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  2. Chicago weather: Dense fog, drizzle expected to linger ...

    www.aol.com/chicago-weather-dense-fog-drizzle...

    CHICAGO - Light drizzle and patchy fog are in the forecast for the morning hours. As the day progresses, skies will remain cloudy and temperatures are expected to climb into the mid-40s by this ...

  3. When will widespread fog go away in central, eastern US? - AOL

    www.aol.com/weather/widespread-fog-away-central...

    Fog is considered dense when the visibility is 1/4 of a mile or less. Nationwide, there were more than 1,100 weather-related flight delays on Thursday morning, according to FlightAware.com. On ...

  4. Storms impact holiday travel in parts of U.S.

    www.aol.com/storms-dense-fog-threaten-holiday...

    Earlier, the National Weather Service in Fort Worth had issued various watches and warnings for flash floods, dense fog, tornadoes and thunderstorms in different parts of the region Thursday morning.

  5. Visibility - Wikipedia

    en.wikipedia.org/wiki/Visibility

    The international definition of fog is a visibility of less than 1 km (3,300 ft); mist is a visibility of between 1 km (0.62 mi) and 2 km (1.2 mi) and haze from 2 km (1.2 mi) to 5 km (3.1 mi). Fog and mist are generally assumed to be composed principally of water droplets, haze and smoke can be of smaller particle size.

  6. List of National Weather Service Weather Forecast Offices

    en.wikipedia.org/wiki/List_of_National_Weather...

    The National Weather Service operates 122 weather forecast offices. [1] [2] Each weather forecast office (WFO or NWSFO) has a geographic area of responsibility, also known as a county warning area, for issuing local public, marine, aviation, fire, and hydrology forecasts. They also issue severe weather warnings, gather weather observations, and ...

  7. Weather forecasting - Wikipedia

    en.wikipedia.org/wiki/Weather_forecasting

    The first computerised weather forecast was performed by a team composed of American ... and fog. [93] Severe weather advisories and alerts are broadcast ...

  8. Forecast update: Treacherous freezing fog sends Tri-City ...

    www.aol.com/news/treacherous-freezing-fog-sends...

    Icy fog is expected to stick around for another day or so.

  9. Severe weather terminology (United States) - Wikipedia

    en.wikipedia.org/wiki/Severe_weather_terminology...

    A Short-Term Forecast NOW (alt., NOWcast) is an event-driven narrative outlook of near-term weather conditions within the Weather Forecast Office’s area of responsibility, typically valid for a three- to seven-hour period. The product outlines any ongoing or recently occurring conditions—based on radar analysis, satellite imagery and other ...