NOUS41 KWBC DDHHMM AAA PNSWSH Technical Implementation Notice 12-09 Amended National Weather Service Headquarters Washington DC 215 PM EDT Thu Nov 1 2012 To: Subscribers: -Family of Services -NOAA Weather Wire Service -Emergency Managers Weather Information Network -NOAAPORT Other NWS Partners, Users and Employees From: Tim McClung Science Plans Branch Chief Office of Science and Technology Subject: Amended: Addition of Experimental 2.5-km GFS-based Gridded MOS Guidance for the CONUS to SBN and NOAAPORT Effective on or about November 15, 2012 Amended to announce dissemination of experimental 2.5-km Global Forecast System (GFS)-based gridded MOS guidance for the CONUS across the Satellite Broadcast Network (SBN) and NOAAPORT. On or about Thursday November 15, 2012, beginning with the 1200 Universal Coordinated Time (UTC) model run, the NWS Meteorological Development Laboratory will disseminate experimental GFS-based 2.5-km gridded MOS guidance for the CONUS across the SBN and NOAAPORT. The experimental 2.5-km guidance will continue to be available on the NWS FTP server in GRIB2 format. GRIB2 file names for each gridded MOS element are listed in Table 1 below. New WMO communication identifiers for these products are shown in Table 2 below. These MOS products contain guidance on a 2.5-km Lambert Conformal grid covering the same expanse as the National Digital Forecast Database (NDFD) CONUS grid. Grids are being generated from the 0000 and 1200 UTC model runs at projections of 1 to 7 days in advance. Guidance is available for the following elements: Daytime Maximum and Nighttime Minimum Temperature 2-Meter Temperature 2-Meter Dewpoint Temperature Relative Humidity Wind Direction Wind Speed Wind Gusts Probability of Precipitation /6-h and 12-h/ Probability of a Thunderstorm /3-, 6-, and 12-h/ Quantitative Precipitation Amount /6-h and 12-h/ Total Sky Cover 24-h Snowfall Amount A Web page providing more information regarding grid specifications, GRIB2 encoding and elements for which guidance is available is referenced below. These GRIB2 products are already available in the experimental area of the National Digital Guidance Database (NDGD) on the NWS ftp server. Forecast guidance for days 1 through 3 is available at: ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.mo sgfs/AR.conus/VP.001-003/ Forecast guidance for days 4 through 7 is available at: ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.mo sgfs/AR.conus/VP.004-007/ Table 1: GRIB2 file names for each experimental 2.5-km GFS-based Gridded MOS element: FILE NAME ELEMENT ds.sky.bin Total Sky Cover ds.wdir.bin Wind Direction ds.wspd.bin Wind Speed ds.pop12.bin 12-Hour Probability of Precipitation ds.temp.bin 2-Meter Temperature ds.td.bin 2-Meter Dew Point Temperature ds.maxt.bin Daytime Maximum Temperature ds.mint.bin Nighttime Minimum Temperature ds.qpf06.bin 6-h Quantitative Precipitation Amount ds.pts06.bin 6-h Probability of a Thunderstorm ds.rhm.bin Relative Humidity ds.snw24.bin 24-h Snowfall Amount ds.pop06.bin 6-Hour Probability of Precipitation ds.qpf12.bin 12-h Quantitative Precipitation Amount ds.wgust.bin Wind Gusts ds.pts12.bin 12-h Probability of a Thunderstorm ds.pts03.bin 3-h Probability of a Thunderstorm Table 2: Communication identifiers for the experimental GFS-based 2.5-km gridded MOS GRIB2 products. Each GRIB2 product has a unique WMO header. Listed below are representations of the WMO headers for each element. A complete list of the WMO headers is available at: http://www.nws.noaa.gov/mdl/synop/gmos/gmos2p5headers.pdf WMO HEADER ELEMENT YAUXXX KWBQ Total Sky Cover YBUXXX KWBQ Wind Direction YCUXXX KWBQ Wind Speed YDUXXX KWBQ 12-Hour Probability of Precipitation YEUXXX KWBQ 2-Meter Temperature YFUXXX KWBQ 2-Meter Dew Point Temperature YGUXXX KWBQ Daytime Maximum Temperature YHUXXX KWBQ Nighttime Minimum Temperature YIUXXX KWBQ 6-h Quantitative Precipitation Amount YJUXXX KWBQ 6-h Probability of a Thunderstorm YRUXXX KWBQ Relative Humidity YSUXXX KWBQ 24-h Snowfall Amount YUUXXX KWBQ 6-Hour Probability of Precipitation YVUXXX KWBQ 12-h Quantitative Precipitation Amount YWUXXX KWBQ Wind Gusts YXUXXX KWBQ 12-h Probability of a Thunderstorm YYUXXX KWBQ 3-h Probability of a Thunderstorm The experimental 2.5-km products are an addition to the gridded MOS suite, not a replacement for the current 5-km gridded MOS guidance. Customers who use the 5-km guidance over the CONUS can continue to use these products without disruption until all customers and systems are able to use the higher resolution guidance. A Web page outlining the gridded MOS guidance and the FTP server structure can be found at: http://www.nws.noaa.gov/mdl/synop/gmos.php For questions regarding the experimental 2.5-km gridded MOS guidance for the CONUS please contact: Kathryn Gilbert MDL/Silver Spring, Maryland 301-713-0023, Ext. 130 Kathryn.Gilbert@noaa.gov Links to all MOS products and descriptions are at: http://www.nws.noaa.gov/mdl/synop NWS national TINs are online at: http://www.weather.gov/os/notif.htm $$