NOUS41 KWBC 251152



Service Change Notice 13-67

National Weather Service Headquarters Washington DC

753 AM Fri EDT Oct 25 2013


To:       Subscribers:

            Family of Services

            NOAA Weather Wire Service

            Emergency Managers Weather Information Network


            Other NWS partners and employees


From:       Cynthia Abelman

            Chief, Aviation Services Branch


Subject:    Aviation Winter Weather Dashboard Operational

            November 25, 2013


Effective Monday, November 25, 2013, at 1800 Coordinated

Universal Time (UTC), the NWS Aviation Weather Center in Kansas

City, MO, will implement the Aviation Winter Weather Dashboard as

an operational product.


Beginning November 25, 2013, Aviation Winter Weather Dashboard

will be operationally available 24 hours a day, 7 days a week.


The Aviation Winter Weather Dashboard (AWWD) depicts a potential

winter weather impact to the core 30 airports. The AWWD is

updated four times per day. The website display indicates the

potential impact to each airport through a matrix of color coded

boxes that depict nominal (green), slight (yellow), moderate

(orange), and high (red) impact through 87 forecast hours.  The

impact information is calculated using the operational Short-

Range Ensemble Forecast (SREF) numerical weather prediction

system and climatology.


The AWWD was developed to support the Federal Aviation

Administration Air Traffic Control System Command Center. AWWD

supports long-range strategic winter weather planning by

providing guidance on the impact from winter weather at major



The Aviation Winter Weather Dashboard will only be available at:


The AWWD renders the potential impact to each airport, at 

3-hourly forecast intervals, based on certain thresholds of

forecast winter weather conditions. The probability of

accumulated snowfall/ice pellets, accumulated freezing rain, and

visibility are used to determine the particular impact category

assigned to each airport. The airports are split into four

separate impact groups, based upon the airport’s ability to

operate during winter weather conditions, which, in turn, is

based on annual snowfall climatology. Each group has a specific

probabilistic threshold for snowfall/ice pellets, freezing rain,

and visibility that determine the category.


For questions about this experimental forecast, please contact:


Michael Pat Murphy

Warning Coordination Meteorologist

Aviation Weather Center

Kansas City, MO 64153

Phone: 816-584-7239   



National NWS Technical Implementation Notices are available at: