The National Weather Service issued a flash freeze warning for the Patapsco River including Baltimore Harbor, Tidal Potomac from Key Bridge to Indian Head MD, District of Columbia, and counties Anne Arundel, Calvert, Carroll, Cecil, Central and Eastern Allegany in Maryland until 10:00 PM EST on February 6, 2026. The warning was posted at 10:10 PM EST, within the reporting window from 9:46 PM EST on February 6 to 12:46 AM UTC on February 7. The advisory covers areas expecting rapid temperature drops leading to flash freezing conditions this evening, as stated in the Sterling, VA Weather Forecast Office product KWX-SPSLWX disseminated via mesonet.agron.iastate.edu. It specifies impacts for the listed waterways and counties in Maryland. This warning addresses immediate hazardous weather forming during the three-hour period ending at 12:46 AM UTC on February 7, according to the official NWS alert shared by @iembot_lwx on X.
