RUTGERS UNIVERSITY :: CLIMATE LAB :: GLOBAL SNOW LAB
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PRODUCTS
DOCUMENTATION
DAILY PRODUCTS
Northern Hemisphere
Visible Satellite Charts
    Daily
    Weekly
    Monthly
    Monthly Departure
    Monthly Climatology
    Documentation

Graphs
    Snow Anomalies
    Monthly Anomalies
    Seasonal Extent

Tabular
Area of Snow Extent
    Weekly
    Monthly
    Rankings
    Download

North America
Blended Snow Charts
    3-Way Pentads
    Station Pentads
    Microwave Pentads

Daily Products

Daily snow charts were generated by degrading 1024 x 1024 NOAA Interactive Multisensor Snow and Ice Mapping System (IMS) charts to 128 x 128 resolution. Each 128 x 128 grid cell is considered snow covered if 42 percent or more of the IMS cells within it are snow covered. Using charts produced on Mondays, this value most closely approximates the weekly snow product based on mean SCE area comparisons. An 89 x 89 cell subset matching the National Meteorological Center Limited-Area Fine Mesh grid is then charted, representing the northern hemisphere.

Climatology

Climatology percentages for each cell are generated for each day using weekly satellite data from September 1970 - August 2000. Each day falls within the dates of a GSL weekly snow chart and is represented by this value. The percentage of days indicated as snow covered for a given cell represents the number of years the cell was snow covered on the week representing that day. For departure maps, cells that are 50 percent or more snow covered in the climatology are considered snow covered in the calculation of daily departures.

Daily products span from the first operational IMS chart (November 1, 1998) to present and are updated daily at midnight. For questions regarding data manipulation or charting please use the online contact form.