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May 2011 NYC metro area obs./discussion


Snowlover11

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For NW NJ yes but not really for Middlesex or the shore areas. My gut tells me we stay dry through the weekend, at least from NE NJ on north and eastward.

Going down to my shore house outside of AC tonight through Tuesday where there is a much better chance of staying completely dry so I won't care.

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SPC is likely going to issue a tornado watch over Central PA and Upstate NY soon:

http://www.spc.noaa.gov/products/md/md0979.html

MESOSCALE DISCUSSION 0979 NWS STORM PREDICTION CENTER NORMAN OK 1055 AM CDT THU MAY 26 2011 AREAS AFFECTED...CNTRL PA INTO UPSTATE NY CONCERNING...SEVERE POTENTIAL...WATCH LIKELY VALID 261555Z - 261730Z STRONG BOUNDARY LAYER HEATING IS OCCURRING OVER MUCH OF PA AND NY WELL AHEAD OF PRIMARY FORCING ASSOCIATED WITH UPPER TROUGH OVER THE OH VALLEY. IN THE ABSENCE OF SIGNIFICANT CLOUD COVER IT APPEARS VERY STEEP LOW LEVEL LAPSE RATES WILL SOON CONTRIBUTE TO DEEP BOUNDARY LAYER THERMALS AND WITH TIME A MATURING CU FIELD THAT SHOULD LEAD TO SCATTERED THUNDERSTORM DEVELOPMENT...ESPECIALLY OVER THE HIGHER TERRAIN FROM CNTRL PA INTO UPSTATE NY. ADDITIONALLY...DEEP LAYER SHEAR PROFILES FAVOR SUPERCELL DEVELOPMENT AND LOW LEVEL MOISTURE IS SUCH THAT ISOLATED TORNADOES MAY ACCOMPANY THE MORE ORGANIZED CELLS. VERY LARGE HAIL MAY ALSO BE NOTED GIVEN THE INSTABILITY OBSERVED. THIS ENVIRONMENT IS BECOMING INCREASINGLY FAVORABLE FOR SEVERE DEVELOPMENT AND A TORNADO WATCH MAY BE ISSUED BY 18Z. ..DARROW.. 05/26/2011

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Just wow, CAPE is at 4500 J/KGE southwest of Philly.

sbcp.gif?1306430768281

I hope when the cold front comes in next week and ends the warm strech weather and I hope there is a shot of thunderstorms and no dry cold fronts. I can't stand when there is dry cold fronts and then behind long stretch of dry weather.

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The severe paramaters are so intense right now, especially over sothern PA. I think there is hope that we could get lucky and get initiation from outflow boundries. None of the high res models have anything over PA until after dinner time. We shall see. This wouldn't be the first time we got some suprise severe weather. NJ and upstate have the best shots.

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Visible satalite imagery shows a distinct narrow line of cumulus building over NE PA which will probably miss most of us to the north, except mabye Sussex and Orange counties.

Another area of cumulus is building to the southwest of Philly. Keeing my fingers crossed.

It's showing up on infrared now

5L.jpg?1306431967781

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Tornado Watch incoming.....looks like it doesn't include anyone from NY metro at first glance

724

WWUS30 KWNS 261814

SAW2

SPC AWW 261814

WW 382 TORNADO NY PA 261820Z - 270200Z

AXIS..85 STATUTE MILES EAST AND WEST OF LINE..

40NW GFL/GLENS FALLS NY/ - 20S BGM/BINGHAMTON NY/

..AVIATION COORDS.. 75NM E/W /62NNW ALB - 31WSW HNK/

HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.

MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24030.

LAT...LON 43727248 41907433 41907762 43727588

THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A

COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS

FOR WOU2.

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Regarding the severe threat next week, I know it's early in the game, but I'm actually pretty impressed with the signal, and I'm not excited too often for T-storm threats in the Northeast.

However, here's a map Nate (zucker) posted last night of an infamous outbreak in the NE:

20h2ec0.jpg

Note the deep low tracking through southern Quebec and the associated pressure falls.

Below is the D7 12Z GFS valid Wednesday afternoon:

gfs_pcp_156s.gif

You have a fairly similar set-up -- deep low to the north of Maine and trailing strong cold front. Looks like an intense thermal gradient as well, 850s of +5 to 10c behind the front with high temps in the 60s/70s. We'll probably be soupy and around 90/70 mid next week.

Again, it's just somehting to monitor at this stage, but what we see progged for mid next week is certainly favorable for strong convection in the Northeast. Sfc lows of 1004-1008mb or stronger coupled with the antecedent airmass having 65-70F TD's and 85-90 ambient temps are among the signals you'd like to see. This low is well under 1000mb, quite powerful for the beginning of June, but we'll see if that remains consistent. Also note the position of the upper ridge and wind flow pattern -- marine layer should not be a major factor atm w/ this threat as SWLY winds are present.

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There is very little chance for any convection in the area today--and by very little I mean virtually none save for a widely isolated storm along a magical seabreeze boundary that has enough convergence to pop an updraft. The mid level height field is awful for getting convection here from the west--the heights are rising tonight as the southeast ridge flex's. Nice thermodynamics though on display really for the first time this year.

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There is very little chance for any convection in the area today--and by very little I mean virtually none save for a widely isolated storm along a magical seabreeze boundary that has enough convergence to pop an updraft. The mid level height field is awful for getting convection here from the west--the heights are rising tonight as the southeast ridge flex's. Nice thermodynamics though on display really for the first time this year.

Agree strongly, I think our threat to watch is mid next week to break the heat spell.

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