New links for Advanced Hydrologic Prediction Service pages

Uniform Resource Locator (URL) changes have been implemented for the Advanced Hydrologic Prediction Service (AHPS) web pages.  Bookmarked pages will be automatically redirected to the new URLs. Please update your bookmarks when redirected.

AHPS map

New Changes to our AHPS pages include:

  • More frequent updates to hydrograph pages. Updates should now be available approximately every 15 minutes
  • Improved river gage map displays

Specifically, the following changes have been made:

National River Conditions Point Map:

old url: http://www.weather.gov/ahps

new url: http://water.weather.gov

National Precipitation Analysis Map:

old url: http://water.weather.gov

new url: http://water.weather.gov/precip

National Precipitation Analysis Download Directory:

old url: http://water.weather.gov/p_download_new/

new url: http://water.weather.gov/precip/p_download_new/

National Precipitation Analysis-One Day

old url: http://water.weather.gov/p_download_new/2010/201003/nws_precip_20100304.tar.gz

new url: http://water.weather.gov/precip/p_download_new/YYYY/M/D/nws_precip_1day_observed_shape_YYYYMMDD.tar.gz

new url: http://water.weather.gov/precip/p_download_new/2010/3/4/nws_precip_1day_observed_shape_20100304.tar.gz

National River Conditions Real Simple Syndication Feeds:

old url: http://www.weather.gov/ahps/rss

new url: http://water.weather.gov/ahps/rss

Hydrologic Service Area Map pages

old url: http://xxxxxxxxxxx/ahps2/index.phpxxxx?wfo=zzz

new url: http://water.weather.gov/ahps2/index.php?wfo=zzz

example: http://water.weather.gov/ahps2/index.php?wfo=lot (use "lot" for NWS Chicago links)

Hydrograph pages...xml pages...and River Gauge Tabular pages will all have the following new domain name:

http://water.weather.gov

Hydrograph Pages - after the new domain name...the rest of the hydrograph page addresses will not change...that is...both the old and new addresses use:

/ahps2/hydrograph.php?wfo=zzz&gage=yyyyy&view=1,1,1,1,1,1,1,1

old url: http://old.domain.name/ahps2/hydrograph.php...

new url: http://water.weather.gov/ahps2/hydrograph.php...

example: http://water.weather.gov/ahps2/hydrograph.php?wfo=shv&gage=ncst2&view=1,1,1,1,1,1,1,1

xml Pages - after the new domain name, the rest of the address will change as follows:

old ending: /ahps2/xml/yyyyy_hgirg.xml

new ending: /ahps2/hydrograph_to_xml.php?gage=yyyyy&output=xml

old url: http://old_domain_name/ahps2/xml/yyyyy_hgirg.xml

new url: http://water.weather.gov/ahps2/hydrograph_to_xml.php...

example: http://water.weather.gov/ahps2/hydrograph_to_xml.php?gage=ncst2&output=xml


AHPS River Gauge Tabular Data pages – after the new domain name, the rest of the address will change as follows:

old ending: /ahps2/tabular.php?wfo=zzz&gage=yyyyy

new ending: /ahps2/hydrograph_to_xml.php?gage=yyyyy&output=tabular

old url: http://xxxxxxxxxxxx/ahps2/tablular.php?wfo=zzz

new url: http://water.weather.gov/ahps2/hydrograph_to_xml.php?gage=yyyyy&output=tabular

example: http://water.weather.gov/ahps2/hydrograph_to_xml.php?gage=ncst2&output=tabular


In the above examples, zzz is the NWS forecast office identifier and yyyyy is the NWS location identifier for a point along a river or stream.

Other pages follow the pattern in the examples above where the domain name immediately following http:// is  replaced with the new domain name water.weather.gov.

These changes have been made in conjunction with infrastructure changes to increase the reliability for  the NWS web-based hydrologic services.

These URL changes will not affect users who access NWS web-based hydrologic services through the tabs on the NWS main page at http://www.weather.gov. Users who access either the National River Conditions Point Map or other AHPS pages through bookmarks will be automatically redirected to the new URLs and can update their bookmarks after the redirection.

Users who currently bookmark the national precipitation map at water.weather.gov will be directed to the AHPS  main page. The National Precipitation Map will be accessible from a tab on the main page and the bookmark can be updated at that time.

Users who automatically interrogate the NWS Hydrologic Services Web Pages to obtain hydrologic forecasts and data will have to change the URL in their procedures so they access the correct web location.


Click here for printable PDF version of these changes


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