The National Weather Service (NWS) office in Austin/San Antonio has issued a Dense Fog Advisory for parts of South Central Texas, including Bexar County, in effect until 10:00 AM CST on Saturday, December 20, 2025. The advisory warns of visibility dropping to 1/4 mile or less in some locations, a threshold that can quickly make routine driving hazardous.
In its public hazard statement, the NWS cautioned drivers that “Expect reduced visibility of 1/4 mile or less over some locations,” urging motorists to slow down and allow extra stopping distance during the morning hours.
Meteorologists say the fog is consistent with the region’s broader late-December pattern: unseasonably warm, humid Gulf
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