Alert archive / New York / Flash Flood Watches in 2009

Flash Flood Watch 5, NWS New York, NY

July 29, 20098 counties in New York; Hudson County, Passaic County, New Jersey

NWS New York, NY issued this flash flood watch at Jul 29, 2009, 4:21 AM EDT for 8 counties in New York; Hudson County, Passaic County, New Jersey. It took effect at Jul 29, 2009, 2:00 PM EDT. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Jul 29, 2009, 4:21 AM EDT (08:21 UTC)
In effect from: Jul 29, 2009, 2:00 PM EDT
Expired: Jul 30, 2009, 3:52 AM EDT
In force: 14 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 08:22 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

Albany, NY (KALY), launched 00:00Z, 8.4 hours before the alert went out and 192 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: 482 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1529 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 29, 2:03 AM EDT, 2 hours 18 minutes earlier.

Area forecast discussion, Jul 29, 2:03 AM EDT, 2 hours 18 minutes before

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Hazardous weather outlook, Jul 28, 5:55 PM EDT, 10 hours 26 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, 1:35 PM EDT	Areal Flood Advisory	OKX	Orange, Putnam, Rockland, Westchester	115 min
Jul 29, 1:49 PM EDT	Severe Thunderstorm Warning	OKX	Putnam, Rockland, Westchester	30 min
Jul 29, 2:35 PM EDT	Areal Flood Advisory	OKX	Orange	115 min
Jul 29, 2:38 PM EDT	Severe Thunderstorm Warning	OKX	Kings, New York, Queens, Richmond	37 min
Jul 29, 2:39 PM EDT	Special Marine Warning	OKX		36 min
Jul 29, 2:39 PM EDT	Severe Thunderstorm Warning	OKX	Orange	57 min
Jul 29, 2:55 PM EDT	Flash Flood Warning	OKX	Bronx, Kings, New York, Queens, Richmond	2 hr
Jul 29, 2:58 PM EDT	Tornado Warning	OKX	Orange	30 min
Jul 29, 6:17 PM EDT	Special Marine Warning	OKX		28 min
Jul 29, 6:23 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, New York, Queens, Richmond, Westchester	4 hr
Jul 29, 6:42 PM EDT	Areal Flood Advisory	OKX	Orange	2 hr
Jul 29, 6:45 PM EDT	Special Marine Warning	OKX		44 min
Jul 29, 6:49 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, Kings, New York, Queens	29 min
Jul 29, 7:38 PM EDT	Special Marine Warning	OKX		82 min
Jul 29, 7:58 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, Kings, Nassau, Queens, Suffolk	47 min
Jul 29, 12:54 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Essex, Passaic	66 min
Jul 29, 1:43 PM EDT	Areal Flood Advisory	OKX	Essex, Hudson, Union	92 min
Jul 29, 1:48 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Essex, Hudson, Passaic, Union	57 min
Jul 29, 1:53 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Hudson, Passaic, Union	2 hr
Jul 29, 2:46 PM EDT	Severe Thunderstorm Warning	OKX	Essex, Hudson, Union	29 min
Jul 29, 5:01 PM EDT	Flash Flood Warning	OKX	Bergen, Hudson	119 min
Jul 29, 5:59 PM EDT	Flash Flood Warning	OKX	Essex, Passaic, Union	3 hr
Jul 29, 7:06 PM EDT	Flash Flood Warning	OKX	Bergen, Hudson	114 min

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.