weathertest3 - Conditions necessary to form a downslope...

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Conditions necessary to form a downslope windstorm in Colorado: 1. A stable layer upstream of the mountain a kilometer or two above the mountaintop is the first. This stable layer is usually an inversion layer and acts as a lid on the flow crossing the mountain beneath it. 2. The second is a strong pressure gradient across the mountain. Strong pressure gradients occur most when a surface high pressure system is located to the west over the Pacific or Great Basins Region and a low pressure system or a low pressure trough is present on the plains. 3. The background flow at levels at levels near the mountain top is typically strong and westerly. In order to have a Chinook in the Boulder area you need: 1. NVA (negative vorticity advection) in Jet max in So. Wyoming 2. Wind from W to NW 3. Inversion layer above mountain tops 4. Neutral stability from ground to inversion The difference between a Chinook and a Bora: Chinook is a warm dry downslope wind that forms along the East slope of the Rockies Bora is a cold downslope windstorm that develops along the Adriatic sea just southeast of the Dinaric Alps of Yugoslavia. More generally, any cold downslope windstorm.
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  • Fall '06
  • FORREST,BE
  • Thunderstorm, inversion layer, Airmass Thunderstorms, cold downslope windstorm

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