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March 10 - March 11 Redux Event


tornadojay

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Thanks,it looks like the Euro closes off the H5 low sooner so it tracks it surface low further west.

yup, exactly. Just like the ggem, the trough goes neg faster so everything gets pushed west. Dont know if its right tho, the last event shifted east the day before so who knows.

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You guys think this is the type of set up where with watch most of the rain fall to the west of us on thursday?

Guidance continues to project the heaviest rains will be west of NYC but suspect we;re looking at an area-wide soaker with 2 - 4 inch amounts.

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FLOOD WATCH

NATIONAL WEATHER SERVICE NEW YORK NY

421 PM EST TUE MAR 8 2011

...ANOTHER ROUND OF HEAVY RAINFALL HEADED THIS WAY...

.A DEVELOPING STORM SYSTEM OVER THE MISSISSIPPI VALLEY WILL TRACK

SLOWLY EAST THE NEXT SEVERAL DAYS...BRINGING A POTENTIAL FOR

ADDITIONAL HEAVY RAINFALL FROM THURSDAY INTO EARLY FRIDAY. THIS

WILL EXACERBATE THE HIGH WATER LEVELS ACROSS AREA RIVERS AND

STREAMS.

CTZ005-006-009-010-NJZ002-004-006-103>108-NYZ067>071-091000-

/O.NEW.KOKX.FA.A.0004.110310T1500Z-110311T1500Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

NORTHERN FAIRFIELD-NORTHERN NEW HAVEN-SOUTHERN FAIRFIELD-

SOUTHERN NEW HAVEN-WESTERN PASSAIC-EASTERN PASSAIC-HUDSON-

WESTERN BERGEN-EASTERN BERGEN-WESTERN ESSEX-EASTERN ESSEX-

WESTERN UNION-EASTERN UNION-ORANGE-PUTNAM-ROCKLAND-

NORTHERN WESTCHESTER-SOUTHERN WESTCHESTER-

421 PM EST TUE MAR 8 2011

...FLOOD WATCH IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY

MORNING...

THE NATIONAL WEATHER SERVICE IN UPTON HAS ISSUED A

* FLOOD WATCH FOR PORTIONS OF SOUTHERN CONNECTICUT...NORTHEAST

NEW JERSEY AND SOUTHEAST NEW YORK...INCLUDING THE FOLLOWING

AREAS...IN SOUTHERN CONNECTICUT...NORTHERN FAIRFIELD...

NORTHERN NEW HAVEN...SOUTHERN FAIRFIELD AND SOUTHERN NEW

HAVEN. IN NORTHEAST NEW JERSEY...EASTERN BERGEN...EASTERN

ESSEX...EASTERN PASSAIC...EASTERN UNION...HUDSON...WESTERN

BERGEN...WESTERN ESSEX...WESTERN PASSAIC AND WESTERN UNION. IN

SOUTHEAST NEW YORK...NORTHERN WESTCHESTER...ORANGE...PUTNAM...

ROCKLAND AND SOUTHERN WESTCHESTER.

* FROM THURSDAY MORNING THROUGH FRIDAY MORNING

* RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE THURSDAY INTO

EARLY FRIDAY.

* DUE TO THE RECENT HEAVY RAINFALL...MANY RIVERS AND STREAMS ARE

AT HIGH LEVELS. THIS COMBINED WITH SATURATED SOIL WILL RESULT IN

HIGH RUNOFF RATES WITH THE POTENTIAL FOR MODERATE TO MAJOR

FLOODING. THIS IS A POTENTIALLY DANGEROUS SITUATION.

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18Z GFS has gone back to a less progressive solution. Either way, the final solution is not much different in terms of total QPF from the rest of the pack. Generally 1.50" and less from the city on eastward. 1.50"-2.00" for the immediate western burbs. A large area of 2.0-3.0" totals from basically west of the GS Parkway into PA. NW NJ and NE PA are JP zone with 3.00" +. The totals are actually very close to Upton's forecast.

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No matter how you cut or slice it, a 2-4" rainfall is likely for the NYC metro area, there are still going to be some variations on the models on where the heaviest rain amounts will be. Urban, stream, and river flooding is looking like a major concern now.

18Z GFS has gone back to a less progressive solution. Either way, the final solution is not much different in terms of total QPF from the rest of the pack. Generally 1.50" and less from the city on eastward. 1.50"-2.00" for the immediate western burbs. A large area of 2.0-3.0" totals from basically west of the GS Parkway into PA. NW NJ and NE PA are JP zone with 3.00" +. The totals are actually very close to Upton's forecast.

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No matter how you cut or slice it, a 2-4" rainfall is likely for the NYC metro area, there are still going to be some variations on the models on where the heaviest rain amounts will be. Urban, stream, and river flooding is looking like a major concern now.

I agree with those totals. This is shaping up to be trouble for those same areas that were flooded last year. Hopefully we can get into a warmer and drier pattern beyond this Thursday.

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I can only speak for my river, but last March, we hit #2 all time after the Noreaster which gave as ~ 4" of rain. The main culprit was not only because of the heavy amounts of rain but also because of runoff from snowmelt in the higher terrain. OEM told us beforehand they estimated that the snowpack was still holding ~9 of water in areas like West Milford and that the reservoirs were near full. Going into that event however, the Pompton river and most other parts of the Passaic river basin were near normal to slightly above normal levels. About ten days or so after that, we got another ~2.5" rainfall system and we hit moderate flood stage. The Passaic river took the brunt of that system.

T

lol.not even close to 9 inches of liquid lol. it was 3-4 inches 

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Those estimates were from OEM and forwarded by our Chief. Please don't give out info just based on your hunch or estimate when you have no clue what your talking about.

How could most places have had 9" of liquid in their snowpack? There wasn't even any snow on the ground here at 400' in Westchester before the 2/25 Snowicane; sure, that storm dumped like 3" liquid in many areas, some of which had previous snowpack, but 9" seems to be pushing it?

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Those estimates were from OEM and forwarded by our Chief. Please don't give out info just based on your hunch or estimate when you have no clue what your talking about.

Check out this modeled SWE product from NOHRSC from March 9 2010. If my eyes are reading the colors correctly, it shows widespread 2"-4" SWEs, with some localized areas of 4"-6". I think 9" is pushing it, but 3"-6" is nothing to scoff at, especially with the 4"-5"+ of rain that then fell with the mid-March storm!

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