can keep up-to-date with Your Weather Authority as we continue to watch the tropics and this week’s forecast by downloading the KSAT Weather Authority app for Apple or Android and allow notifications for updates, including livestreams from KSAT meteorologists.

Our KSAT Hurricane Tracker app also allows you to monitor the tropics from your phone during the Atlantic Hurricane Season, which runs from June 1 to November 30.

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About the Authors:

Sarah Spivey is a San Antonio native who grew up watching KSAT. She has been a proud member of the KSAT Weather Authority Team since 2017. Sarah is a Clark High School and Texas A&M University graduate. She previously worked at KTEN News. When Sarah is not busy forecasting, she enjoys hanging out with her husband and cat, and playing music.

Justin Horne is a meteorologist and reporter for KSAT 12 News. When severe weather rolls through, Justin will hop in the KSAT 12 Storm Chaser to safely bring you the latest weather conditions from across South Texas. On top of delivering an accurate forecast, Justin often reports on one of his favorite topics: Texas history.