Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 117, NWS Boston/Norton, MA

September 18, 20124 states

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 18, 2012, 11:16 PM EDT for 4 states. It was in force for 59 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
Sep 18, 2012, 11:16 PM EDT (03:16 UTC)
Expired
Sep 19, 2012, 12:15 AM EDT
In force
59 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Northeastern Connecticut Planning Region, CT, Essex County, MA, Middlesex County, MA, Norfolk County, MA, Worcester County, MA, Hillsborough County, NH, Kent County, RI, Providence County, RI

The radar

The Boston radar (KBOX), 56 km from the middle of the area, began a volume at 03:16 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
Sep 18, 11:34 PM EDTTSTM WND DMGWillimantic, CTTREE 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.

IssuedProductOfficeLasted
Sep 18, 7:54 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 00:00Z, 3.3 hours before the alert went out and 153 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, Chatham, MA at 00:00Z on 2012-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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, Chatham, MA at 00:00Z on 2012-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 264 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
4 J/kg
Mixed-layer CIN
-158 J/kg
Mixed-layer LCL
793 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
264 m²/s²
0-3 km storm-relative helicity
278 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.

295 
WUUS51 KBOX 190316
SVRBOX
CTC013-015-MAC009-017-021-027-NHC011-RIC003-007-190415-
/O.NEW.KBOX.SV.W.0117.120919T0316Z-120919T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
1116 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN KENT COUNTY IN RHODE ISLAND...
  WESTERN PROVIDENCE COUNTY IN RHODE ISLAND...
  THIS INCLUDES THE CITY OF WOONSOCKET...
  EASTERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...WORCESTER...MILFORD...LEOMINSTER...
  WEST CENTRAL ESSEX COUNTY IN EASTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF LAWRENCE...
  WESTERN NORFOLK COUNTY IN EASTERN MASSACHUSETTS...
  EASTERN TOLLAND COUNTY IN NORTHERN CONNECTICUT...
  WINDHAM COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITIES OF...WILLIMANTIC...PUTNAM...PLAINFIELD...
  MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...LOWELL...FRAMINGHAM...
  SOUTHEASTERN HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...
  THIS INCLUDES THE CITY OF NASHUA...

* UNTIL 1215 AM EDT

* AT 1112 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING 
  WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
  EXTENDING FROM TOWNSEND THROUGH LEICESTER AND WEBSTER TO 
  WILLIMANTIC...AND WERE MOVING NORTHEAST AT 50 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  NASHUA...LOWELL...LAWRENCE...WORCESTER...FRAMINGHAM AND PUTNAM.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...AS WELL
AS DEADLY LIGHTNING AND TORRENTIAL RAIN. GET TO SAFE SHELTER NOW...
INSIDE A STURDY BUILDING OR IN A VEHICLE. DO NOT SEEK SHELTER UNDER
TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. DRIVERS SHOULD BE ALERT FOR PONDING OF WATER AND AVOID
FLOODED ROADS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM EDT
WEDNESDAY MORNING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND.

&&

LAT...LON 4290 7144 4284 7143 4278 7134 4275 7125
      4274 7119 4279 7119 4282 7116 4281 7108
      4263 7112 4164 7170 4160 7179 4164 7181
      4163 7196 4166 7217 4171 7223 4188 7212
      4209 7211 4262 7179 4295 7137
TIME...MOT...LOC 0312Z 223DEG 46KT 4265 7166 4223 7189           
4202 7190 4107 

$$

WTB
1 follow-up statement
066 
WWUS51 KBOX 190345
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1145 PM EDT TUE SEP 18 2012

CTC013-015-MAC009-017-021-027-NHC011-RIC003-007-190415-
/O.CON.KBOX.SV.W.0117.000000T0000Z-120919T0415Z/
TOLLAND CT-WINDHAM CT-MIDDLESEX MA-WORCESTER MA-NORFOLK MA-
HILLSBOROUGH NH-PROVIDENCE RI-ESSEX MA-KENT RI-
1145 PM EDT TUE SEP 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT
FOR WESTERN KENT...WEST CENTRAL ESSEX...WESTERN PROVIDENCE...
SOUTHEASTERN HILLSBOROUGH...WESTERN NORFOLK...EASTERN WORCESTER...
MIDDLESEX...WINDHAM AND EASTERN TOLLAND COUNTIES...

AT 1142 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LINE OF SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING 
DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG 
A LINE EXTENDING FROM NASHUA THROUGH DOUGLAS TO PUTNAM...MOVING 
NORTHEAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LOWELL...LAWRENCE...CONCORD...MILFORD...BURRILLVILLE AND KILLINGLY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM EDT
WEDNESDAY MORNING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND.

&&

LAT...LON 4290 7144 4284 7143 4278 7134 4275 7125
      4274 7119 4279 7119 4282 7116 4281 7108
      4263 7112 4164 7170 4160 7179 4164 7181
      4163 7196 4166 7217 4171 7223 4188 7212
      4209 7211 4262 7179 4295 7137
TIME...MOT...LOC 0341Z 223DEG 46KT 4292 7131 4250 7154
          4229 7156

$$

WTB

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 10:34 PM EDTSpecial Weather StatementBOXBristol, Kent, Providence, Washington86 min
Sep 18, 11:27 PM EDTAreal Flood AdvisoryBOXBristol, Kent, Newport, Providence, Washington6 hr
Sep 19, 12:49 AM EDTSpecial Weather StatementBOXKent, Providence56 min
Sep 19, 2:18 AM EDTSpecial Weather StatementBOXNewport87 min
Sep 18, 8:18 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire57 min
Sep 18, 8:52 PM EDTAreal Flood AdvisoryBOXFranklin, Hampden, Hampshire, Worcester5 hr
Sep 18, 9:16 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Middlesex, Worcester59 min
Sep 18, 10:16 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire, Middlesex, Worcester59 min
Sep 19, 12:27 AM EDTAreal Flood WarningBOXHampshire80 min
Sep 19, 12:37 AM EDTSpecial Marine WarningBOX83 min
Sep 19, 1:01 AM EDTSpecial Marine WarningBOX59 min
Sep 19, 1:35 AM EDTSpecial Marine WarningBOX85 min
Sep 19, 1:59 AM EDTSpecial Marine WarningBOX61 min
Sep 19, 4:07 AM EDTHigh Surf AdvisoryBOXDukes, Nantucket12 hr
Sep 19, 5:50 AM EDTSmall Craft AdvisoryBOX22 hr
Sep 18, 8:34 PM EDTSevere Thunderstorm WarningBOXCheshire, Hillsborough56 min
Sep 18, 9:31 PM EDTSevere Thunderstorm WarningBOXCheshire, Hillsborough59 min
Sep 19, 3:41 AM EDTFrost AdvisoryBOXCheshire28 hr

Nearby

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