Alert archive / New York / Tornado Warnings in 2011

Tornado Warning 4, NWS New York, NY

July 29, 2011Rockland County, Westchester County, New York

NWS New York, NY issued this tornado warning at Jul 29, 2011, 5:57 PM EDT for Rockland County, Westchester County, New York. It was in force for 33 min. 3 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: Jul 29, 2011, 5:57 PM EDT (21:57 UTC)
Expired: Jul 29, 2011, 6:30 PM EDT
In force: 33 min
Issued by: NWS New York, NY
Area: Storm-based polygon

Counties Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 88 km from the middle of the area, began a volume at 21:59 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
Jul 29, 5:57 PM EDT	FUNNEL CLOUD	Haverstraw, NY	FUNNEL CLOUD REPORTED AT RAILROAD AVENUE AND ROUTE 9W.
Jul 29, 5:57 PM EDT	FUNNEL CLOUD	Haverstraw, NY	FUNNEL CLOUD REPORTED AT RAILROAD AVENUE AND ROUTE 9W.
Jul 29, 6:25 PM EDT	TSTM WND DMG	Elmsford, NY	NUMEROUS TREES AND WIRES DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 29, 2:40 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 29, 5:03 PM EDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.0 hours before the alert went out and 88 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: 81 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

081 
WFUS51 KOKX 292157
TOROKX
NYC087-119-292230-
/O.NEW.KOKX.TO.W.0004.110729T2157Z-110729T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
557 PM EDT FRI JUL 29 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* TORNADO WARNING FOR...
  WESTCHESTER COUNTY IN SOUTHEAST NEW YORK...
  ROCKLAND COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 630 PM EDT...

* AT 555 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  HAVERSTRAW...MOVING SOUTHEAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  OSSINING...UPPER NYACK...NYACK...NORTH TARRYTOWN...TARRYTOWN AND
  HAWTHORNE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK. A SEVERE THUNDERSTORM
WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK.

&&

LAT...LON 4131 7394 4112 7368 4110 7372 4108 7371
      4098 7382 4119 7409
TIME...MOT...LOC 2157Z 311DEG 27KT 4118 7392

$$

JM

2 follow-up statements

822 
WWUS51 KOKX 292214
SVSOKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
614 PM EDT FRI JUL 29 2011

NYC087-119-292230-
/O.CON.KOKX.TO.W.0004.000000T0000Z-110729T2230Z/
ROCKLAND NY-WESTCHESTER NY-
614 PM EDT FRI JUL 29 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
WESTCHESTER AND ROCKLAND COUNTIES...

AT 612 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR BRIARCLIFF
MANOR...OR NEAR NORTH TARRYTOWN...MOVING SOUTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
PLEASANTVILLE...TARRYTOWN...HAWTHORNE...IRVINGTON...THORNWOOD...
ELMSFORD...ARMONK...ARDSLEY...HARTSDALE AND GREENVILLE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK. A SEVERE THUNDERSTORM
WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK.

&&

LAT...LON 4123 7384 4112 7368 4110 7372 4108 7371
      4098 7382 4113 7399
TIME...MOT...LOC 2213Z 314DEG 25KT 4112 7384

$$

JM

982 
WWUS51 KOKX 292220
SVSOKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
620 PM EDT FRI JUL 29 2011

NYC087-292229-
/O.CAN.KOKX.TO.W.0004.000000T0000Z-110729T2230Z/
ROCKLAND NY-
620 PM EDT FRI JUL 29 2011

...THE TORNADO WARNING FOR ROCKLAND COUNTY IS CANCELLED...

THE RADAR INDICATED TORNADO HAS MOVED OUT OF ROCKLAND COUNTY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK. A SEVERE THUNDERSTORM
WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK.

LAT...LON 4123 7384 4112 7368 4110 7372 4108 7371
      4098 7382 4109 7390 4113 7390
TIME...MOT...LOC 2219Z 314DEG 25KT 4109 7380

$$

NYC119-292230-
/O.CON.KOKX.TO.W.0004.000000T0000Z-110729T2230Z/
WESTCHESTER NY-
620 PM EDT FRI JUL 29 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
WESTCHESTER COUNTY...

AT 616 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR HAWTHORNE...OR
NEAR NORTH TARRYTOWN...MOVING SOUTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
ELMSFORD...ARMONK...ARDSLEY...HARTSDALE AND GREENVILLE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK. A SEVERE THUNDERSTORM
WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK.

&&

LAT...LON 4123 7384 4112 7368 4110 7372 4108 7371
      4098 7382 4109 7390 4113 7390
TIME...MOT...LOC 2219Z 314DEG 25KT 4109 7380

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 4:01 AM EDT	Small Craft Advisory	OKX		19 hr
Jul 29, 4:19 PM EDT	Special Weather Statement	OKX	Orange	41 min
Jul 29, 4:32 PM EDT	Severe Thunderstorm Warning	OKX	Orange	43 min
Jul 29, 4:54 PM EDT	Tornado Warning	OKX	Orange	36 min
Jul 29, 5:22 PM EDT	Tornado Warning	OKX	Orange, Rockland, Westchester	38 min
Jul 29, 5:34 PM EDT	Severe Thunderstorm Warning	OKX	Orange	41 min
Jul 29, 6:09 PM EDT	Special Marine Warning	OKX		54 min
Jul 29, 6:16 PM EDT	Severe Thunderstorm Warning	OKX	Orange	44 min
Jul 29, 6:26 PM EDT	Tornado Warning	OKX	Westchester	34 min
Jul 29, 6:42 PM EDT	Severe Thunderstorm Warning	OKX	Nassau, Suffolk	48 min
Jul 29, 6:49 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Rockland, Westchester	27 min
Jul 29, 7:13 PM EDT	Severe Thunderstorm Warning	OKX	Kings, New York, Queens	32 min
Jul 29, 7:32 PM EDT	Special Weather Statement	OKX	Nassau	43 min
Jul 29, 7:39 PM EDT	Special Marine Warning	OKX		36 min
Jul 29, 7:47 PM EDT	Special Weather Statement	OKX	Queens	28 min

Nearby

Tornado Warnings in New York, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.