Alert archive / Connecticut / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 50, NWS Boston/Norton, MA

July 18, 2012Capitol Planning Region, Connecticut; Hampden County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 18, 2012, 2:21 PM EDT for Capitol Planning Region, Connecticut; Hampden County, Massachusetts. It was in force for 54 min. 1 report 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, 2:21 PM EDT (18:21 UTC)
Expired
Jul 18, 2012, 3:15 PM EDT
In force
54 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Capitol Planning Region, CT, Hampden County, MA

The radar

The Brookhaven radar (KOKX), 121 km from the middle of the area, began a volume at 18:23 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, 2:35 PM EDTTSTM WND GST 631 Wnw Windsor Locks, CT

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

Albany, NY (KALY), launched 12:00Z, 6.4 hours before the alert went out and 117 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, Albany, NY at 12:00Z on 2012-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1053 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 12:00Z on 2012-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 square meters per square second.19395878Sfc1 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
1053 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
918 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.0

Open this sounding in Storm Lab

The text

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

909 
WUUS51 KBOX 181821
SVRBOX
MAC009-017-025-181900-
/O.NEW.KBOX.SV.W.0049.120718T1821Z-120718T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
221 PM EDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN ESSEX COUNTY IN EASTERN MASSACHUSETTS...
  NORTHEASTERN MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
  EXTREME NORTHEASTERN SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...

* UNTIL 300 PM EDT

* AT 218 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN
  EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WILMINGTON...OR 6
  MILES SOUTH OF LAWRENCE...AND MOVING SOUTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LYNN...LAWRENCE...BEVERLY...MALDEN...PEABODY...REVERE...
  HAMILTON...WENHAM...WOBURN...MELROSE...SAUGUS...DANVERS...
  WAKEFIELD...READING...BURLINGTON...STONEHAM...WILMINGTON...
  NORTH READING...LYNNFIELD AND MIDDLETON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR
PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4259 7065 4257 7075 4253 7078 4256 7079
      4254 7089 4253 7090 4254 7087 4252 7089
      4250 7089 4252 7086 4251 7082 4251 7082
      4246 7094 4242 7091 4246 7094 4244 7097
      4239 7098 4254 7128 4271 7117
TIME...MOT...LOC 1818Z 295DEG 25KT 4261 7116 

$$

KJC
2 follow-up statements
574 
WWUS51 KBOX 181859
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
259 PM EDT WED JUL 18 2012

CTC003-013-MAC013-181915-
/O.CON.KBOX.SV.W.0050.000000T0000Z-120718T1915Z/
HARTFORD CT-TOLLAND CT-HAMPDEN MA-
259 PM EDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM
EDT FOR NORTHEASTERN HARTFORD...NORTHWESTERN TOLLAND AND
SOUTHEASTERN HAMPDEN COUNTIES...

AT 255 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR SOMERS...OR 8 MILES
EAST OF WINDSOR LOCKS...MOVING EAST AT 25 MPH.

THIS SEVERE STORM WILL BE NEAR...
  SOMERS AND ELLINGTON AROUND 225 PM EDT.
  HAMPDEN AROUND 230 PM EDT.
  STAFFORD AROUND 250 PM EDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
STAFFORD SPRINGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MILES
PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY
RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4188 7253 4192 7252 4197 7255 4204 7255
      4216 7227 4215 7227 4189 7225 4184 7294
      4184 7294
TIME...MOT...LOC 1855Z 272DEG 21KT 4196 7250 

$$

FRANK
133 
WWUS51 KBOX 181907
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
307 PM EDT WED JUL 18 2012

CTC003-013-MAC013-181915-
/O.CON.KBOX.SV.W.0050.000000T0000Z-120718T1915Z/
HARTFORD CT-TOLLAND CT-HAMPDEN MA-
307 PM EDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM
EDT FOR NORTHEASTERN HARTFORD...CENTRAL TOLLAND AND EXTREME EAST
CENTRAL HAMPDEN COUNTIES...

AT 304 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WILLINGTON...OR 7
MILES NORTHWEST OF MANSFIELD...MOVING EAST AT 35 MPH.

THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
NORTHEASTERN HARTFORD...CENTRAL TOLLAND AND EXTREME
EAST CENTRAL HAMPDEN COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MILES
PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY
RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4189 7246 4192 7241 4197 7238 4196 7226
      4214 7227 4214 7227 4189 7225 4184 7293
      4184 7293
TIME...MOT...LOC 1904Z 285DEG 31KT 4191 7236 

$$

FRANK

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 18, 12:41 PM EDTHeat AdvisoryBOXCapitol Planning Region, Northeastern Connecticut Planning Region6 hr
Jul 18, 2:04 PM EDTSevere Thunderstorm WarningBOXNortheastern Connecticut Planning Region56 min
Jul 18, 2:24 PM EDTFlash Flood WarningBOXCapitol Planning Region, Northeastern Connecticut Planning Region3 hr
Jul 18, 2:29 PM EDTSevere Thunderstorm WarningBOXCapitol Planning Region, Northeastern Connecticut Planning Region61 min
Jul 18, 2:44 PM EDTSevere Thunderstorm WarningBOXNortheastern Connecticut Planning Region61 min
Jul 18, 3:46 PM EDTSevere Thunderstorm WarningBOXNortheastern Connecticut Planning Region59 min
Jul 17, 8:23 PM EDTSpecial Weather StatementBOXEssex67 min
Jul 18, 12:37 PM EDTSpecial Weather StatementBOXMiddlesex53 min
Jul 18, 12:54 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex66 min
Jul 18, 1:21 PM EDTSpecial Marine WarningBOX84 min
Jul 18, 1:29 PM EDTFlash Flood WarningBOXEssex, Middlesex98 min
Jul 18, 1:43 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Suffolk36 min
Jul 18, 1:45 PM EDTSpecial Marine WarningBOX60 min
Jul 18, 1:50 PM EDTSpecial Weather StatementBOXHampden40 min
Jul 18, 2:04 PM EDTTornado WarningBOXEssex, Suffolk12 min
Jul 18, 2:21 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Suffolk39 min
Jul 18, 2:30 PM EDTSpecial Marine WarningBOX90 min
Jul 18, 2:39 PM EDTSevere Thunderstorm WarningBOXBristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester51 min
Jul 18, 3:09 PM EDTSevere Thunderstorm WarningBOXBristol, Norfolk, Worcester51 min
Jul 18, 4:04 PM EDTSpecial Marine WarningBOX56 min
Jul 18, 4:25 PM EDTSpecial Marine WarningBOX80 min
Jul 18, 4:42 PM EDTSevere Thunderstorm WarningBOXBarnstable, Plymouth36 min
Jul 18, 5:08 PM EDTSpecial Weather StatementBOXNorfolk, Suffolk52 min
Jul 18, 5:24 PM EDTFlash Flood WarningBOXMiddlesex, Norfolk, Suffolk78 min
Jul 18, 5:27 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Norfolk, Plymouth, Suffolk48 min
Jul 18, 5:30 PM EDTSpecial Marine WarningBOX54 min
Jul 18, 6:08 PM EDTSpecial Marine WarningBOX67 min
Jul 18, 6:27 PM EDTSpecial Weather StatementBOXEssex33 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2012Severe Thunderstorm Warnings in Massachusetts, 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.