Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 66, NWS Boston/Norton, MA

July 24, 2012Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 24, 2012, 9:42 PM EDT for Plymouth County, Massachusetts. It was in force for 48 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, 9:42 PM EDT (01:42 UTC)
Expired: Jul 24, 2012, 10:30 PM EDT
In force: 48 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

County Plymouth County, MA

The radar

The Boston radar (KBOX), 42 km from the middle of the area, began a volume at 01:44 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

Time	Report	Where	Remark
Jul 24, 10:09 PM EDT	HAIL 0.75	Plymouth, MA	HAM 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, 1.7 hours before the alert went out and 66 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

720 
WUUS51 KBOX 250142
SVRBOX
MAC023-250230-
/O.NEW.KBOX.SV.W.0066.120725T0142Z-120725T0230Z/

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

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

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

* UNTIL 1030 PM EDT

* AT 940 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
  DUXBURY...OR 7 MILES NORTH OF PLYMOUTH...AND WAS MOVING SOUTHEAST
  AT 35 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...KINGSTON.

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 4183 7053 4201 7085 4221 7076 4219 7071
      4209 7063 4206 7064 4201 7060 4199 7062
      4204 7065 4200 7067 4200 7070 4197 7066
      4198 7065 4195 7062 4196 7058 4193 7053
      4185 7052
TIME...MOT...LOC 0142Z 299DEG 30KT 4204 7069

$$

FRANK

3 follow-up statements

152 
WWUS51 KBOX 250147
SVSBOX

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

MAC023-250230-
/O.CON.KBOX.SV.W.0066.000000T0000Z-120725T0230Z/
PLYMOUTH MA-
947 PM EDT TUE JUL 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR EAST CENTRAL PLYMOUTH COUNTY...

AT 944 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 DUXBURY...OR NEAR PLYMOUTH...MOVING SOUTHEAST AT 35 MPH.

EARLIER...AT 924 PM A HAM RADIO OPERATOR REPORTED GOLF BALL SIZE 
HAIL IN THE NORTHERN PART OF 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 4183 7053 4201 7084 4212 7072 4215 7069
      4209 7063 4206 7064 4201 7060 4199 7062
      4204 7065 4200 7067 4200 7070 4197 7066
      4198 7065 4195 7062 4196 7058 4193 7053
      4185 7052
TIME...MOT...LOC 0146Z 299DEG 30KT 4202 7065

$$

FRANK

393 
WWUS51 KBOX 250202
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1002 PM EDT TUE JUL 24 2012

MAC023-250230-
/O.CON.KBOX.SV.W.0066.000000T0000Z-120725T0230Z/
PLYMOUTH MA-
1002 PM EDT TUE JUL 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR EAST CENTRAL PLYMOUTH COUNTY...

AT 957 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 7 MILES EAST OF PLYMOUTH...MOVING SOUTHEAST AT 35 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4183 7053 4197 7077 4204 7069 4209 7069
      4209 7063 4206 7064 4201 7060 4199 7062
      4204 7065 4200 7067 4200 7070 4197 7066
      4198 7065 4195 7062 4196 7058 4193 7053
      4185 7052
TIME...MOT...LOC 0202Z 299DEG 30KT 4196 7049

$$

FRANK

865 
WWUS51 KBOX 250221
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1021 PM EDT TUE JUL 24 2012

MAC023-250231-
/O.EXP.KBOX.SV.W.0066.000000T0000Z-120725T0230Z/
PLYMOUTH MA-
1021 PM EDT TUE JUL 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PLYMOUTH COUNTY
WILL EXPIRE AT 1030 PM EDT...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING WAS MOVING OUT OF 
THE REGION.  THEREFORE...THE SEVERE THUNDERSTORM WARNING WILL EXPIRE 
ON TIME AT 1030 PM.

LAT...LON 4183 7053 4197 7077 4204 7069 4209 7069
      4209 7063 4206 7064 4201 7060 4199 7062
      4204 7065 4200 7067 4200 7070 4197 7066
      4198 7065 4195 7062 4196 7058 4193 7053
      4185 7052
TIME...MOT...LOC 0221Z 299DEG 30KT 4188 7030

$$

FRANK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 9:01 PM EDT	Special Marine Warning	BOX		59 min
Jul 24, 9:05 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Plymouth, Suffolk	40 min
Jul 24, 9:31 PM EDT	Special Marine Warning	BOX		59 min
Jul 24, 9:36 PM EDT	Special Weather Statement	BOX	Plymouth	39 min
Jul 24, 9:48 PM EDT	Special Marine Warning	BOX		57 min
Jul 24, 10:27 PM EDT	Special Marine Warning	BOX		63 min
Jul 24, 10:36 PM EDT	Special Marine Warning	BOX		27 min
Jul 24, 11:51 PM EDT	Special Marine Warning	BOX		54 min
Jul 25, 12:33 AM EDT	Special Marine Warning	BOX		57 min
Jul 25, 4:35 PM EDT	Small Craft Advisory	BOX		35 hr

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2012 Every 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.