Alert archive / Connecticut / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS New York, NY

July 18, 2012Greater Bridgeport Planning Region, Connecticut; Westchester County, New York

NWS New York, NY issued this severe thunderstorm warning at Jul 18, 2012, 12:33 PM EDT for Greater Bridgeport Planning Region, Connecticut; Westchester County, New York. It was in force for 42 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
Jul 18, 2012, 12:33 PM EDT (16:33 UTC)
Expired
Jul 18, 2012, 1:15 PM EDT
In force
42 min
Issued by
NWS New York, NY
Area
Storm-based polygon

Counties Greater Bridgeport Planning Region, CT, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 64 km from the middle of the area, began a volume at 16:35 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

TimeReportWhereRemark
Jul 18, 12:35 PM EDTHAIL 1White Plains, NYTIME ESTIMATED FROM RADAR.
Jul 18, 12:44 PM EDTHAIL 0.75White Plains, NYTRAINED SPOTTER

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.

IssuedProductOfficeLasted
Jul 18, 12:20 PM EDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 4.6 hours before the alert went out and 64 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2012-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2129 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2012-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2129 J/kg
Mixed-layer CIN
-147 J/kg
Mixed-layer LCL
1491 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
95 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.

313 
WUUS51 KOKX 181633
SVROKX
CTC001-NYC119-181715-
/O.NEW.KOKX.SV.W.0039.120718T1633Z-120718T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
1233 PM EDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FAIRFIELD COUNTY IN SOUTHERN CONNECTICUT...
  WESTCHESTER COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 115 PM EDT...

* AT 1230 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 SCARSDALE...OR NEAR 
WHITE   PLAINS. THIS STORM WAS MOVING EAST AT 10 MPH. 

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HARRISON...WILTON...WESTPORT...NORWALK...NEW CANAAN...TARRYTOWN...
  NORTH TARRYTOWN...HAWTHORNE AND DOBBS FERRY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM WEDNESDAY
EVENING FOR SOUTHERN CONNECTICUT AND NORTHEAST NEW JERSEY AND
SOUTHEAST NEW YORK.

&&

LAT...LON 4091 7389 4110 7388 4124 7340 4111 7331
      4110 7335 4106 7338 4104 7342 4105 7344
      4099 7358 4101 7359 4099 7363 4099 7361
      4097 7362 4099 7365 4093 7370 4090 7384
TIME...MOT...LOC 1633Z 168DEG 2KT 4101 7377

$$

FIG
2 follow-up statements
853 
WWUS51 KOKX 181655
SVSOKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1255 PM EDT WED JUL 18 2012

CTC001-NYC119-181715-
/O.CON.KOKX.SV.W.0039.000000T0000Z-120718T1715Z/
WESTCHESTER NY-FAIRFIELD CT-
1255 PM EDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM EDT
FOR SOUTHERN FAIRFIELD AND WESTCHESTER COUNTIES...

AT 1254 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR WHITE PLAINS. THIS
STORM WAS NEARLY STATIONARY.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
HARTSDALE AND NORWALK

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM WEDNESDAY
EVENING FOR SOUTHERN CONNECTICUT AND NORTHEAST NEW JERSEY AND
SOUTHEAST NEW YORK.

&&

LAT...LON 4091 7380 4104 7384 4113 7348 4109 7341
      4105 7345 4106 7343 4099 7358 4101 7359
      4099 7363 4099 7361 4097 7362 4099 7365
      4093 7370 4090 7384
TIME...MOT...LOC 1655Z 168DEG 2KT 4102 7377

$$

FIG
455 
WWUS51 KOKX 181714
SVSOKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
114 PM EDT WED JUL 18 2012

CTC001-NYC119-181724-
/O.EXP.KOKX.SV.W.0039.000000T0000Z-120718T1715Z/
WESTCHESTER NY-FAIRFIELD CT-
114 PM EDT WED JUL 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN FAIRFIELD AND
WESTCHESTER COUNTIES WILL EXPIRE AT 115 PM EDT...

