Content-Length: 5320 | pFad | http://www.theweatherprediction.com/habyhints2/630/
HABYTIME MINI LECTURE 45: STORM RELATIVE WIND
| HABYTIME MINI LECTURE 45: STORM RELATIVE WIND
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
METEOROLOGIST JEFF HABY
The wind “felt” by the storm is called the storm relative wind. An analogy is driving a car 50 miles per hour into a 20 mile per hour wind.
The wind sensed by the car is a 70 mile per hour wind. A storm moving into the wind field will result in an addition of the storm motion to
the wind interacting with the storm. A storm can move in a different direction as compared to the low level wind when directional shear
with height causes the storm to be influenced by the overall wind direction interacting with the storm. For example, winds from 700 to
300 may be strong from the west. While the wind at the surface may be strong from the southeast, the storm motion will be heavily influenced
by the west winds aloft.
Storm relative wind is important since it can allow a storm to inject energy and moisture faster than it could otherwise. Strong winds
moving into a storm can produce a greater Helicity, stronger convergence and stronger moisture convergence. An increase in heat, moisture
and momentum can be supplied to the updraft when the storm relative wind is stronger. The stronger storm relative wind will also enhance
speed and direction wind shear which contributes to horizontal vorticity.
|
|
|
--- a PPN by Garber Painting Akron. With Image Size Reduction included!Fetched URL: http://www.theweatherprediction.com/habyhints2/630/
Alternative Proxies:
Alternative Proxy
pFad Proxy
pFad v3 Proxy
pFad v4 Proxy