Alert archive / New York / Tornado Warnings in 2018

Tornado Warning 6, NWS New York, NY

October 2, 2018Westchester County, New York

NWS New York, NY issued this tornado warning at Oct 2, 2018, 4:43 PM EDT for Westchester County, New York. It was in force for 32 min. 4 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: Oct 2, 2018, 4:43 PM EDT (20:43 UTC)
Expired: Oct 2, 2018, 5:15 PM EDT
In force: 32 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Westchester County, NY

The radar

The Brookhaven radar (KOKX), 84 km from the middle of the area, began a volume at 20:47 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
Oct 2, 4:44 PM EDT	TORNADO	1 W Millwood, NY	STORM SURVEY TEAM CONFIRMED AN EF1 TORNADO IN THE NEW CASTLE AREA OF WESTCHESTER COUNTY WITH ESTIMATED PEAK WINDS OF 110 MPH, A 300 YARD PATH WIDTH, AND A PATH LENGTH OF 3.75 MILES.
Oct 2, 4:47 PM EDT	TORNADO	1 W Millwood, NY	STORM SURVEY TEAM CONFIRMED AN EF1 TORNADO IN THE NEW CASTLE AREA OF WESTCHESTER COUNTY WITH ESTIMATED PEAK WINDS OF 110 MPH, A 300 YARD PATH WIDTH, AND A PATH LENGTH OF 3.75 MILES.
Oct 2, 4:58 PM EDT	TSTM WND DMG	Mount Kisco, NY	TREES DOWN ON SAW MILL RIVER PARKWAY AND MAIN STREET
Oct 2, 5:02 PM EDT	TSTM WND DMG	Chappaqua, NY	TREE DOWN ON QUAKER LANE

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, 8.7 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.

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: 54 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 563 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

149 
WFUS51 KOKX 022043
TOROKX
NYC119-022115-
/O.NEW.KOKX.TO.W.0006.181002T2043Z-181002T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New York NY
443 PM EDT TUE OCT 2 2018

The National Weather Service in Upton NY has issued a

* Tornado Warning for...
  Northern Westchester County in southeastern New York...

* Until 515 PM EDT.
    
* At 443 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Yorktown Heights, or near Mount Kisco, moving east
  at 20 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 455 PM EDT.
  Bedford around 505 PM EDT.
  Greenwich around 510 PM 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 or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4131 7355 4118 7356 4111 7370 4113 7389
      4115 7389 4116 7391 4119 7392 4131 7390
TIME...MOT...LOC 2043Z 275DEG 19KT 4122 7382 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Goodman

2 follow-up statements

474 
WWUS51 KOKX 022104
SVSOKX

Severe Weather Statement
National Weather Service New York NY
504 PM EDT TUE OCT 2 2018

NYC119-022115-
/O.CON.KOKX.TO.W.0006.000000T0000Z-181002T2115Z/
Westchester NY-
504 PM EDT TUE OCT 2 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM EDT FOR CENTRAL
WESTCHESTER COUNTY...
    
At 504 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Mount Kisco, moving east at 15 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Damage to roofs, windows, and vehicles will occur. 
         Tree damage is likely.

Locations impacted include...
Mount Kisco, Bedford and Armonk. 

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 or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4118 7356 4111 7370 4115 7379 4121 7378
      4127 7355
TIME...MOT...LOC 2104Z 279DEG 14KT 4118 7370 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Goodman

079 
WWUS51 KOKX 022115
SVSOKX

Severe Weather Statement
National Weather Service New York NY
515 PM EDT TUE OCT 2 2018

NYC119-022124-
/O.EXP.KOKX.TO.W.0006.000000T0000Z-181002T2115Z/
Westchester NY-
515 PM EDT TUE OCT 2 2018

...THE TORNADO WARNING FOR CENTRAL WESTCHESTER COUNTY WILL EXPIRE AT
515 PM EDT...
        
The storm which prompted the warning has weakened below severe 
limits, and is exiting the warned area. Therefore, the warning will 
be allowed to expire. However small hail, gusty winds and heavy rain 
are still possible with this thunderstorm.

A Tornado Watch remains in effect until midnight EDT for southern
Connecticut and southeastern New York.

LAT...LON 4118 7356 4111 7370 4115 7379 4121 7378
      4127 7355
TIME...MOT...LOC 2114Z 275DEG 19KT 4118 7363 

$$

Goodman

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 2, 2:27 PM EDT	Special Weather Statement	OKX	Orange	63 min
Oct 2, 3:21 PM EDT	Special Weather Statement	OKX	Orange	39 min
Oct 2, 4:00 PM EDT	Special Weather Statement	OKX	Rockland, Westchester	60 min
Oct 2, 4:12 PM EDT	Tornado Warning	OKX	Rockland, Westchester	33 min
Oct 2, 5:35 PM EDT	Special Marine Warning	OKX		28 min
Oct 2, 6:12 PM EDT	Special Weather Statement	OKX	Westchester	63 min
Oct 2, 6:23 PM EDT	Areal Flood Advisory	OKX	Orange, Putnam, Rockland, Westchester	3 hr
Oct 2, 6:43 PM EDT	Severe Thunderstorm Warning	OKX	Westchester	47 min
Oct 2, 6:49 PM EDT	Flash Flood Warning	OKX	Orange, Rockland, Westchester	3 hr
Oct 2, 6:59 PM EDT	Special Marine Warning	OKX		31 min
Oct 2, 7:25 PM EDT	Special Marine Warning	OKX		50 min
Oct 2, 7:36 PM EDT	Severe Thunderstorm Warning	OKX	Suffolk	24 min
Oct 2, 7:58 PM EDT	Special Marine Warning	OKX		47 min

Nearby

Tornado Warnings in New York, 2018 Every tornado warning in 2018 Tornadoes 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.