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Cloud Catalog select image below to enlarge cumulus cumulus from above pileus virga source: Lourdes Aviles Univ. of Illinois source: Robert Rauber Univ. of Illinois source: Glen Romine Univ. of Illinois source: Donna Charlevoix Univ. of Illinois cumulonimbus (supercell) anvil of cumulonimbus mammatus of cumulonimbus backsheared anvil source: Glen Romine Univ. of Illinois source: Glen Romine Univ. of Illinois source: Donna Charlevoix Univ. of Illinois source: Kevin Knupp Univ. of Alabama - Huntsville arcus/shelf cloud arcus/shelf cloud roll cloud wall cloud source: Glen Romine Univ. of Illinois source: Lourdes Aviles Univ. of Illinois source: Donna Charlevoix Univ. of Illinois source: Glen Romine Univ. of Illinois wave cloud contrail altostratus cirrus source: Robert Rauber Univ. of Illinois source: Robert Rauber Univ. of Illinois source: Robert Rauber Univ. of Illinois source: Lourdes Aviles Univ. of Illinois nimbostratus stratus stratus / stratocumulus Pacific stratocumulus source: Robert Rauber Univ. of Illinois source: Robert Rauber Univ. of Illinois source: Robert Rauber Univ. of Illinois source: Donna Charlevoix Univ. of Illinois cirrostratus cirrocumulus advection fog source: Donna Charlevoix Univ. of Illinois source: Robert Rauber Univ. of Illinois source: Donna Charlevoix Univ. of Illinois

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