Alert archive / New York / Flash Flood Watches in 2009

Flash Flood Watch 7, NWS New York, NY

August 13, 20098 counties in New York; Hudson County, Passaic County, New Jersey

NWS New York, NY issued this flash flood watch at Aug 13, 2009, 4:35 AM EDT for 8 counties in New York; Hudson County, Passaic County, New Jersey. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Aug 13, 2009, 4:35 AM EDT (08:35 UTC)
Expired: Aug 13, 2009, 2:10 PM EDT
In force: 10 hr
Issued by: NWS New York, NY
Flood severity: None

Counties Hudson County, NJ, Passaic County, NJ, Bronx County, NY, Kings County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Richmond County, NY, Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 98 km from the middle of the area, began a volume at 08:39 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 8.6 hours before the alert went out and 98 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 136 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 544 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New York, NY wrote its last area forecast discussion before this flash flood watch went out at Aug 13, 2:25 AM EDT, 2 hours 10 minutes earlier.

Area forecast discussion, Aug 13, 2:25 AM EDT, 2 hours 10 minutes before

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In the hours before

Local storm report, Aug 12, 10:38 PM EDT, 5 hours 57 minutes before

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Local storm report, Aug 12, 10:47 PM EDT, 5 hours 48 minutes before

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Local storm report, Aug 12, 11:19 PM EDT, 5 hours 16 minutes before

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The office that day

Everything else NWS New York, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 8:03 PM EDT	Flash Flood Warning	OKX	Putnam	67 min
Aug 12, 10:31 PM EDT	Areal Flood Advisory	OKX	Suffolk	89 min
Aug 13, 1:07 AM EDT	Areal Flood Advisory	OKX	Orange	113 min
Aug 13, 4:09 AM EDT	Small Craft Advisory	OKX		11 hr
Aug 13, 5:45 AM EDT	Areal Flood Advisory	OKX	Putnam	90 min
Aug 12, 8:01 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Passaic	119 min
Aug 12, 8:38 PM EDT	Flash Flood Warning	OKX	Essex	3 hr

Nearby

Flash Flood Watches in New York, 2009 Flash Flood Watches in New Jersey, 2009 Every flash flood watch in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.