Hurricane Season 2020 Starts Monday

Earlier this month, Tropical Storm Arthur grazed the Outer Banks of North Carolina and “Tropical Storm Bertha” moved into South Carolina, marking the 6th year in a row that we had at least one named tropical system in the Atlantic before the “official” start of Hurricane Season, which runs from June 1 through November 30. That’s just the start of what looks to be an active hurricane season.

The list of Tropical Cyclone Names for the Atlantic for this season. Image provided by the National Hurricane Center.

Arthur produced wind gusts of up to 45 mph across the Outer Banks of North Carolina, with rainfall of 3-5 inches resulting in some flooding. Otherwise, it was a rather unremarkable storm, which is rather typical for early-season storms. Earlier this week, “Bertha” (we’re skeptical that it was really a tropical storm) brought heavy rain into parts of South Carolina. This is the 6th time since 1851 that we’ve had 2 named storms form before June 1 (1887, 1908, 1951, 2012, and 2016 are the others). Despite the early start for the past several years, the average date for the first named storm in the Atlantic is still in late June or early July. Over 97% of all named storms in the Atlantic form between June 1 and November 30. Like our first two storms this year, most early season storms tend to be on the weaker side. A hurricane hasn’t made landfall in the United States before July 1 since Hurricane Bonnie came ashore as a minimal hurricane near the Texas/Louisiana border on June 26, 1986.

Based on climatology, the most likely spots for an early season storm are in the Gulf of Mexico or northwest Caribbean. Image provided by the National Hurricane Center.

An early start is not always a harbinger of what the season will bring. NOAA issued their seasonal hurricane outlook last Wednesday, and it calls for a 60 percent chance for an above normal season, a 30 percent chance for a normal season, and a 10 percent chance for a below normal season. Many of the other hurricane outlooks issued by various outlets are also expecting a busy season, due to a number of factors. An average season consists of 12 named storms, of which 6 become hurricanes and 3 become major hurricanes (Category 3 or higher on the Saffir-Simpson scale). NOAA’s forecast for this season calls for 13-19 named storms, 6-10 hurricanes, and 3-6 major hurricanes. The Tropical Meteorology Project at Colorado State, the first group to forecast how active a hurricane season would be, originally led by Dr. Bill Gray, will issue their forecast on June 4. Their initial forecast from April called for 16 named storms, 8 hurricanes, and 4 major hurricanes. They also pegged the chance at a storm making landfall in the United States at 69% (52% is the average in any given year), and the odds of a storm making landfall along the East Coast at 45% (31% is the average). The last 5 seasons have all featured above normal activity across the Atlantic.

The 2019 Hurricane Season was an active one across the Atlantic Basin. Image provided by the National Hurricane Center.

A busy season does not always mean that multiple storms (or any storms for that matter) will impact the United States. In 2010, 19 named storms were observed in the Atlantic, 12 of them became hurricanes, and 5 were major hurricanes. Only one storm made landfall in the United States, and that was Bonnie, which was a minimal tropical storm at landfall. On the flip side, an inactive year doesn’t mean much for landfall probabilities as well. Only 7 named storms formed in 1992, and the 1st one didn’t develop until August 16. That storm, however, was named Andrew, and it made landfall just south of Miami as a category 5 storm.

Here in New England, we should always pay attention when a storm is nearing the Bahamas, as those are the ones that have the potential to impact us, and we are very overdue for a system to impact us. Using data back to 1851, here are some stats that show how overdue we are:

  • Since 1851, 36 storms of tropical storm strength of greater have made landfall in New England or Long Island, an average of one every 4.7 years. The longest we’ve ever gone without one is 11 years, between 1897 and 1908 and also between 1923 and 1934. We’re at 9 years since Irene, the last one to do so.
  • Since 1851, 28 strong tropical storms (maximum sustained winds of 60 mph or more) have made landfall in New England or Long Island, an average of one every 6 years. The longest we’ve ever gone without one is 20 years, between 1991 and 2011. We’re at 9 years since Irene, the last one to do so.  
  • Since 1851, a hurricane has made landfall in New England or Long Island 18 times, an average of one every 9.4 years. The longest we’ve ever gone between hurricane landfalls is 38 years, between 1896 and 1934. It’s been 29 years since Bob, our 2nd longest drought on record.
  • Since 1851, 9 hurricanes of Category 2 intensity or stronger have made landfall in New England or Long Island, an average of one every 18.8 years. The longest we’ve gone between hits by storms of that intensity is 69 years, between 1869 and 1938. We’re at 29 years since Bob, the last one to do so.
  • Since 1851, New England/Long Island has had 3 Major Hurricanes (Category 3 or higher) make landfall – an unnamed storm in October of 1869, the infamous 1938 Long Island Express, and Hurricane Carol in 1954. That’s an average of 1 every 56.3 years, and the longest time between 2 major hurricanes is 69 years (1869-1938). We’re at 66 years since Carol. There are also 3 documented storms from before 1851 – The Great Colonial Hurricane of 1635, the 1815 New England Hurricane, and the Norfolk and Long Island Hurricane of 1821. That’s it. That changes the numbers to 6 in 385 years, or one every 64.2 years, with a longest drought of 180 years.
Satellite photo of Hurricane Bob approaching New England. Bob was the last hurricane to make landfall in New England – 27 years ago. Image provided by NOAA.

We all saw what Sandy did in 2012, and that was a minimal hurricane that eventually made landfall in southern New Jersey. When (not if) the next big storm comes up the coast, much of this region will not be prepared for the storm or its aftermath.

The Atlantic is quiet right now, but some of the models show the potential for a system to develop over the next 7-10 days in the western Caribbean or the Bay of Campeche (we’re ignoring the cluster of cumulus clouds in the central Atlantic that the National Hurricane Center is “watching”). Even if something were to form off the East Coast in the next few weeks and head this way, the waters off of New England are much too cold to sustain a tropical system, so we’d see something more like a typical nor’easter. Only two tropical storms have ever made landfall in the Northeast before the end of June. The first was an unnamed minimal tropical storm that crossed extreme eastern Long Island and went into southeastern Connecticut on May 30, 1908. The other was Tropical Storm Agnes, which made landfall near New York City on June 22, 1972, then caused devastating flooding across parts of the Mid-Atlantic states. In terms of hurricanes, the earliest one to ever make landfall up this way was Hurricane Belle, which slammed into Long Island with 90 mph winds on August 9, 1976. We did have Hurricane Arthur pass just offshore of Nantucket on July 4, 2014. While it did not make landfall, it made for a rather wet and cool holiday, especially across Cape Cod and southeastern Massachusetts. Statistically, the most likely time for a hurricane to hit New England is between the middle of August and late September. Of the 18 hurricanes that made landfall in New England or Long Island since 1851, 16 of them have done so between August 19 and September 27.

The most likely time for a tropical system to impact our area is August of September. Image provided by the National Weather Service office in Norton, MA.

As always, you should get your weather information from a trusted source, especially when dealing with tropical systems. Much like with snowstorms in the winter, there will be plenty of hype and exaggeration on Twitter and Facebook, as well as people posting doom and gloom maps showing how a thunderstorm near the coast of Africa will develop into a Category 5 storm and head right for the East Coast in the next 2 weeks. We’re not among that group, we give you facts and our best forecasts, without any hype. If there’s reason to worry, we’ll let you know with plenty of advance warning. It’s always best to prepare ahead of the season. Chances are, you won’t have anything to worry about, but in case you do, it’s always good to be prepared, as we’ve learned recently.

One thought on “Hurricane Season 2020 Starts Monday

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s