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September 2018 Discussions & Observations Thread


Rtd208

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7 minutes ago, Brian5671 said:

He didn't say 10 degrees. Your post said mid 20's...and he's saying that there have been numerous storms with snow with colder temps than 25.     You are correct, many storms are b/w 25-33 however to say that it's exceedingly rare to see a snowstorm at less than 25 is not accurate...there are plenty of examples over the last 30-40 yrs.

Yes. We have had many events in fhe 20-24 range. Blizzard of 1996 was in the teens

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13 minutes ago, Brian5671 said:

He didn't say 10 degrees. Your post said mid 20's...and he's saying that there have been numerous storms with snow with colder temps than 25.     You are correct, many storms are b/w 25-33 however to say that it's exceedingly rare to see a snowstorm at less than 25 is not accurate...there are plenty of examples over the last 30-40 yrs.

His post said 10 degrees with heavy snow, which is why I responded in the first place, I was genuinely curious, it wasn’t an “Oh you’re wrong”-type of response. I said I was unsure if I’d ever seen heavy snow below 25 degrees, lower 20’s probably would’ve made more sense.

I never said it was exceedingly rare, only that it isn’t the norm, and wasn’t anything I’d noticed.

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Even though the current ENSO warming is much weaker than 2015, we are getting a similar 500 mb atmospheric response. Notice the big ridge near the Aleutians, Western Trough, and amplified WAR. This is producing the record warm and humid August in September pattern. 

September 2015 pattern

IMG_0236.PNG.a3083bdc082499947328387ab20dd1cb.PNG

 

 Current 500 mb pattern and forecast

 

ecmwf-ens_z500aMean_namer_1.thumb.png.db137f9bb3cb10715a47efe789d05ea6.png

ecmwf-ens_z500aMean_namer_6.thumb.png.5fca8f3a004a614c0de5437f9bbaf099.png

 

 

 

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26 minutes ago, CIK62 said:

There was significant snow during early daylight hours of Sunday, Jan.20, 1985, in Brooklyn at least,  on strong NW winds and 11degs.    It cleared and we set a -2deg. record Monday morning.

Thanks. I didn’t know this was possible in our neck our the woods. Also, it’s interesting to know the conditions leading up to one of the coldest nights in history.

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20 minutes ago, Cfa said:

His post said 10 degrees with heavy snow, which is why I responded in the first place, I was genuinely curious, it wasn’t an “Oh you’re wrong”-type of response. I said I was unsure if I’d ever seen heavy snow below 25 degrees, lower 20’s probably would’ve made more sense.

I never said it was exceedingly rare, only that it isn’t the norm, and wasn’t anything I’d noticed.

One of my favorite heavy snow events was 32" at 12-14* in November 1994. Granted it wasn't here, or even near here, but it was absolutely amazing. That was on top of 14" the night before and in the middle of a 400" over 60 days stretch. I love the west slope of the Tetons :) 

1 minute ago, Cfa said:
  26 minutes ago, CIK62 said:

"There was significant snow during early daylight hours of Sunday, Jan.20, 1985, in Brooklyn at least,  on strong NW winds and 11degs.    It cleared and we set a -2deg. record Monday morning."

Thanks. I didn’t know this was possible in our neck of the woods.

I remember this period pretty well. We had some crazy cold on LI and up in VT where I went to college it was outrageously cold. I remember seeing temps of -30 up there and daytime temps in the -20's. On Friday nights I took my car battery inside because I had to be at work 30 miles away at 7am and couldn't risk the car not starting.

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This morning saw additional record high minimum temperatures approached, tied, and broken across the New York City and surrounding region.

Preliminary Record High Minimum Temperatures for September 4:

Atlantic City: 75° (old record: 74°, 1953 and 1970)
Bridgeport: 73° (tied record set in 1973 and tied in 2011)
Islip: 74° (old record: 72°, 1970)
New Haven: 72° (tied record set in 2011)
New York City-JFK: 77° (old record: 73°, 1959 and 1985)
New York City-LGA: 80° (old record: 77°, 1953) **would be the latest 80° minimum temperature for any NYC area station should it hold**
Newark: 78° (old record: 75°, 1953 and 1973)
Richmond: 75° (tied record set in 2012)
Washington, DC: 79° (old record: 76°, 1953 and 2012)
White Plains: 72° (tied record set in 1953 and tied in 1985)

Boston had a low temperature of 80°. Were that reading to hold, Boston would further extend its record of the latest 80° minimum temperature on record, which was established on August 29. However, the guidance forecasts that the temperature in Boston will very likely fall into the 70s late this evening.

Through September 4, New York City has had no sub-60° minimum temperatures. Since 1869, only 17 prior years reached this point without having had at least one low temperature in the 50s during the period beginning on July 1. 9 of those cases occurred 1990 and afterward, including 5 from 2010 and afterward.

