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Airplanes Can Cause Extra Rainfall

Phenomenon caused by holes punched in cloud cover

By the Associated Press

Posted Jul 1, 2011 12:23 PM CDT

(AP) – Airplanes flying through super-cooled clouds around airports can cause condensation that actually results in more snow and rain for nearby areas, according to a new study. The perfect conditions for such a freaky weather event occur about 5% of the time—but 10% to 15% in winter—according to the study’s lead author. Aircraft take off into the wind, so if they are generating extra ice particles upwind of an airport, the result can be snow right on the airport. That could mean planes will require more de-icing.

The team was investigating holes or canals that are sometimes seen drilled in clouds after an airplane has passed through. They found that increased snow and rainfall occurs in areas where the unusual cloud holes appear, usually within 60 miles of the airport. The added rain or snowfall occurred when the clouds were made up of water droplets that were colder than freezing, but which had not yet frozen: When an airplane passes through one of these clouds the movement causes a sudden cooling of the air, sometimes down to the critical point where the droplets freeze. They then can fall to earth as snow or rain.

This handout photo, taken Dec. 12, 2009, provided by the journal Science shows an aircraft-induced hole observed at the West Antarctic Ice Sheet Divide Camp, Antarctica.
This handout photo, taken Dec. 12, 2009, provided by the journal Science shows an aircraft-induced hole observed at the West Antarctic Ice Sheet Divide Camp, Antarctica.   (Eric Zrubek and Michael Carmody.)
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COMMENTS
Showing 2 of 2 comments
hatchling1
Jul 2, 2011 9:50 AM CDT
considering that my locale in South Florida, served by 4 major airports and hundreds of planes landing at each every day... is under the worst drought in recorded history, I seriously doubt this theory. You might also talk to the folks in the Southwest, also served by many airlines and airports, is under severe drought also ... 
finkster
Jul 1, 2011 12:44 PM CDT
So how much will it cost me to have them fly over my clouds to water my garden? 

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