30 Mar '12, 12pm

Where snow wasn't this winter across the U.S. & Canada: map of data from NASA's Terra satellite.

View Image Comparison View Both Images One year after being pelted with widespread and abundant snowfall, much of North America stayed brown, gray, and green in the winter of 2011–12. Multiple weather patterns conspired to keep snow from forming and falling often, and warm air temperatures kept it from staying on the ground for long. This mostly snow-deprived winter should mean fewer spring floods, but also less snow melt filling reservoirs and lakes. These maps were made with data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite. The top map depicts snow cover in North America from October 1, 2011, to March 20, 2012; the lower map shows the same period in the autumn and winter of 2010 to 2011. The colors depict the percentage of days in which a parcel of land was covered by snow. The deepest blues had snow cover just 10 to 20 percen...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=77530

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