An early-Thursday National Weather Service update keeps Comal County under a heat advisory from 2 p.m. Thursday through 7 p.m. Sunday, with temperatures up to 104 degrees and heat index values up to 112 expected across the advisory area.
Comal County residents face four consecutive afternoons under the advisory, and the National Weather Service says the heat and humidity may cause heat illnesses.
The alert was issued as an update at 1:29 a.m. Thursday. Its official area description expressly includes Comal County among 18 counties spanning the northern Hill Country, Interstate 35 corridor and Coastal Plains.
The advisory distinguishes the forecast air temperature from the heat index, which incorporates humidity. The maximums apply across the full advisory area; the alert does not assign a separate maximum to each listed county.
The alert carries an “expected” urgency, “moderate” severity and “likely” certainty in the National Weather Service record. Its message type is “Update,” while the alert headline says the advisory remains in effect through Sunday evening.
The next consequential record will be any National Weather Service update that changes the expected temperature or heat index, alters the counties covered, extends the advisory beyond Sunday evening or ends it earlier.