Tuesday, November 8, 2011

Subtropical Storm Sean developed early Tuesday morning

Our next named system of the 2011 Tropical Season developed early Tuesday morning east of the Bahamas in the Atlantic Ocean. Here's the latest color-infrared satellite image of the convection in Sean:

Subtropical Storm Sean will not impact the U.S., but it should track near Bermuda at the end of this week, bringing tropical storm force winds, rain, and rough waves. Here's the official forecast track for Sean from the National Hurricane Center:

So what does it mean to be a "subtropical" storm as opposed to a "tropical" storm? Sean possesses both characteristics of a tropical (warm-core low pressure system) and an extratropical (cold-core low pressure system) cyclone. The low that became Sean in the Atlantic is part of the remnants of a system that tracked through the eastern U.S. last week and stalled off-shore, spinning as a closed low for days. It's a pretty shallow low pressure system, not as deep as a tropical cyclone would be. As you could see in the satellite image above, it also doesn't "look" like a typical circulation associated with a tropical cyclone, being asymmetrical. But because of the convection and gale-force winds and rough waves, it behaves like a tropical cyclone. Therefore, it can only be classified as "subtropical."

Stay with CBS 6, we'll keep you ahead of the storm.
--Meteorologist Carrie Rose

No comments: