Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 116, NWS Boston/Norton, MA

September 18, 20124 counties in Massachusetts; Hillsborough County, New Hampshire; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 18, 2012, 10:16 PM EDT for 4 counties in Massachusetts; Hillsborough County, New Hampshire; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 59 min. 5 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: Sep 18, 2012, 10:16 PM EDT (02:16 UTC)
Expired: Sep 18, 2012, 11:15 PM EDT
In force: 59 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA, Hillsborough County, NH

The radar

The Boston radar (KBOX), 78 km from the middle of the area, began a volume at 02:17 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.

What was reported inside it

Time	Report	Where	Remark
Sep 18, 10:43 PM EDT	TSTM WND DMG	Tolland, CT	TREE AND WIRES DOWN ON REED RD AT TIMBER LANE. TREE AND WIRES DOWN ON WOODLAND ST.
Sep 18, 10:45 PM EDT	TSTM WND DMG	Hebron, CT	TREE DOWN ON RTE 207 NEAR THE LEBANON TOWN LINE
Sep 18, 11:04 PM EDT	TSTM WND DMG	Coventry, CT	TREE AND WIRES DOWN ON HIGH ST
Sep 18, 11:10 PM EDT	TSTM WND DMG	Vernon, CT	TREE DOWN ON WIRES ON BOLTON RD NEAR BAMFORTH RD
Sep 18, 11:14 PM EDT	TSTM WND DMG	Mansfield, CT	TREE DOWN ON PLEASANT VALLEY RD

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.

Issued	Product	Office	Lasted
Sep 18, 7:54 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 2.3 hours before the alert went out and 165 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: 47 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 47 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.

529 
WUUS51 KBOX 190216
SVRBOX
CTC003-013-015-MAC013-015-017-027-NHC011-190315-
/O.NEW.KBOX.SV.W.0116.120919T0216Z-120919T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
1016 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...WORCESTER...LEOMINSTER...FITCHBURG...
  SOUTHEASTERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF MANCHESTER...
  TOLLAND COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITIES OF...VERNON...MANSFIELD...
  WINDHAM COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITIES OF...WILLIMANTIC...PUTNAM...
  NORTHWESTERN MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
  EASTERN HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...
  THIS INCLUDES THE CITIES OF...NASHUA...MANCHESTER...
  SOUTHEASTERN HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...
  EXTREME SOUTHEASTERN HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 1115 PM EDT

* AT 1012 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 BARRE AND MONSON IN MASSACHUSETTS TO VERNON AND 
  ROCKY HILL IN CONNECTICUT.  THE STORMS WERE MOVING NORTHEAST AT 50 
  MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  MANCHESTER AND NASHUA IN NEW HAMPSHIRE...FITCHBURG AND WORCESTER  
  IN MASSACHUSETTS...PUTNAM AND STORRS AND MANCHESTER IN CONNECTICUT.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...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.

&&

LAT...LON 4305 7146 4302 7139 4294 7137 4291 7144
      4284 7143 4279 7136 4165 7204 4166 7217
      4171 7224 4159 7234 4158 7247 4164 7251
      4163 7268 4257 7209 4275 7179 4306 7162
      4307 7152
TIME...MOT...LOC 0212Z 221DEG 58KT 4237 7211 4108 7293

$$

WTB

2 follow-up statements

255 
WWUS51 KBOX 190255
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1055 PM EDT TUE SEP 18 2012

CTC003-013-015-MAC013-015-017-027-NHC011-190315-
/O.CON.KBOX.SV.W.0116.000000T0000Z-120919T0315Z/
HARTFORD CT-TOLLAND CT-WINDHAM CT-MIDDLESEX MA-WORCESTER MA-
HAMPSHIRE MA-HILLSBOROUGH NH-HAMPDEN MA-
1055 PM EDT TUE SEP 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR SOUTHEASTERN HAMPDEN...EASTERN HILLSBOROUGH...EXTREME
SOUTHEASTERN HAMPSHIRE...WORCESTER...NORTHWESTERN MIDDLESEX...
WINDHAM...TOLLAND AND SOUTHEASTERN HARTFORD COUNTIES...

