Alert archive / New York / Tornado Warnings in 2021
Tornado Warning 8, NWS New York, NY
NWS New York, NY issued this tornado warning at Aug 19, 2021, 4:17 AM EDT for Bergen County, New Jersey; Rockland County, Westchester County, New York. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 19, 2021, 4:17 AM EDT (08:17 UTC)
- Expired
- Aug 19, 2021, 4:45 AM EDT
- In force
- 28 min
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Bergen County, NJ, Rockland County, NY, Westchester County, NY
The radar
The Brookhaven radar (KOKX), 102 km from the middle of the area, began a volume at 08:16 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 00:00Z, 8.3 hours before the alert went out and 102 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
- 491 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
018
WFUS51 KOKX 190817
TOROKX
NJC003-NYC087-119-190845-
/O.NEW.KOKX.TO.W.0008.210819T0817Z-210819T0845Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New York NY
417 AM EDT Thu Aug 19 2021
The National Weather Service in Upton NY has issued a
* Tornado Warning for...
Northern Bergen County in northeastern New Jersey...
Northern Westchester County in southeastern New York...
Rockland County in southeastern New York...
* Until 445 AM EDT.
* At 417 AM EDT, a severe thunderstorm capable of producing a tornado
was located near Pearl River, or near Ridgewood, moving north at 30
mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Monsey and Nanuet around 430 AM EDT.
New City and Upper Nyack around 435 AM EDT.
Ossining and Haverstraw around 440 AM EDT.
Peekskill around 445 AM EDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4127 7375 4094 7406 4098 7417 4099 7419
4099 7421 4126 7408 4132 7399 4133 7394
TIME...MOT...LOC 0817Z 201DEG 26KT 4103 7407
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
JC1 follow-up statement
563
WWUS51 KOKX 190834
SVSOKX
Severe Weather Statement
National Weather Service New York NY
434 AM EDT Thu Aug 19 2021
NJC003-190843-
/O.CAN.KOKX.TO.W.0008.000000T0000Z-210819T0845Z/
Bergen NJ-
434 AM EDT Thu Aug 19 2021
...THE TORNADO WARNING FOR NORTHERN BERGEN COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
LAT...LON 4127 7375 4103 7399 4109 7412 4110 7412
4124 7405 4132 7399 4133 7393
TIME...MOT...LOC 0833Z 201DEG 26KT 4114 7401
$$
NYC087-119-190845-
/O.CON.KOKX.TO.W.0008.000000T0000Z-210819T0845Z/
Westchester NY-Rockland NY-
434 AM EDT Thu Aug 19 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 AM EDT FOR NORTHERN
WESTCHESTER AND ROCKLAND COUNTIES...
At 433 AM EDT, a severe thunderstorm capable of producing a tornado
was located over New City, moving north at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Ossining and Haverstraw around 440 AM EDT.
Peekskill around 455 AM EDT.
Yorktown Heights around 500 AM EDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4127 7375 4103 7399 4109 7412 4110 7412
4124 7405 4132 7399 4133 7393
TIME...MOT...LOC 0833Z 201DEG 26KT 4114 7401
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
JCThe office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 2:43 AM EDT | Special Weather Statement | OKX | Passaic | 32 min |
| Aug 19, 2:53 AM EDT | Tornado Warning | OKX | Passaic | 23 min |
| Aug 19, 3:30 AM EDT | Areal Flood Advisory | OKX | Bergen, Essex, Passaic, Union | 2 hr |
| Aug 19, 3:48 AM EDT | Tornado Warning | OKX | Bergen | 27 min |
| Aug 19, 3:21 AM EDT | Special Weather Statement | OKX | Rockland | 24 min |
| Aug 19, 4:44 AM EDT | Tornado Warning | OKX | Putnam, Rockland, Westchester | 31 min |
| Aug 19, 3:00 PM EDT | Small Craft Advisory | OKX | 14 hr |
Nearby
Tornado Warnings in New York, 2021Tornado Warnings in New Jersey, 2021Every tornado warning in 2021Tornadoes 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.