What Causes Contrails?

Jet trails seemed to be extensive in the Joliet area Wednesday.

Jet trails occur rather naturally when the exhaust of a jet plane meets with the atmosphere.

"It’s a reaction of the atmosphere to the jet exhaust being let out," Richard Castro, National Weather Service meteorologist said. "They're basically artificial clouds.

"They're triggered by water vapor in the exhaust of the aircraft engines."

Castro said a lot of good information on contrails can be found here.


"They almost actually become clouds, almost," Castro said.

Teresa May 23, 2012 at 02:16 AM
Some of the projects listed with this company alone include: Aeromet, Inc. (L-3 Communications) - U.S Department of Defense BAMEX - Bow Echo and Mesoscale Convective Vortex Experiment CALIPSO - CloudSat Validation Experiment Delaware Department of Agriculture Cloud Seeding Program Edwards Aquifer Authority Federal Aviation Administration - Great Lakes Division Gratiot Weather Modification Project Illinois Weather Modification Projects National Oceanic and Atmospheric Administration (NOAA) National Oceanic and Atmospheric Administration - National Hurricane Center Naval Surface Warfare Center Nevada State Cloud Seeding Program New Mexico BLAST (Burst Light and Stratus Transmission) Project North Dakota Cloud Modification Project (NDCMP) North Dakota Thunderstorm Project - North Dakota Atmospheric Resource Board North Dakota Tracer Experiment - North Dakota Atmospheric Resource Board
Teresa May 23, 2012 at 02:18 AM
As far as these trails "disappearing" sooner, the "hang time" depends on what type of chemicals are being sprayed. There are many different kinds. Northeast Sampling Program - Sonoma Technology, Inc. NSF/NCAR ICE-L Field Campaign Oklahoma Weather Modification Project (OWMP) Panhandle Groundwater Conservation District Rainfall Enhancement Program Santa Barbara County Water Agency Sonoma Technology, Inc. Stanislaus Weather Modification Program State of South Dakota - Department of Natural Resources Division of Weather Modification Texas Central High Plains Rainfall Enhancement Program Texas Experiment in Augmenting Rainfall through Cloud Seeding (TEXARC) Texas Weather Modification Program The University of North Dakota - US Environmental Protection Agency University of Arizona - National Oceanic and Atmospheric Administration (NOAA) Upper American River Cloud Seeding Project Upper Payette River Basin Cloud Seeding Program Upper Tuolumne River Weather Modification Program Utah Division of Water Resources Utah Division of Water Resources West Central Texas Council of Governments Rainfall Enhancement Program Western Dakota Water Development District - Black Hills Council of Local Government Wyoming Weather Modification Pilot Program
Teresa May 23, 2012 at 02:24 AM
So, in closing Tim, I'm afraid you may be the one that needs the "tin foil hat". http://www.weathermodification.com/projects.php#projects I've been around these discussions for a very long time, and your silly comments will do no good with me. Good luck in a future filled with doctors, diseases, big pharma, and feeling like crap constantly.
Tim May 23, 2012 at 02:35 AM
I call Poe's Law; http://en.wikipedia.org/wiki/Poe%27s_law
Teresa May 23, 2012 at 02:43 AM
That's very profound Tim. At least David was man enough to "stand corrected".


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