Light rain is likely to pick up in intensity by Sunday afternoon/evening. After midnight, heavy rainfall is possible for areas, mainly along and east of the I-35 corridor. Rainfall will be heaviest on Monday morning. This is why a FLASH FLOOD WATCH has been issued for Travis, Williamson, Hays, Blanco, Burnet, Caldwell, Lee, Bastrop and Fayette counties from 7 PM Sunday until 7 PM Monday.
This is what our friends at the National Weather Service have to say on the issue:
…Widespread Rainfall Today through Monday…
…Locally Heavy Rainfall Possible Tonight and Monday – Flash Flood Watch Posted…
Area of Concern:
Along and east of a Burnet to Boerne to Pearsall line. This includes the Austin and San Antonio metro areas.
Threats & Impacts:
Rainfall: Widespread amounts of 2-4 inches in the area of concern. Isolated pockets up to 6 inches along and east of Interstate 35. Much lesser amounts of 1/2 to 1 1/2 inches will occur farther northwest…along the Rio Grande and across the northern Hill Country.
Impacts: Rapid runoff from these heavy rains could result in flash flooding of creeks and streams, low water crossings, and urban areas normally prone to flooding, as well as a pose a threat to life and property. Those locations in the Flash Flood Watch area (outlined in the green box on the attached map) will have the greatest risk of seeing these impacts.
Timing and Overview:
An upper level storm system will interact with abundant moisture from both the Gulf of Mexico and Pacific Ocean today through early Monday evening. An impressive tap of moisture was seen on satellite early Sunday morning streaming out of the Pacific, across Mexico and into South-Central Texas. Several rounds of showers and isolated thunderstorms are possible today through early Monday evening. The heaviest rainfall is likely to come late Sunday night through Monday afternoon. The most favorable areas for locally heavy rainfall and potential flash flooding will be along and east of Interstate 35. Drier air will move into the area from west to east Monday night.
- Moderate to High on Rainfall Amounts
- Moderate on Flash Flooding
Additional Information Resources:
Here’s a look at one of highest-resolution models, which depicts Austin getting 3.6″ of new rainfall by 11 PM Monday night:
Join the First Warning Weather Team Sunday night and again Monday morning to hear about any shifts in the heavy rainfall line!