Alert archive / New York / Tornado Warnings in 2021
Tornado Warning 9, NWS New York, NY
NWS New York, NY issued this tornado warning at Aug 19, 2021, 4:44 AM EDT for Putnam County, Rockland County, Westchester County, New York. It was in force for 31 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, 4:44 AM EDT (08:44 UTC)
- Expired
- Aug 19, 2021, 5:15 AM EDT
- In force
- 31 min
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Putnam County, NY, Rockland County, NY, Westchester County, NY
The radar
The Brookhaven radar (KOKX), 84 km from the middle of the area, began a volume at 08:45 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, 8.7 hours before the alert went out and 84 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.
023
WFUS51 KOKX 190844
TOROKX
NYC079-087-119-190915-
/O.NEW.KOKX.TO.W.0009.210819T0844Z-210819T0915Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New York NY
444 AM EDT Thu Aug 19 2021
The National Weather Service in Upton NY has issued a
* Tornado Warning for...
Northern Westchester County in southeastern New York...
Eastern Putnam County in southeastern New York...
Rockland County in southeastern New York...
* Until 515 AM EDT.
* At 443 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Upper Nyack, or over Nyack, moving northeast 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...
Mount Kisco around 500 AM EDT.
Yorktown Heights around 505 AM EDT.
Mahopac around 515 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 4134 7355 4130 7355 4101 7384 4110 7405
4142 7379
TIME...MOT...LOC 0843Z 211DEG 28KT 4112 7390
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
JC2 follow-up statements
050
WWUS51 KOKX 190902
SVSOKX
Severe Weather Statement
National Weather Service New York NY
502 AM EDT Thu Aug 19 2021
NYC087-190911-
/O.CAN.KOKX.TO.W.0009.000000T0000Z-210819T0915Z/
Rockland NY-
502 AM EDT Thu Aug 19 2021
...THE TORNADO WARNING FOR ROCKLAND COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
LAT...LON 4134 7355 4130 7355 4113 7375 4120 7388
4142 7379
TIME...MOT...LOC 0901Z 211DEG 28KT 4125 7380
$$
NYC079-119-190915-
/O.CON.KOKX.TO.W.0009.000000T0000Z-210819T0915Z/
Westchester NY-Putnam NY-
502 AM EDT Thu Aug 19 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 AM EDT FOR NORTHERN
WESTCHESTER AND EASTERN PUTNAM COUNTIES...
At 501 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Yorktown Heights, or near Mount Kisco, moving
northeast 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...
Yorktown Heights around 505 AM EDT.
Mahopac around 520 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 4134 7355 4130 7355 4113 7375 4120 7388
4142 7379
TIME...MOT...LOC 0901Z 211DEG 28KT 4125 7380
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
JC873
WWUS51 KOKX 190915
SVSOKX
Severe Weather Statement
National Weather Service New York NY
515 AM EDT Thu Aug 19 2021
NYC079-119-190924-
/O.EXP.KOKX.TO.W.0009.000000T0000Z-210819T0915Z/
Westchester NY-Putnam NY-
515 AM EDT Thu Aug 19 2021
...THE TORNADO WARNING FOR NORTHERN WESTCHESTER AND EASTERN PUTNAM
COUNTIES WILL EXPIRE AT 515 AM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.
LAT...LON 4134 7355 4130 7355 4113 7375 4120 7388
4142 7379
TIME...MOT...LOC 0914Z 211DEG 28KT 4134 7373
$$
JCThe office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 3:21 AM EDT | Special Weather Statement | OKX | Rockland | 24 min |
| Aug 19, 3:30 AM EDT | Areal Flood Advisory | OKX | Rockland | 2 hr |
| Aug 19, 3:48 AM EDT | Tornado Warning | OKX | Orange, Rockland, Westchester | 27 min |
| Aug 19, 4:17 AM EDT | Tornado Warning | OKX | Rockland, Westchester | 28 min |
| Aug 19, 3:00 PM EDT | Small Craft Advisory | OKX | 14 hr |
Nearby
Tornado Warnings in New York, 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.