It’s official! We are having a heat wave in New York City.
The threshold for what constitutes a heat wave varies by region, but here in the northeast, it is defined as three consecutive days with temperatures reaching 90°F or higher. In Central Park, the temperature reached 90°F on Wednesday, 92°F on Thursday – setting a new record for the date – and then 91°F on Friday.
While heat waves are more common during the summer months, they have developed in the spring before. The last time one happened in May was May 2-4, 2001. The city’s earliest heat wave on record was April 16-18, 2002. This week’s event ranks as the sixth earliest, according to the NWS.
The main driver of this unseasonable heat is a stubborn Bermuda High, which is a large area of high pressure off the east coast. Spinning clockwise, it is ushering warm and humid air from the Gulf of Mexico into the region
The city’s normal high for this time of year is 72°F.
The calendar says May, but it felt more like July in New York City on Thursday. The temperature in Central Park soared to 92°F, setting a new record high for the date. The previous record of 90°F had been in place since 1936.
Wednesday was also a scorcher, producing the Big Apple’s first 90-degree day of the season. The normal high in NYC at this time of year is 71°F.
These dramatic temperatures are the result of a Bermuda High, a large area of high pressure situated off the mid-Atlantic coast. Spinning clockwise, it has been funneling very warm air from the Gulf of Mexico toward the northeast.
This type of heat can lead to the formation of ground-level ozone, which is why an air quality advisory was issued for the area. Anyone with repository concerns, like asthma, was advised to stay indoors.
While these temperatures are unseasonable, the city has seen 90° readings arrive even earlier. The earliest, according to NWS records, was April 7, 2010, when the mercury climbed to a sweltering 92°F.
If you are not quite ready for summer, fear not. Conditions more typical of May are expected to return this weekend.
Weather Whiplash for NYC. Credit: The Weather Gamut
Transitioning to spring, April was a month of wild temperature swings in New York City. We had highs that ranged from a chilly 48°F to a summer-like 87°F. However, with 19 out of 30 days posting above average readings, the warmth won out in the end.
The city’s mean temperature for the month was 57.2°F, which is a whopping 4.2°F above the long-term norm. That makes April 2017 the Big Apple’s second warmest April on record. Only April 2010 was warmer.
In terms of precipitation, April’s famous showers were slightly below normal with 3.84 inches of rain measured in Central Park. But of this total, the vast majority (74%) came down on three different, but very wet, days. The city usually sees 4.50 inches of rain for the month.
Credit: The Weather Gamut
It felt more like June than April in New York City on Tuesday. Building on the prior day’s spring heat, the temperature in Central Park soared to 80°F, marking the city’s first 80-degree day of the year.
Topping out at 20°F above average, the day was unseasonably warm. However, it was not a record breaker. That honor belongs to April 11, 1955, when the mercury soared to 84°F. On average, the city’s first 80-degree day does not show up until April 26.
Wearing short sleeves and enjoying lunch alfresco, many New Yorkers took full advantage of this summer preview. Some even celebrated the clash of the seasons by ice-skating in shorts at the rink in Rockefeller Center (photo below). More seasonable conditions are expected to return later this week.
Ice-skaters wore shorts at the rink in Rockefeller Center as the temperature soared to summer-like levels. Credit: Melissa Fleming
After a cold March and a chilly start to April, spring has finally sprung in New York City!
With a high temperature of 74°F in Central Park, Monday was the warmest day the city has seen since last October. Our normal high for this time of year is 59°F.
The primary driver of these balmy conditions is a strong Bermuda High off the mid-Atlantic coast that is funneling warm southern air into the region.
These warm temperatures, which are more common in late May than early April, are expected to last for a few days. Enjoy!
Trees and plants are starting to bloom in NYC. Credit: Melissa Fleming
Most people associate spring with flowers and mild weather. But as a transitional season, it can also produce a rollercoaster of temperatures, including serious cold spells. Wearing a short sleeved shirt one day and a parka the next, you may start to wonder when the cold will finally fade away.
The answer to that question largely depends on location. Below is a map from NOAA that shows the typical final freeze dates across the continental US. While actual weather conditions vary from year to year, the dates shown are based on climatology – a thirty-year average of temperature data.
Here in New York City, our last freeze of the season usually comes in mid-April.
