31 Oct '12, 12am

A dust storm in Alaska? A plume of 'glacial flour'? Weird but true. New view from our Aqua satellite.

A dust storm in Alaska? A plume of 'glacial flour'? Weird but true. New view from our Aqua satellite.

When glaciers grind against underlying bedrock, they produce a silty powder with grains finer than sand. Geologists call it “glacial flour” or “rock flour.” This iron- and feldspar-rich substance often finds its ways into rivers and lakes, coloring the water brown, grey, or aqua. When river or lake levels are low, the flour accumulates on drying riverbanks and deltas, leaving raw material for winds to lift into the air and create plumes of dust. That’s what was happening on October 23, 2012, when the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite acquired this image of northerly winds blowing a plume of dust from the Copper River delta out over the Gulf of Alaska. Dust storms are most common in Alaska in the fall, when river levels are at their lowest. Satellites have observed similar events in recent years. This dust storm was first noticea...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=79518

Tweets

This is fascinating: slicing through Sandy’s clouds:

This is fascinating: slicing through Sandy’s cl...

earthobservatory.nasa.gov 31 Oct '12, 10pm

Satellite instruments captured numerous images of Hurricane Sandy—using both daylight and moonlight —as the enormous storm...

Shell Ends Alaska Offshore Drilling for the Year

green.blogs.nytimes.com 31 Oct '12, 10pm

Shell Oil had its problems this year drilling off the Arctic coast of Alaska, but on Wednesday it declared success on the ...

オスプレイを強襲揚陸艦に並べた写真を見ると、米海軍の大きな強襲揚陸艦でもこの機体を運用するには甲板の幅が足りない気がする。ましてや海自のDDHでは… 

オスプレイを強襲揚陸艦に並べた写真を見ると、米海軍の大きな強襲揚陸艦でもこの機体を運用するには...

navy.mil 31 Oct '12, 12pm

GULF OF AQABA (Oct. 4, 2007) - U.S. Marine Corps MV-22 Ospreys, assigned to Marine Medium Tiltrotor Squadron (VMM) 263, Ma...

On Our Radar: From Birth to Landfall, the Storm...

green.blogs.nytimes.com 31 Oct '12, 6pm

Satellites captured a global view of Hurricane Sandy, from birth to landfall, between Oct. 21 and 30. Federal science agen...

Dust Storm in the Great Plains [image] #NASA

Dust Storm in the Great Plains [image] #NASA

earthobservatory.nasa.gov 20 Oct '12, 1pm

Parched by months of drought and searing heat, the Great Plains of the United States endured a widespread dust storm in mi...

Respect to @grroes who just announced a needs b...

irunfar.com 31 Oct '12, 7pm

I am excited to announce that beginning with the sessions next summer, Alaska Mountain Ultrarunning Camp will be offering ...

Hurricane #Sandy just before it made landfall this afternoon. Image from our Suomi @NASANPP satellite.

Hurricane #Sandy just before it made landfall t...

earthobservatory.nasa.gov 29 Oct '12, 11pm

On October 29, 2012, Hurricane Sandy approached the densely populated U.S. East Coast. An estimated 60 million Americans w...

Gotta LOVE homecomings!

navy.mil 06 Nov '12, 12am

NORFOLK (Nov. 3, 2012) Children welcome home their father and the crew of the Los Angeles-class attack submarine USS Norfo...

The most stunning images from Monster Storm Sandy

The most stunning images from Monster Storm Sandy

grist.org 30 Oct '12, 3pm

Well, that was a hell of a thing. It wasn’t too bad here in D.C., where only 21,000 people across the region lost power an...

Nuclear Plants Get Through the Storm With Littl...

green.blogs.nytimes.com 30 Oct '12, 10pm

European Pressphoto Agency The Oyster Creek nuclear plant in New Jersey, seen here in an undated photo provided by its own...

Nuclear Plants Get Through the Storm With Littl...

green.blogs.nytimes.com 30 Oct '12, 10pm

European Pressphoto Agency The Oyster Creek nuclear plant in New Jersey, seen here in an undated photo provided by its own...

#Nuclear Plants Get Through #Frankenstorm #Hurr...

green.blogs.nytimes.com 30 Oct '12, 11pm

European Pressphoto Agency The Oyster Creek nuclear plant in New Jersey, seen here in an undated photo provided by its own...