Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 118, NWS Boston/Norton, MA

October 30, 20124 counties in Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Oct 30, 2012, 7:39 PM EDT for 4 counties in Massachusetts. It was in force for 51 min. 7 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: Oct 30, 2012, 7:39 PM EDT (23:39 UTC)
Expired: Oct 30, 2012, 8:30 PM EDT
In force: 51 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Barnstable County, MA, Bristol County, MA, Norfolk County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 39 km from the middle of the area, began a volume at 23:39 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
Oct 30, 7:40 PM EDT	TSTM WND DMG	Wareham, MA	MICROBURST APPROXIMATELY 100 TREES SIGNIFICANTLY DAMAGED OR KNOCKED DOWN. SEE PNSBOX FOR MORE DETAILS.
Oct 30, 7:55 PM EDT	TSTM WND DMG	Wareham, MA	TREES AND WIRES DOWN ON SWIFT AVE.
Oct 30, 8:00 PM EDT	TSTM WND DMG	Plymouth, MA	MULTIPLE TREES DOWN
Oct 30, 8:00 PM EDT	TSTM WND DMG	Wareham, MA	HIGH AND SAWYER STREETS BLOCKED BY TREES WITH WIRES DOWN
Oct 30, 8:05 PM EDT	TSTM WND DMG	Kingston, MA	TREE AND WIRES DOWN
Oct 30, 8:05 PM EDT	TSTM WND DMG	Wareham, MA	REPORTS OF SEVERAL CAPSIZED BOATS IN POINT DEPENDENCE OFF OF ONSET
Oct 30, 8:10 PM EDT	TSTM WND DMG	Wareham, MA	TREES DOWN ON MAIN STREET...FD ON SCENE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 11.7 hours before the alert went out and 63 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: 54 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 914 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

389 
WUUS51 KBOX 302339
SVRBOX
MAC001-005-021-023-310030-
/O.NEW.KBOX.SV.W.0118.121030T2339Z-121031T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
739 PM EDT TUE OCT 30 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHEASTERN NORFOLK COUNTY IN EASTERN MASSACHUSETTS...
  WEST CENTRAL BARNSTABLE COUNTY IN SOUTHEAST MASSACHUSETTS...
  EXTREME SOUTHEASTERN BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...
  PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITY OF PLYMOUTH...

* UNTIL 830 PM EDT

* AT 734 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 MARION...OR 10 MILES
  NORTHWEST OF FALMOUTH...AND WAS MOVING NORTH AT 50 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...WAREHAM...CARVER...
  PLYMPTON...HALIFAX...KINGSTON...DUXBURY...HANSON...PEMBROKE...
  MARSHFIELD...HANOVER...NORWELL...SCITUATE...COHASSET...HINGHAM AND
  HULL.

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.

&&

LAT...LON 4161 7059 4161 7066 4171 7067 4172 7070
      4167 7071 4168 7074 4164 7077 4165 7079
      4162 7080 4161 7085 4232 7090 4221 7071
      4201 7060 4199 7063 4204 7065 4200 7070
      4199 7069 4193 7053
TIME...MOT...LOC 2339Z 181DEG 43KT 4173 7071

$$

KJC

2 follow-up statements

932 
WWUS51 KBOX 302359
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
759 PM EDT TUE OCT 30 2012

MAC001-005-310009-
/O.CAN.KBOX.SV.W.0118.000000T0000Z-121031T0030Z/
BRISTOL MA-BARNSTABLE MA-
759 PM EDT TUE OCT 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BARNSTABLE AND
EXTREME SOUTHEASTERN BRISTOL COUNTIES IN SOUTHEAST MASSACHUSETTS IS
CANCELLED...

LAT...LON 4190 7053 4188 7054 4186 7085 4232 7090
      4221 7071 4201 7060 4199 7063 4204 7065
      4200 7070 4199 7069 4194 7055
TIME...MOT...LOC 2359Z 178DEG 44KT 4198 7073

$$

MAC021-023-310030-
/O.CON.KBOX.SV.W.0118.000000T0000Z-121031T0030Z/
NORFOLK MA-PLYMOUTH MA-
759 PM EDT TUE OCT 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHEASTERN PLYMOUTH AND EXTREME NORTHEASTERN NORFOLK
COUNTIES...

AT 756 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 PLYMOUTH...MOVING
NORTH AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
KINGSTON...DUXBURY...HANSON...PEMBROKE...MARSHFIELD...HANOVER...
NORWELL...SCITUATE...COHASSET...HINGHAM AND HULL

LAT...LON 4190 7053 4188 7054 4186 7085 4232 7090
      4221 7071 4201 7060 4199 7063 4204 7065
      4200 7070 4199 7069 4194 7055
TIME...MOT...LOC 2359Z 178DEG 44KT 4198 7073

$$

KJC

542 
WWUS51 KBOX 310025
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
825 PM EDT TUE OCT 30 2012

MAC021-023-310035-
/O.EXP.KBOX.SV.W.0118.000000T0000Z-121031T0030Z/
NORFOLK MA-PLYMOUTH MA-
825 PM EDT TUE OCT 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PLYMOUTH AND
EXTREME NORTHEASTERN NORFOLK COUNTIES WILL EXPIRE AT 830 PM EDT...

LAT...LON 4190 7053 4188 7054 4186 7085 4232 7090
      4221 7071 4201 7060 4199 7063 4204 7065
      4200 7070 4199 7069 4194 7055
TIME...MOT...LOC 0025Z 178DEG 44KT 4230 7075

$$

KJC

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 30, 12:33 AM EDT	Wind Advisory	BOX	Barnstable, Bristol, Dukes, Essex, Franklin, Hampden and 7 more	13 hr
Oct 30, 3:54 AM EDT	Coastal Flood Advisory	BOX	Barnstable, Dukes, Essex, Nantucket, Norfolk, Plymouth and 1 more	9 hr
Oct 30, 4:35 AM EDT	Gale Warning	BOX		9 hr
Oct 30, 5:30 AM EDT	Special Weather Statement	BOX	Bristol, Middlesex, Norfolk	60 min
Oct 30, 7:15 AM EDT	Special Weather Statement	BOX	Bristol, Norfolk	90 min
Oct 30, 8:18 AM EDT	Special Weather Statement	BOX	Middlesex, Norfolk	27 min
Oct 30, 1:34 PM EDT	Special Marine Warning	BOX		41 min
Oct 30, 2:03 PM EDT	Small Craft Advisory	BOX		38 hr
Oct 30, 6:19 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Worcester	3 hr
Oct 30, 6:39 PM EDT	Special Marine Warning	BOX		66 min
Oct 30, 6:59 PM EDT	Flash Flood Warning	BOX	Bristol, Plymouth	2 hr
Oct 30, 7:11 PM EDT	Areal Flood Advisory	BOX	Barnstable, Dukes	2 hr
Oct 30, 7:34 PM EDT	Special Marine Warning	BOX		56 min
Oct 30, 7:34 PM EDT	Special Weather Statement	BOX	Plymouth	41 min
Oct 30, 7:50 PM EDT	Special Marine Warning	BOX		55 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 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.