Alert archive / New York / Flash Flood Warnings in 2018

Flash Flood Warning 21, NWS New York, NY

August 11, 2018Greater Bridgeport Planning Region, Connecticut; 6 counties in New York; Bergen County, Hudson County, New Jersey

NWS New York, NY issued this flash flood warning at Aug 11, 2018, 8:14 AM EDT for Greater Bridgeport Planning Region, Connecticut; 6 counties in New York; Bergen County, Hudson County, New Jersey. It was in force for 109 min. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 11, 2018, 8:14 AM EDT (12:14 UTC)
Expired: Aug 11, 2018, 10:03 AM EDT
In force: 109 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Greater Bridgeport Planning Region, CT, Bergen County, NJ, Hudson County, NJ, Bronx County, NY, Kings County, NY, New York County, NY, Queens County, NY, Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 71 km from the middle of the area, began a volume at 12:17 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.

What was reported inside it

Time	Report	Where	Remark
Aug 11, 8:28 AM EDT	FLASH FLOOD	Manhattan, NY	FLOODING ON THE FDR EXPRESSWAY. WATER UP TO CAR BOTTOMS.
Aug 11, 8:50 AM EDT	FLASH FLOOD	Edgewater, NJ	CARS STRANDED ON RIVER RD IN EDGEWATER DUE TO FLASH FLOODING.
Aug 11, 8:51 AM EDT	FLASH FLOOD	Jersey City, NJ	MANHOLE COVERS BEING PUSHED UP CAUSING FLASH FLOODING ON DANFORTH AVE.
Aug 11, 9:00 AM EDT	FLASH FLOOD	Hoboken, NJ	SEVERAL ROADS FLOODED AROUND CITY. SOME IMPASSABLE.
Aug 11, 9:30 AM EDT	FLASH FLOOD	Queens, NY	WATER RESCUE AT INTERSECTION OF ROCKAWAY BLVD AND BROOKVILLE BLVD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 0.2 hours before the alert went out and 71 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: 840 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 590 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

875 
WGUS51 KOKX 111214
FFWOKX
CTC001-NJC003-017-NYC005-047-061-081-087-119-111415-
/O.NEW.KOKX.FF.W.0021.180811T1214Z-180811T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
814 AM EDT SAT AUG 11 2018

The National Weather Service in Upton NY has issued a

* Flash Flood Warning for...
  Southern Fairfield County in southern Connecticut...
  Hudson County in northeastern New Jersey...
  Eastern Bergen County in northeastern New Jersey...
  Westchester County in southeastern New York...
  Queens County in southeastern New York...
  Bronx County in southeastern New York...
  Kings County in southeastern New York...
  Rockland County in southeastern New York...
  New York (Manhattan) County in southeastern New York...

* Until 1015 AM EDT.

* At 814 AM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly.

* Some locations that will experience flooding include...
  Jersey City, Jamaica, Yonkers, Stamford, Norwalk, New Rochelle,
  Flushing, Bayonne, White Plains, Mott Haven, Hoboken, East Tremont,
  Hackensack, New City and Port Chester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 4131 7399 4135 7372 4117 7328 4111 7327
      4110 7334 4108 7335 4104 7342 4105 7344
      4101 7352 4100 7365 4094 7368 4091 7375
      4084 7376 4083 7380 4076 7371 4067 7373
      4066 7403 4068 7406 4066 7406 4066 7412

$$

NV

1 follow-up statement

574 
WGUS71 KOKX 111403
FFSOKX

Flash Flood Statement
National Weather Service New York NY
1003 AM EDT SAT AUG 11 2018

CTC001-NJC003-017-NYC005-047-061-081-087-119-111412-
/O.CAN.KOKX.FF.W.0021.000000T0000Z-180811T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fairfield CT-Hudson NJ-Bergen NJ-Westchester NY-Queens NY-Bronx NY-
Kings NY-Rockland NY-New York (Manhattan) NY-
1003 AM EDT SAT AUG 11 2018

...THE FLASH FLOOD WARNING FOR SOUTHERN FAIRFIELD...HUDSON...EASTERN
BERGEN...WESTCHESTER...QUEENS...BRONX...KINGS...ROCKLAND AND NEW YORK
(MANHATTAN) COUNTIES IS CANCELLED...

The heavy rain has ended. While flooding is no longer expected to 
pose a threat, additional rainfall is expected today. Please 
continue to heed any remaining road closures.

