Alert archive / New York / Flash Flood Watches in 2021
Flash Flood Watch 4, NWS New York, NY
NWS New York, NY issued this flash flood watch at Jul 11, 2021, 4:24 PM EDT for 4 counties in Connecticut; 5 counties in New Jersey; 11 counties in New York. It took effect at Jul 12, 2021, 2:00 PM EDT. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Jul 11, 2021, 4:24 PM EDT (20:24 UTC)
- In effect from
- Jul 12, 2021, 2:00 PM EDT
- Expired
- Jul 13, 2021, 3:12 AM EDT
- In force
- 13 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, Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Passaic County, NJ, Union County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY
The radar
The Brookhaven radar (KOKX), 71 km from the middle of the area, began a volume at 20:25 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 12:00Z, 8.4 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.
- Mixed-layer CAPE
- 17 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 715 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
719 WGUS61 KOKX 112024 FFAOKX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service New York NY 424 PM EDT Sun Jul 11 2021 ...HEAVY RAIN AND FLASH FLOODING POSSIBLE MONDAY AFTERNOON INTO EARLY TUESDAY MORNING... CTZ005>012-NJZ002-004-006-103>108-NYZ067>075-078-080-176>179- 120930- /O.NEW.KOKX.FF.A.0004.210712T1800Z-210713T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Fairfield-Northern New Haven-Northern Middlesex- Northern New London-Southern Fairfield-Southern New Haven- Southern Middlesex-Southern New London-Western Passaic- Eastern Passaic-Hudson-Western Bergen-Eastern Bergen- Western Essex-Eastern Essex-Western Union-Eastern Union-Orange- Putnam-Rockland-Northern Westchester-Southern Westchester- New York (Manhattan)-Bronx-Richmond (Staten Island)- Kings (Brooklyn)-Northwest Suffolk-Southwest Suffolk- Northern Queens-Northern Nassau-Southern Queens-Southern Nassau- 424 PM EDT Sun Jul 11 2021 ...FLASH FLOOD WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... The National Weather Service in Upton has issued a * Flash Flood Watch for all of southern Connecticut and northeast New Jersey, and most of southeast New York, including the following areas, in southern Connecticut, Fairfield, New Haven, Middlesex, and New London counties. In northeast New Jersey, Bergen, Essex, Hudson, Passaic, and Union counties, In southeast New York, all five boroughs of New York City, Westchester, Orange, Putnam, Rockland, Nassau, and Western Suffolk counties. * From Monday afternoon through Tuesday morning. * As a warm front lifts into the area on Monday, scattered to numerous thunderstorms will develop Monday afternoon. As the front sinks back to the south Monday night, the front will continue to focus thunderstorm activity and heavy rain potential over the watch area, especially in and around the New York City Tri-State area. This rain will be falling in areas hard hit by heavy rain and flash flooding late last week. * Rainfall amounts of 2 to 3 inches are likely, with localized amounts over 4 inches possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should flash flood warnings be issued. && $$
4 follow-up statements
775 WGUS61 KOKX 120724 FFAOKX Flood Watch National Weather Service New York NY 324 AM EDT Mon Jul 12 2021 ...HEAVY RAIN AND FLASH FLOODING POSSIBLE THIS AFTERNOON INTO EARLY TUESDAY MORNING... CTZ005>012-NJZ002-004-006-103>108-NYZ067>075-078-080-176>179- 122200- /O.CON.KOKX.FF.A.0004.210712T1800Z-210713T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Fairfield-Northern New Haven-Northern Middlesex- Northern New London-Southern Fairfield-Southern New Haven- Southern Middlesex-Southern New London-Western Passaic- Eastern Passaic-Hudson-Western Bergen-Eastern Bergen- Western Essex-Eastern Essex-Western Union-Eastern Union-Orange- Putnam-Rockland-Northern Westchester-Southern Westchester- New York (Manhattan)-Bronx-Richmond (Staten Island)- Kings (Brooklyn)-Northwest Suffolk-Southwest Suffolk- Northern Queens-Northern Nassau-Southern Queens-Southern Nassau- 324 AM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH TUESDAY MORNING... The Flash Flood Watch continues for * Portions of southern Connecticut, northeast New Jersey, and southeast New York, including the following areas, in southern Connecticut, Fairfield, Middlesex, New Haven, and New London counties. In northeast New Jersey, Bergen, Essex, Passaic, Union, and Hudson counties. In southeast New York, all five boroughs of New York City, Nassau, Westchester, Orange, Putnam, Rockland, and Western Suffolk counties. * From 2 PM EDT this afternoon through Tuesday morning * Scattered to numerous thunderstorms are expected to develop this afternoon in the vicinity of a warm front. As this front sinks back to the south tonight it will continue to focus thunderstorm activity and heavy rain potential over the watch area, especially in and around the New York City Tri-State area. This rain will be falling in areas hard hit by heavy rain and flash flooding late last week. * Rainfall amounts of 1 to 3 inches are likely, with localized amounts over 4 inches possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should flash flood warnings be issued. && $$
