Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 55, NWS Boston/Norton, MA

July 6, 2011Franklin County, Middlesex County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 6, 2011, 7:26 PM EDT for Franklin County, Middlesex County, Worcester County, Massachusetts. It was in force for 36 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 6, 2011, 7:26 PM EDT (23:26 UTC)
Expired: Jul 6, 2011, 8:02 PM EDT
In force: 36 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Franklin County, MA, Middlesex County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 118 km from the middle of the area, began a volume at 23:29 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
Jul 6, 7:35 PM EDT	TSTM WND DMG	Erving, MA	TREE AND WIRES DOWN ON PROSPECT HEIGHTS LANE
Jul 6, 7:35 PM EDT	TSTM WND DMG	New Salem, MA	TREE DOWN BLOCKING ELM STREET

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
Jul 6, 1:29 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 11.4 hours before the alert went out and 130 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1486 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 69 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.

673 
WUUS51 KBOX 062326
SVRBOX
MAC011-017-027-070030-
/O.NEW.KBOX.SV.W.0055.110706T2326Z-110707T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
726 PM EDT WED JUL 6 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  THIS INCLUDES THE CITY OF FITCHBURG...
  EXTREME NORTHWESTERN MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
  EASTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF GREENFIELD...

* UNTIL 830 PM EDT

* AT 725 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 GILL...OR NEAR
  GREENFIELD...AND WAS MOVING EAST AT 30 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...NORTHFIELD...WENDELL...
  ERVING...NEW SALEM...WARWICK...ORANGE...ATHOL...ROYALSTON...
  PHILLIPSTON...TEMPLETON...WINCHENDON...GARDNER...WESTMINSTER...
  ASHBURNHAM AND ASHBY.

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 900 PM EDT
WEDNESDAY EVENING FOR NORTHERN CONNECTICUT AND WESTERN MASSACHUSETTS
AND SOUTHERN NEW HAMPSHIRE.

&&

LAT...LON 4272 7231 4271 7178 4250 7178 4250 7262
      4269 7262
TIME...MOT...LOC 2326Z 267DEG 27KT 4261 7248

$$

FRANK

2 follow-up statements

776 
WWUS51 KBOX 062349
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
749 PM EDT WED JUL 6 2011

MAC011-062359-
/O.CAN.KBOX.SV.W.0055.000000T0000Z-110707T0030Z/
FRANKLIN MA-
749 PM EDT WED JUL 6 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FRANKLIN COUNTY IS
CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
WEDNESDAY EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE.

LAT...LON 4271 7178 4250 7178 4250 7226 4252 7225
      4254 7227 4258 7228 4258 7226 4260 7227
      4261 7226 4262 7223 4266 7223 4268 7227
      4272 7228
TIME...MOT...LOC 2349Z 269DEG 56KT 4261 7198

$$

MAC017-027-070030-
/O.CON.KBOX.SV.W.0055.000000T0000Z-110707T0030Z/
MIDDLESEX MA-WORCESTER MA-
749 PM EDT WED JUL 6 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHWESTERN WORCESTER AND EXTREME NORTHWESTERN MIDDLESEX
COUNTIES...

AT 746 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 GARDNER...OR 12 MILES
WEST OF FITCHBURG...MOVING EAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WESTMINSTER...ASHBURNHAM AND ASHBY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
WEDNESDAY EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE.

&&

LAT...LON 4271 7178 4250 7178 4250 7226 4252 7225
      4254 7227 4258 7228 4258 7226 4260 7227
      4261 7226 4262 7223 4266 7223 4268 7227
      4272 7228
TIME...MOT...LOC 2349Z 269DEG 56KT 4261 7198

$$

FRANK

769 
WWUS51 KBOX 070002
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
802 PM EDT WED JUL 6 2011

MAC017-027-070010-
/O.CAN.KBOX.SV.W.0055.000000T0000Z-110707T0030Z/
MIDDLESEX MA-WORCESTER MA-
802 PM EDT WED JUL 6 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WORCESTER AND
EXTREME NORTHWESTERN MIDDLESEX COUNTIES IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED.  
THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.  
BRIEF HEAVY RAIN AND LIGHTNING REMAINS POSSIBLE WITH THE STORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
WEDNESDAY EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE.

LAT...LON 4271 7178 4250 7178 4250 7226 4252 7225
      4254 7227 4258 7228 4258 7226 4260 7227
      4261 7226 4262 7223 4266 7223 4268 7227
      4272 7228
TIME...MOT...LOC 0000Z 269DEG 56KT 4261 7175

$$

FRANK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 4:53 PM EDT	Special Weather Statement	BOX	Franklin	37 min
Jul 6, 5:16 PM EDT	Special Weather Statement	BOX	Franklin	29 min
Jul 6, 6:23 PM EDT	Special Weather Statement	BOX	Franklin	67 min
Jul 6, 6:34 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	56 min
Jul 6, 6:47 PM EDT	Special Weather Statement	BOX	Hampshire	58 min
Jul 6, 6:54 PM EDT	Severe Thunderstorm Warning	BOX	Hampshire	66 min
Jul 6, 7:39 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	66 min
Jul 6, 7:59 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	46 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.