National Weather Service United States Department of Commerce

Winter Storm to Impact the Western and Central U.S.

A developing storm will impact the western mountain ranges through Thursday. This storm will track inland across portions of the Rockies, High Plains and upper Mississippi River Valley for the remainder of this week. Further south, the chance for severe weather will extend from the Ohio Valley into the lower Mississippi River Valley Friday into Friday night. Read More >

ZAN CWSU PLANNING BRIEFing

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IR Loop

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 24 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 24 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).