Alert archive / New York / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 63, NWS New York, NY

August 9, 2012Putnam County, Westchester County, New York

NWS New York, NY issued this severe thunderstorm warning at Aug 9, 2012, 5:19 PM EDT for Putnam County, Westchester County, New York. It was in force for 41 min. 2 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: Aug 9, 2012, 5:19 PM EDT (21:19 UTC)
Expired: Aug 9, 2012, 6:00 PM EDT
In force: 41 min
Issued by: NWS New York, NY
Area: Storm-based polygon

Counties Putnam County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 103 km from the middle of the area, began a volume at 21:20 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 9, 5:20 PM EDT	HAIL 0.75	Carmel, NY	PENNY SIZED HAIL.
Aug 9, 5:50 PM EDT	TSTM WND DMG	Carmel, NY	TREE DOWN ON SECOR ROAD.

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, 9.3 hours before the alert went out and 103 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: 802 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 932 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 33 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.

653 
WUUS51 KOKX 092119
SVROKX
NYC079-119-092200-
/O.NEW.KOKX.SV.W.0063.120809T2119Z-120809T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
519 PM EDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHERN WESTCHESTER COUNTY IN SOUTHEAST NEW YORK...
  PUTNAM COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 600 PM EDT...

* AT 512 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR COLD SPRING...AND MOVING
  EAST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FAHNESTOCK STATE PARK BY 550 PM...
  MAHOPAC...7 MILES NORTH OF YORKTOWN HEIGHTS AND 8 MILES WEST OF
  CARMEL BY 600 PM...

LAT...LON 4151 7361 4123 7369 4132 7398 4133 7398
      4135 7396 4140 7395 4143 7398 4145 7398
      4147 7395
TIME...MOT...LOC 2118Z 280DEG 6KT 4138 7392

$$

JST

2 follow-up statements

154 
WWUS51 KOKX 092140
SVSOKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
540 PM EDT THU AUG 9 2012

NYC079-119-092200-
/O.CON.KOKX.SV.W.0063.000000T0000Z-120809T2200Z/
PUTNAM NY-WESTCHESTER NY-
540 PM EDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT 
FOR PUTNAM AND EXTREME NORTHERN WESTCHESTER COUNTIES...

AT 533 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING 
DAMAGING WINDS IN EXCESS OF 60 MPH ALONG WITH NICKLE SIZE HAIL ALONG 
THE TACONIC PARKWAY FROM FAHNESTOCK STATE PARK EXTENDING SOUTHWEST 
TO PEEKSKILL EAST AT 10 MPH.

TORRENTIAL RAIN IS FALLING WITH THESE STORMS AS WELL LOWERING 
VISIBILITY TO NEAR ZERO FOR A BRIEF TIME. 

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MAHOPAC AND YORKTOWN HEIGHTS BY 555 PM...
  LAKE CARMEL AND CARMEL BY 600 PM...

LAT...LON 4123 7369 4132 7397 4140 7391 4142 7390
      4144 7390 4148 7389 4151 7361
TIME...MOT...LOC 2135Z 266DEG 11KT 4146 7383

$$

JST

273 
WWUS51 KOKX 092155
SVSOKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
555 PM EDT THU AUG 9 2012

NYC079-119-092203-
/O.EXP.KOKX.SV.W.0063.000000T0000Z-120809T2200Z/
PUTNAM NY-WESTCHESTER NY-
555 PM EDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTCHESTER AND PUTNAM
COUNTIES WILL EXPIRE AT 600 PM EDT...

HEAVY RAIN UP TO AN INCH PER HOUR...GUSTY WINDS AND FREQUENT 
LIGHTNING WILL REMAIN POSSIBLE AS THE STORM TREKS TO THE EAST.

LAT...LON 4123 7369 4132 7397 4140 7391 4142 7390
      4144 7390 4148 7389 4151 7361
TIME...MOT...LOC 2153Z 266DEG 11KT 4146 7376

$$
SEARS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 3:04 PM EDT	Special Weather Statement	OKX	Orange	56 min
Aug 9, 4:01 PM EDT	Special Weather Statement	OKX	Orange	59 min
Aug 9, 4:59 PM EDT	Special Weather Statement	OKX	Putnam, Rockland, Westchester	61 min
Aug 9, 5:08 PM EDT	Special Weather Statement	OKX	New York, Richmond	52 min
Aug 9, 5:17 PM EDT	Areal Flood Advisory	OKX	Richmond	58 min
Aug 9, 6:02 PM EDT	Special Weather Statement	OKX	Putnam	43 min

Nearby

Severe Thunderstorm Warnings in New York, 2012 Every severe thunderstorm warning in 2012

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.