Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 2, NWS New York, NY

April 28, 20114 counties in New York; Bergen County, Essex County, Passaic County, New Jersey

NWS New York, NY issued this severe thunderstorm warning at Apr 28, 2011, 12:16 PM EDT for 4 counties in New York; Bergen County, Essex County, Passaic County, New Jersey. It was in force for 29 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: Apr 28, 2011, 12:16 PM EDT (16:16 UTC)
Expired: Apr 28, 2011, 12:45 PM EDT
In force: 29 min
Issued by: NWS New York, NY
Area: Storm-based polygon

Counties Bergen County, NJ, Essex County, NJ, Passaic County, NJ, Orange County, NY, Putnam County, NY, Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 112 km from the middle of the area, began a volume at 16:17 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 28, 9:45 AM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 4.3 hours before the alert went out and 112 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: 211 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 513 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 346 m²/s²
0-3 km storm-relative helicity: 324 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.

697 
WUUS51 KOKX 281616
SVROKX
NJC003-013-031-NYC071-079-087-119-281645-
/O.NEW.KOKX.SV.W.0002.110428T1616Z-110428T1645Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
1216 PM EDT THU APR 28 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTCHESTER COUNTY IN SOUTHEAST NEW YORK...
  PASSAIC COUNTY IN NORTHEAST NEW JERSEY...
  ROCKLAND COUNTY IN SOUTHEAST NEW YORK...
  PUTNAM COUNTY IN SOUTHEAST NEW YORK...
  SOUTHEASTERN ORANGE COUNTY IN SOUTHEAST NEW YORK...
  NORTHWESTERN ESSEX COUNTY IN NORTHEAST NEW JERSEY...
  NORTHERN BERGEN COUNTY IN NORTHEAST NEW JERSEY...

* UNTIL 1245 PM EDT...

* AT 1213 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM WEST MILFORD TO WAYNE TO 7 MILES SOUTH OF
  FAIRFIELD...OR ALONG A LINE EXTENDING FROM WEST MILFORD TO
  PEQUANNOCK TOWNSHIP TO MILLBURN...AND MOVING NORTHEAST AT 65 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  RINGWOOD...HAWTHORNE...PATERSON...RAMSEY...WARWICK...RIDGEWOOD...
  GREENWOOD LAKE...SUFFERN...SLOATSBURG...PARAMUS...MONSEY...
  NANUET...PEARL RIVER...MONROE...POMONA...NEW CITY...TAPPAN...
  HARRIMAN...HAVERSTRAW...OSSINING...NORTH TARRYTOWN...TARRYTOWN...
  DOBBS FERRY...WEST POINT...PEEKSKILL...YORKTOWN HEIGHTS...MOUNT
  KISCO AND COLD SPRING

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM THURSDAY
AFTERNOON FOR SOUTHERN CONNECTICUT AND NORTHEAST NEW JERSEY AND
SOUTHEAST NEW YORK.

&&

LAT...LON 4119 7438 4123 7444 4150 7390 4113 7366
      4110 7372 4106 7369 4098 7390 4114 7390
      4117 7393 4100 7395 4081 7434 4086 7432
      4090 7434 4090 7428 4097 7428 4099 7432
      4101 7443 4104 7444 4103 7450 4108 7451
TIME...MOT...LOC 1616Z 237DEG 56KT 4112 7443 4097 7424
          4080 7427

$$

MALOIT

1 follow-up statement

484 
WWUS51 KOKX 281642
SVSOKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1242 PM EDT THU APR 28 2011

NJC003-013-031-NYC071-079-087-119-281653-
/O.EXP.KOKX.SV.W.0002.000000T0000Z-110428T1645Z/
BERGEN NJ-ESSEX NJ-ORANGE NY-PUTNAM NY-ROCKLAND NY-PASSAIC NJ-
WESTCHESTER NY-
1242 PM EDT THU APR 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTCHESTER...PASSAIC...
ROCKLAND...PUTNAM...SOUTHEASTERN ORANGE...NORTHWESTERN ESSEX AND
NORTHERN BERGEN COUNTIES WILL EXPIRE AT 1245 PM EDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM THURSDAY
AFTERNOON FOR SOUTHERN CONNECTICUT AND NORTHEAST NEW JERSEY AND
SOUTHEAST NEW YORK.

LAT...LON 4119 7438 4123 7444 4150 7390 4113 7366
      4110 7372 4106 7369 4098 7390 4114 7390
      4117 7393 4100 7395 4081 7434 4086 7432
      4090 7434 4090 7428 4097 7428 4099 7432
      4101 7443 4104 7444 4103 7450 4108 7451
TIME...MOT...LOC 1643Z 237DEG 56KT 4135 7396 4120 7377
          4103 7380

$$

MALOIT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 9:07 PM EDT	Marine Dense Fog Advisory	OKX		33 hr
Apr 28, 4:35 AM EDT	High Surf Advisory	OKX	Nassau, Suffolk	21 hr
Apr 28, 7:25 AM EDT	Dense Fog Advisory	OKX	Kings, Nassau, Queens, Suffolk	8 hr
Apr 28, 7:51 AM EDT	Special Weather Statement	OKX	Orange	39 min
Apr 28, 9:16 AM EDT	Special Weather Statement	OKX	Bronx, Kings, Nassau, New York, Queens	44 min
Apr 28, 10:45 AM EDT	Special Weather Statement	OKX	Orange	60 min
Apr 28, 11:24 AM EDT	Areal Flood Advisory	OKX	Orange	111 min
Apr 28, 11:38 AM EDT	Special Weather Statement	OKX	Putnam, Rockland, Westchester	67 min
Apr 28, 11:42 AM EDT	Flash Flood Warning	OKX	Orange, Rockland	2 hr
Apr 28, 11:43 AM EDT	Tornado Warning	OKX	Orange, Rockland	32 min
Apr 28, 12:06 PM EDT	Severe Thunderstorm Warning	OKX	Rockland	24 min
Apr 28, 12:13 PM EDT	Areal Flood Advisory	OKX	Orange, Putnam, Westchester	2 hr
Apr 28, 12:30 PM EDT	Areal Flood Advisory	OKX	Rockland, Westchester	3 hr
Apr 28, 12:45 PM EDT	Special Weather Statement	OKX	Putnam, Rockland, Westchester	30 min
Apr 28, 1:12 PM EDT	Special Weather Statement	OKX	Bronx, New York, Putnam, Richmond, Rockland, Westchester	33 min
Apr 28, 1:18 PM EDT	Special Marine Warning	OKX		27 min
Apr 28, 2:07 PM EDT	Special Marine Warning	OKX		23 min
Apr 28, 3:06 PM EDT	Special Marine Warning	OKX		24 min
Apr 28, 3:25 PM EDT	Special Weather Statement	OKX	Suffolk	35 min

Nearby

Severe Thunderstorm Warnings in New York, 2011 Severe Thunderstorm Warnings in New Jersey, 2011 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.