2018: Not Yet Over, But Already Among the Top Ten Wettest in NYC

The northeastern United States has been rather soggy this year. With more than two weeks still left in 2018, many locations have already posted their wettest years on record.

Here in New York City, we have received 59.68 inches of rain to date, which is 12.08 inches above average. That means 2018 now ranks among the top ten wettest years ever recorded in the Big Apple.

Much of this impressive, and still building, total came down during several heavy rain events over the course of the year. Each of these caused street and subway flooding around the five boroughs. For the northeast region as a whole, heavy precipitation events increased 55% between 1958 and 2016, according to the latest National Climate Assessment.

Scientists attribute the increase in both frequency and intensity of heavy rain events to climate change. As greenhouse gases warm the atmosphere, the air is able to “hold” more water vapor. More specifically, according to the Clausius–Clapeyron relation, for every increase of 1°F, the saturation level of the atmosphere increases by about 4%. That means there is more water vapor available in the air to condense and fall as precipitation.

Credit: Climate Matters

November 2018: Seventh Wettest and Fourth Snowiest on Record in NYC

November was unusually cold in New York City this year. Highs ranged from a relatively balmy 72°F to a chilly 28°F. But, with 22 days posting below average readings, the cold won out in the end. The city’s mean temperature for the month was 44.5°F, which is 3.3°F below average.

In terms of precipitation, November was a month for the record books. The city received 7.62 inches of rain in Central Park, making it the seventh wettest November on recordSnowfall was also abundant, despite the fact that it all fell during a single storm. Central Park reported 6.4 inches of snow, setting set a new daily record for the date. It was also the earliest 6-inch one-day snowfall on record for the city and the largest one-day November snowfall since 1882. Moreover, that one snow event was enough to make this November the city’s fourth snowiest on record.

New York City, on average, sees 4.02 inches or rain and 0.3 inches of snow for the entire month of November.

 

Cold and Windy Conditions Expected for the Macy’s Thanksgiving Day Parade in NYC

The Macy’s Thanksgiving Day Parade is a long-standing holiday tradition in New York City.  For 92 years, it has marched rain or shine. Nevertheless, the weather has been a factor in the event several times over the years.

Famous for its giant character balloons, high winds are the main weather challenge for the parade. According to city guidelines, the multi-story balloons cannot fly if there are sustained winds in excess of 23 mph or gusts higher than 34 mph. These regulations were put in place following a 1997 incident where gusty winds sent the “Cat in the Hat” balloon careening into a light post, which caused debris to fall on and injure spectators.

The only time the balloons were grounded for the entire parade was in 1971, when torrential rain swept across the city. In 1989, a snowstorm brought the Big Apple a white Thanksgiving and the “Snoopy” and “Bugs Bunny” balloons had to be pulled from the parade because of damage from high winds.

This year, the wind could potentially be a problem again. Gusts are forecast to be between 20 and 30 mph during the parade hours. Temperatures are also expected to be a challenge. They are forecast to hover near record cold levels, with readings not getting out of the 20s. When the wind chill is factored  in, it will feel more like the single digits to low teens. This extreme cold will be more than a nuisance for holiday revelers, it will be dangerous. Frostbite is a real threat for anyone with exposed skin. So, bundle up if you are planning to be outside along the parade route.

Marching from West 77th Street to West 34th Street in Manhattan, the 92nd Annual Macy’s Thanksgiving Day Parade is scheduled to begin at 9 AM on Thursday morning.

Happy Thanksgiving!

Paddington Bear Balloon floats down 6th Ave in the Macy’s Thanksgiving Day Parade. Credit: Macy’s

First Snow of the Season in NYC Breaks Several Records

New York City saw its first snow of the season on Thursday and it was one for the record books.

According to the NWS, 6.4 inches of snow was measured in Central Park, setting a new daily record for the date. The previous record of 1 inch had been in place since 1906. It was also the earliest 6-inch one-day snowfall on record for the city and the largest one-day November snowfall since 1882.

These superlatives came as a bit of a surprise. The forecast originally called for a wintry mix with only a dusting of snow at the onset. However, the temperature was colder than expected and the snow hung on longer. This was largely the result of an area of high pressure to the north being stronger than forecast and therefore able to funnel air toward the city that was colder than anticipated. Closer to home, evaporative cooling also played a part.  The air near the surface was very dry as the storm moved into the area. This allowed some of the snow to evaporate as it fell, cooling the air even further. As result, the change over to rain was delayed by several hours.

While pretty to see, the snow caused a number of problems around the city. Widespread travel delays and falling trees were reported across the five boroughs. As it is only mid-November, many of the trees still had their leaves. The combination of the heavy, wet, snow piling up on the foliage, weighing down the branches, and high winds was too much to bear for many trees, even the healthily ones. Many fell across streets and sidewalks as well as on top of parked cars. The city’s Parks Department has reported receiving over 2000 service requests for downed trees and dangling limbs.

