NOUS41 KWBC 301455

PNSWSH     

 

Service Change Notice 17-40

National Weather Service Headquarters Washington DC

1055 AM EDT Thu Mar 30 2017

 

To:      Subscribers:

         -NOAA Weather Wire Service

         -Federal Aviation Administration (FAA) Offices

         -NOAAPORT

         Other NWS Users, Partners and Employees

 

From:    William Bauman

         Chief, Aviation and Space Weather Services Branch

 

Subject: Add Experimental Aviation Surface Forecast and Aviation

         Cloud Forecast Graphics, effective March 30, 2017

 

Effective on Thursday, March 30, 2017, the Experimental Aviation

Surface Forecast and Aviation Cloud Forecast graphics will be

added to the Satellite Broadcast Network (SBN) also known as

NOAAPORT.

 

The experimental Aviation Surface Forecast and Aviation Cloud

Forecast graphics are snapshot images derived from a subset of

the aviation weather forecasts. The graphics are valid for the

continental United States (CONUS) and coastal waters used within

the  Experimental Graphical Forecasts for Aviation (GFA)

interactive web-based display, which will become operational

effective 4/13/17, see Service Change Notice 17-31:

 

http://www.nws.noaa.gov/om/notification/scn17-31awc_exp_graphics.htm

 

The static images are provided every 3 hours for one CONUS

projection and nine regional projections with 3-hourly forecasts

of Surface (predominant weather, visibility, wind) and cloud

coverage and layer (bases and tops) information out to 18 hours.

Details of the forecast graphics can be found in the Product

Description Document (PDD):

 

http://products.weather.gov/PDD/PDD_AviationForecastGraphics_4_17.pdf

 

The FAA, pursuant to Title 49 United States Code Section 44720,

established requirements for this weather information and

service which is necessary for the safe and efficient conduct of

operations in the National Airspace System. These graphics

provide a low-bandwidth alternative to the GFA interactive 

web-based display and are provided through NOAAPORT/SBN and via

the Aviation Weather Center Web page. The static images are

intended for FAA Flight Service Stations (FSS) providers,

commercial and General Aviation pilots, operators, briefers and

dispatchers with limited Internet access.

 

These Portable Network Graphics (PNG) graphics will be available

over NOAAPORT/Satellite Broadcast Network. WMO header

information will be as follows:

 

T1T2A1A2ii CCCC

 - CCCC is KKCI (Aviation Weather Center)

 - T1 = Q (Regional Static Graphic)

 - T2 specifies the forecast graphic as follows:

      = I for the Aviation Clouds Forecast Graphic

      = Z for the Aviation Surface Forecast Graphic

 - A1 = T (Northern Hemisphere)

 - A2 specifies the forecast time as follows:

      = B for the 3 hour forecast

      = C for the 6 hour forecast

      = D for the 9 hour forecast

      = E for the 12 hour forecast

      = F for the 15 hour forecast

      = G for the 18 hour forecast

 - When T2 = I, ii specifies the regional domain of the Aviation

Clouds Forecast Graphic as follows:

      = 00 for Continental United States

      = 01 for Northeastern United States

      = 02 for Eastern United States

      = 03 for Southeastern United States

      = 04 for North Central United States

      = 05 for Central United States

      = 06 for South Central United States

      = 07 for Northwestern United States

      = 08 for Western United States

      = 09 for Southwestern United States

 - When T2 = Z, ii specifies the regional domain of the Aviation

Surface Forecast Graphic as follows:

      = 90 for Continental United States

      = 91 for Northeastern United States

      = 92 for Eastern United States

      = 93 for Southeastern United States

      = 94 for North Central United States

      = 95 for Central United States

      = 96 for South Central United States

      = 97 for Northwestern United States

      = 98 for Western United States

      = 99 for Southwestern United States

 

Additionally, the Experimental Aviation Surface Forecast and

Aviation Cloud Forecast Graphics can be found at:

 

https://www.AviationWeather.gov/gfa/plot

 

Although requirements for the underlying meteorological

information currently provided through the legacy text Area

Forecast (FA) have not changed, the FAA recognizes that, given

modern advances within NWS, the legacy text FA is no longer the

best source of en route flight planning weather information.

Retiring the FA and transitioning to more modern digital and

graphical forecasts will allow the NWS to focus the efforts of

forecasters on maximizing operational benefit to aviation end

users, resulting in improved weather information to 

decision-makers.

 

Based on comments received by the FAA and other NWS users on

this proposed change, NWS plans to discontinue production of

FAs. This termination will occur once the experimental GFA

interactive web-based display and the experimental Aviation

Surface Forecast and Aviation Clouds Forecast graphics are

operational and any concerns identified within submitted

comments have been addressed. Formal public notification will be

provided in advance of the action to discontinue the FAs.

 

The effective date of this change is sooner than specified by

NWS policy (NWS Instruction 10-1805). The reduction of the

normal advance lead time was requested by local users (FAA

Flight Service Stations providers).

 

If you have any questions regarding the experimental Aviation

Surface Forecast and Aviation Cloud Forecast Graphics, please contact:

 

Kevin Stone

Meteorologist

National Weather Service Headquarters

Silver Spring, MD

301-427-9363

Kevin.Stone@noaa.gov

 

National Service Change Notices are online at:

 

http://www.nws.noaa.gov/om/notif.htm

 

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