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The Closing of the 2020 Atlantic Basin Hurricane Season #546594
12/01/20 05:23 AM
12/01/20 05:23 AM
Joined: Oct 1999
Posts: 77,176
oregon, spr
Marty Offline OP

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Marty  Offline OP
Monday 30th November, marks the closing of the 2020 Atlantic Basin Hurricane Season. The Atlantic Basin Hurricane Season officially runs from June 1 to November 30 each year and it covers tropical cyclone activity spanning the North Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico.

The 2020 Atlantic Basin Hurricane Season was forecasted to be very active. The initial prediction was for there to be thirteen to nineteen (13 to 19) named storms, and of those, six to ten (6 to 10) were expected to become hurricanes and three to six (3-6) were expected to become major hurricanes (Category 3 or stronger). A subsequent forecast in August called for increased activity with a prediction of nineteen to twenty five (19-25) named storms. An average season in the Atlantic Basin consists of twelve (12) named storms, six (6) hurricanes and two (2) major hurricanes.

The 2020 season turned out to be an extremely active and record breaking season. A total of thirty (30) named storms formed with thirteen (13) of those named storms becoming hurricanes and six (6) becoming major hurricanes, reaching category three (3) or higher on the Saffir-Simpson Hurricane Wind Scale. Table 1 below, summarizes the 2020 Atlantic Basin Hurricane Season and compares this season's activity with that of the 2019 season and the 30 year average.

[Linked Image]

The main factors that supported the extremely active 2020 Atlantic Hurricane Season are:

(1) The development of a La Nina event during the latter half of the season;
(2) Warmer than average sea surface temperatures in the Tropical Atlantic Ocean and Caribbean Sea;
(3) Weaker vertical wind shear over the basin:
(4) Weaker Tropical Atlantic trade winds.

Of the thirty systems that formed during the season. Belize was affected by four (4). Of these four. one actually made direct landfall on the country. That was hurricane Nana which made landfall over southern Belize as a category 1 hurricane on the night of Wednesday, September 2, 2020. Prior to Nana, Belize was impacted by Eastern Pacific Tropical Storm Amanda which crossed Central America into the Gulf of Mexico and was renamed as Atlantic Basin Tropical Storm Cristobal. This system dumped heavy rainfall across the country resulting in flooding. Later in the season. Belize was impacted by Hurricanes Eta and Iota. Although these hurricanes did not make direct landfall on the country. they produced very heavy and continuous rainfall that resulted in severe flooding over the country.

While today marks the closure of the 2020 Atlantic Basin Hurricane season, history teaches us that systems do form outside of the season. The National Meteorological Service takes this time to encourage everyone to do a review of their 2020 hurricane plan, to see where their weaknesses and short-falls were, so that they can be better prepared if the need arises in 2021.

[Linked Image]

Re: The Closing of the 2020 Atlantic Basin Hurricane Season [Re: Marty] #546596
12/01/20 05:56 AM
12/01/20 05:56 AM
Joined: Oct 1999
Posts: 77,176
oregon, spr
Marty Offline OP

.
Marty  Offline OP

Historically Bad Hurricane Season Ends With Belize In Historic Flood Stage

Much to the relief of the hurricane-weary residents of the Caribbean and Central American Nations, the 2020 Atlantic Basin Hurricane Season ended today, November 30th.

But, as viewers are aware, this season was particularly punishing with all the named storms and major hurricanes. The season set all the worst kinds of records: There were 30 named storms, and 13 of those storms became hurricanes. Of those thirteen, 6 became major hurricanes at Category 3 strength or higher. That's a little bit more than double the number that forecasters estimated at the start of the season.

Today we spoke via teleconference with the Senior Climatologist at the National Met Services about the 2020 Hurricane season:

Shanea Young - Senior Climatologist, National Met Service
"This season was an extremely active season, with about 30 named storms, 4 of which affected Belize indirectly or directly in the months of September and also November."

"As I said, there were 30 named storms, 13 of which were hurricanes, 6 becoming major hurricanes, which is well above average, compared to the 30-year average. Normally, on average,12 named storms are held within a season, with 6 of them being hurricanes, and 3 becoming major hurricanes."

"We had a La Nina event for the latter half of the hurricane season, along with warm sea surface temperatures in the Tropical Atlantic, and also the Caribbean, along with weak vertical shear, and weaker trade winds over the area."

"I think the last season where we probably had something similar was in 2005, if I'm not mistaken, where we had - before - the previous record for the number of named storms in the season."

Of the 30 storms that formed, Belize was affected by 4. Of those, only one, Hurricane Nana, made direct landfall on the country. Prior to Nana, Belize was impacted by the Eastern Pacific Tropical Storm Amanda, which crossed Central America into the Gulf of Mexico, and was renamed as the Atlantic Basin Tropical Storm Cristobal. That system dumped heavy rainfall across the country, which resulted in flooding.

And, right now, Belize is still recovering from floods caused by the torrential rains of major hurricanes Eta and Iota. The government estimates that these hurricanes caused damage and losses to the tune of 150 million dollars or more countrywide.

According to the Senior Climatologist, the rainfall numbers from these hurricanes measured 4 times more than the 30 year average at their different automatic stations. Here's that part of our conversation:

Reporter
"Is this a record number of rainfall and floods, or is it just an extremely, abnormally high one?"

Shanea Young - Senior Climatologist, National Met Service
"Well, definitely, for the month of November, it is a very above-average season. In terms of record, I would need to go back and check further, definitely, some daily records have been broken, over most stations, but especially those in the central and some northern areas, since the month of November."

"For the first event, Hurricane Eta, Belmopan, Cha Creek, Hershey, La Milpa, Libertad, and other stations, including here at the airport, did break their records, mostly around the 4th, 5th, and 6th of November, and also around the 17th to the 19th of November with Hurricane Iota. So, most areas did experience, based on at least our automatic stations at the moment, the daily extreme for those particular stations during those days appears to have been broken."

"For instance areas like Gales Point, they have received, so far, about 829 millimeters, for the month of November it's normally around 191 millimeters. And also, in the Baldy Beacon area, they also received about 895 millimeters of rainfall this month, where the average is normally around 231. And at the airport, similarly, a value of 841 millimeters has been recorded so far for the month, and the long-term 30-year average is normally around 213.8."

A press release from the Met Office says, quote, "The National Meteorological Service takes this time to encourage everyone to do a review of their 2020 hurricane plan, to see where their weaknesses and short-falls were so that they can be better prepared if the need arises in 2021." End quote.

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