Major Winter Storm Moves Through the Mid-Atlantic; High Winds Coming to Southern California

A major winter storm will move from the Ohio Valley to the Mid-Atlantic today, continuing severe travel delays, with major impacts due to areas of heavy snow and some icing for portions of West Virginia, Maryland, Virginia, Washington D.C., and Delaware. High winds will impact much of southern California Tuesday into Wednesday possibly resulting in power outages and fire weather. Read More >

Getting The Word | Climatology | Winter Storms | Definitions

Whenever winter weather threatens, your National Weather Service Forecast Office will issue watches, warnings, advisories, and statements to keep you informed and prepared.

Winter Storm Outlook

Issued when there is a good chance of a major winter weather event beyond 36 hours.

Winter Storm Watch

Issued when the following conditions are possible within 12 to 36 hours: heavy snowfall of 4 or more inches in 12 hours or 6 or more inches in 24 hours; freezing rain and/or freezing drizzle accumulating to a depth of 0.25 inches or greater; or heavy sleet accumulating to a depth of 1/2 inch or more.

Winter Storm Warning

Issued when the hazardous winter weather conditions defined above are occurring or expected to occur within 12 hours.

Freeze Warning

Issued for the first occurrence of freezing temperatures in the fall, for late freezes during the spring, or for a freeze expected to occur after a prolonged warm spell.

Winter Weather Advisory

Issued when either or all of the following are expected. Snow accumulations less than 4 inches in 6 hours, or less than 6 inches in 24 hours OR freezing rain accumulation less than 0.25 inch. OR freezing drizzle with little or no accumulation.

Wind Chill Advisory

Issued when forecast wind chill values will be below -20 degrees.

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Major Winter Storm Moves Through the Mid-Atlantic; High Winds Coming to Southern California

NWS Ft. Worth