quote:
Philippe Papin
@pppapin
Brief vertical wind shear (VWS) loop last 12h before #Hurricane #Laura's landfall. Guidance is consistent VWS increases quite a bit in the last 6h before impact.

Not enough time for significant weakening Frowning face, but I do not expect RI to continue to the coast like in Michael (2018).

Notice the storms over S. Louisiana (red circle) are going nearly straight up, indicating very low shear. The storms over SE TX (blue circle) have the tops streaking off towards the east, indicating high shear. When does that start impacting the storm? Literally, hours can make a difference here.

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Posted by Impotent Waffle

Baton Rouge

Member since Sep 2007

9736 posts

Posted on 8/26/20 at 3:18 pm to rds dc

quote:
Notice the storms over S. Louisiana (red circle) are going nearly straight up, indicating very low shear. The storms over SE TX (blue circle) have the tops streaking off towards the east, indicating high shear. When does that start impacting the storm? Literally, hours can make a difference here.

Wait... What? We ask you questions

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Posted by Tigerpaw123

Louisiana

Member since Mar 2007

17316 posts

Posted on 8/26/20 at 3:19 pm to rds dc

quote:
Notice the storms over S. Louisiana (red circle) are going nearly straight up, indicating very low shear. The storms over SE TX (blue circle) have the tops streaking off towards the east, indicating high shear.

Great explanation and graphic, now I understand shear

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Posted by Bobby OG Johnson

Member since Apr 2015

25753 posts

Posted on 8/26/20 at 3:24 pm to rds dc

quote:
Philippe Papin
@pppapin
So how will we know the the VWS is acting on #Laura's inner core?

Watch KLCH radar, where eroding southern eyewall may be the first sign VWS is beginning to advect dry air into the inner core. That is not apparent yet (weak S echos now likely just distance from radar).