[nws-changes] 20070821: NDFD-exp convective outlook haz prob elem-: ADMIN NOTICE NOUS41 KWBC]

[Linda Miller]

-------- Original Message --------

265 
NOUS41 KWBC 211130
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 07-58
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 
730 AM EDT TUE AUG 21 2007

TO:        FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER 
           WIRE SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY MANAGERS
           WEATHER INFORMATION NETWORK /EMWIN/ SUBSCRIBERS...
           NOAAPORT SUBSCRIBERS...OTHER NATIONAL WEATHER SERVICE
          /NWS/ PARTNERS AND USERS...AND NWS EMPLOYEES 

FROM:      ELI JACKS
           CHIEF...FIRE AND PUBLIC WEATHER SERVICES BRANCH 

SUBJECT:   GRIDDED BINARY ENCODING AND DECODING CHANGES FOR 
           THE EXPERIMENTAL CONVECTIVE OUTLOOK HAZARD
           PROBABILITY ELEMENTS IN THE NATIONAL DIGITAL FORECAST
           DATABASE /NDFD/: EFFECTIVE SEPTEMBER 20 2007 

REFER TO:  TIN 07-05: NINE EXPERIMENTAL CONVECTIVE OUTLOOK
           HAZARD PROBABILITY ELEMENTS TO BE ADDED TO THE NDFD
           ON FEBRUARY 27 2007 AT 1400 UTC

NOTE:  THIS CHANGE ONLY IMPACTS SUBSCRIBERS TO THE SERVER ACCESS 
SERVICE OF THE FOS AND CUSTOMERS WHO DOWNLOAD AND DECODE THE 
GRIDDED BINARY EDITION 2 /GRIB2/ NDFD ELEMENT FILES FROM THE NDFD 
FILE TRANSFER PROTOCOL /FTP/ FILE SERVER.  CUSTOMERS WHO RECEIVE 
NDFD DATA IN OTHER WAYS OR FORMATS ARE NOT IMPACTED BY THIS 
CHANGE.

EFFECTIVE THURSDAY SEPTEMBER 20 2007 AT 0000 COORDINATED 
UNIVERSAL TIME /UTC/...A MINOR GRIB2 CODE CHANGE WILL BE MADE 
AFFECTING TWO OF THE NINE EXPERIMENTAL CONVECTIVE OUTLOOK HAZARD 
PROBABILITY ELEMENTS IN THE NDFD. THIS CHANGE ONLY AFFECTS USERS 
OF THE GRIB2 FORMAT OF THESE ELEMENTS.  THE SPECIFIC CHANGES ARE 
DESCRIBED BELOW. THESE EXPERIMENTAL NDFD ELEMENTS ARE GENERATED 
BY THE STORM PREDICTION CENTER /SPC/ IN NORMAN OKLAHOMA.

GRIB2 PARAMETER NUMBERS 203 AND 204 WERE INADVERTENTLY ASSIGNED 
TO TWO SETS OF UNRELATED PRODUCTS ISSUED BY SPC...INCLUDING TWO 
OF THE EXPERIMENTAL CONVECTIVE OUTLOOK HAZARD PROBABILITY 
ELEMENTS.  TO REMEDY THIS SITUATION...THE TWO EXPERIMENTAL 
CONVECTIVE OUTLOOK HAZARD PROBABILITY ELEMENTS ARE BEING 
REASSIGNED.  SPECIFICALLY...THE GRIB2 PARAMETER NUMBER FOR THE 
TOTAL PROBABILITY OF SEVERE THUNDERSTORMS FOR DAY 2 AND 3 WILL 
CHANGE FROM 203 TO 215 AND THE GRIB2 PARAMETER NUMBER FOR THE 
TOTAL PROBABILITY OF EXTREME SEVERE THUNDERSTORMS FOR DAY 2 AND 3 
WILL CHANGE FROM 204 TO 216. 

GRIB2 PARAMETER NUMBERS 203 AND 204 WILL REVERT TO BEING RESERVED 
FOR FUTURE USE.

