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

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-------- 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@xxxxxxxx GREGORY.GROSSHANS@xxxxxxxx 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@xxxxxxxx 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@xxxxxxxx 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

$$
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