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National Operational Hydrologic
Remote Sensing Center

NOHRSC Science and Technology

Mission Statement

The National Operational Hydrologic Remote Sensing Center (NOHRSC) provides remotely-sensed and modeled hydrology products for the coterminous U.S. and Alaska for the protection of life and property and the enhancement of the national economy.

NOHRSC airborne, satellite, and modeled snow data and products are used by NWS, other government agencies, the private sector, and the public to support operational and research hydrology programs across the nation. The NOHRSC produces snow products and information that include estimates of: snow water equivalent, snow depth, snow pack temperatures, snow sublimation, snow evaporation, estimates of blowing snow, modeled and observed snow information, airborne snow data, satellite snow cover, historic snow data, and time-series for selected modeled snow products.


The National Operational Hydrologic Remote Sensing Center (NOHRSC) ingests daily ground-based, airborne, and satellite snow observations from all available electronic sources for the coterminous U.S. These data are used along with estimates of snowpack characteristics generated by a physically-based snow model to generate the operational, daily NOAA National Snow Analyses (NSA) for the coterminous U.S. The NOHRSC snow model is an energy-and-mass-balance, spatially-uncoupled, vertically-distributed, multi-layer snow model run operationally at 1-km² spatial resolution and hourly temporal resolution for the nation. Ground-based and remotely-sensed snow observations are assimilated daily into the simulated snow-model state variables. NOHRSC NSA output products are distributed in a variety of interactive map, text discussion, alphanumeric, time-series, and gridded formats. NSA product formats include: (1) daily national and regional maps for nine snowpack characteristics, (2) seasonal, two-week, and 24 hour movie-loop animations for nine snowpack characteristics, (3) text summaries, (4) a suite of interactive maps, text, and timeseries products, and (5) selected gridded snow products for the CONUS. The NSA provide information about snow water equivalent, snow depth, surface and profile snowpack temperatures, snowmelt, surface and blowing snow sublimation, snow-surface energy exchanges, precipitation, and weather forcings in multiple formats.

NOHRSC Overview

A recorded teleconference
presented by Carrie Olheiser
Length: 50:11 (56.3 MB)
Date: 2012-12-18
Audio only (12 MB)
NOHRSC Overview: a recorded teleconference presented by Carrie Olheiser
Software and plugin information can be found here.

NWS NOHRSC Policy and Snow Requirements

NOAA's National Snow Analyses (NSA)

Airborne Gamma Snow Survey Program

National Snowfall Analysis

Satellite Snow Cover Mapping Program

Operational Product Generation

Public Presentations

NOHRSC Publications

NOHRSC GIS Applications and Documentation

Mission Statement  |  Contact

National Weather Service
National Operational Hydrologic Remote Sensing Center
Office of Water Prediction
1735 Lake Drive W.
Chanhassen, MN 55317

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Page last modified: Oct 31, 2022 - cloud
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