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Record Late December Warmth Today


bluewave

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The 5z HRRR has highs 70-71 over NYC today. And 71-74F over CNJ. But even it shows temps in the 50s now in NYC.

The nam and the hrrr are starting to show a possible low topped squall for tom.

- The nam also shows a cool down Monday night from about 50 to 25 in about 4 hours that would be pretty cool to watch.

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If this were the 1980's, you would be right, things have changed over the last 30 years, and especially the last 25 years.

Its just cool to see, it has been so cold this whole year up here. I was only able to use my pool for 3 weeks this year, lol maybe I can open it for the day tomorrow.

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RECORD EVENT REPORT
NATIONAL WEATHER SERVICE NEW YORK NY
0717 AM EST SUN DEC 22 2013

...RECORD HIGH TEMPERATURE SET AT CENTRAL PARK NY...

A RECORD HIGH TEMPERATURE OF 68 DEGREES WAS SET AT CENTRAL PARK NY
TODAY. THIS BREAKS THE OLD RECORD OF 63 SET IN 1998. THE TEMPERATURE
COULD RISE MORE...AND ADDITIONAL RECORD REPORTS WOULD FOLLOW.


 
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Yea Concrete tends to do that lol, that's why record lows are so much more impressive in cities.

So where are all the record low maximums that shouldn't be affected by UHI? It's in the upper 60s at 7am area wide at the end of December and there's no sun to aid that temp. Where's my equivalent of a 40 degrees below normal for an afternoon high temp with full sunshine?

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At the same time, the US as a whole is having one of its coldest Decembers in recent history. Parts of Montana and North Dakota averaged -25F anomaly for an entire week this month. Also, while 850s here and elsewhere ahead of the front are 12-14C above normal, the 850s behind the front in the Plains are as much as 20C below average.

So where are all the record low maximums that shouldn't be affected by UHI? It's in the upper 60s at 7am area wide at the end of December and there's no sun to aid that temp. Where's my equivalent of a 40 degrees below normal for an afternoon high temp with full sunshine?

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Core of the 60kt+ LLJ and 16C+ 850mb temps moving through early this morning. So were going to miss out on the max potential with the temps and winds. We still have have 12-13C 850mb temps and 40-50kt LLJ around 18z. So we still can break 70 and see some wind gusts between 30-40mph, early this afternoon. Depending on how much sunshine we get.

 

The 4km WRF and HRRR show winds switching more WSW/SW around 18z. So the warmth should spread further east later.

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At the same time, the US as a whole is having one of its coldest Decembers in recent history. Parts of Montana and North Dakota averaged -25F anomaly for an entire week this month. Also, while 850s here and elsewhere ahead of the front are 12-14C above normal, the 850s behind the front in the Plains are as much as 20C below average.

16c is more like 20c above average. the july normal at okx is 15c
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At 7am the 850mb. surface temp. was reported at 16.8C over NYC, shattering the 15.0C for this time frame.   The NAM had a ridiculous theoretical high of 85 for this PM on the Skew-T!   On June 22, with the longer daylight  and stronger sun, the column of air over NYC as shown probably would produce the low 80's.  This extra 1.8C would seem to give a 3-4 degree F boost to the current records at this frame, ie. a new record of 73-74 potentially.

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