National Weather Service United States Department of Commerce

Heavy Rainfall & Thunderstorms in the Deep South & Gulf Coast; Critical Fire Weather Conditions for Southern California

A slow-moving frontal boundary will bring locally heavy rainfall, a few thunderstorms, and the potential of flash flooding to the Gulf Coast and much of the Southeast U.S. into Sunday. Meanwhile, dry and gusty conditions will again result in critical fire weather conditions for southern California. Another round of precipitation will impact the Pacific Northwest by late Sunday into Monday. Read More >

ZAN CWSU PLANNING BRIEFing

Refresh page for the latest information.

Refresh page for most current information. 

Anchorage Center Weather Service Unit (ZAN)

Mission:


Anchorage Center Weather Service Unit Center Weather Service meteorologists provide weather support and consultation to FAA air traffic managers and controllers. Rerouting of aircraft around hazardous weather is based largely on forecasts provided by the CWSU meteorologist. National products issued by the CWSU meteorologist include Center Weather Advisories (CWA) and Meteorological Impact Statements (MIS). The CWA is a short term advisory valid for two hours or less describing areas of hazardous weather in progress or forecast to develop. The MIS is a forecast product valid up to 12 hours describing areas of weather that may impact air traffic operations.


Operations:


ZAN CWSU meteorologists provide formal weather briefings to FAA supervisors within the Anchorage Air Route Traffic Control Center (ARTCC) for the day and evening shifts. Verbal briefings are given to individual controllers at the ARTCC and tower control facilities around the ZAN airspace, as well as to equipment technicians when weather conditions dictate. Two types of written products are also provided by the CWSU meteorologists. The Meteorological Impact Statement (MIS) is a 4 to 12 hour planning forecast of weather conditions expected to impact the ZAN air traffic. The Center Weather Advisory (CWA) is a short-term warning of hazardous weather conditions provided to all aviation interests, including private pilots, towers, flight service stations, and commercial airlines. Thus, a CWA is similar to but more localized than Airmets and Sigmets issued by the Alaska Aviation Weather Unit (AAWU).