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PNSWSH 

TECHNICAL IMPLEMENTATION NOTICE 08-87 
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 
1205 PM EDT TUE OCT 28 2008 
 
TO:       SUBSCRIBERS:
          -FAMILY OF SERVICES
          -NOAAPORT
          OTHER NWS PARTNERS...USERS AND EMPLOYEES

FROM;     JASON TUELL
          CHIEF...SCIENCE PLANS BRANCH
          OFFICE OF SCIENCE AND TECHNOLOGY

SUBJECT:  ADDITION OF NCEP NAM-BASED CONUS-AREA DNG GRIDS
          TO NOAAPORT: EFFECTIVE DECEMBER 2 2008

EFFECTIVE TUESDAY DECEMBER 2 2008...WITH THE 1200 COORDINATED 
UNIVERSAL TIME /UTC/ DISTRIBUTION...NEW NATIONAL CENTERS FOR 
ENVIRONMENTAL PREDICTION /NCEP/ DOWNSCALED NUMERICAL GUIDANCE /DNG/ 
PRODUCTS...BASED ON THE NORTH AMERICAN MESOSCALE /NAM/ MODEL...WILL 
BE ADDED TO THE NOAAPORT TG2 CHANNEL. THESE NEW PRODUCTS CONSIST OF A 
SET OF SENSIBLE HYDROMETEOROLOGICAL PARAMETERS. THE PRODUCTS COVER 
THE CONUS AREA...ON A 5 KILOMETER HORIZONTAL RESOLUTION 
GRID...DISSEMINATED IN GRIB2 FORMAT.

THE EFFECTIVE DATE OF THIS CHANGE IS SOONER THAN SPECIFIED BY NWS 
POLICY /NWS INSTRUCTION 10-1805/. THE SHORTER ADVANCE LEAD TIME WAS 
DRIVEN BY CRITICAL OPERATIONAL REQUIREMENTS FOR FIELD FORECASTERS. 
WAIVER OF THE NORMAL ADVANCE LEAD TIME WAS APPROVED IN ORDER TO 
COMMENCE NWS FIELD EVALUATIONS OF THIS PRODUCT.

THE DNG PRODUCT SET CONSISTS OF SEVERAL SENSIBLE HYDROMETEOROLOGICAL 
ELEMENTS AT 3 HOUR FORECAST INTERVALS FROM 
00 TO 84 HOURS. THERE WILL BE FOUR PRODUCT DISTRIBUTIONS PER DAY 
CORRESPONDING TO THE 00...06...12 AND 18 UTC NAM MODEL RUNS.

THE DNG HYDROMETEOROLOGICAL ELEMENTS ARE:
  - SURFACE TEMPERATURE AND DEW POINT TEMPERATURE  
  - 3 AND 12 HOUR MAXIMUM AND MINIMUM TEMPERATURE
  - 3 AND 12-HOUR MAXIMUM AND MINIMUM RELATIVE HUMIDITY
  - TRANSPORT WIND SPEED AND DIRECTION...AND WIND GUST SPEED
  - U AND V COMPONENTS OF SURFACE WIND
  - CLOUD COVER 
  - 3...6...AND 12 HOUR PROBABILITY OF PRECIPITATION
  - 3...6...AND 12 HOUR QUANTITATIVE PRECIPITATION FORECAST
  - 3 AND 6 HOUR SNOWFALL DEPTH
  - WET BULB ZERO HEIGHT /SNOW LEVEL HEIGHT/
  - PLANETARY BOUNDARY LAYER HEIGHT /MIXING HEIGHT/
  - VISIBILITY

THE PER CYCLE DATA VOLUME WILL BE APPROXIMATELY 139 MEGABYTES 
/MB/ OR APPROXIMATELY 556 MB PER DAY.

THE WMO HEADINGS FOR THESE PRODUCTS WILL BE OF THE GENERAL FORM:

T1:     DATA FORMAT OF GRIB2 /L OR M/
T2:     PARAMETER CODE /ONE OF ADEHKRSTUVX/
A1:     GRID CODE /M FOR CONUS/ 
A2:     FORECAST TIME /ONE OF ABCDEFGHIJKL FOR T1=L OR
                        BEHKLMNOPQRSTZ FOR T1=M/
II:     LAYER OR LEVEL /98 FOR SURFACE OR 
                        86 FOR HEIGHT OF BOUNDARY LAYER OR
                        00 HEIGHT WHERE WET BULB TEMPERATURE
                           IS ZERO/ 
CCCC:   KWBE    

FOR A COMPLETE LISTING OF ALL DNG WMO HEADINGS...PLEASE REFER TO THE 
FOLLOWING WEB PAGE /USE LOWER CASE LETTERS/:

  HTTP://WWW.WEATHER.GOV/OS/NOTIFICATION/RESOURCES/DNG_WMO.PDF

FOR QUESTIONS CONCERNING THE TECHNICAL DETAILS OF THESE 
PRODUCTS...PLEASE CONTACT: 
 
  GEOFF MANIKIN
  NCEP/EMC...MESOSCALE MODELING BRANCH
  CAMP SPRINGS MARYLAND
  301-763-8000 X7263
  EMAIL: GEOFFREY.MANIKIN@NOAA.GOV
OR
  JEFF WALDSTREICHER
  NWS EASTERN REGION SCIENTIFIC SERVICES DIVISION
  BOHEMIA NEW YORK
  631-244-0131
  JEFF.WALDSTREICHER@NOAA.GOV 

FOR QUESTIONS CONCERNING THE NOAAPORT ACTIVATION AND DISSEMINATION OF 
THESE PRODUCTS...PLEASE CONTACT:
 
  BRIAN GOCKEL 
  NWS OFFICE OF SCIENCE AND TECHNOLOGY  
  SILVER SPRING MARYLAND 
  301-713-0304 EXT 158 
  BRIAN.GOCKEL@NOAA.GOV

TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT /USE LOWER CASE LETTERS/: 

  HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM

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