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The Last Days Of Summer: September 2015 DISCUSSION/OBS


UnionWeatherWx

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late October 1982 there was a noreaster with almost 2" of rain in NYC...At the time I thought it was a good sign for the winter...February had a similar storm with cold air to work with and we know how that worked out...1972 was the opposite with a very wet fall...

 

 

Relative to departures, we have been one of the driest parts of the US since April 1st.

We went from cold and snowy Jan-Mar to warm and dry since April.

 

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late October 1982 there was a noreaster with almost 2" of rain in NYC...At the time I thought it was a good sign for the winter...February had a similar storm with cold air to work with and we know how that worked out...1972 was the opposite with a very wet fall...

Right now, I'm not too worried about late fall or winter. I fully expect a vigorous subtropical jet to develop with opportunities for some significant precipitation events. There could be some risk of suppression, though. A lot will depend on whether blocking develops and the positioning of such blocking. I remain hopeful that the NYC area will avoid a 1972-73-type outcome with almost no snowfall.

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Right now, I'm not too worried about late fall or winter. I fully expect a vigorous subtropical jet to develop with opportunities for some significant precipitation events. There could be some risk of suppression, though. A lot will depend on whether blocking develops and the positioning of such blocking. I remain hopeful that the NYC area will avoid a 1972-73-type outcome with almost no snowfall.

I hope this year is not like 1972-73...it had very little help from the ao nao because when they went negative it helped keep any storms at the time suppressed to the south...that was a year when everything went wrong...1997-98 was milder and hardly any cold air was available..I think it was worse than 72-73...I too believe the winter won't end up like those but you can't rule that kind of winter out at this time of the year...

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If one looks at the GFS ensemble 500 mb anomalies forecast for early next week, the pattern is again reasonably similar to some very warm late-September patterns (see #795 in this thread for the maps: http://www.americanwx.com/bb/index.php/topic/46784-the-last-days-of-summer-september-2015-discussionobs/?p=3681945).

 

GFSensemble0923201512z.jpg

 

Considering the forecast pattern, whether or not tomorrow reaches 80° (and I believe it will), I expect that next week could see one or more additional 80° or above readings. Moreover, the unseasonable warmth could generally persist into at least the first week in October with some chance of at least another 80° or above temperature.

 

Finally, through today, the lowest temperature at Central Park this month has been 59°. September 1910 had the warmest minimum temperature on record for Central Park with a reading of 57°.

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In looking at the possible cloud cover at the time of the lunar eclipse (Sunday evening starting I think low (altitude 16deg) in the eastern sky at about 8PM and  mid-totaityl about 10:30PM (at about an altitude of 45deg. in southeastern sky) then ending at about 1AM here in NYC---GFS shows border line sky conditions of approx. 50% total cloud coverage but both completely clear skies and completely obscured skies are not far away from us---so maybe we could get lucky.

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+6.6 at NYC through the 24th with more 80 degree potential next week after today.

July 17th was the last time NYC had a daily departure lower than -1.This may be

a first for NYC from mid July into late September.

 

Warmest Septembers in NYC

#1..... +5.5

#10... +3.1

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Through September 23rd, NYC is tracking very close to 2010 for the warmest May-September

on record. The last week of the month will determine how close 2015 gets to the top.

The previous big 4 years were 2010, 1991, 1980, and 1944.

 

updated through 2014

 

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I see a lot of the models are now showing rain for sunday afternoon and night. GGEM shows a nice steady soaking rain. Do you guys buy it? Boy do I hope we see some rain. The 0.75" of rain I got earlier in the month was the only significant rain I've seen in the last couple months. It's ridiculously dry out there. 

there's a thread for this.  GGEM is a wet outlier and Euro the furthest south.   NAM coming in now showing precip having a hard time moving north through Sat night.

 

http://www.americanwx.com/bb/index.php/topic/46921-927-92815-big-surf-high-astronomical-tides/page-3

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Maybe a few showers at best. It's been a while since I've seen it this dry. So much dead vegetation and burnt out lawns.

Warm month made it a lot worse than it would've been otherwise.

only thing making it less worse is the decreasing sun angle.   But it's bone dry around here, 3rd fall in a row.   '13 went dry through Thanksgiving, last year got wet in early October and this year the verdict is out but looks dry through 10/2 or so at least.

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