 

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New York City (NYC) Daily Snowfalls of 3” or More with a Daily High Temperature < 20°

December 26, 1872: 18.0” (High: 12°)
January 18, 1875: 5.0” (High: 18°)
December 29, 1880: 4.0” (High: 10°)
January 10, 1883: 5.0” (High: 14°)
March 13, 1888: 3.0” (High: 12°)
January 12, 1893: 5.0” (High: 18°)
January 1, 1899: 3.0” (High: 18°)
January 12, 1912: 3.5” (High: 19°)
February 25, 1934: 3.7” (High: 16°)
January 24, 1948: 3.2” (High: 18°)
January 20, 1961: 5.5” (High: 19°)
January 16, 1965: 4.6” (High: 17°)
February 7, 1967: 12.5” (High: 16°)
February 16, 2003: 3.5” (High: 15°)
January 15, 2004: 3.2” (High: 18°)
January 3, 2014: 3.3” (High: 18°)

 

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some of the coldest big snowstorms in NYC history...

year.....LE.....snow.....

1996....2.16".....20.2" Jan...

2003....1.78".....19.8" Feb...

2010....1.61".....20.0" Dec...

1983....1.49".....17.6" Feb...

2005....1.18".....13.8" Jan...

1978....1.13".....17.7" Feb...

1879....1.12".....13.0" Jan...

1960....1.08".....14.5" Mar...

1967....1.06".....12.5" Feb...

1876....1.04".....11.0" Feb...

1933....1.04".....11.2" Dec...

1935....0.99".....13.0" Jan...

1926....0.96".....12.0" Feb...

1964....0.88".....12.5" Jan...

1960....0.86".....15.2" Dec...

1899....0.70".....16.0" Feb...

1905....0.51".....11.0" Jan...

1961....0.50"......9.9" Jan...

2014....0.48".....11.5" Jan...

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45 minutes ago, uncle W said:

some of the coldest big snowstorms in NYC history...

Our last big snowstorm/blizzard with record cold was way back in April 1982. It was also the last time that NYC had 3 consecutive record lows.

4/6 21 in 1982 23 in 1881 24 in 1887
4/7 21 in 1982 23 in 1881 24 in 1943
4/8 25 in 1982 26 in 1972 28 in 1920+
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1 hour ago, bluewave said:

Our last big snowstorm/blizzard with record cold was way back in April 1982. It was also the last time that NYC had 3 consecutive record lows.

4/6 21 in 1982 23 in 1881 24 in 1887
4/7 21 in 1982 23 in 1881 24 in 1943
4/8 25 in 1982 26 in 1972 28 in 1920+

The high of 30 the day after the storm was more amazing...then it snowed again a few a few days later...

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Select Record High Daily Temperatures for September 4 (through 12:00 pm):

Atlantic City: 92° (tied record set in 1964 and tied in 1985 and 2008)
New Haven: 89° (old record: 87°, 1959)
Westhampton: 86° (old record: 84°, 1959, 1967, 2007, and 2015)

In addition, Washington, DC had a temperature of 94°. That was 1° short of that city’s daily record of 95°, which was set in 1985 and tied in 2008.

 

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33 minutes ago, TriPol said:

Is August any kind of canary in the coal mine for how snowy the upcoming winter will be?

Not really, though there may be a slight tendency to favor more snowfall (30" or more). The two warmest August cases followed by an El Niño winter (1950-2017) were winters 2002-03 (49.3") and 2015-16 (32.8").

Here are the statistics for New York City:

August (1950-2017):
August mean temperature: 75.6°

Mean seasonal snowfall: 26.6”
Median seasonal snowfall: 23.8”
% cases < 10” seasonal snowfall: 7.4%
% cases < 20” seasonal snowfall: 42.6%
% cases  30” or more seasonal snowfall: 32.4%
% cases 40” or more seasonal snowfall: 23.5%
% cases 50” or more seasonal snowfall: 13.2%

Cases: 68


30 Warmest August Cases (1950-2017):

Mean seasonal snowfall: 29.1”
Median seasonal snowfall: 25.5”
% cases < 10” seasonal snowfall: 6.7%
% cases < 20” seasonal snowfall: 33.3%
% cases  30” or more seasonal snowfall: 40.0%
% cases 40” or more seasonal snowfall: 23.3%
% cases 50” or more seasonal snowfall: 13.3%

Cases: 30


August with Mean Temperature 1.5° or more above the 1950-2017 average:

Mean seasonal snowfall: 30.2”
Median seasonal snowfall: 32.3”
% cases < 10” seasonal snowfall: 2.9%
% cases < 20” seasonal snowfall: 7.4%
% cases  30” or more seasonal snowfall: 52.9%
% cases 40” or more seasonal snowfall: 29.4%
% cases 50” or more seasonal snowfall: 17.6%

Cases: 17 (could be skewed by the sample size)

 

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Yesterday had trouble holding 80degs. at this time.   Today it has been 86+ for hours already.   Wind more northerly today.

GFS still dabbling with the 90's on last day of summer!

I hated returning to school during heatwaves, or ending the term with them.    No A/C in my public school here in Brooklyn{during my time there---this was true for many families at home too), just those huge turbine floor fans that flapped your hair and made it hard to hear the teacher.

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