Updated Look at the Rainy Forecast for the San Antonio Area

…Multiple rounds of strong thunderstorms and heavy rainfall are expected tonight through Wednesday…

Area of Concern:

Tuesday Morning:  Northern Hill Country, Edwards Plateau, and Rio Grande Plains (near and north of a Eagle Pass to Medina to Burnet)

Tuesday Night/Wednesday:  North of a line from Rocksprings to San Antonio to Hallettsville

Threats & Impacts: 

Tuesday Morning:

Strong to Severe Thunderstorms:  Isolated storms may produce up to 1 inch hail and wind gusts up to 60 mph.

Rainfall: Up to 1 inch with 2 inches possible in the strongest storm. Isolated minor flooding possible.

Tuesday Night/Wednesday:

Rainfall:  Widespread 1 to 3 inch amounts, with isolated  totals up to 5 inches possible north of I-10.  This will likely saturate  soils and produce localized flash flooding in normally flood prone  areas. 

Additional Strong Storm Threats: Isolated stronger storms may produce up to 1 inch sized hail and wind gusts up to 60 mph.  

Impacts: Tonight the main threat will be from hail and strong wind gusts. Strong winds  could cause minor property damage. Storms should be moving fast enough that flooding will be less likely, but strong storms could drop 1 to 2  inches of rain and produce minor flooding. Tuesday Night into Wednesday 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 will occur at underpasses, low-lying spots, and poor drainage areas. Storm drains and retention ponds will become near-full and begin to overflow in a few places. Flood waters may prompt brief road closures.

Timing and Overview:

An unstable pattern will favor repeated rounds of  showers and thunderstorms, beginning as early as late this evening and  continuing into Wednesday afternoon. Threats for strong to severe storms  and heavy rain tonight should be mainly north and west of a line from Burnet to Medina to Eagle Pass tonight before shifting east from late  Tuesday through Wednesday afternoon when the main threat area will be  north of a line from Rocksprings to San Antonio to Hallettsville. A cold  front is expected during the day Wednesday with additional showers and  thunderstorms expected behind the front for several hours.

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