Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 72, NWS Boston/Norton, MA

July 23, 2011Nantucket County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 23, 2011, 1:32 PM EDT for Nantucket County, Massachusetts. It was in force for 43 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, 1:32 PM EDT (17:32 UTC)
Expired
Jul 23, 2011, 2:15 PM EDT
In force
43 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

County Nantucket County, MA

The radar

The Boston radar (KBOX), 111 km from the middle of the area, began a volume at 17:34 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, 1:50 PM EDTTSTM WND DMGNantucket, MASHINGLES BLOWN OFF HOUSE ON BARRETT FARM ROAD

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, 5.5 hours before the alert went out and 41 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.

449 
WUUS51 KBOX 231732
SVRBOX
MAC019-231815-
/O.NEW.KBOX.SV.W.0072.110723T1732Z-110723T1815Z/

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

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NANTUCKET COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITY OF NANTUCKET...

* UNTIL 215 PM EDT

* AT 129 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 12 MILES NORTHWEST OF           
  NANTUCKET...AND WAS MOVING EAST AT 45 MPH. THIS STORM WILL IMPACT  
  NANTUCKET WITH DAMAGING WINDS BETWEEN 140 PM AND 215 PM.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT LIGHTNING WAS
OCCURRING WITH THIS STORM. GET INDOORS OR INSIDE A VEHICLE NOW! DO
NOT SEEK SHELTER UNDER TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 4123 7001 4125 7019 4128 7026 4132 7028
      4134 7032 4134 7029 4132 7028 4129 7022
      4130 7019 4131 7008 4134 7004 4137 7003
      4139 7006 4140 7005 4137 7001 4126 6995
TIME...MOT...LOC 1731Z 283DEG 37KT 4137 7027

$$

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, 11:02 AM EDTSevere Thunderstorm WarningBOXPlymouth28 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, 1:44 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.