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Heavy Rain and Flooding April 29 - May 1 Observation Thread


IsentropicLift

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if KNYC gets 5" from this storm it would be in the top ten wettest events...

Here are the wettest days on record...

8.28" on 9/23/1882. 11.83" from 9/21-23.

7.56" on 4/15/2007. 8.45" from 4/15-16

7.40" on 11/8/1977. 9.19" from 11/7-8.

7.33" on 10/9/1903. 11.80" from 10/8-10.

5.81" on 8/14/2011

5.60" on 11/8/1972.

5.54" on 9/21/1966.

5.02" on 9/16/1999.

4.98" on 10/1/1913.

4.97" on 4/30/2014

Wettest storms

11.83" 09/21-23/1882

11.80" 10/08-10/1903

..9.19" 11/07-08/1977

..8.45" 04/15-16/2007

..7.76" 09/13-14/1944

..7.01" 10/12-13/2005

..6.87" 08/27-28/2011

..6.32" 08/12-13/1955

.....................................

KNYC has around 5.10" so far from this event...more showers today will add to the totals...

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Very solid rain event for all, came in pretty much as predicted: 3-5" of rain for all except Suffolk County, which was always expected to get the lighter end of the rain totals. Nassau County had 4-5" of rain it seems, which sounds right since the rain was coming down in buckets for a time last night. It still paled in comparison though to other rain events we had, such as the remnants of Andrea (6" of rain mostly in a few hours in Long Beach) last June or the August 2011 rain event before Irene (10" of rain in a few hours). Luckily we don't have heat coming in behind all this rain, or the humidity would be unbearable.

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Got some pretty terrible news this morning from the town and now I can see it for myself. The Wanaque reservoir has exceeded its Maximum level and is now flowing over the dam and into the Wanaque river downstream. This will continuously feed the entire river system downstream including the Ramapo, Pompton and eventually Passaic rivers.  While this won't cause water levels to dramatically rise it will pro long the currently ongoing minor flooding as well as keep water levels abnormally high for the foreseeable future making the area more vulnerable to future flooding.

wrdn4_hg.png

 

wnqn4_hg.png

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4.51" in the town over from me (Lido Beach) so I guess that's what I'll go with. Nassau County looks like one of the jackpot spots with 4 to almost 6" of rain.

There was a PWS over Mineola, NY that record 6.36":

 

http://www.wrh.noaa.gov/mesowest/getobext.php?sid=E4708

 

Upton also showed dual pol amounts 6"+ over parts of Queens and Nassau:

 

http://ow.ly/i/5qilq/original

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