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August 2014


Rtd208

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Central Park is running only -0.27 below normal in terms of temperatures for the June 1st-August 20th period, ever so slightly below normal. Next week should be predominately warmer than normal, particularly mid/late weeks with overnight lows uppers 60s/low 70s and some days 85-90F potentially.

 

If NYC finishes August at -1, the summer JJA will end up -0.1, which is just barely below normal.

 

While 90 degree days have been certainly lacking in an impressive fashion, when we're talking about forecast verification, discussing the magnitude of cold/warm in a particular season, departures/anomalies are the most relevant in my opinion. 90 degree days are one variable of discussion. It would be akin to focusing on the number of nights below 20F in NYC during the winter, and saying it's been a warm winter if we have few nights < 20F. Departures capture the entire picture of nights and days. Daytime highs could have been predominately cold while nights are milder due to cloud cover.

 

This summer will go down as a near normal one in terms of temp departures. As someone noted earlier, the persistent onshore flow (complete absence of NWLY flow furnace days) yielded elevated minima yet also moderate high temps.

 

2009 was a much cooler summer than this year when we talk departures. The real cool this summer was confined to the Mid-west/Great Lakes.

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2009's warmest 30 day period was 76.8...2014 is 76.7...2009 had more 90+ days also...

 

 

 

When we compare the entire June 1st-August 19th period of 2009 to June 1st-August 19th of 2014, the summer of 2009 was significantly colder than 2014 to date for the Northeastern US.

 

The Northeast as a whole is running close to average in 2014 versus -0.5 to -1 K below normal in 2009.

 

 

The maxima warmth has been cooler this summer but the departures on the negative side have been much fewer and of lesser magnitude.

 

20u8mps.gif

 

 

a0ucd2.gif

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Although the negative departures were more impressive during the summer of 2009, the 

lack of heat waves this summer is more impressive. 2009 was only missing a 

heat wave in June and July. This summer is heat wave free at LGA for June, July, and

August. 2009 could only sustain the lack of heat for two months before the warmth

in August. This summer the lack of heat waves is for all three summer months at LGA

 

LGA stats for both summers:

 

June 2009....-3.2 high 85..no heat wave

June 2014....+0.3 high 88..no heat wave

 

July 2009....-2.6 high 89...no heat wave

July 2014....-0.5 high 93...no heat wave..(2) 90 degree days in a row...total 90 degree days (3)

 

August 2009...+1.8...high 94 heat wave...(4) 90 degree days in a row..total 90 degree days (7)

August 2014...-1.9...high 89 no heat wave

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this summer was one of the better summers in recent years...It was just warm enough and we had many sunny days...The lack of 90 degree days made it seem cool...The hottest month or 30 day period averaged 76.6 from late June to late July...last year's hottest 30 days was 81.7 which is the 5th hottest on record...Since 1930 the average hottest 30 day period is 78.0...1980 holds the record with a very warm 30 days averaging 82.5...The coolest year was 2000...It's hottest 30 days was 72.7...tied with 1888 for the lowest on record...with four days 90 or higher it puts 2014 in 3rd place for the least amount of 90 degree days for the year(since 1930)...1960 had five with four coming from 8/27-9/1...we still could get over 90 again before it's over...

Years with the warmest and coolest 30 days...

year...ave...since 1930

82.5 in 1980

81.9 in 1999/1876

81.8 in 2005

81.7 in 2013

81.6 in 1955

..............................

72.7 in 2000/1888

74.4 in 1992

74.8 in 2004

74.9 in 1996

75.0 in 1960/1950

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It'll be nearly a month for most sites but next week looks to include potential 90 (+) readings as the any cutoff or systems undercutting the ridge /eastern flow eases and we experience the full benefit of the ridge that should have otherwise been delivering the warmth since 8/18, but has reather seen undercutting systems and an east flow buckle back into thea area.  8/5 - 8/31 looks above normal (overall) but not enough to erase the -2(+) departures this august.  Likely we'll fall close to within a degree of the mean this month

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this summer was one of the better summers in recent years...It was just warm enough and we had many sunny days...The lack of 90 degree days made it seem cool...The hottest month or 30 day period averaged 76.6 from late June to late July...last year's hottest 30 days was 81.7 which is the 5th hottest on record...Since 1930 the average hottest 30 day period is 78.0...1980 holds the record with a very warm 30 days averaging 82.5...The coolest year was 2000...It's hottest 30 days was 72.7...tied with 1888 for the lowest on record...with four days 90 or higher it puts 2014 in 3rd place for the least amount of 90 degree days for the year(since 1930)...1960 had five with four coming from 8/27-9/1...we still could get over 90 again before it's over...

Years with the warmest and coolest 30 days...

year...ave...since 1930

82.5 in 1980

81.9 in 1999/1876

81.8 in 2005

81.7 in 2013

81.6 in 1955

..............................

72.7 in 2000/1888

74.4 in 1992

74.8 in 2004

74.9 in 1996

75.0 in 1960/1950

 

Great stats unc, once the ridging that developed couldn't deliver warmth this week and easterly flow produced cooler departures, the month was lost to cool and likely will bring the seasonal below normal as well.  It does seem like the persistent pattern has been tilted in the last week as we see guidance favoring higher heights into the east into September and any troughing/front more transient before ridging returns.  With that can we dare say 8/25 - 9/7 is a 2 week warm period?  Maybe, but not with out hesitation.

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Not bad... Now 66 degrees here after a brief shower.

 

Never cleared much here as well p- seemed to skip CNJ and SI area after working into NE-NJ and S-CNJ yesterday.  Pretty ugly day but what a difference 24 little hours make.  Mainly sunny here and temps  upto 80 here already,

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With the first 3 plus weeks of August done the cool anomalies are strong.  We'll see how the coming warmup factors in over the next week.  8/24 - 8/31 should see overall positive departures of 3 - 6 degrees which will likely bring places close to a degree of normal.  The period should also include the next shot at widespread 90(+) degree readings Wed/thu (8/27 - 28) and perhaps again by 8/30. 

 

 

NYC: -1.6

EWR:  -2.1

LGA:  -2.1

JFK:  -1.3

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For the warmest spots probably but this months so called heat has been pathetic when all you get is 1 90 degree day maybe.

 

IThe ridging did arrive and develop  (for the second half od August) as modeled in early august but the heat as later modeled was going to be delayed due to undercutting of the ridge and an easterly flow.  Overall, the period 8/18 - early September should still be on the warm side and we'll see how much heat can develop.  Going for stronger heat is recent dryness but the seasonal trend certainly does argue against it.  But the pattern has seemed to shift to one that favors ridging into the east and only transient troughs followed by higher heights returning back.   

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