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E PA/NJ/DE fall general OBS and Discussion thread


The Iceman

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.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...

705 PM ESTF:

 

we will cancel another portion of the watch extreme ne md through

n de and sw NJ, however, thats it. we expect svr potential to

increase in waa toward 11 PM on the Delmarva. Please do not think

watch cancellation means its all clear all night. Its only all

clear through about midnight

 

Active through Noon Friday. FF potential continues fairly high and

the watch continues. Greatest concern is se PA, S NJ, ne MD,

central and northern DE, where it rained heard this afternoon, and

or where 3 hrly ffg is under 3".

 

svr wx threat is mainly delmarva and s tip of NJ through midnight

and then it may expand northward after midnight to near ILG- ACY

axis as low pres in northern VA cuts enewd through s NJ. tor parameter

remarkably large toward 09z on the sref in snj. so SVA 418 was

trimmed south.

 

LSR`s and PNS will be updated during the night.

 

we can use all damage reports, as well as unusual flooding reports

and any rainfall over 2 inches.

 

PWAT increase to 2.3" by 09z philly area. If it thunders at that

time, short term rainfall could easily be excessive for urban

areas.

 

normally heaviest rainfall occurs near the path of the sfc low,

near the most unstable air south of the south-ne wind sfc

convergence zone. Am expecting modeled qpf to be too far north.

 

 

so, another round of heavy rain looks to move in late tonight as

a wave of low pressure tracks northeastward along the stalled

front. Heavy rainfall with this second round may be more

widespread. Also, backed flow in the low levels ahead of the low

may provide a source of low- level helicity. Given very low LCL

heights, a weak tornado or two may occur toward early morning near

the front as long as instability remains near surface based.

 

630 PM ZFP wording on the Delmarva is somewhat confuded due to

svr wording terminating at midnight and gusty wind wording after

midnight but it doesnt read the second part of heavy rain and

gusty wind as Late.

 

&&

 

.SHORT TERM /6 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/...

Precipitable water values of 2.2 to 2.4 inches will overspread

our forecast area from the south for tonight. Conditions are

expected to remain unstable, especially across our southern

counties. Also, surface low pressure approaching from the west

will result in the development of a favorable low level wind

profile for organized convection tonight. The surface wind should

begin to favor the east to south quadrant late tonight, especially

on the coastal plain, while winds around 800 HPa will be from the

southwest.

 

The very high precipitable water values should result in heavy

rainfall in any organized convection. As a result, the Flash Flood

Watch remains in effect for southeastern Pennsylvania, central and

southern New Jersey, Delaware and northeastern Maryland.

 

The cloud cover and high humidity will keep temperatures from

falling below the 70s for tonight except in the Poconos and far

northern New Jersey.

 

AFD says activity will pick back up after midnight with hinting at issuing a watch...Maybe a tornado watch?

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Wow had fully expected periods of heavy rain long before now and radar continues to look like garbage. New dry slot coming in too, it's all up to the tail end wave of moisture that is coming through at 3am to keep this from a drought buster fail.

*0z NAM cut totals 2" north of Philly. If it was winter I just went from 30" snow to 10" lol

 

 

 

 

 

 

 

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2 hours ago, RedSky said:

Had my doubts ten days ago verse earlier thinking but the month did indeed finish wetter. Current radar has a rain forest look for today have to think the drought is ending. 

5.05" imby for July with more coming today and tomorrow. 

 

Congrats on a wet July, at last.  Hope also that NE PA is doing better.  I remember that a lot of it was in drought this spring.

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11 minutes ago, stemwinder said:

Have been under the backbuilding tail end of that cell, with 5" of rain on my little deck.  Not official, but definitely WET.

Moderate rain is slowly diminishing.  

 

I overlook the D&R Canal between W Windsor and Princeton, near Alexander Road.

 

Just heard on the news upwards of 5" in/around Princeton so you're probably correct.

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Looks like today could be another day of heavy rains with localized flooding especially during the afternoon and evening hours. Not sure what my total rainfall was yesterday but when I checked during the evening I was a little over 0.50". Probably wound up with between 0.50"-0.75" of rain for the day, not as much as some other areas received.

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