GIS Products

SNOTEL Snow Water Equivalent	Current	1st of Month	Change
West-wide point maps	% of Normal Percentile Record  % of Normal Peak	-	-
State point maps	% of Normal Select a State Alaska Arizona California Colorado Idaho Montana Nevada New Mexico Oregon Utah Washington Wyoming	-	-
Basin-filled maps   NEW	% of Normal Select a Region West-wide Alaska Arizona Colorado Idaho Montana Nevada-California New Mexico Oregon Utah Washington Wyoming % of Normal Select a Region West-wide Alaska Arizona Colorado Idaho Montana Nevada-California New Mexico Oregon Utah Washington Wyoming	-	-
SNOTEL & Snow Course Snow Water Equivalent	Current	1st of Month	Change
West-wide point maps	-	% of Normal	-
State/basin filled maps	-	% of Normal for Alaska % of Normal by River Basin: Arkansas, Colorado and Rio Grande Columbia Great Basin and California Missouri	-
SNOTEL Snow Depth	Current	1st of Month	Change
West-wide point maps	Snow Depth	-	1 Day 3 Day 7 Day
State point maps	Snow Depth Select a State Alaska Arizona California Colorado Idaho Montana New Mexico Nevada Oregon Utah Washington Wyoming	-	-
SNOTEL Snow Density	Current	1st of Month	Change
West-wide point maps	Snow Density	-	-
State point maps	Snow Density Select a State Alaska Arizona California Colorado Idaho Montana New Mexico Nevada Oregon Utah Washington Wyoming	-	-

Definitions:

Snow Water Equivalent (SWE): The liquid water equivalent of the snowpack, expressed in terms of depth.
Water Year: October 1 to September 30
Normal: The 1971-2000 average.
% of Normal: The current value as percent of the current date’s normal.
% of Normal Peak: The current value as % of the normal seasonal peak for the year.
% of Normal to Date: In the case of precipitation, the current sub-seasonal total as % of the normal sub-seasonal total.
          Example: October 1-March 13 2005 / October 1 – March 13 Normal
          Example: March 1-March 13 2005 / March 1 – March 13 Normal
% of Monthly/Annual Total Normal: In the case of precipitation, the current sub-seasonal total as % of the normal seasonal total.
          Example: October 1-March 13 2005 / October 1 – September 30 Normal
          Example: March 1-March 13 2005 / March 1 – March 31 Normal
Percentile: Ranking with respect to data on the same day of the year for other years in the period of record. The ranking percentile is equal to the fraction of available years whose data is less than the current year’s value. 100% means that all other years are less than the present value. 0% means that all other years are greater than or equal to the present value.
Record: Is the current value a record or near record for the date? For example, a “new record high” means that the current value is now the highest value on record. A “near record high” means that the current value is exceeded or tied by only one other value on record. This is not necessarily an all-season record.
Anomaly: For temperature, the departure of the current value from the median of data on the same day of the year for other years in the period of record.
SNOTEL (SNOwpack TELemetry):  An automated near real-time data collection network that provides mid to high elevation hydroclimatic data from mountainous regions of the western United States.  A standard SNOTEL station provides snow water equivalent, snow depth, precipitation, and temperature data.  The SNOTEL network is maintained by the USDA Natural Resources Conservation Service Snow Survey and Water Supply Forecasting Program.
ACIS: Data served by the Regional Climate Centers and the NOAA National Climate Data Center’s “Applied Climate Information System”. This includes the Cooperative Observer Network, the Hourly Surface Airways Network and the Historical Climatology Network and other regional networks.
PRISM: The "Parameter-elevation Regressions on Independent Slopes Model" is a knowledge-based system that uses point measurements of precipitation, temperature, and other climate elements to produce continuous, digital coverages. These products were developed through a partnership between the NRCS National Water and Climate Center (NWCC) and the Spatial Climate Analysis Service (SCAS) at Oregon State University (OSU).

Disclaimer:

Data are provisional and subject to revision

Content Manager:

Tom Pagano