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Beryl Holding On

A new flare up of thunderstorms to the south side of Beryl has maintained tropical storm force winds this morning. A hurricane hunter aircraft has been investigating the storm, and has once again found 45 knot winds at flight level in the thunderstorms. That will translate to winds of roughly 35 knots at the surface, meaning Beryl is still a minimal tropical storm. However, as Bryan pointed out last night, it looks to me like Beryl is some sort of hybrid tropical/extratropical low (Figure 1). I'm not the graphic artist that Bryan is, but Beryl definitely looks like a wrapped up occluded low this morning, with easy to pick out (for me, at least) occluded, cold and warm fronts. In their discussion this morning, NHC noted that the center of circulation is exposed, which as I mentioned last night, usually means the cyclone is getting sheared apart. However, according to the U. of Wisconsin shear analysis, shear is still less than 5 knots over Beryl (Figure 2). I think the reason the center is exposed is because of the frontal nature of the storm, where thunderstorms are popping up at the "fronts" rather than at the center of circulation. I will try and post again after the 11AM EDT advisory comes out. Stay tuned to the StormTrack for more.

Figure 1. Infrared satellite image of TS Beryl. If you look closely, you can pick out a warm front extending to the NE of Beryl and a cold front stretching to the SW.
Figure 2. Shear analysis from UW-CIMSS. The red "L" indicates the approximate position of Beryl. Beryl is located inside the 5-line, indicating shear is less than 5 knots.

Posted by Adam Moyer | Permalink