The latest updates by noon on Sunday, May 10:
Earlier, from the National Weather Service:
…Slight Risk for Severe Storms this afternoon and Tonight – Tornado Watch in Effect…
…Slight Risk for Severe Storms on Monday…
…Locally Heavy Rainfall Possible Tonight through Thursday…
Timing & Area of Concern:
- This Afternoon through Tonight: Slight risk for severe storms along and north of a Kerrville to New Braunfels to La Grange line (including Austin) and Marginal Risk south of this line (including San Antonio). Enhanced risk for severe storms along and north of a Burnet to Georgetown line. Locally Heavy Rainfall possible late afternoon and tonight along and north of a Kerrville to New Braunfels to La Grange line (including Austin).
- Monday through Tuesday: Slight risk for severe storms across all of South-Central Texas Monday and Monday night (Includes San Antonio & Austin). Locally heavy rainfall threat possible Monday night and Tuesday along and south of Interstate 10 (includes San Antonio)
- Wednesday through Thursday: Locally heavy rainfall threat possible across portions of South-Central Texas. (includes Austin and San Antonio)
Threats & Impacts:
- Hail up to golf ball sized and winds up to 60 mph
- Threat for hail larger than golf ball sized this afternoon and tonight along and north of a Kerrville to Georgetown line (see grey hatched area in attached graphic)
- Isolated tornadoes possible, especially this afternoon and tonight in Tornado Watch area (see attached graphic)
Rainfall & Flooding
- Today through Thursday: 3 to 6 inches across the eastern Hill Country and along and east of the I-35 corridor. 2 to 4 inches across the western Hill Country. 1 to 3 inches across the Rio Grande. Isolated higher amounts possible. (see attached graphic)
- Amounts are forecast over the course of 5 days.
- Given these these forecast rainfall amounts, along with current hydrologic conditions, localized moderate river flooding will be possible for tributaries and mainstem rivers in areas generally along and east of I-35 corridor. In addition, a flash flood threat of smaller creeks, streams, low water crossings, and other urban areas normally subject to flooding may also may also develop.
A moist and very unstable airmass will interact with an upper level disturbance this afternoon and tonight, leading to scattered to numerous showers and storms. The greatest threat this afternoon and tonight will be along and north of a Del Rio to New Braunfels to La Grange line, where severe storms will be possible, capable of producing large hail, damaging straight line winds and isolated tornadoes. Locally heavy rainfall may also occur.
A weak cold front will move into South-Central Texas on Monday, resulting in a continued risk for strong to severe storms along with locally heavy rainfall. The heavy rainfall threat may shift along and south of I-10 Monday night into Tuesday, depending on where the cold front ends up.
Long range models continue a good chance for rainfall Wednesday into Thursday, although details in exact rainfall amounts and severe potential are low at this time.
- Severe Potential this afternoon and Tonight this Weekend: Moderate to High
- Severe Potential Monday: Low to Moderate
- Flooding and Rainfall Amounts: Moderate
Additional Information Resources:
· NWS Austin / San Antonio Contact Numbers: 830-606-3617
· NWS Austin / San Antonio Webpage: http://www.weather.gov/sanantonio
· Online Flood Reporting: http://www.srh.noaa.gov/StormReport/SubmitReport.php?site=EWX
· Sign up to be Rainfall Observer: http://cocorahs.org/Application.aspx
· AHPS River Forecasts: http://water.weather.gov/ahps2/index.php?wfo=ewx
· Storm Prediction Center: http://www.spc.noaa.gov/
· Online Severe Weather Reporting: http://www.srh.noaa.gov/StormReport/SubmitReport.php?site=EWX
Request for Information:
Please relay flooding reports and/or photo’s of flooding to email@example.com