ltpat228
Storm Tracker
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Posts: 201
Loc: Port Saint Lucie FL
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Quote:
There's some nice banding features, too, for a storm this far out to see on July 3rd.
What does "banding" mean regarding weather?
I've seen the word used several times when many of you speak about possible storms.
What is the importance of banding to a storm?
(Post moved to a more appropriate Forum.)
Edited by Ed Dunham (Wed Jul 04 2007 02:53 AM)
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Ed Dunham
Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017)
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Posts: 2565
Loc: Melbourne, FL
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From the site (Frequently Asked Questions):
"Convection in tropical cyclones is organized into long, narrow rainbands which are oriented in the same direction as the horizontal wind. Because these bands seem to spiral into the center of a tropical cyclone, they are sometimes called "spiral bands". Along these bands, low-level convergence is a maximum, and therefore, upper-level divergence is most pronounced above. A direct circulation develops in which warm, moist air converges at the surface, ascends through these bands, diverges aloft, and descends on both sides of the bands. Subsidence is distributed over a wide area on the outside of the rainband but is concentrated in the small inside area. As the air subsides, adiabatic warming takes place, and the air dries. Because subsidence is concentrated on the inside of the band, the adiabatic warming is stronger inward from the band causing a sharp contrast in pressure falls across the band since warm air is lighter than cold air. Because of the pressure falls on the inside, the tangential winds around the tropical cyclone increase due to increased pressure gradient. Eventually, the band moves toward the center and encircles it and the eye and eyewall form"
ED
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