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With today's 5PM NHC #HurricaneBeryl update, the U.S. is now officially in the cone for the first time. Jamaica to Mexico to Texas.

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Archives 2010s >> 2010 News Talkbacks

Random Chaos
Weather Analyst

Reged:
Posts: 1024
Loc: Maryland

Igor
Wed Sep 15 2010 08:17 AM

Over the past 6 hours, the eye has completely collapsed and is attempting to regenerate. Microwave shows what appears to be a gigantic 60nm eye trying to form around the old 15-20nm eye that is barely hanging on. This is the 9:40utc microwave pass.

However, what I noticed that really grabbed my attention was the change in IR structure over the past 9 hours. Compare the two following pictures:

0215utc

1115utc

Note the complete shedding of outer convection and the wrapping of the outer bands over each other. This is classic preparation for an annular storm. From Wikipedia:

"Observations show that an eyewall replacement cycle can lead to the development of an annular hurricane. ... Annular hurricanes have been simulated that have gone through the life cycle of an eyewall replacement. The simulations show that the major rainbands will grow such that the arms will overlap, and then it spiral into itself to form a concentric eyewall. The inner eyewall dissipates, leaving a hurricane with a singular large eye with no rainbands."

That appears to be exactly what is happening with Igor. Igor is not yet annular, but it looks to be in the development process. The biggest hampering aspect is the southern rain band is not fully formed, meaning that the new outer eye is not 100%, allowing the old inner core to continue to be driven moisture from the south. Whether Igor completes the ERC and becomes annular or is able to regenerate the old eye and stay non-annular is yet to be seen.

Edited by Random Chaos (Wed Sep 15 2010 08:26 AM)