Today is the Vernal Equinox, the first day of spring in the northern hemisphere. The new season officially began at 10:29 UTC, which is 6:29 AM Eastern Daylight Time.
Our astronomical seasons are a product of the tilt of the Earth’s axis – a 23.5° angle – and the movement of the planet around the sun. Today, as spring begins, the Earth’s axis is tilted neither toward nor away from the sun. This position distributes the sun’s energy equally between the northern and southern hemispheres.
Since the winter solstice in December, the arc of the sun’s apparent daily passage across the sky has been getting higher and daylight hours have been increasing. Today, the sun appears directly overhead at the equator and we have approximately equal hours of day and night. The word “equinox” is derived from Latin and means “equal night”.
As a transitional season, spring is a time when the chill of winter fades away and the warmth of summer gradually returns. The most noticeable increases in average daily temperature, however, usually lag the equinox by a few weeks.
Earth’s solstices and equinoxes. Image Credit: NASA
Our global temperature continued its upward trend last month with May 2016 marking the warmest May ever recorded on this planet.
According to the State of the Climate report by NOAA’s National Centers for Environmental Information, Earth’s combined average temperature for the month – over both land and sea surfaces – was 60.17°F. That is 1.57°F above the 20th century average and 0.04°F above the previous record that was set in 2015. Moreover, May marked the 13th consecutive month to break a global temperature record – the longest such streak on NOAA’s books.
The three-month period of March, April, and May – known as meteorological spring in the northern hemisphere – was also a record breaker. NOAA reports that Earth’s average temperature for the season was 1.91°F above the 20th century average of 56.7°F. That is 0.40°F above the previous record that was set just last year.
While heat dominated most of the planet this spring, some places were particularly warm, including large parts of North America. Here in the US, Alaska marked its warmest spring ever recorded while Washington and Oregon posted their second and third warmest, respectively.
These soaring temperatures, scientists say, were fueled by a combination of El Niño, which has now dissipated, and the long-term trend of human-caused climate change. Research by Climate Central’s World Weather Attribution Program shows that while El Niño gives global temperatures a boost, the majority of the temperature increase is due to rising levels of greenhouse gases in the atmosphere. It should also be noted that no other strong El Niño event has produced temperature anomalies as large as the ones seen recently.
Year to date, the first five months of 2016 were the warmest such period on record. This strengthens the likelihood that 2016 will surpass 2015 as the Earth’s warmest year ever recorded. Global temperature records date back to 1880.
May 2016 was the warmest May on record, globally. Image credit: NOAA
2016 is well on track to being the next warmest year on record. Image credit: NOAA
The calendar says mid-May, but it felt more like March in New York City this weekend.
After a warm spring day on Saturday with readings in the 70s, a cold front swept through the region ushering in significantly cooler conditions. The high on Sunday only reached 57°F, which is 13°F below average. This dramatic cool down was also accompanied by strong winds with gusts in excess of 40-mph.
Moving from Sunday into Monday, the over-night low in Central Park fell to a chilly 43°F. That is the coolest May temperature the city has seen in three years. It was also just one degree shy of tying the record low of 42°F set in 1878. Our normal low temperature for this time of year is 54°F.
With Memorial Day – the un-official start of summer – just two weeks away, many New Yorkers will be happy to hear that temperatures are expected to rebound to more seasonable levels later this week.
A massive wildfire is raging in Alberta, Canada. Situated in the heart of that country’s oil-sands region, it is known as the Fort McMurray Fire.
Charring 772 square miles of parched land since it started on May 1st, it is now one of the worst wildfires the area has ever seen. As of Sunday, according to local officials, more than 1,600 structures have been destroyed and more than 88,000 people have been forced to evacuate.
Only a few days after it began, the fire became so large and intense that it started producing its own weather, including pyrocumulus clouds and lightning.
While the exact cause of the fire remains under investigation, unusually warm temperatures, low humidity, and high winds have been helping to fuel the blaze. But, like many other weather-related events this year, El Niño also played a role. It brought the region a dry autumn and winter followed by a warm spring, which created tinderbox conditions that just needed a spark.
This wildfire, according to the Alberta Emergency Management Agency, is still burning and is expected to take months to fully contain.
The Fort McMurray Wildfire rages in Alberta, Canada. Credit: The Star/ CP