The National Water Model (NWM) is a new product from the National Weather Service that forecasts streamflow volume and velocity over the entire continental United States. It is a hydrologic model that predicts the flow in every river reach of the National Hydrography Dataset, mathematically modeling physical processes like snowmelt, infiltration and the movement of water through soil layers in order to determine how much of the NWS precipitation forecast becomes runoff, then routing that runoff through the river network. This is the short term forecast, which is run every hour, predicting streamflow over the next eighteen hours at one hour intervals. Rivers are symbolized according to how the streamflow differs from the monthly normal.What Can You Do With This Layer?This map service is designed for fast data visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View forecast data sequentially using the time slider, which is set to one hour intervals by default, by Enabling Time Animation. This layer type is not recommended for use in analysis.Revisions:Sep 23, 2020: Updated 'qout' field values for Water Bodies. Null values are now being replaced with '-9999' in order to correct an identify issue at small scales. Also updated Pop-Up to reflect that the 'qout' value is Not Available (N/A).
OwnerThe Federal Emergency Management Agency (FEMA) - view all
Update frequencyunknown
Last updatedabout 1 year ago
OverviewFloodFlowForecastNFIENOAANWCNWMNWSStreamflowearth observationsesri_earthobslivefeeds2
Additional Information
KeyValue
dcat_issued2016-08-24T14:25:48.000Z
dcat_modified2022-06-01T16:15:31.000Z
dcat_publisher_nameEsri
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