THE SEVERE THUNDERSTORMS HAVE MOVED OVER THE AREA WATERS...THEREFORE 
WILL ALLOW THE WARNING TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM WEDNESDAY
EVENING FOR SOUTHERN CONNECTICUT AND NORTHEAST NEW JERSEY AND
SOUTHEAST NEW YORK.

LAT...LON 4091 7380 4104 7384 4113 7348 4109 7341
      4105 7345 4106 7343 4099 7358 4101 7359
      4099 7363 4099 7361 4097 7362 4099 7365
      4093 7370 4090 7384
TIME...MOT...LOC 1714Z 168DEG 2KT 4103 7377

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 12:51 PM EDTAreal Flood AdvisoryOKXGreater Bridgeport Planning Region54 min
Jul 18, 2:26 PM EDTSevere Thunderstorm WarningOKXGreater Bridgeport Planning Region, Naugatuck Valley Planning Region34 min
Jul 18, 2:42 PM EDTAreal Flood AdvisoryOKXLower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region84 min
Jul 18, 2:44 PM EDTSevere Thunderstorm WarningOKXGreater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region55 min
Jul 18, 2:48 PM EDTAreal Flood AdvisoryOKXGreater Bridgeport Planning Region70 min
Jul 18, 2:55 PM EDTAreal Flood AdvisoryOKXGreater Bridgeport Planning Region72 min
Jul 18, 2:55 PM EDTSevere Thunderstorm WarningOKXSoutheastern Connecticut Planning Region65 min
Jul 18, 2:57 PM EDTSevere Thunderstorm WarningOKXGreater Bridgeport Planning Region33 min
Jul 18, 4:10 PM EDTSevere Thunderstorm WarningOKXSoutheastern Connecticut Planning Region24 min
Jul 18, 6:49 PM EDTSpecial Weather StatementOKX56 min
Jul 18, 12:36 PM EDTSpecial Marine WarningOKX39 min
Jul 18, 12:39 PM EDTAreal Flood AdvisoryOKXWestchester81 min
Jul 18, 1:12 PM EDTSpecial Marine WarningOKX63 min
Jul 18, 1:12 PM EDTSevere Thunderstorm WarningOKXOrange63 min
Jul 18, 1:15 PM EDTAreal Flood AdvisoryOKXOrange90 min
Jul 18, 1:19 PM EDTAreal Flood AdvisoryOKXBronx, Nassau, Queens69 min
Jul 18, 1:19 PM EDTSpecial Weather StatementOKXBronx56 min
Jul 18, 2:00 PM EDTAreal Flood AdvisoryOKXPutnam, Rockland, Westchester2 hr
Jul 18, 2:26 PM EDTSevere Thunderstorm WarningOKXOrange, Rockland64 min
Jul 18, 2:36 PM EDTAreal Flood AdvisoryOKXOrange84 min
Jul 18, 2:50 PM EDTSpecial Marine WarningOKX40 min
Jul 18, 2:59 PM EDTSpecial Marine WarningOKX61 min
Jul 18, 3:23 PM EDTSevere Thunderstorm WarningOKXNassau, Suffolk52 min
Jul 18, 3:35 PM EDTSpecial Marine WarningOKX25 min
Jul 18, 3:54 PM EDTSpecial Weather StatementOKXBronx, New York66 min
Jul 18, 3:59 PM EDTSpecial Marine WarningOKX46 min
Jul 18, 4:10 PM EDTAreal Flood AdvisoryOKXBronx, Kings, Nassau, New York, Queens, Richmond and 1 more2 hr
Jul 18, 4:15 PM EDTSevere Thunderstorm WarningOKXNassau, Queens, Suffolk60 min
Jul 18, 4:34 PM EDTFlash Flood WarningOKXBronx, Kings, Nassau, New York, Queens116 min
Jul 18, 4:41 PM EDTSevere Thunderstorm WarningOKXBronx, Kings, New York, Queens49 min
Jul 18, 5:08 PM EDTSpecial Marine WarningOKX52 min
Jul 18, 7:00 PM EDTSpecial Marine WarningOKX45 min
Jul 18, 7:09 PM EDTSpecial Marine WarningOKX66 min
Jul 18, 7:58 PM EDTSpecial Marine WarningOKX47 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2012Severe Thunderstorm Warnings in New York, 2012Every 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.