UPDATE 9:00 p.m. – A flash flood warning has been issued for Kendall County, Blanco County, Medina County and Northwestern Bexar County until 1 a.m. Tuesday. Doppler radar showed rainfall amounts of between one and three inches in the areas.

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SAN ANTONIO – It was another very hot day in our area and humid with temperatures in the high 90s! The cold front is now in our western counties and is gradually moving eastward, with conditions favorable for storm formation across our region.

CLICK HERE to track the rain with our interactive radar…

There is enough instability in the atmosphere, coupled with wind shear, to create a very isolated serious risk of strong gusts and hail. These conditions place much of our area in the Storm Prediction Center’s Level 1 of 5 “minor” severe storm category. There is a Level 2 out of 5 “light” severe storm immediately to the north, reducing a small portion of our visibility area.

An isolated shower or storm is possible before 7pm, but the main development window is from 7pm to midnight, with activity then moving eastwards overnight. Storms will develop north to south along or on either side of the I-35 corridor throughout the evening. That means storms within 20 to 25 miles on both sides of I-35 are quite possible. They will move slowly and localized flooding is quite possible if there is high rainfall.

The first storms are likely in and around Bexar County, with additional storms likely to develop later this evening along the front in our southern half of the area. These storms will then move eastward overnight, with the threat of strong to severe storms along the I-35 corridor beginning at 1 a.m., with only a few remaining showers or showers through daybreak Tuesday.

Rainfall totals are generally between 0.50 and 1.50 inches or more, but our in-house computer model is pumping out more than 2 inches of rain in some locations.