Alert archive / New York / Flash Flood Watches in 2009

Flash Flood Watch 6, NWS New York, NY

July 30, 20099 counties in New York; 4 counties in Connecticut; Hudson County, Passaic County, New Jersey

NWS New York, NY issued this flash flood watch at Jul 30, 2009, 3:50 PM EDT for 9 counties in New York; 4 counties in Connecticut; Hudson County, Passaic County, New Jersey. It took effect at Jul 31, 2009, 8:00 AM EDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Jul 30, 2009, 3:50 PM EDT (19:50 UTC)
In effect from: Jul 31, 2009, 8:00 AM EDT
Expired: Jul 31, 2009, 6:33 PM EDT
In force: 11 hr
Issued by: NWS New York, NY
Flood severity: None

Counties Greater Bridgeport Planning Region, CT, Lower Connecticut River Valley Planning Region, CT, Naugatuck Valley Planning Region, CT, Southeastern Connecticut Planning Region, CT, 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, Suffolk County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 66 km from the middle of the area, began a volume at 19:49 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.8 hours before the alert went out and 279 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 933 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 30, 1:38 PM EDT, 2 hours 12 minutes earlier.

Area forecast discussion, Jul 30, 1:38 PM EDT, 2 hours 12 minutes before

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Hazardous weather outlook, Jul 30, 5:31 AM EDT, 10 hours 19 minutes before

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In the hours before

Local storm report, Jul 30, 2:08 PM EDT, 1 hour 42 minutes before

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Local storm report, Jul 30, 2:09 PM EDT, 1 hour 41 minutes before

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Local storm report, Jul 30, 3:50 PM EDT, 0 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
Jul 29, 8:37 PM EDT	Areal Flood Advisory	OKX	Orange	113 min
Jul 29, 8:37 PM EDT	Special Marine Warning	OKX		38 min
Jul 29, 10:16 PM EDT	Flash Flood Warning	OKX	Orange	3 hr
Jul 30, 3:46 AM EDT	Small Craft Advisory for Hazardous Seas	OKX		12 hr
Jul 30, 3:50 PM EDT	Small Craft Advisory	OKX		12 hr
Jul 30, 5:35 PM EDT	Coastal Flood Statement	OKX	Kings, Suffolk	27 hr

Nearby

Flash Flood Watches in New York, 2009 Flash Flood Watches in Connecticut, 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.