983 WGUS61 KOKX 121745 FFAOKX Flood Watch National Weather Service New York NY 145 PM EDT Mon Jul 12 2021 ...HEAVY RAIN AND FLASH FLOODING POSSIBLE THIS AFTERNOON INTO EARLY TUESDAY MORNING... CTZ005>008-010>012-121845- /O.CAN.KOKX.FF.A.0004.210712T1800Z-210713T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Fairfield-Northern New Haven-Northern Middlesex- Northern New London-Southern New Haven-Southern Middlesex- Southern New London- 145 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch has been cancelled for most of southern Connecticut. Heavy rain and the threat of flash flooding are likely to remain to the south and west. $$ CTZ009-NJZ002-004-006-103>108-NYZ067>075-078-080-176>179-130645- /O.CON.KOKX.FF.A.0004.210712T1800Z-210713T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southern Fairfield-Western Passaic-Eastern Passaic-Hudson- Western Bergen-Eastern Bergen-Western Essex-Eastern Essex- Western Union-Eastern Union-Orange-Putnam-Rockland- Northern Westchester-Southern Westchester-New York (Manhattan)- Bronx-Richmond (Staten Island)-Kings (Brooklyn)-Northwest Suffolk- Southwest Suffolk-Northern Queens-Northern Nassau-Southern Queens- Southern Nassau- 145 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY MORNING... The Flash Flood Watch continues for * All of northeast New Jersey, most of Southeast New York, and a small portion of southern Connecticut, including the following areas. In northeast New Jersey, Bergen, Essex, Hudson, Passaic, and Union counties. In southeast New York, all five boroughs of New York City, and Nassau, Western Suffolk, Westchester, Rockland, Orange, and Putnam counties. In southern Connecticut, Southern Fairfield county. * Through Tuesday morning. * Scattered to numerous showers and thunderstorms are expected to develop this afternoon near a frontal boundary over or just south of the watch area. The front will continue to focus shower and thunderstorm over the watch area tonight, especially in and around the New York City Tri-State area. This rain will be falling in areas hard hit by heavy rain and flash flooding late last week. * Rainfall amounts of 1 to 3 inches are likely, with localized amounts over 4 inches possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should flash flood warnings be issued. && $$
174 WGUS61 KOKX 130627 FFAOKX Flood Watch National Weather Service New York NY 227 AM EDT Tue Jul 13 2021 ...HEAVY RAIN AND FLASH FLOODING POSSIBLE THROUGH EARLY THIS MORNING... CTZ009-NJZ002-004-006-103>108-NYZ067>075-078-080-176>179-131400- /O.CON.KOKX.FF.A.0004.000000T0000Z-210713T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southern Fairfield-Western Passaic-Eastern Passaic-Hudson- Western Bergen-Eastern Bergen-Western Essex-Eastern Essex- Western Union-Eastern Union-Orange-Putnam-Rockland- Northern Westchester-Southern Westchester-New York (Manhattan)- Bronx-Richmond (Staten Island)-Kings (Brooklyn)-Northwest Suffolk- Southwest Suffolk-Northern Queens-Northern Nassau-Southern Queens- Southern Nassau- 227 AM EDT Tue Jul 13 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 AM EDT THIS MORNING... The Flash Flood Watch continues for * Portions of southern Connecticut, northeast New Jersey, and southeast New York, including the following areas, in southern Connecticut, Southern Fairfield County. In northeast New Jersey, Bergen, Essex, Passaic, Union, and Hudson Counties. In southeast New York, Bronx, Kings (Brooklyn), New York (Manhattan), Queens, Richmond (Staten Island), Nassau, Westchester, Orange, Putnam, Rockland, and Western Suffolk Counties. * Until 10 AM EDT this morning * Scattered showers and thunderstorms continue to develop southwest of the region and track towards the area. This rain may fall across areas with abnormally wet antecedent conditions due to heavy rain and flash flooding late last week. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should flash flood warnings be issued. && $$
864 WGUS61 KOKX 130712 FFAOKX Flood Watch National Weather Service New York NY 312 AM EDT Tue Jul 13 2021 CTZ009-NJZ002-004-006-103>108-NYZ067>075-078-080-176>179-130815- /O.CAN.KOKX.FF.A.0004.000000T0000Z-210713T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southern Fairfield-Western Passaic-Eastern Passaic-Hudson- Western Bergen-Eastern Bergen-Western Essex-Eastern Essex- Western Union-Eastern Union-Orange-Putnam-Rockland- Northern Westchester-Southern Westchester-New York (Manhattan)- Bronx-Richmond (Staten Island)-Kings (Brooklyn)-Northwest Suffolk- Southwest Suffolk-Northern Queens-Northern Nassau-Southern Queens- Southern Nassau- 312 AM EDT Tue Jul 13 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of southern Connecticut, northeast New Jersey, and southeast New York has been cancelled. Additional showers will continue to move across the area early this morning, but rainfall intensity has decreased significantly and flash flooding is no longer a concern. $$
The office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 8:19 PM EDT | Areal Flood Advisory | OKX | Bergen, Hudson | 64 min |
| Jul 10, 8:54 PM EDT | Areal Flood Advisory | OKX | Essex, Hudson | 53 min |
| Jul 10, 8:50 PM EDT | Areal Flood Advisory | OKX | Bronx, New York, Queens | 56 min |
| Jul 11, 2:24 PM EDT | Rip Current Statement | OKX | Suffolk | 7 hr |
Nearby
Flash Flood Watches in New York, 2021Flash Flood Watches in New Jersey, 2021Flash Flood Watches in Connecticut, 2021Every flash flood watch in 2021
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.