Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 65, NWS Boston/Norton, MA

July 24, 20124 counties in Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 24, 2012, 9:05 PM EDT for 4 counties in Massachusetts. It was in force for 40 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 24, 2012, 9:05 PM EDT (01:05 UTC)
Expired
Jul 24, 2012, 9:45 PM EDT
In force
40 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA

The radar

The Boston radar (KBOX), 41 km from the middle of the area, began a volume at 01:06 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 24, 9:24 PM EDTHAIL 1.75Scituate, MAHAM RADIO

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 00:00Z, 1.1 hours before the alert went out and 100 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 00:00Z on 2012-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 266 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 00:00Z on 2012-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -115 square meters per square second.19395878Sfc1 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
266 J/kg
Mixed-layer CIN
-194 J/kg
Mixed-layer LCL
1450 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
-115 m²/s²
0-3 km storm-relative helicity
-87 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.

793 
WUUS51 KBOX 250105
SVRBOX
MAC017-021-023-025-250145-
/O.NEW.KBOX.SV.W.0065.120725T0105Z-120725T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
905 PM EDT TUE JUL 24 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NORFOLK COUNTY IN EASTERN MASSACHUSETTS...
  EAST CENTRAL SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...
  EXTREME SOUTHEASTERN MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
  NORTH CENTRAL PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 945 PM EDT

* AT 902 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HULL...OR 6 MILES EAST OF QUINCY...AND WAS MOVING SOUTHEAST AT 30
  MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...HINGHAM...COHASSET...
  NORWELL AND SCITUATE.

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 4207 7064 4227 7097 4229 7098 4230 7102
      4233 7099 4233 7094 4235 7097 4236 7096
      4232 7091 4232 7089 4234 7090 4235 7087
      4232 7089 4228 7086 4224 7074 4217 7071
      4209 7063
TIME...MOT...LOC 0105Z 308DEG 24KT 4228 7087

$$

FRANK
1 follow-up statement
271 
WWUS51 KBOX 250120
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
920 PM EDT TUE JUL 24 2012

MAC017-025-250129-
/O.CAN.KBOX.SV.W.0065.000000T0000Z-120725T0145Z/
MIDDLESEX MA-SUFFOLK MA-
920 PM EDT TUE JUL 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SUFFOLK AND
EXTREME SOUTHEASTERN MIDDLESEX COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED OUT OF 
THE REGION.  THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN 
CANCELLED.

LAT...LON 4207 7064 4224 7092 4226 7091 4227 7091
      4229 7088 4229 7089 4229 7090 4232 7091
      4228 7088 4232 7089 4228 7087 4232 7089
      4228 7086 4224 7074 4217 7071 4209 7063
TIME...MOT...LOC 0119Z 308DEG 24KT 4222 7077

$$

MAC021-023-250145-
/O.CON.KBOX.SV.W.0065.000000T0000Z-120725T0145Z/
NORFOLK MA-PLYMOUTH MA-
920 PM EDT TUE JUL 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR NORTH CENTRAL PLYMOUTH AND EXTREME NORTHEASTERN NORFOLK
COUNTIES...

AT 914 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE 
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR COHASSET...OR 8 MILES EAST OF WEYMOUTH...MOVING 
SOUTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORWELL
AND SCITUATE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4207 7064 4224 7092 4226 7091 4227 7091
      4229 7088 4229 7089 4229 7090 4232 7091
      4228 7088 4232 7089 4228 7087 4232 7089
      4228 7086 4224 7074 4217 7071 4209 7063
TIME...MOT...LOC 0119Z 308DEG 24KT 4222 7077

$$

FRANK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 9:01 PM EDTSpecial Marine WarningBOX59 min
Jul 24, 9:31 PM EDTSpecial Marine WarningBOX59 min
Jul 24, 9:36 PM EDTSpecial Weather StatementBOXPlymouth39 min
Jul 24, 9:42 PM EDTSevere Thunderstorm WarningBOXPlymouth48 min
Jul 24, 9:48 PM EDTSpecial Marine WarningBOX57 min
Jul 24, 10:27 PM EDTSpecial Marine WarningBOX63 min
Jul 24, 10:36 PM EDTSpecial Marine WarningBOX27 min
Jul 24, 11:51 PM EDTSpecial Marine WarningBOX54 min
Jul 25, 12:33 AM EDTSpecial Marine WarningBOX57 min
Jul 25, 4:35 PM EDTSmall Craft AdvisoryBOX35 hr

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.