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April 2017 Observations and Discussions


NJwx85

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2 hours ago, bluewave said:

April departures really taking off and should continue to climb with the next 80 degree warm up this weekend.

NYC...+4.2

LGA...+5.1

JFK....+2.8

ISP....+3.3

BDR...+3.9

EWR...+4.7

More and more proof that the 1981-2010 averages are useless for today's climate!

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Just now, SnoSki14 said:

We should probably stick with 15 year average intervals vs. 30 with how rapidly our climate is changing.

 

Just now, SnoSki14 said:

We should probably stick with 15 year average intervals vs. 30 with how rapidly our climate is changing.

Yes I think if we use 15 year averages we would have temps that are much more realistic for normal in today's climate. If we keep going like this it would be difficult to get anywhere near average snow for philly south in about 20 years.

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33 minutes ago, Snow88 said:

Sunday looks like a very warm day with temps in the low to mid 80s.

Looks like a top 5 warmest Easter.

Top 5 warmest Easters in NYC

1)...96...4-18-76

2)...86...4-22-62....4-22-73

3)...85...4-21-57

4)...83...4-9-1871

5)...80...4-24-11

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What "warm less spell" we've been doing nothing but torching and it looks to continue with the pacific firehose promoting more eastern ridging. 

Guarantee this April ends up being another top 10 warmest month. 



Beyond Sunday the models keep temperatures very close to normal. That should ultimately pull down departures. Won't come anywhere close to a +5 departure. Will be 2-3 above at most.


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the ao is forecast to be at its lowest level since October...whether it gets that low remains to be seen...The ao forecasts have been anything but good...If it does get that low we could be seeing some late April or early May freezes in the usual cold spots...

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58 minutes ago, Tekken_Guy said:

 


Beyond Sunday the models keep temperatures very close to normal. That should ultimately pull down departures. Won't come anywhere close to a +5 departure. Will be 2-3 above at most.


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We'll have to average near normal or slightly below from the 17th on for that to occur. We'll be around +6 past the halfway point. It will only take a couple warmups to keep the 2nd half above normal as well. I think we'll finish around +4 to +4.5 possibly higher.

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The worst Spring days are the cold damp ones after we had a real warm spell...Here are some of the worst days we had after the first warm spell...

4/25/1976...49 max...

4/25/1955...49 max...

4/26/1976...46 max...

4/26/1955...46 max...

4/29/1964...47 max...

5/02/1962...45 max...

5/09/1977...44 max with snow...

5/09/1972...49 max...

5/12/2010...48 max...

5/17/1915...52 max...

5/18/2002...55 max...

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2 hours ago, uncle W said:

The worst Spring days are the cold damp ones after we had a real warm spell...Here are some of the worst days we had after the first warm spell...

4/25/1976...49 max...

4/25/1955...49 max...

4/26/1976...46 max...

4/26/1955...46 max...

4/29/1964...47 max...

5/02/1962...45 max...

5/09/1977...44 max with snow...

5/09/1972...49 max...

5/12/2010...48 max...

5/17/1915...52 max...

5/18/2002...55 max...

4/12/2013? 4/16/2014? 4/30/2014? All those days from last year? They all have got to fit here.

Anyway. The latest models seem to all show the same thing. The "heatless spell" is looking far less likely from now, although there are still no signs of a repeat of the last two days beyond Easter. We'll have the Easter heat, a cooler but still warm follow-up day, and then two days of cool.

The models tend to diverge from 4/21 on. GFS is running cool, ECMWF and GEFS are going a bit above average with mostly upper 60s. So, yeah, my theory of "April will stay near average after Easter" is now in doubt.

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7 hours ago, Tekken_Guy said:

4/12/2013? 4/16/2014? 4/30/2014? All those days from last year? They all have got to fit here.

Anyway. The latest models seem to all show the same thing. The "heatless spell" is looking far less likely from now, although there are still no signs of a repeat of the last two days beyond Easter. We'll have the Easter heat, a cooler but still warm follow-up day, and then two days of cool.

The models tend to diverge from 4/21 on. GFS is running cool, ECMWF and GEFS are going a bit above average with mostly upper 60s. So, yeah, my theory of "April will stay near average after Easter" is now in doubt.

I was looking at years with some days 85 degrees or higher before it got cold again...I remember a cold day in May 1987 when I had to turn the heat back on in my house...1962 had a two days around 90 in late April and a few days later it was in the mid 40's during the day with drizzle...

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Top 5 warmest minimums this April so far for our local stations. The newly updated ISP data back to 1964 has this April with the warmest min so far. There is the potential for this to be only the 6th year since 64 at Islip without an April freeze. Those other years were some pretty hot summers.

Warmest April monthly mins for ISP

34...2017...2010..1988...

33...1999...1983

 

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Next 8 days jump to +9 (62 vs. 53).   Most of the days are just cloudy with a chance of showers however

+4.3 x 13 = +56.      + 9 x 8 = +72. or +128/21 = +6.1 by the 22.