THE WORLD METEOROLOGICAL ORGANIZATION /WMO/ HEADINGS OF THE 
AFFECTED NDFD ELEMENTS ARE:

                              PRODUCT PARAMETER
                              NUMBER CHANGING
  WMO HEADING   OUTLOOK DAY      FROM:    TO:
  -----------   ------------  ---------------------------------
  LDIZ30 KWNS       2            203      215
  LDIZ31 KWNS       2            204      216
  LDIZ40 KWNS       3            203      215
  LDIZ41 KWNS       3            204      216

NEW GRIB2 PARAMETER NUMBERS EFFECTIVE ON THE CHANGE DATE: 

 PD  CT  ID   NAME 
 000 019 215  SEVERE PROBABILITY 
 000 019 216  EXTREME SEVERE PROBABILITY 

 WHERE 
      PD=PRODUCT DISCIPLINE 
      CT=CATEGORY 
      ID=PRODUCT PARAMETER NUMBER 

THE GRIB2 PARAMETER NUMBERS ARE DOCUMENTED IN THE WMO GRIB2 
DOCUMENTATION...WHICH IS AVAILABLE ONLINE AT /USE LOWER CASE 
LETTERS/:

WWW.NCO.NCEP.NOAA.GOV/PMB/DOCS/GRIB2/GRIB2_TABLE4-2-0-19.SHTML

ON THE ABOVE EFFECTIVE DATE...THE NEW GRIB2 PARAMETER NUMBERS 
WILL BE USED TO ENCODE THESE ELEMENTS IN NDFD. ON THAT SAME 
DATE...AN UPDATED GRIB2 DECODER WILL BE AVAILABLE ONLINE AT 
/MIXED CASE LETTERS - USE LOWER CASE LETTERS EXCEPT UPPERCASE 
LETTERS ARE REQUIRED FOR NDFD_GRIB2D/:

WWW.WEATHER.GOV/MDL/NDFD_GRIB2DECODER/

MORE DETAILS REGARDING THESE SPC ELEMENTS ARE PROVIDED IN THE
PRODUCT DESCRIPTION DOCUMENT ONLINE AT /MIXED CASE LETTERS - USE 
LOWER CASE LETTERS EXCEPT UPPERCASE LETTERS ARE REQUIRED FOR 
PDD/9SPC_NDFD_PDD/:

     HTTP://PRODUCTS.WEATHER.GOV/PDD/9SPC_NDFD_PDD.PDF

IF SEPTEMBER 20 2007 IS A CRITICAL WEATHER DAY...THIS 
IMPLEMENTATION MAY BE POSTPONED. IN THAT CASE USERS WILL BE 
NOTIFIED OF THAT DECISION VIA TECHNICAL IMPLEMENTATION NOTICE AS 
FAR IN ADVANCE AS POSSIBLE. 

IF YOU HAVE ANY QUESTIONS REGARDING THESE PRODUCTS...PLEASE 
CONTACT: 

DR. RUSSELL SCHNEIDER              GREGORY GROSSHANS 
CHIEF...SCIENCE SUPPORT BRANCH     METEOROLOGIST 
STORM PREDICTION CENTER            STORM PREDICTION CENTER 
NORMAN OKLAHOMA                    NORMAN OKLAHOMA 
PHONE: 405-325-2066                PHONE: 405-325-2462 
RUSSELL.SCHNEIDER at NOAA.GOV         GREGORY.GROSSHANS at NOAA.GOV 

IF YOU HAVE QUESTIONS REGARDING THIS NOTICE...PLEASE CONTACT: 

    JOHN FERREE 
    OFFICE OF CLIMATE WATER AND WEATHER SERVICES 
    SEVERE STORMS SERVICE LEADER 
    NORMAN OKLAHOMA 
    EMAIL:  JOHN.T.FERREE at NOAA.GOV 

IF YOU HAVE TECHNICAL QUESTIONS REGARDING THE NDFD DATA...PLEASE 
CONTACT: 

    DAVID RUTH 
    CHIEF...MESOSCALE PREDICTION BRANCH 
    NATIONAL WEATHER SERVICE 
    OFFICE OF SCIENCE AND TECHNOLOGY 
    SILVER SPRING MARYLAND 
    EMAIL:  DAVID.RUTH at NOAA.GOV 

TECHNICAL IMPLEMENTATION NOTICES SPECIFICALLY RELATED TO THE NDFD 
ARE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/: 

     HTTP://WWW.WEATHER.GOV/NDFD/TINS.HTM

ALL NWS TECHNICAL IMPLEMENTATION NOTICES ARE POSTED AT /USE LOWER 
CASE LETTERS/: 

     HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM

$$