January 28, 2011 - Cloud streets off eastern United States and Canada

Cloud streets off eastern United States and Canada

Between two major and debilitating storms, a cold Arctic air mass brought bitter chill, moderate snow, and strong winds to the eastern United States and Canada. On January 24, 2011, the snow clouds finally parted, allowing the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Terra satellite to capture this spectacular true-color image of the winter-bound region.

A frosty white glaze covers the tan land of the northeastern United States and the provinces of Quebec, New Brunswick, and Nova Scotia, Canada. Off the entire eastern coast, a massive bank of clouds stretches far across the Atlantic Ocean in delicately arcing, parallel rows. These formations, known as “cloud streets”, have been sculpted by the prevailing westerly winds. When strong wind emerging from a cold surface blows over the warmer, moister atmosphere over the open ocean, cylinders of spinning air may develop in very regular, linear patterns. Clouds form along the upward cycle in the cylinders, where the air is rising, while skies remain relatively clear along the downward cycle, where air is falling. The result is a remarkably regular striped pattern of parallel lines in the clouds.

On January 24, when this image was captured, intense snow squalls with winds up to 100 km/hr were reported across Newfoundland. Even inland, in Quebec City, winds of 41 km/hr, along with bitter cold lows of -28°C were recorded. Newfoundland is in the upper right corner of this image, mostly hidden under a thick layer of snow-bearing clouds. These clouds, much like those over the ocean, align with the westerly wind. Wispy clouds on the far left of the image can also be seen aligned in a similar direction.

This image was captured in relatively calm weather between two blizzards which pummeled the northeastern United States. The first storm, which formed in the Gulf of Mexico and swept northeastward, covered Texas with white on January 8, then ended on January 13 after dumping over two feet of snow in parts of New England. The second, January 25 through 27, was a fast-moving, intense storm that brought 10-15 inches of fresh snow to most of New England and caused power outages to 650,000 in the Washington, DC metro area.

Image Facts
Satellite: Terra
Date Acquired: 1/24/2011
Resolutions: 1km ( B), 500m ( B), 250m ( B)
Bands Used: 1,4,3
Image Credit: Jeff Schmaltz, MODIS Land Rapid Response Team, NASA GSFC