Alert archive / New York / Flash Flood Watches in 2009

Flash Flood Watch 4, NWS New York, NY

July 26, 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 26, 2009, 4:35 AM EDT for 9 counties in New York; 4 counties in Connecticut; Hudson County, Passaic County, New Jersey. It took effect at Jul 26, 2009, 12:00 PM EDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jul 26, 2009, 4:35 AM EDT (08:35 UTC)
In effect from: Jul 26, 2009, 12:00 PM EDT
Expired: Jul 26, 2009, 11:34 PM EDT
In force: 12 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 08:37 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, 8.6 hours before the alert went out and 179 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: 220 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.9

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 26, 2:51 AM EDT, 1 hour 44 minutes earlier.

Area forecast discussion, Jul 26, 2:51 AM EDT, 1 hour 44 minutes before

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Hazardous weather outlook, Jul 26, 4:27 AM EDT, 8 minutes before

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In the hours before

Special weather statement, Jul 26, 12:59 AM EDT, 3 hours 36 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1259 AM EDT SUN JUL 26 2009

NYZ067-068-260530-
ORANGE-PUTNAM-
1259 AM EDT SUN JUL 26 2009

...STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN ORANGE AND PUTNAM
COUNTIES...

AT 1257 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR NEW WINDSOR...OR NEAR NEWBURGH...AND
MOVING NORTHEAST AT 20 MPH.

THIS STORM WILL BE...
  NEAR NEWBURGH BY 105 AM.

SMALL HAIL...AND GUSTY WINDS UP TO 50 MPH ARE EXPECTED WITH THIS
STORM. IN ADDITION...VERY HEAVY RAIN IS OCCURRING WITH THIS STORM.

LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE
TO SAFE SHELTER IMMEDIATELY.

JMC

Local storm report, Jul 26, 1:47 AM EDT, 2 hours 48 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 25, 11:04 PM EDT	Areal Flood Advisory	OKX	Orange	86 min
Jul 25, 11:47 PM EDT	Flash Flood Warning	OKX	Orange	118 min
Jul 26, 3:24 PM EDT	Special Marine Warning	OKX		36 min
Jul 26, 4:05 PM EDT	Special Marine Warning	OKX		55 min
Jul 26, 4:17 PM EDT	Severe Thunderstorm Warning	OKX	Kings, Nassau, Queens	43 min
Jul 26, 4:27 PM EDT	Special Marine Warning	OKX		44 min
Jul 26, 4:57 PM EDT	Special Marine Warning	OKX		66 min
Jul 26, 5:08 PM EDT	Severe Thunderstorm Warning	OKX	Kings, Nassau, Queens	45 min
Jul 26, 5:30 PM EDT	Special Marine Warning	OKX		31 min
Jul 26, 5:51 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Rockland	39 min
Jul 26, 5:52 PM EDT	Areal Flood Advisory	OKX	Rockland, Westchester	113 min
Jul 26, 5:59 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond	2 hr
Jul 26, 6:14 PM EDT	Flash Flood Warning	OKX	New York	49 min
Jul 26, 6:20 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, Kings, New York, Queens, Westchester	40 min
Jul 26, 6:24 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Rockland, Westchester	51 min
Jul 26, 6:25 PM EDT	Special Marine Warning	OKX		65 min
Jul 26, 6:45 PM EDT	Tornado Warning	OKX	Nassau, Queens	30 min
Jul 26, 6:55 PM EDT	Severe Thunderstorm Warning	OKX	Nassau, Suffolk	50 min
Jul 26, 6:59 PM EDT	Special Marine Warning	OKX		91 min
Jul 26, 7:39 PM EDT	Flash Flood Warning	OKX	Kings, Queens	2 hr
Jul 26, 6:34 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region	11 min
Jul 26, 6:41 PM EDT	Tornado Warning	OKX	Greater Bridgeport Planning Region	16 min
Jul 26, 5:24 PM EDT	Severe Thunderstorm Warning	OKX	Essex, Union	66 min
Jul 26, 5:58 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Hudson, Passaic	32 min
Jul 26, 6:26 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Hudson	34 min

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.