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August 2016

Today in New York Weather History: August 27

 

1971

Rain from tropical storm Doria moved in shortly before daybreak and continued through early evening.  Rain fell heaviest between 1-3:00 PM, when 1.76" came down.  In total, 4.16" was measured - a record for the date.  Winds gusting to 40-50 mph accompanied the rain.  A second round of rain would dump an additional 1.80" between 1-7:00 AM on Aug. 28.  Rainfall amounts were even greater in New Jersey and southeastern Pennsylvania. 

 

Tropical_storm_doria    

1980

It was hot, hot, HOT, with a blistering high of 97°, sixteen degrees above average.

1987

The 0.39" of rain that fell between 5-6 AM was the first measurable rain since Aug. 10.

1989

This was the sixth day this month with a low in the 50s, the most in August in the 1970-2021 period (tied in 2007). 

1990

Today was the year's last reading in the 90s, on par with the average date for this occurrence.  In total, the year had a dozen days in the 90s - well below the average of eighteen days.  Between Aug. 3 and today, twelve days had morning lows of 68° or 69°.

2003

Today's low of 72° was the last low in the 70s of the year, more than two weeks earlier than the average date of Sept. 11.  (16 years have had it occur earlier, with 2009 added later).   

2011

During the evening, wind and rain from Hurricane Irene began lashing the area as it slowly made its way northward from the North Carolina and Virginia coasts.  By midnight, 2.88" of rain had fallen - with a lot more to come overnight.  As a precaution, New York's transportation system was shut down at noon and 350,000 residents were evacuated from low-lying areas.

 

HurricaneIrene

2012

In the late morning a quick-forming thunderstorm dumped a half-inch of rain in just 15 minutes, between 1:23-1:38 PM.

2021

It was hot and humid, with a high of 93° (the heat index reached 102°), the third day in a row with a high in the 90s.  Then a thunderstorm moved through late in the afternoon and produced enough rain in Central Park (0.67”, almost all of which fell between 5:15-5:45 PM) to bring August’s rainfall over ten inches.  This was after July had 11.09" of rain, making July-August just the second time consecutive months had 10 inches or more of rain.  (The other time, March-April 1983, has been disputed because the rain gauge in CPK was broken for a good portion of the year).  Just before the skies opened up, the dew point rose to 77°, which was the highest of the summer.  Interestingly, no rain fell in my Greenwich Village neighborhood (just thunder), which is about three miles south of Central Park (while LaGuardia Airport reported twice as much rain as the Park).

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July 2016 Weather Recap - A Month in the Tropics

Rain drops The1990sAs we entered the last week of July it appeared the month's headline story would be about the heat, which took hold in the second half of the month.  But when three one-inch rainstorms occurred in the last week, the month's storyline became the combination of heat and rain.  A hot July is usually on the dry side (with rainfall about 30% below average), while a rainy July is cooler than average (by one or two degrees).  July 2016, however, was an anomaly in that it was the 21st wettest and 22nd hottest (going back to 1870). 

 

WELCOME RAINFALL

The 7.02" of rain measured in Central Park made July the rainiest month since April 2014.  It was also the wettest July since 2009.  Additionally, the month's rainfall was more than what fell in the previous twelve weeks (since April 10).  Finally, only one July has been hotter and wetter than this July - July 1988, which had 8.14" of rain and was 2.7 degrees hotter than average (see chart at bottom of page).  In addition to the three one-inch rainfalls at the end of the month, a rainstorm that began the night of July 4th (after the Macy's fireworks exhibition had ended) and lasted through the next morning also delivered more than an inch.  And while this rain helped reduce the year's rain deficit (which was also an issue last year), it was still four inches below average at the end of the month (13% below average).

 

HOT, BUT DON'T BELIEVE THE HYPE

The month began with three days in a row with highs in the pleasant 70s, the first time since July 1960 that the month started this way.  Then from July 14-30 the average high/low was 90/73, 4.5 degrees above average.  And fifteen days between July 6-29 had highs of 88° or hotter.  Additionally, eight days had lows of 75° or warmer, with the warmest being 80°.

 

Nyc policeman cools off

 

After having no 90-degree days in June, July had ten (the average is eight), with seven occurring in an eight-day span from 7/21-28.  The one day that didn't reach 90° had a high of 89°.  If the temperature had reached 90° on that day (as it did at Newark and LaGuardia Airports) we  would have had an eight-day heat wave, which would have been the longest since 2002.)  The hottest day of the month was July 23, with a high/low of 96/80, eleven degrees above average.  However, July 25, with a high of 93°, felt hotter because it was much more humid and the heat index reached 102° (the feel-like temperature on the 23rd was actually 94° because of low humidity.) 

And while the second half of the month was hot and sultry, it was over-hyped by the media and some meteorologists, who put a sinister spin on the term "heat dome", leaning heavily on the global warming angle.  (I was interviewed on TV about the heat wave and I played it down as nothing extraordinary, especially compared to truly brutal heat waves of the past.)

 

Heat dome

 

CLOUD-COVER CURIOSITY

Despite all of the rain, the month was very sunny.  On the National Weather Servce's scale of cloud-cover, where zero is clear skies and ten is overcast, the month averaged a 2.8, with 19 days having clear or sunny days (a rating of zero to 2).  However, what's peculiar is that Newark and LaGuardia were much cloudier (6.3), but hotter.  JFK Airport also had a 6.3 but with slightly lower temperatures than Central Park.  Is this reality or is there a difference in the way Central Park scales cloud cover?  It seems counter intuitive that Newark and LGA, with so much cloud cover, would have 15 and 16 90-degree days, respectively, while sunny Central Park had "just" 10 hot days.  Another peculiarity is the fact that Central Park reported no thunderstorms in July but JFK and Newark had seven and LGA four.  Working in Midtown Manhattan, I heard thunder and saw lightning during a number of storms so I'm baffled by this.

 

Cloud Cover in July 2016  

Finally, despite how warm the month was (2.2 degrees above average), four other Julys since 2010 were hotter:  2015, 2013, 2011 and 2010.  And although July of last year was 0.1 degree hotter, this July had twice as many days in the 90s.

 

Hot Wet July

 

 

 

 

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