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Between 1200 and 1500 UTC on 17 April 1999, a series of mesoscale eddies formed east of the Rocky Mountains in Colorado and Nebraska. Although generally clear skies prevailed, the eddies were strikingly apparent in the
Between 1200 and 1500 UTC on 17 April 1999, a series of mesoscale eddies formed east of the Rocky Mountains in Colorado and Nebraska. Although generally clear skies prevailed, the eddies were strikingly apparent in the
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PICTURE OF THE MONTH
Thunderstorm Outflows: Different Perspectives over Arid and Mesic Terrain
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The enhancement of cirrus cloudiness by orographic effects along the periphery of a large-scale thin cirrus cloud system is illustrated. From radiometric measurements and comparison with a nearby sounding, it was found that the cloud tops coincided with the tropopause. Their high emissivity suggests cloud condensation in liquid form, which quickly freezes to form long ice-crystal plumes. These crystals may have seeded a supercooled liquid-droplet low cloud to cause snow at the ground.
Abstract
The enhancement of cirrus cloudiness by orographic effects along the periphery of a large-scale thin cirrus cloud system is illustrated. From radiometric measurements and comparison with a nearby sounding, it was found that the cloud tops coincided with the tropopause. Their high emissivity suggests cloud condensation in liquid form, which quickly freezes to form long ice-crystal plumes. These crystals may have seeded a supercooled liquid-droplet low cloud to cause snow at the ground.
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No Abstract Available.
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No Abstract Available.