Flash Flood Watch Continued Until 7PM Sunday

posted by Jim Forsyth - 

FROM THE NATIONAL WEATHER SERVICE:

Flash Flood Watch extended through 7 PM today

Heavy rain threat today will be mainly west of Highway 281 (from San Antonio west to the Rio Grande)Threat for locally heavy rain and flash flooding will shift west through the day. Flash Flood Watch may be cancelled early.


Key Messaging Points:

Not everyone in the watch area will see rain today. Those that do may experience isolated flash flooding issues.Additional rainfall amounts of 1-2 inches with isolated event totals near 4 inches are possible through the day today. Highest flash flood risk west of Highway 281 and south of I-10 through Sunday evening.Heavier rain will occur within rain bands, but difficult to pinpoint where bands will develop.Flash flooding of low water crossings, underpasses, and urban areas possibleMinor to moderate flooding expected on Rio Grande, Nueces, Frio, and San Antonio Rivers.

Area of Concern:

Coastal Plains, San Antonio metro area, portions of the Hill Country, and Rio Grande Plains


Threats & Impacts: 

Rainfall:  Widespread 1-2" with locally higher amounts near 4" event totals in the Flash Flood Watch area. Several locations may experience minor flooding  with flood waters capable of causing small streams, creeks, canals, and  ditches to become swollen and overflow in a few places, but with little  to no property damage. Quick ponding of water occurs at underpasses,  low-lying spots, and poor drainage areas. Storm drains and retention  ponds become near-full and begin to overflow in a few places. Flood  waters may prompt brief road closures.

Overview:

A disturbance is located  near Eagle Pass early this morning.  Bands of showers and isolated  thunderstorms associated with this disturbance will continue to bring  heavy rain as they move into the region from the south and southeast  today. It is still difficult to pinpoint with any certainty where these  bands will set up, but the highest flash flood risk through this evening  appears to be south of I-10 and west of I-37.  Widespread 1-2" rainfall amounts with locally higher storm event totals near 4" will be possible in the Flash Flood Watch area. The  latest computer models indicate the potential for rain bands to develop  may persist through the day today, which is why the Flash Flood Watch  was extended. It  is important to keep in mind that not everyone in the watch area will  see rain today, but those that do may experience isolated flash flooding  from heavy rainfall. As  the disturbance moves farther west today into northern Mexico, the  heavy rain and flash flood threat will also shift west and exit the  region by this evening. Should the flash flood threat end sooner than  anticipated, the Flash Flood Watch may be cancelled early.

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