Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 27, NWS Boston/Norton, MA

June 23, 20124 counties in Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 23, 2012, 5:09 PM EDT for 4 counties in Massachusetts. It was in force for 36 min. 3 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, 5:09 PM EDT (21:09 UTC)
Expired
Jun 23, 2012, 5:45 PM EDT
In force
36 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Essex County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA

The radar

The Boston radar (KBOX), 51 km from the middle of the area, began a volume at 21:10 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, 5:19 PM EDTMARINE TSTM WIND 441 N East Boston, MA
Jun 23, 5:43 PM EDTTSTM WND DMGMelrose, MACAR STUCK IN FLOOD WATERS UNDER RAILROAD BRIDGE... PERSON TRAPPED IN VEHICLE AND RESCUED
Jun 23, 5:49 PM EDTTSTM WND DMGMedford, MATUFTS UNIVERSITY ROAD NEAR PD HQ FLOODED AND IMPASSABLE

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, 9.2 hours before the alert went out and 116 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.

955 
WUUS51 KBOX 232109
SVRBOX
MAC009-017-021-025-232145-
/O.NEW.KBOX.SV.W.0027.120623T2109Z-120623T2145Z/

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

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL ESSEX COUNTY IN EASTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF LYNN...
  EXTREME NORTH CENTRAL NORFOLK COUNTY IN EASTERN MASSACHUSETTS...
  NORTHERN SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...
  EAST CENTRAL MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...SOMERVILLE...CAMBRIDGE...

* UNTIL 545 PM EDT

* AT 505 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 WOBURN TO ARLINGTON TO 6 MILES
  SOUTHWEST OF WATERTOWN...OR ALONG A LINE EXTENDING FROM 10 MILES
  SOUTHEAST OF LOWELL TO SOMERVILLE TO NEWTON...AND WAS MOVING EAST
  AT 20 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...MEDFORD...STONEHAM...
  MALDEN...EVERETT...MELROSE...WAKEFIELD...CHELSEA...SAUGUS...
  REVERE...WINTHROP...PEABODY...NAHANT AND SWAMPSCOTT.

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 4247 7087 4245 7093 4243 7090 4241 7091
      4242 7094 4245 7095 4241 7098 4233 7095
      4232 7097 4234 7095 4235 7099 4233 7098
      4232 7099 4234 7100 4232 7104 4233 7121
      4251 7115 4255 7097
TIME...MOT...LOC 2109Z 274DEG 17KT 4254 7114 4241 7112
          4229 7122

$$

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, 5:19 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, 6:06 PM EDTSevere Thunderstorm WarningBOXNorfolk, Plymouth39 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.