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Bryce J. Weinand
Introduction

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 Geostationary Operational Environmental Satellite-8 (GOES-8) water vapor imagery (Figs. 1–3). This case is unusual in that multiple eddies formed in a linear fashion and were well structured for a long temporal period. Initially there was a total of four eddies; only two of the eddies lasted 21 h. The eddies were approximately 150 km (93 mi)

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Robert A. Maddox

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James J. Gurka and Vincent J. Oliver

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Edward C. Johnston

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PICTURE OF THE MONTH

Thunderstorm Outflows: Different Perspectives over Arid and Mesic Terrain

Sherwood B. Idso

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Thomas C. Wann

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Donald R. Cochran

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TERRY R. SCHOENI

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JOHN H. CONOVER

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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.

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JOHN E. SHAUGHNESSY and THOMAS C. WANN

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