Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 70, NWS Boston/Norton, MA

July 23, 2011Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 23, 2011, 11:02 AM EDT for Plymouth County, Massachusetts. It was in force for 28 min. 1 report 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 23, 2011, 11:02 AM EDT (15:02 UTC)
Expired
Jul 23, 2011, 11:30 AM EDT
In force
28 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

County Plymouth County, MA

The radar

The Boston radar (KBOX), 40 km from the middle of the area, began a volume at 15:06 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
Jul 23, 11:15 AM EDTTSTM WND DMGDuxbury, MAMULTIPLE TREES DOWN ON STANDISH ROAD AND CHESTNUT STREET AND TREE DOWN ON A HOUSE

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, 3.0 hours before the alert went out and 72 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 2011-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2396 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
143 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.

977 
WUUS51 KBOX 231502
SVRBOX
MAC023-231530-
/O.NEW.KBOX.SV.W.0070.110723T1502Z-110723T1530Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
1102 AM EDT SAT JUL 23 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 1130 AM EDT

* AT 1056 AM 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 PEMBROKE...OR 10 MILES
  NORTHWEST OF PLYMOUTH...AND WAS MOVING EAST AT 30 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...MARSHFIELD AND DUXBURY.

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 4201 7060 4201 7062 4204 7065 4203 7066
      4201 7067 4203 7083 4211 7082 4214 7068
      4211 7065 4208 7063 4206 7064
TIME...MOT...LOC 1501Z 270DEG 26KT 4207 7076

$$

THOMPSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 3:38 AM EDTHeat AdvisoryBOXBristol, Hampden, Hampshire, Middlesex, Norfolk, Plymouth and 2 more13 hr
Jul 23, 4:58 AM EDTSpecial Weather StatementBOXFranklin32 min
Jul 23, 6:36 AM EDTSpecial Weather StatementBOXMiddlesex24 min
Jul 23, 6:39 AM EDTSpecial Weather StatementBOXFranklin36 min
Jul 23, 6:52 AM EDTSpecial Weather StatementBOXFranklin23 min
Jul 23, 7:29 AM EDTSpecial Weather StatementBOXWorcester31 min
Jul 23, 8:15 AM EDTSpecial Weather StatementBOXMiddlesex, Norfolk, Suffolk45 min
Jul 23, 9:14 AM EDTSpecial Weather StatementBOXNorfolk46 min
Jul 23, 9:45 AM EDTSpecial Weather StatementBOXSuffolk45 min
Jul 23, 10:00 AM EDTSpecial Weather StatementBOXNorfolk45 min
Jul 23, 10:14 AM EDTSpecial Marine WarningBOX26 min
Jul 23, 10:21 AM EDTSevere Thunderstorm WarningBOXNorfolk, Plymouth39 min
Jul 23, 10:45 AM EDTSpecial Marine WarningBOX45 min
Jul 23, 10:50 AM EDTSevere Thunderstorm WarningBOXPlymouth55 min
Jul 23, 11:16 AM EDTSpecial Marine WarningBOX59 min
Jul 23, 11:28 AM EDTSpecial Marine WarningBOX62 min
Jul 23, 11:38 AM EDTSpecial Weather StatementBOXPlymouth37 min
Jul 23, 11:56 AM EDTSpecial Weather StatementBOXBristol64 min
Jul 23, 12:00 PM EDTSpecial Marine WarningBOX30 min
Jul 23, 12:15 PM EDTSpecial Marine WarningBOX45 min
Jul 23, 12:20 PM EDTSpecial Weather StatementBOXPlymouth40 min
Jul 23, 12:32 PM EDTSpecial Marine WarningBOX43 min
Jul 23, 12:46 PM EDTSpecial Marine WarningBOX32 min
Jul 23, 1:01 PM EDTSevere Thunderstorm WarningBOXBarnstable, Dukes29 min
Jul 23, 1:09 PM EDTSpecial Marine WarningBOX51 min
Jul 23, 1:32 PM EDTSevere Thunderstorm WarningBOXNantucket43 min
Jul 23, 1:44 PM EDTSpecial Marine WarningBOX61 min
Jul 23, 2:07 PM EDTSpecial Marine WarningBOX38 min
Jul 23, 2:14 PM EDTSpecial Weather StatementBOXBarnstable31 min
Jul 23, 2:29 PM EDTSpecial Marine WarningBOX31 min
Jul 23, 2:51 PM EDTSpecial Marine WarningBOX39 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2011Every 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.