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SERVICE CHANGE NOTICE 07-18...AMENDED
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
1113 AM EDT FRI JUL 13 2007

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

FROM:     THOMAS GRAZIANO
          ACTING CHIEF...HYDROLOGIC SERVICES DIVISION

SUBJECT:  AMENDED: ENHANCEMENTS TO ADVANCED HYDROLOGIC
          PREDICTION SERVICE WEB PAGES: EFFECTIVE DATE OF
          JULY 18 2007 POSTPONED: NEW DATE JULY 25 2007

AMENDED TO INDICATE THE EFFECTIVE DATE FOR ENHANCING SERVICES 
PROVIDED BY NOAA/S NATIONAL WEATHER SERVICE ON ITS ADVANCED 
HYDROLOGIC PREDICTION SERVICE WEB PAGES IS POSTPONED FROM JULY 
18 2007 UNTIL JULY 25 2007. ALSO AMENDED TO INCLUDE A WEBSITE 
FOR A SUMMARY OF NEW FEATURES.

BOTH CURRENT AND ENHANCED FEATURES ARE/WILL BE AVAILABLE AT:

     HTTP://WEATHER.GOV/AHPS/  

A SUMMARY OF NEW FEATURES IS AVAILABLE AT:

     HTTP://WWW.WEATHER.GOV/AHPS/AHPS_PHASE_V_END_USER_GUIDE.PDF

NEW CAPABILITIES WILL INCLUDE BOTH NATIONAL AND LOCAL MAPS 
SHOWING FORECAST RIVER LEVELS AND DISTRIBUTION OF OBSERVED 
PRECIPITATION. THE RIVER LEVEL FORECASTS WILL COMPLEMENT 
EXISTING MAPS OF OBSERVED RIVER LEVELS.

PRECIPITATION INFORMATION WILL DISPLAY SPATIAL VARIATION AT A 
RESOLUTION OF 4 KM. PRECIPITATION INFORMATION WILL BE SIMILAR TO 
AN EXISTING EXPERIMENTAL SERVICE AT:

HTTP://WWW.SRH.NOAA.GOV/RFCSHARE/PRECIP_ANALYSIS_NEW.PHP

IN ADDITION MUCH OF THE INFORMATION DISPLAYED ON THESE WEB PAGES 
WILL BE AVAILABLE FOR DOWNLOAD THROUGH THE MECHANISMS DESCRIBED 
IN THE FOLLOWING PARAGRAPHS.

1. XML

OBSERVATIONS AND FORECAST VALUES AT OVER 3700 LOCATIONS WILL BE 
AVAILABLE FOR DOWNLOAD IN AN EXTENSIBLE MARKUP LANGUAGE /XML/ 
FORMAT. NOTE: THIS CAPABILITY ALREADY EXISTS. IT IS NOT A NEW 
FEATURE. THE SCHEMA USED IS DOCUMENTED AT /USE LOWER CASE 
LETTERS/:

HTTP://WEATHER.GOV/OHD/HYDROXC/SCHEMAS/HYDROGEN/HYDROGENDATA.XSD

2. RSS

OBSERVED AND FORECAST RIVER LEVELS WILL BE AVAILABLE THROUGH A 
REAL SIMPLE SYNDICATION /RSS/ SUBSCRIPTION. AN OPTION OF THE 
SUBSCRIPTION SERVICE WILL PROVIDE INFORMATION ONLY WHEN RIVER 
LEVELS APPROACH OR EXCEED FLOOD STAGE. THIS SERVICE IS CURRENTLY 
AVAILABLE ON AN EXPERIMENTAL BASIS IN NORTHEASTERN PORTIONS OF 
THE COUNTRY. INFORMATION ON THE EXPERIMENTAL SERVICE IS 
AVAILABLE AT /USE LOWER CASE LETTERS/:

HTTP://WWW.WEATHER.GOV/AHPS/RSS/

3. GIS

INFORMATION WILL BE PROVIDED IN TWO GEOSPATIAL FORMATS: /3.1/ 
SHAPEFILES AND /3.2/ KEYHOLE MARKUP LANGUAGE / KML/KMZ /.

    3.1 SHAPEFILES

A SHAPEFILE CONTAINING RIVER OBSERVATIONS AND A SECOND SHAPEFILE 
CONTAINING RIVER FORECASTS WILL BE UPDATED HOURLY. THESE 
SHAPEFILES WILL INCLUDE INFORMATION ABOUT OBSERVATION/FORECAST 
LOCATIONS INCLUDING LATITUDE...LONGITUDE...LOCATION NAME AND 
RIVER.

GRIDDED PRECIPITATION BASED ON A CURRENT EXPERIMENTAL SITE WILL 
ALSO BE AVAILABLE IN SHAPEFILE FORMAT. FOR MORE INFORMATION SEE:

HTTP://WWW.SRH.NOAA.GOV/RFCSHARE/PRECIP_DOWNLOAD.PHP

    3.2 KEYHOLE MARKUP LANGUAGE FILES

KML FILES DEPICTING BOTH RIVER OBSERVATIONS AND RIVER FORECASTS 
WILL BE AVAILABLE FOR THE CONTIGUOUS UNITED STATES /CONUS/ AND 
ALASKA.

4. NETCDF

GRIDDED PRECIPITATION WILL ALSO BE AVAILABLE AS NETCDF FILES. 
FOR MORE INFORMATION...SEE:

HTTP://WWW.SRH.NOAA.GOV/RFCSHARE/PRECIP_DOWNLOAD.PHP

THIS AND OTHER NWS SERVICE CHANGE NOTICES ARE AVAILABLE ONLINE 
AT /USE LOWER CASE LETTERS/:

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

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