LAT...LON 4131 7399 4135 7372 4117 7328 4111 7327
      4110 7334 4108 7335 4104 7342 4105 7344
      4101 7352 4100 7365 4094 7368 4091 7375
      4084 7376 4083 7380 4076 7371 4067 7373
      4066 7403 4068 7406 4066 7406 4066 7412

$$

MD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 3:27 AM EDT	Coastal Flood Statement	OKX	Naugatuck Valley Planning Region	22 hr
Aug 11, 3:27 AM EDT	Coastal Flood Advisory	OKX	Greater Bridgeport Planning Region	22 hr
Aug 11, 5:40 AM EDT	Areal Flood Advisory	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	67 min
Aug 11, 7:40 AM EDT	Areal Flood Advisory	OKX	Greater Bridgeport Planning Region	99 min
Aug 11, 4:39 PM EDT	Areal Flood Advisory	OKX	Greater Bridgeport Planning Region	3 hr
Aug 11, 4:50 PM EDT	Coastal Flood Statement	OKX	Naugatuck Valley Planning Region	33 hr
Aug 11, 4:50 PM EDT	Coastal Flood Advisory	OKX	Greater Bridgeport Planning Region	33 hr
Aug 11, 3:27 AM EDT	Coastal Flood Statement	OKX	Kings, Richmond	19 hr
Aug 11, 4:06 AM EDT	Areal Flood Advisory	OKX	Suffolk	3 hr
Aug 11, 4:12 AM EDT	Special Weather Statement	OKX	Suffolk	63 min
Aug 11, 4:20 AM EDT	Flash Flood Warning	OKX	Suffolk	3 hr
Aug 11, 4:52 AM EDT	Special Weather Statement	OKX	Suffolk	53 min
Aug 11, 4:56 AM EDT	Severe Thunderstorm Warning	OKX	Suffolk	49 min
Aug 11, 4:57 AM EDT	Special Marine Warning	OKX		45 min
Aug 11, 5:28 AM EDT	Special Weather Statement	OKX	Suffolk	62 min
Aug 11, 5:38 AM EDT	Areal Flood Advisory	OKX	Suffolk	97 min
Aug 11, 7:21 AM EDT	Special Weather Statement	OKX	Richmond	39 min
Aug 11, 7:30 AM EDT	Areal Flood Advisory	OKX	Kings, New York, Richmond	90 min
Aug 11, 7:45 AM EDT	Special Marine Warning	OKX		45 min
Aug 11, 7:59 AM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens, Westchester	91 min
Aug 11, 8:09 AM EDT	Special Weather Statement	OKX	Bronx, Kings, Nassau, New York, Queens	36 min
Aug 11, 8:18 AM EDT	Special Marine Warning	OKX		87 min
Aug 11, 8:23 AM EDT	Severe Thunderstorm Warning	OKX	Bronx, Kings, Nassau, New York, Queens, Westchester	52 min
Aug 11, 8:39 AM EDT	Special Weather Statement	OKX	Westchester	51 min
Aug 11, 8:59 AM EDT	Special Marine Warning	OKX		61 min
Aug 11, 9:03 AM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	87 min
Aug 11, 9:15 AM EDT	Special Weather Statement	OKX	Nassau	60 min
Aug 11, 9:49 AM EDT	Areal Flood Advisory	OKX	Suffolk	116 min
Aug 11, 6:11 PM EDT	Areal Flood Advisory	OKX	Bronx, New York, Queens	40 min
Aug 11, 6:41 AM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Passaic, Union	2 hr
Aug 11, 6:52 AM EDT	Special Weather Statement	OKX	Essex, Union	53 min
Aug 11, 7:10 AM EDT	Flash Flood Warning	OKX	Bergen, Essex, Hudson, Passaic, Union	2 hr
Aug 11, 2:57 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Passaic, Union	2 hr
Aug 11, 3:57 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Passaic	2 hr
Aug 11, 5:30 PM EDT	Flash Flood Warning	OKX	Bergen	2 hr
Aug 11, 5:50 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Passaic	85 min
Aug 11, 6:02 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Passaic	118 min
Aug 11, 7:55 PM EDT	Areal Flood Advisory	OKX	Essex	3 hr

Nearby

Flash Flood Warnings in New York, 2018 Flash Flood Warnings in New Jersey, 2018 Flash Flood Warnings in Connecticut, 2018 Every flash flood warning in 2018

Sources

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