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Heavy rain event 8/14-8/15 discussion/obs


ptb127

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The radar appearance is basically the worst case scenario. All the heavy stuff looks like it's headed right for the areas that have been getting pummeled (NYC and east). Won't be surprised with another 3"-6" of rain for NYC and vicinity.

Currently, heavy rain again in Astoria. Approaching 6" for sure now.

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The radar appearance is basically the worst case scenario. All the heavy stuff looks like it's headed right for the areas that have been getting pummeled (NYC and east). Won't be surprised with another 3"-6" of rain for NYC and vicinity.

Currently, heavy rain again in Astoria. Approaching 6" for sure now.

Ha no model predicted anything like this.

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The radar appearance is basically the worst case scenario. All the heavy stuff looks like it's headed right for the areas that have been getting pummeled (NYC and east). Won't be surprised with another 3"-6" of rain for NYC and vicinity.

Currently, heavy rain again in Astoria. Approaching 6" for sure now.

It looks to be pivoting slightly more northerly and move more towards northern NJ

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RA

68.1/68

2.62" total precipitation

Rainfall has not been extreme in Dobbs Ferry, but we're still heading towards a mess tonight for my delivery shift with the heaviest rains spreading into the area from the SW. I imagine we'll have a good chance of surpassing 6" when this event has wound down, just insane here.

Heh, expect this to happen in the winter too when we're getting 20" of snow and you're enjoying all your cold dry air ;)

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depending on the track of the main low..it is possible it may not stop raining in NYC for many hours..

The low (still west)seems to be moving ESE and a pivot point feature will occur somewhere..here the rain will stop sagging east and then turn north

the rain looks like it wants to end in western NJ but then more moves in/develops from the south

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Up to 4.01 inches here. Rain has tapered off now as the heavy stuff seems to be shifting to the east. Is another batch of rain expected tonight or is this mainly it?

I'm honestly surprised at how well the Raritan River has taken all of this rain. 4 inches of rain here and yet it's not even expected to get to action stage.

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Up to 4.01 inches here. Rain has tapered off now as the heavy stuff seems to be shifting to the east. Is another batch of rain expected tonight or is this mainly it?

Would like to know also....

Imagine if this starts to pivot and the heavy rains stay over NYC, Queens and Nassau for a few more hours? Rainfall totals would be unreal as if the 8" - 10" already fallen is not record breaking.

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AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE NEW YORK NY

354 PM EDT SUN AUG 14 2011

SYNOPSIS

LOW PRESSURE CROSSES THE MID ATLANTIC STATES TONIGHT...THEN TRACKS

NORTHEAST INTO THE GULF OF MAINE BY TUESDAY MORNING...THEN

TRACKING INTO THE CANADIAN MARITIME PROVINCES TUESDAY. HIGH

PRESSURE WILL MOVE EAST TOWARD THE AREA TUESDAY NIGHT THEN OFF THE

COAST EARLY THURSDAY. ANOTHER TROUGH OF LOW PRESSURE WILL MOVE

SLOWLY EAST TOWARD THE AREA LATE THURSDAY BEFORE PASSING EAST OF

THE AREA SATURDAY NIGHT.

NEAR TERM /UNTIL 6 AM MONDAY MORNING/

CUTOFF 850-500 HPA OVER NE OHIO AT 19Z...DRIFTS SE INTO NORTHERN

WVA/SW PA BY MONDAY MORNING. IN RESPONSE TO SHORTWAVES ROTATING

AROUND IT A SURFACE LOW DEVELOPING OVER NORTHERN VA AT

19Z...TRACKS TO OFF THE DELMARVA PENINSULA BY MONDAY MORNING.

GUIDANCE ALSO SUGGESTS COULD END UP IN ANOTHER COUPLED JET

STRUCTURE TONIGHT...LIKE LAST NIGHT...SO WITH CONTINUED SUB-

TROPICAL MOISTURE FEED...SOLID ISENTROPIC LIFT...AND IMPACT OF

SHORTWAVES...ANOTHER WET NIGHT...ON NET...IS ON TAP FOR THE TRI-

STATE.

IN THE IMMEDIATE NEAR TERM...THE QUESTION IS DOES FILLING DRY SLOT

OVER CENTRAL PA WORK INTO THE REGION THIS EVENING. WITH LOW LEVEL

UPSLOPE FLOW HAVE SOME DOUBTS...BUT DO THINK IT WILL HELP

CONSOLIDATE PRECIP MORE OVER THE NW PARTS THAN SE PARTS OF THE CWA

THIS EVENING...AS SUGGESTED BY ALL GUIDANCE IN RESPONSE TO

FORECAST LOW TO MID LEVEL FRONTOGENETIC FORCING. RAIN SHOULD THEN

OVERSPREAD THE REMAINDER OF THE CWA OVERNIGHT...AIDED BY

APPROACHING LOW LEVEL JET.

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