Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 66, NWS New York, NY
NWS New York, NY issued this severe thunderstorm warning at Aug 12, 2021, 4:07 PM EDT for Orange County, Rockland County, New York; Bergen County, Passaic County, New Jersey. It was in force for 41 min. 1 report 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 12, 2021, 4:07 PM EDT (20:07 UTC)
- Expired
- Aug 12, 2021, 4:48 PM EDT
- In force
- 41 min
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bergen County, NJ, Passaic County, NJ, Orange County, NY, Rockland County, NY
The radar
The Brookhaven radar (KOKX), 121 km from the middle of the area, began a volume at 20:07 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 12, 4:45 PM EDT | TSTM WND DMG | 1 Sw Wyckoff, NJ | POLICE REPORT FALLEN TREE AND DOWNED WIRES ON TERRACE HEIGHTS DR. |
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, 8.1 hours before the alert went out and 121 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
- 278 J/kg
- Mixed-layer CIN
- -162 J/kg
- Mixed-layer LCL
- 1400 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -82 m²/s²
- 0-3 km storm-relative helicity
- -47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
063
WUUS51 KOKX 122007
SVROKX
NJC003-031-NYC071-087-122100-
/O.NEW.KOKX.SV.W.0066.210812T2007Z-210812T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
407 PM EDT Thu Aug 12 2021
The National Weather Service in Upton NY has issued a
* Severe Thunderstorm Warning for...
Passaic County in northeastern New Jersey...
Northwestern Bergen County in northeastern New Jersey...
Orange County in southeastern New York...
Rockland County in southeastern New York...
* Until 500 PM EDT.
* At 406 PM EDT, severe thunderstorms were located along a line
extending from Montague to near Branchville to Blairstown, moving
east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
New City, West Milford, Monsey, Nanuet, Ramsey, Ringwood,
Haverstraw, Pompton Lakes, Suffern, Port Jervis, Monroe, West
Point, Warwick, Goshen and Sloatsburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4150 7400 4146 7400 4140 7395 4132 7398
4129 7394 4125 7397 4115 7389 4112 7389
4096 7418 4096 7428 4100 7430 4103 7442
4102 7443 4105 7445 4104 7450 4107 7449
4109 7450 4120 7437 4136 7469 4139 7472
TIME...MOT...LOC 2006Z 263DEG 35KT 4130 7482 4111 7472 4099 7499
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$2 follow-up statements
541
WWUS51 KOKX 122028
SVSOKX
Severe Weather Statement
National Weather Service New York NY
428 PM EDT Thu Aug 12 2021
NJC003-031-NYC071-087-122100-
/O.CON.KOKX.SV.W.0066.000000T0000Z-210812T2100Z/
Passaic NJ-Bergen NJ-Orange NY-Rockland NY-
428 PM EDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR PASSAIC...NORTHWESTERN BERGEN...SOUTHERN ORANGE AND ROCKLAND
COUNTIES...
At 427 PM EDT, severe thunderstorms were located along a line
extending from Unionville to near Kinnelon to Hackettstown, moving
east at 55 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
New City, West Milford, Monsey, Nanuet, Ramsey, Ringwood, Haverstraw,
Pompton Lakes, Suffern, Warwick, Sloatsburg, Pearl River,
Bloomingdale, Greenwood Lake and Pomona.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4105 7446 4110 7449 4120 7437 4132 7460
4133 7461 4123 7395 4115 7389 4112 7389
4096 7418 4096 7428 4100 7430 4103 7442
4102 7443
TIME...MOT...LOC 2027Z 288DEG 46KT 4128 7455 4103 7439 4087 7481
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$811
WWUS51 KOKX 122048
SVSOKX
Severe Weather Statement
National Weather Service New York NY
448 PM EDT Thu Aug 12 2021
NJC003-031-NYC071-087-122056-
/O.CAN.KOKX.SV.W.0066.000000T0000Z-210812T2100Z/
Passaic NJ-Bergen NJ-Orange NY-Rockland NY-
448 PM EDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR PASSAIC...NORTHWESTERN
BERGEN...SOUTHERN ORANGE AND ROCKLAND COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened. Therefore, the
warning has been cancelled.
Additional thunderstorms continue to develop across southeastern
Orange county. Locally heavy rain and gusty winds can be expected
with this activity.
LAT...LON 4105 7446 4110 7449 4120 7437 4132 7460
4133 7461 4123 7395 4115 7389 4112 7389
4096 7418 4096 7428 4100 7430 4103 7442
4102 7443
TIME...MOT...LOC 2045Z 263DEG 35KT 4130 7431 4105 7415 4089 7457
$$The office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 8:32 PM EDT | Special Weather Statement | OKX | Westchester | 28 min |
| Aug 11, 8:39 PM EDT | Areal Flood Advisory | OKX | Kings, New York, Queens, Richmond | 2 hr |
| Aug 11, 9:00 PM EDT | Special Marine Warning | OKX | 30 min | |
| Aug 11, 9:01 PM EDT | Special Weather Statement | OKX | Kings, New York, Richmond | 29 min |
| Aug 11, 9:25 PM EDT | Special Weather Statement | OKX | Kings, Queens | 35 min |
| Aug 11, 9:27 PM EDT | Special Marine Warning | OKX | 33 min | |
| Aug 12, 4:21 PM EDT | Special Weather Statement | OKX | Dutchess | 24 min |
| Aug 12, 4:39 PM EDT | Special Weather Statement | OKX | Bronx, New York | 51 min |
| Aug 12, 4:45 PM EDT | Special Marine Warning | OKX | 90 min | |
| Aug 12, 4:53 PM EDT | Special Weather Statement | OKX | Rockland | 52 min |
| Aug 12, 5:04 PM EDT | Severe Thunderstorm Warning | OKX | Orange, Putnam, Rockland, Westchester | 22 min |
| Aug 12, 5:20 PM EDT | Special Weather Statement | OKX | Nassau | 40 min |
| Aug 12, 5:53 PM EDT | Special Weather Statement | OKX | Suffolk | 52 min |
Nearby
Severe Thunderstorm Warnings in New York, 2021Severe Thunderstorm Warnings in New Jersey, 2021Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.