AT 1048 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 HOLLIS NEW HAMPSHIRE THROUGH STURBRIDGE 
MASSACHUSETTS TO COVENTRY CONNECTICUT...MOVING NORTHEAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
FITCHBURG...WORCESTER...PUTNAM AND WILLIMANTIC.

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 4305 7146 4302 7139 4294 7137 4291 7144
      4284 7143 4279 7136 4165 7204 4166 7217
      4171 7224 4159 7234 4158 7247 4164 7251
      4163 7268 4257 7209 4275 7179 4306 7162
      4307 7152
TIME...MOT...LOC 0252Z 221DEG 58KT 4285 7152 4157 7237

$$

WTB

255 
WWUS51 KBOX 190306
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1106 PM EDT TUE SEP 18 2012

CTC003-013-015-MAC013-015-017-027-NHC011-190315-
/O.CON.KBOX.SV.W.0116.000000T0000Z-120919T0315Z/
HARTFORD CT-TOLLAND CT-WINDHAM CT-MIDDLESEX MA-WORCESTER MA-
HAMPSHIRE MA-HILLSBOROUGH NH-HAMPDEN MA-
1106 PM EDT TUE SEP 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR SOUTHEASTERN HAMPDEN...EASTERN HILLSBOROUGH...EXTREME
SOUTHEASTERN HAMPSHIRE...WORCESTER...NORTHWESTERN MIDDLESEX...
WINDHAM...TOLLAND AND SOUTHEASTERN HARTFORD COUNTIES...

AT 1059 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
STRONG THUNDERSTORM NEAR UNION CONNECTICUT MOVING NORTHEAST AT 50 
MPH.  THIS PARTICULAR THUNDERSTORM WAS SHOWING SOME SIGNS OF 
ROTATION...ALTHOUGH SPREAD OVER A BROAD AREA.  THIS THUNDERSTORM 
WILL CROSS STURBRIDGE AND SOUTHBRIDGE MASSACHUSETTS BY 1130 PM.

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 4305 7146 4302 7139 4294 7137 4291 7144
      4284 7143 4279 7136 4165 7204 4166 7217
      4171 7224 4159 7234 4158 7247 4164 7251
      4163 7268 4257 7209 4275 7179 4306 7162
      4307 7152
TIME...MOT...LOC 0302Z 221DEG 58KT 4297 7137 4169 7223

$$

WTB

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 8:18 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	57 min
Sep 18, 8:52 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire, Worcester	5 hr
Sep 18, 9:16 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Middlesex, Worcester	59 min
Sep 18, 10:34 PM EDT	Special Weather Statement	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	86 min
Sep 18, 11:16 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Worcester	59 min
Sep 18, 11:27 PM EDT	Areal Flood Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more	6 hr
Sep 19, 12:27 AM EDT	Areal Flood Warning	BOX	Hampshire	80 min
Sep 19, 12:37 AM EDT	Special Marine Warning	BOX		83 min
Sep 19, 12:49 AM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	56 min
Sep 19, 1:01 AM EDT	Special Marine Warning	BOX		59 min
Sep 19, 1:35 AM EDT	Special Marine Warning	BOX		85 min
Sep 19, 1:59 AM EDT	Special Marine Warning	BOX		61 min
Sep 19, 2:18 AM EDT	Special Weather Statement	BOX	Barnstable, Bristol, Plymouth	87 min
Sep 19, 4:07 AM EDT	High Surf Advisory	BOX	Dukes, Nantucket	12 hr
Sep 19, 5:50 AM EDT	Small Craft Advisory	BOX		22 hr
Sep 18, 8:34 PM EDT	Severe Thunderstorm Warning	BOX	Cheshire, Hillsborough	56 min
Sep 18, 9:31 PM EDT	Severe Thunderstorm Warning	BOX	Cheshire, Hillsborough	59 min
Sep 19, 3:41 AM EDT	Frost Advisory	BOX	Cheshire	28 hr

Nearby

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