Flash Flood Warning issued for several counties, including Northwest Bexar County

UPDATE 9 p.m. – A flash flood warning has been issued for Kendall County, Blanco County, Medina County and Northwestern Bexar County until 01:00 Tuesday. Doppler radar indicated between one and three inches of rain in the areas.

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SAN ANTONIO – It has been another very hot day across our region and humid with temperatures around 90 degrees! The cold front is now in our western counties and is gradually moving east with a favorable setup to produce storms in our region.

CLICK HERE to track the rain with our interactive radar…

There is enough instability in the atmosphere combined with wind shear to create a very isolated severe risk of strong gusts and hail. Much of our area is in a Level 1 out of 5 “marginal” severe storm outlook from the Storm Prediction Center given these conditions. Just to the north, a “light” level 2 out of 5 severe storm outlook is in place, clipping a small portion of our viewing area.

An isolated shower or storm is possible before 19.00, but the primary development window is from 7pm to midnight with activity then moving east overnight. Storms will develop along or on both sides of the I-35 corridor from north to south through the evening. This means that 20 – 25 miles on either side of I-35 storms are very possible. They will move slowly, and with high rainfall, localized flooding is certainly possible.

The first storms are likely in and around Bexar County with additional storms likely to develop along the front in our southern half of the area later this evening. These storms will then spread eastward overnight with any threat of strong to severe storms along the I-35 corridor at 1 a.m. with just a few remnant showers or sprinkles through dawn Tuesday.

Precipitation totals will generally range from 0.50″ to 1.50″+, but our internal computer model is pumping out 2″+ inches of rain in a few spots.