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NATIONAL TECHNICAL IMPLEMENTATION MESSAGE 97-23
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
1130 AM EDT THU JUNE 19 1997
TO: NATIONAL WEATHER SERVICE /NWS/ EMPLOYEES... DIFAX
CUSTOMERS... NOAA WEATHER WIRE SERVICE /NWWS/
SUBSCRIBERS... FAMILY OF SERVICE /FOS/ SUBSCRIBERS...
OTHER NWS CUSTOMERS WHO RECEIVE NWS GRAPHIC PRODUCTS
FROM: THERESE PIERCE... CHIEF... HYDROMETEOROLOGICAL SERVICES
SUBJECT: CORRECTED VERSION OF MEDIUM RANGE TEMPERATURE AND
PRECIPITATION PROBABILITY FORECASTS... PREPARED BY THE
NWS HYDROMETEOROLOGICAL PREDICTION CENTER /HPC/...
IMPLEMENTED JUNE 12 1997
ON THURSDAY... JUNE 12 1997... THE IMPLEMENTATION OF THE
NATIONAL WEATHER SERVICE HYDROMETEOROLOGICAL PREDICTION CENTER/S
CORRECTED VERSION OF THE MEDIUM RANGE TEMPERATURE AND
PRECIPITATION PROBABILITY FORECASTS BECAME EFFECTIVE.
THE MEDIUM RANGE TEMPERATURE AND PROBABILITY OF
PRECIPITATION FORECASTS FOR DAYS 3... 4 AND 5 APPEAR ON AFOS
UNDER THE PILS 93P... 94P... AND 95P... RESPECTIVELY. THE DIFAX
SLOT NUMBERS ARE D247... PART 1 /POPS... DAY 3/ AND D162... PART
2 /DAY 4... DAY 5/. THESE CHARTS DEPICT THE VALUES AND ANOMALIES
OF MAXIMUM AND MINIMUM TEMPERATURE AND 24 HOUR PROBABILITY OF
PRECIPITATION AT APPROXIMATELY 110 STATIONS OVER THE 48
CONTIGUOUS STATES.
DURING THE TRANSITION FROM THE HDS 9000 TO THE CRAY
COMPUTER... SEVERAL ERRORS WERE INTRODUCED INTO THIS PRODUCT.
HPC FORECASTERS PREPARE FORECASTS FOR 58 CITIES. FOR THE OTHER
LOCATIONS... FORECASTS ARE GENERATED BY INTERPOLATING THE
CORRECTIONS TO MOS FROM NEIGHBORING STATIONS TO THE MOS AND
CLIMATOLOGY OF THE STATIONS. DURING THE TRANSITION... THIS
INTERPOLATION PROCESS WAS INITIALLY INCORRECTLY IMPLEMENTED...
RESULTING IN ERRONEOUS FORECASTS AT THOSE STATIONS WHERE
FORECASTS ARE INTERPOLATED. IN ADDITION... SEVEN STATIONS WERE
DROPPED FROM THIS DISPLAY DUE TO TECHNICAL LIMITATIONS AND TIME
CONSTRAINST.
NCEP PROGRAMMERS HAVE SINCE RECTIFIED THESE PROBLEMS.
ALL STATIONS DEPICTED ON THE PRODUCT PRIOR TO THE CONVERSION ARE
NOW AVAILABLE AND THE INTERPOLATION ALGORITHM HAS BEEN CORRECTED.
IN ADDITION... THE FOLLOWING 19 NEW STATIONS HAVE BEEN ADDED:
...STATION... ...ID... ...AFOS ZOOM STATION APPEARS...
SACRAMENTO CA SAC 16:1
KEY WEST FL EYW 4:1
WICHITA KS ICT 16:1
COVINGTON/CIN KY CVG 16:1
ALPENA MI APN 9:1
GLASGOW MT GGW 9:1
GREAT FALLS MT GTF 16:1
HELENA MT HLN 9:1
SYRACUSE NY SYR 16:1
ASHVILLE NC AVL 16:1
FARGO ND FAR 9:1
DAYTON OH DAY 16:1
TULSA OK TUL 9:1
COLUMBIA SC CAE 16:1
SIOUX FALLS SD FSD 16:1
AUSTIN TX AUS 9:1
LUBBOCK TX LBB 16:1
CEDAR CITY UT CDC 4:1 /REPLACES
4BL/
MILWAUKEE WI MKE 9:1
FOR FURTHER INFORMATION... CONTACT:
ACTING CHIEF... FORECAST OPERATIONS BRANCH
W/NP31... ROOM 410 WORLD WEATHER BUILDING
WASHINGTON... DC 20233
/301/ 763-8000 EXTENSION 7317 OR 7300
THIS AND OTHER NWS SERVICE CHANGE NOTIFICATIONS ARE AVAILABLE ON
THE NWS OFFICE OF METEOROLOGY/S HOME PAGE... IN THE NOTIFICATION
SECTION. THE ADDRESS OF THE NOTIFICATION SECTION IS:
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM
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