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Subject	Posted by	Posted on
Igor and Julia Category 4 and More	MikeC	Wed Sep 15 2010 08:17 AM
Re: Karl	Random Chaos	Wed Sep 15 2010 09:21 PM
Karl	danielw	Wed Sep 15 2010 07:46 PM
Re: Igor	Random Chaos	Wed Sep 15 2010 07:09 PM
Re: Igor	berrywr	Wed Sep 15 2010 06:26 PM
Re: Igor	Random Chaos	Wed Sep 15 2010 06:03 PM
Igor	Random Chaos	Wed Sep 15 2010 08:17 AM
Re: Tropical Storm Karl	berrywr	Wed Sep 15 2010 12:25 AM
Re: Tropical Storm Karl	Beaumont, TX	Tue Sep 14 2010 11:04 PM
Re: Tropical Storm Karl	Random Chaos	Tue Sep 14 2010 09:44 PM
Tropical Storm Karl	danielw	Tue Sep 14 2010 05:08 PM
Re: Igor Cat 4	JoshuaK	Tue Sep 14 2010 04:34 PM
Re: Igor Cat 4	Old Sailor	Tue Sep 14 2010 11:55 AM
Re: Igor Cat 4	JoshuaK	Tue Sep 14 2010 10:35 AM
Re: Igor Cat 4	danielw	Tue Sep 14 2010 07:44 AM
Re: Igor Cat 4	WeatherNut	Mon Sep 13 2010 10:47 PM
Re: Igor Cat 4	Random Chaos	Mon Sep 13 2010 10:03 PM
Re: Igor Cat 4	Random Chaos	Mon Sep 13 2010 06:37 PM
Re: Igor Cat 4	Storm Hunter	Mon Sep 13 2010 04:25 PM
Re: Igor Cat 4	JoshuaK	Mon Sep 13 2010 03:46 PM
Re: Igor Cat 4	Storm Hunter	Mon Sep 13 2010 01:32 PM
Re: Igor Cat 4	WPBSUE	Mon Sep 13 2010 01:21 PM
Re: Igor Cat 4	WeatherNut	Mon Sep 13 2010 11:43 AM
Re: Igor Cat 4	danielw	Mon Sep 13 2010 07:55 AM
Re: Igor Cat 4	Storm Hunter	Mon Sep 13 2010 01:16 AM
Re: Igor Cat 4	Random Chaos	Sun Sep 12 2010 11:34 PM
Re: Igor Cat 4	WeatherNut	Sun Sep 12 2010 10:13 PM
Re: Igor Cat 4	MikeC	Sun Sep 12 2010 07:16 PM
Re: Igor Cat 4	typhoon_tip	Sun Sep 12 2010 07:13 PM
Re: Igor Cat 4	WeatherNut	Sun Sep 12 2010 06:49 PM
Re: Igor Cat 4	Storm Hunter	Sun Sep 12 2010 06:22 PM
Igor Cat 4	danielw	Sun Sep 12 2010 05:25 PM
Re: Igor Stronger, And Two waves (92L and 93L)	MikeC	Sun Sep 12 2010 04:56 PM
Re: Igor Stornger, And Two waves (92L and 93L)	Random Chaos	Sun Sep 12 2010 04:24 PM
Re: Igor Stornger, And Two waves (92L and 93L)	WeatherNut	Sun Sep 12 2010 02:51 PM
Sunday Morning Lineup	danielw	Sun Sep 12 2010 11:21 AM
Re: Igor Stornger, And Two waves (92L and 93L)	Random Chaos	Sun Sep 12 2010 01:16 AM
Re: Igor Stornger, And Two waves (92L and 93L)	WesnWylie	Sat Sep 11 2010 09:27 PM
Re: Igor Stornger, And Two waves (92L and 93L)	typhoon_tip	Sat Sep 11 2010 06:48 PM
Re: Igor Stornger, And Two waves (92L and 93L)	berrywr	Sat Sep 11 2010 02:27 PM
Re: Igor Stornger, And Two waves (92L and 93L)	typhoon_tip	Sat Sep 11 2010 12:09 PM
Re: Igor Strengthening and 92L	RevUp	Sat Sep 11 2010 08:00 AM
Re: Igor Strengthening and 92L	berrywr	Fri Sep 10 2010 09:07 PM
Re: Igor Strengthening and 92L	typhoon_tip	Fri Sep 10 2010 07:59 PM
Re: Igor Strengthening and 92L	typhoon_tip	Fri Sep 10 2010 07:24 PM
Re: Igor Strengthening and 92L	Ed Dunham	Fri Sep 10 2010 07:09 PM
Re: Igor Strengthening and 92L	typhoon_tip	Fri Sep 10 2010 06:50 PM
Re: Tropical Storm Igor Forms in Eastern Atlantic	MikeC	Fri Sep 10 2010 06:03 PM
Re: Tropical Storm Igor Forms in Eastern Atlantic	ftlaudbob	Fri Sep 10 2010 04:19 PM
Re: Tropical Storm Igor Forms in Eastern Atlantic	MikeC	Thu Sep 09 2010 07:11 PM
Re: Tropical Storm Igor Forms in Eastern Atlantic	bobbutts	Thu Sep 09 2010 12:09 PM
Re: Tropical Storm Igor Forms in Eastern Atlantic	berrywr	Wed Sep 08 2010 11:05 PM
Re: Tropical Storm Igor Forms in Eastern Atlantic	rgd	Wed Sep 08 2010 07:00 PM
Clarification	Ed Dunham	Wed Sep 08 2010 03:47 PM
Re: Interesting how climatology seems to matter.	Jasonch	Wed Sep 08 2010 02:15 PM
Re: Tropical Storm Igor Forms in Eastern Atlantic	Storm Hunter	Wed Sep 08 2010 02:06 PM
Re: Tropical Storm Igor Forms in Eastern Atlantic	Jasonch	Wed Sep 08 2010 02:03 PM
Re: Interesting how climatology seems to matter.	stormtiger	Wed Sep 08 2010 01:56 PM

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