WATCH: Video of heavy hail near Boerne overnight

A severe thunderstorm warning was in effect for portions of Kendall County

SAN ANTONIO – WATCH: Here's a look at some of the hail that moved through near Boerne on Tuesday morning. (Courtesy: Shon Hackney)

A severe thunderstorm warning was in effect for southern and central Kendall county until 5 a.m. A flash flood warning is in effect for southwest Kendall county until 7:15 a.m.

Quarter sized hail and estimates of 2"-4" of rain have already fallen, KSAT 12 meteorologist Mike Osterhage said.

Download the KSAT Weather app for iPhone and Android.

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(Original Story)

The National Weather Service has issued a flash flood watch from 4 p.m. Monday through Tuesday morning for Bexar County and the following counties:

Atascosa, Bandera, Blanco, Caldwell, Comal, Fayette, Frio, Gillespie, Gonzales, Guadalupe, Hays, Kendall, Kerr, Medina, Real, Uvalde, Wilson and Zavala.

REMEMBER: Turn around, don't drown!

KSAT Meteorologist Adam Caskey said a flash flood watch means conditions are favorable for flash flooding, but it's not happening at the moment. A warning means it's actually occurring. 

Click here to see live Doppler Radar.

UPDATES: Scroll through the KSAT 12 Weather & National Weather Service Twitter feeds for the latest up-to-the-minute severe weather updates.

Power Outages/ Road Closures

Keep up with the latest power outages in the San Antonio area on the CPS Energy website. Click here to view a current power outage map. Presently there are 129 outages affecting 2,607 customers.

Click the links below for current road closures.

Below is a map of notable low water crossings in San Antonio.

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About the Authors:

Meteorologist Mike Osterhage handles the weather forecasting duties for the Emmy-award winning "Good Morning San Antonio" and as co-host of “SA Live” in the afternoon. Mike received his meteorology degree from Mississippi State and a Bachelor of Arts in Journalism from Oakland University in Rochester, Mich.

Ben Spicer is a digital journalist who works the early morning shift for KSAT.