This storm clearly outperformed expectations and caught the city off-guard. On average, New York City sees 0.3 inches of snow for the entire month of November.

Record breaking November snowfall topples trees in NYC. Credit: Melissa Fleming

NYC Monthly Weather Summary: October 2018

October had a split personality in New York City this year. It started off unseasonably warm, but then temperatures plunged dramatically in the middle of the month and remained mostly below average until Halloween. Highs ranged from a balmy 80°F to a brisk 50°F. But in the end, these extremes balanced each other out. The city’s mean temperature for the month was 57.7°F, which is only 0.8°F above average.

In terms of precipitation, the city was fairly dry. Overall, 3.59 inches of rain was measured in Central Park. Of this total, 35% fell in single day during the first nor’easter of the season. On average, the Big Apple gets 4.40 inches of rain for month. This October also marked first month since June that the city received below average rainfall.

Credit: The Weather Gamut

Flashback Facts: Sixth Anniversary of Hurricane Sandy

Today marks the sixth anniversary of Superstorm Sandy. Here is a look back at some of the facts from that historic storm.

  • Sandy was the largest hurricane to form in the Atlantic basin. Its tropical storm force winds spanned 900 miles in diameter.
  • Impacts from Sandy were felt across 24 states, from Florida to Maine and as far inland as Michigan.
  • The most severe damage occurred in New York and New Jersey.
  • The storm surge at The Battery in NYC reached a new record high of 13.88 feet, flooding the streets, tunnels, and subways of lower Manhattan.
  • Sandy was responsible for 72 deaths in the US. Of those, 44 were in NYC and 24 were in the city’s hard hit borough of Staten Island.
  • More than 8 million people across 21 states lost power because of the storm.
  • Sandy caused more than $70 billion in damage.
  • It was the fourth costliest storm in US history after Katrina, Harvey, and Maria.

Superstorm Sandy. Credit: NOAA

First Nor’easter of the Season Slams NYC

The first nor’easter of the season slammed the northeastern United States on Saturday. Heavy precipitation, strong winds, and coastal flooding were reported across the region.

Here in New York City, the storm dumped 1.34 inches of rain in Central Park. Its powerful winds knocked down trees and caused power outages around the city’s five boroughs. The storm also caused significant travel delays, including shutting down part of the FDR Drive because of flooding.

While nor’easters are not uncommon at this time of year, this one was interesting because it started off as a hurricane in the eastern Pacific. Hurricane Willa made landfall near Mazatlan, Mexico on Tuesday night and then moved inland toward Texas. From there, the storm’s remnants merged with a cold front and became re-energized. Traveling in the jet stream, it worked its way up the eastern seaboard and became a nor’easter.

First nor’easter of the season downed trees and branches in Queens. Credit: D. Herrick

Fall Finally Arrives in NYC

After an unusually warm September and a rather balmy start to October, it finally felt like autumn in New York City this weekend.

According to the NWS, the temperature in Central Park only made it to 55°F on Saturday and 58°F on Sunday. The overnight lows were also rather chilly in the mid-40s. This was the coldest weather the city has seen since last spring. Its rather sudden arrival was a bit a jolt for many New Yorkers who had to scramble to find their jackets and sweaters that had been tucked away for months.

The average high and low for NYC at this time of year is 65°F and 51°F, respectively.

Credit: The Weather Gamut

Summerlike Heat in October for NYC

The calendar says October, but it still feels like summer in New York City.

The temperature in Central Park soared to an unusually balmy 80°F on Wednesday. While this did not break any records, the overnight low did.  The mercury only dropped to 71°F, setting a new record warm minimum temperature for the date. The previous record of 69°F had been in place since 1949.

It is also interesting to note that Wednesday’s low was warmer than the date’s normal high. The city’s average high and low temperatures for this time of year are 66°F and 52°F, respectively.

New record warm low temperature set in NYC. Credit: The Weather Gamut

September 2018: Unusually Warm And Wet in NYC

September 2018 was another temperature roller coaster in New York City. Highs ranged from an unseasonably cool 62°F to a sizzling 93°F. However, with fifteen days posting above average temperatures, including three with readings in the 90s, the heat won out in the end. This warm finish was also aided by the unusually balmy overnight lows that were seen throughout most of the month. In fact, on September 5, the low only dropped to 77°F. That tied the record high minimum temperature for the date, which was set in 1985. In the end, the city’s mean temperature for the month was 70.7F°, which is 2.7°F above average.

In terms of precipitation, September was a soggy month in the Big Apple. In all, 6.19 inches of rain was measured in Central Park. Of this impressive total, 51% fell on just two days, each of which saw flash flooding around the five-boros. The city, on average, gets 4.28 inches of rain for the entire month.