If rest of month is then just normal, we would finish April @ +4.3.

 

 

 

 

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On 4/9/2017 at 8:47 AM, dmillz25 said:

Funny I was watching that game on YES yesterday the Matsui grand slam

I was too- great memories.  It was actually snowing a little bit during the later innings.  35 degrees game time temperature on the day after the snowfall!

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On 4/9/2017 at 7:25 AM, bluewave said:

First 80 or greater potential this week in the warmer parts of the area away from the ocean influence. This is very close to the current 15 year average for TTN-EWR corridor. Could see some stronger Ambrose Jet activity near the South Shore of Long Island with the big temperature differential.

15 year average first 80 dates around the area

TTN...4-8

EWR...4-9

NYC...4-18

LGA...4-20

JFK...4-30

BDR..5-4

ISP...5-4

 

Well at least we got our first 70 degree temp out here, who knows when we'll get our first 80- maybe Sunday?

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12 hours ago, uncle W said:

I was looking at years with some days 85 degrees or higher before it got cold again...I remember a cold day in May 1987 when I had to turn the heat back on in my house...1962 had a two days around 90 in late April and a few days later it was in the mid 40's during the day with drizzle...

1990 is a prime example, 85 in mid march then snow in early april.

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On 4/13/2017 at 10:39 AM, bluewave said:

Looks like a top 5 warmest Easter.

Top 5 warmest Easters in NYC

1)...96...4-18-76

2)...86...4-22-62....4-22-73

3)...85...4-21-57

4)...83...4-9-1871

5)...80...4-24-11

When was Easter in 2002 when we had that big April heatwave?

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On 4/12/2017 at 2:52 PM, psv88 said:

With SWFE's for example, many times the south shore changes over or mixes while the north shore stays all frozen right to the end of the storm. 

Jim from Long Beach will tell you his experiences with that...

The Snowicane i believe comes to mind as another example, where  the south shore mixed but LIE north stayed all snow and we dumped, got like 16" or some crazy amount. I believe it was the snowicane.

The difference between Commack and ISP and even FRG in marginal events is huge. Once you go even further north towards Caumsett its like a different climate altogether. 

 

Snowicane- you mean the late Feb 2010 storm right?  That was more of a west to east thing, where western areas changed over first.  JFK got 10-12" with that because they changed over to snow before Suffolk County did.

Also, it depends on when the SWFE occurs- if it occurs in December, the south shore changes over early on, if it happens in February we all stay mainly snow (like February 2008 which dumped 8 inches here.)

Snowicane wasn't an SWFE anyway it was a retrograding coastal storm.  SWFE are usually boring windless west to east type storms.

 

 

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On 4/12/2017 at 10:36 AM, bluewave said:

It's actually better down here during the summer since we get great seabreezes to take the edge off the heat. The only exception are the very hot offshore flow days when the seabreeze is cutoff.

I know you like your 100s too for their historical nature ;-)  We did hit the 70s here on Wednesday.  I hope we make it to 80 on Sunday.

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On 4/12/2017 at 11:09 AM, psv88 said:

Agree to disagree I guess. I had about 44" inches of snow this winter, about the same as Upton. South Shore areas got less.

It's also the LI sound effect. I think it was January blizzard this year where the north shore cashed in on a sound enhanced inverted trough, which didnt make it south of the LIE for the most part. The north shore from Bayside, Queens east often add to their totals due to this effect. 

In marginal events, which there were a few this winter, you were "snowing" but not sticking, while we had a snow covered roads. So its more complicated than the south shore areas staying all snow. For example, in the sleet storm, blizzard bust, i was sleeting for 2-3 hours below freezing after ISP had turned to rain already. 

That January storm was my favorite storm of the entire winter, we got around 11" here, and the February storm was about 10" Our two double digit storms here in SW Nassau County.

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On 4/12/2017 at 3:06 PM, bluewave said:

The Euro has a slightly slower frontal passage on Sunday with 80's again. With more of a WSW flow, parts of Long Island may see their first 80 of the year.

 

ecmwf_t2max_nyc_19.thumb.png.916d4cf54225eaa87f81c95280c62c93.png

 

 

 

 

80 possible for JFK on Sunday?  Great!

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5 minutes ago, IrishRob17 said:

Tuesday afternoon, about 2 miles south of KMGJ which hit 88 that afternoon.  

Wow, you must have the trees budding already.  I actually have some green showing up already on the lower branches of trees here.

Out of the LHV airports (POU, MGJ, SWF, DXR) was MGJ the warmest?

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12 hours ago, uncle W said:

I was looking at years with some days 85 degrees or higher before it got cold again...I remember a cold day in May 1987 when I had to turn the heat back on in my house...1962 had a two days around 90 in late April and a few days later it was in the mid 40's during the day with drizzle...

There was a day in the 60s in late May where LGA had ice pellets- had it again back in 2013.

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