Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 31, NWS Boston/Norton, MA

June 23, 2012Norfolk County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 23, 2012, 6:06 PM EDT for Norfolk County, Plymouth County, Massachusetts. It was in force for 39 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
Jun 23, 2012, 6:06 PM EDT (22:06 UTC)
Expired
Jun 23, 2012, 6:45 PM EDT
In force
39 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Norfolk County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 39 km from the middle of the area, began a volume at 22:06 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
Jun 23, 6:10 PM EDTTSTM WND DMGCohasset, MATREES AND WIRES DOWN IN MULTIPLE LOCATIONS THROUGHOUT THE TOWN
Jun 23, 6:15 PM EDTTSTM WND DMGScituate, MALARGE TREE LIMB DOWN ON WIRES ON SOUTH MAIN STREET. LARGE LIMBS AND WIRES DOWN IN MULTIPLE LOCATIONS THROUGHOUT TOWN.

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, 10.1 hours before the alert went out and 87 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 12:00Z on 2012-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 365 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 12:00Z on 2012-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.193958Sfc1 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
365 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
949 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
71 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.

251 
WUUS51 KBOX 232206
SVRBOX
MAC021-023-232245-
/O.NEW.KBOX.SV.W.0031.120623T2206Z-120623T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
606 PM EDT SAT JUN 23 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL NORFOLK COUNTY IN EASTERN MASSACHUSETTS...
  NORTHERN PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 645 PM EDT

* AT 601 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM HINGHAM TO ROCKLAND TO
  WHITMAN...OR ALONG A LINE EXTENDING FROM WEYMOUTH TO BROCKTON...AND
  WAS MOVING EAST AT 15 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...COHASSET...NORWELL...
  HANSON...HANOVER...SCITUATE...PEMBROKE AND MARSHFIELD.

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 4205 7064 4206 7099 4213 7100 4227 7086
      4227 7081 4226 7078 4226 7077 4225 7076
      4224 7074 4223 7075 4221 7071 4217 7071
      4209 7063
TIME...MOT...LOC 2206Z 266DEG 13KT 4225 7086 4214 7087
          4209 7094

$$

SIPPRELL

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 23, 3:22 PM EDTSpecial Weather StatementBOXFranklin38 min
Jun 23, 3:52 PM EDTSpecial Weather StatementBOXFranklin38 min
Jun 23, 4:23 PM EDTSpecial Weather StatementBOXEssex52 min
Jun 23, 4:30 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex35 min
Jun 23, 4:42 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Suffolk48 min
Jun 23, 4:56 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Norfolk, Suffolk49 min
Jun 23, 4:57 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex33 min
Jun 23, 5:01 PM EDTSpecial Marine WarningBOX89 min
Jun 23, 5:09 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Norfolk, Suffolk36 min
Jun 23, 5:19 PM EDTAreal Flood AdvisoryBOXEssex, Middlesex, Norfolk, Plymouth, Suffolk4 hr
Jun 23, 5:22 PM EDTSevere Thunderstorm WarningBOXNorfolk, Plymouth, Suffolk53 min
Jun 23, 5:26 PM EDTSevere Thunderstorm WarningBOXBristol35 min
Jun 23, 5:27 PM EDTSpecial Marine WarningBOX33 min
Jun 23, 5:52 PM EDTSpecial Marine WarningBOX30 min
Jun 23, 5:55 PM EDTSpecial Marine WarningBOX65 min
Jun 23, 6:10 PM EDTSevere Thunderstorm WarningBOXBristol31 min
Jun 23, 6:11 PM EDTSpecial Marine WarningBOX26 min
Jun 23, 6:29 PM EDTSpecial Weather StatementBOXBristol, Plymouth46 min
Jun 23, 6:35 PM EDTSpecial Marine WarningBOX55 min
Jun 23, 6:45 PM EDTSpecial Weather StatementBOXBarnstable, Dukes90 min
Jun 23, 7:26 PM EDTSpecial Marine WarningBOX40 min

Nearby

Severe 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.