Tuesday, November 24, 2020

Somalia Hurricane; Cape Cod Tornado Alerts: Two Weird Storms

Satellite view of Tropical Cyclone Gati striking
Somalia on Sunday. 
Hurricanes don't hit Somalia.  Tornadoes don't threaten Cape Cod in November. Until now, apparently. 

This past week, Somalia, in Africa, got hit by a compact, but powerful hurricane. 

As NPR reports:

"Tropical Cyclone Gati made landfall in Somalia on Sunday with sustained winds of around 105 mph. It's the first recorded instance of a hurricane - strength system hitting the country. At one point before landfall, Gati's winds were measured at 115 mph." 

This is the strongest tropical system on record in the norther Indian Ocean, and furthest south in the Indian Ocean. Tropical systems sometimes hit further north in Yemen and Oman, but not Somalia. 

Tropical Cyclone Gati also holds the record for the fastest intensification rate for any hurricane type storm in the northern Indian Ocean, with winds ramping up from 40 mph to 115 mph in just 12 hours. 

I have to say this seems consistent with climate change.  Warmer ocean water is fuel for tropical systems.  As larger areas of ocean water become warm enough to sustain hurricanes, chances are new places can be hit, and places that do normally see hurricanes are at risk for stronger ones. 

NPR reports:

"'With climate change were seeing warmer ocean temperatures and a more moist atmosphere that's leading to a greater chance of rapid intensification for tropical cyclones like Gati, meteorologist and climate journalist Eric Holthaus told NPR. 'Gati's strength is part of that broader global pattern of stronger storms.'"

As Gati was developing, it was small in area and came across an area of very light upper level winds, which allowed it to strengthen over warmer than normal Indian Ocean waters. "

 Tropical Cyclone Gati hit the northeastern corner of Somalia, a desert area that normally gets just four inches of rain per year.  Gati was expected to dump twice that in just two days. 

At least eight deaths were reported with Gati.  Widespread flooding hit much of Somalia, and wind damage was severe near where Gati made landfall.  

CAPE COD TORNADO WARNINGS

Tornado warnings went up for Martha's Vineyard and Cape Cod in Massachusetts Monday as a rotating thunderstorm swept through the area.  The scary weather was part of a storm system that was just starti to rapidly develop.

This storm brought widespread downpours and thunderstorms to New Jersey, the New York City area and southern New England as it organized. (Vermont got light rain and snow out of this). 

Possible funnel cloud over Cape Cod Monday during a 
tornado warning. Photo by Bart Jarek

Sometimes, the initial formation of what eventually becomes a strong storm can set off severe weather and even tornadoes. That type of thing, however, rarely happens this time of year in New England. 

It was the first time on record that the National Weather Service office in Boston saw fit to issue tornado warnings in November. 

I'm not sure if any tornado touched down in Massachusetts. There was briefly vague signs of a debris in the air near Yarmouth, but it's very unclear if that was produced by a tornado or just gusty winds.  Most of the rotation on radar was rather broad, and not tightly wound in small areas.  That broader rotation could well mean no tornado could get its act together and touch down.

People did report seeing a funnel cloud, and minor wind damage was reported on the Cape. 

I imagine the National Weather Service in Boston might investigate the area today.  

The storms did bring 1.5 to 2.5 inches of much needed rain to good sized chunks of southern New England. The rapidly deepening storm departed, bringing gusty winds and heavy rains to the Canadian Maritimes. 


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