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Maritime Tropical Air Mass Brings Summer Storms over Sonora Desert
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Maritime Tropical Air Mass Brings Summer Storms over Sonora Desert

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Canadian Tundra is Source Region for Cold Dry Air Masses

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Cold, Dry Air

from Canada

Brings

Frigid Winter Air

to the United States

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Air-MassSource RegionsforNorth America

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Air Masses Acquire the Temperature and Moisture Properties

of their Source Regions

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Lake-Effect Snow Belts

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Lake-Effect Snow

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cP Air-Mass Modified As It Crosses the Ocean

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Cumulus Clouds Developing when mT Air from the Gulf of MexicoMoves over Heated Land in the Summer

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Average AnnualPrecipitationin Eastern two-thirdsof the United States

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Monthly Precipitation Data for Tucson, Arizona;Summer Precipitation Results from MonsoonCaused by mT Air Mass from the Pacific Ocean

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Temperatures and Dew-Points at Weather Stations in the United States

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Surface

Weather Map

during 1989

Cold Wave

Caused

by cA Air

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Even ModernFrost-Prevention MethodsMay Not Be Able to Save Florida Citrus Cropsduring Cold Waves

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A Record 69 Inches of Lake-Effect Snow Fell in Chardon, OH in 1996

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Snow Totalsfrom 1996Lake-Effect Storm

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