00:00 Well when we talk about tropical systems we often talk about wind shear.
00:04 Bernie Raynaud takes a closer look at how wind shear is playing a part in Edalia's
00:08 development this week.
00:11 Well in tonight's weather wise segment we are going to take a look at wind shear which
00:15 has been a big player in Edalia's development in the last day or two.
00:22 It's not just wind shear when you're looking for development of a tropical system.
00:26 Not only do you need the warm water which we typically have this time of year and this
00:29 year.
00:30 This year water has been exceptionally warm in the Atlantic Basin.
00:33 Also if dry air gets in toward the center of the circulation that can also weaken it.
00:39 But in the last 24 hours it's really been the wind shear that has played a major role
00:44 in Edalia.
00:45 Yesterday the wind shear was quite strong and that's why it took a time to develop.
00:51 Now in a perfect situation when you have low wind shear this is what you get.
00:55 You get that vertical stacking of the center of circulation from the surface to the middle
01:00 part of the atmosphere.
01:01 And if you think about it if you get that center of circulation stacked that's why you
01:05 can look down and see the eye and see right through it.
01:08 That happens when you have light wind shear.
01:10 The structure of the hurricane or storm stays intact and it will strengthen or at least
01:16 maintain its strength.
01:17 But if you start getting an increase in winds in this case as you go high in the atmosphere
01:21 more out of the west you get a tilting of that center of circulation.
01:26 So that's when you lose the eye of the hurricane and that's also when a tropical system it
01:32 gets disrupted and weakens.
01:35 It's all about that wind shear.
01:36 So if it's less you get the vertical stacking.
01:38 If you get more you get more of a tilt and that's when the system weakens.
01:43 And you can also see it on the water vapor loop as we are tracking Edalia here this evening.
01:50 The one thing you can see is you don't see any winds coming against the movement north.
01:55 It's going with the movement and you're also seeing this even what we call little outflow
02:00 where you're getting the wind spreading away from the center of circulation.
02:05 That means you have low wind shear and that's why Edalia is strengthening.
02:09 (thud)
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