Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 24, NWS Boston/Norton, MA

June 23, 2012Middlesex County, Suffolk County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 23, 2012, 4:42 PM EDT for Middlesex County, Suffolk County, Massachusetts. It was in force for 48 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, 4:42 PM EDT (20:42 UTC)
Expired: Jun 23, 2012, 5:30 PM EDT
In force: 48 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Middlesex County, MA, Suffolk County, MA

The radar

The Boston radar (KBOX), 52 km from the middle of the area, began a volume at 20:44 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
Jun 23, 5:05 PM EDT	HAIL 0.75	Weston, MA	0.75 HAIL ON RTE 128
Jun 23, 5:07 PM EDT	TSTM WND DMG	Arlington, MA	TREE DOWN ON MYSTIC LAKE DRIVE
Jun 23, 5:19 PM EDT	TSTM WND DMG	Waltham, MA	FOREST STREET AT TRAPELO 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, 8.7 hours before the alert went out and 133 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: 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.

711 
WUUS51 KBOX 232042
SVRBOX
MAC017-025-232130-
/O.NEW.KBOX.SV.W.0024.120623T2042Z-120623T2130Z/

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

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...
  CENTRAL MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...WALTHAM...NEWTON...CAMBRIDGE...

* UNTIL 530 PM EDT

* AT 440 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 NEAR CONCORD...OR 6 MILES WEST
  OF WALTHAM...AND WAS MOVING EAST AT 15 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...LINCOLN...WESTON...
  BEDFORD...LEXINGTON...BURLINGTON...WATERTOWN...BELMONT...
  ARLINGTON...WOBURN...WINCHESTER...MEDFORD AND STONEHAM.

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 4253 7107 4235 7112 4232 7117 4233 7136
      4239 7142 4246 7139
TIME...MOT...LOC 2043Z 269DEG 14KT 4242 7134

$$

SIPPRELL

2 follow-up statements

277 
WWUS51 KBOX 232049
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
449 PM EDT SAT JUN 23 2012

MAC017-025-232130-
/O.CON.KBOX.SV.W.0024.000000T0000Z-120623T2130Z/
MIDDLESEX MA-SUFFOLK MA-
449 PM EDT SAT JUN 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR WEST CENTRAL SUFFOLK AND CENTRAL MIDDLESEX COUNTIES...

AT 444 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 NEAR LINCOLN...OR NEAR WALTHAM...MOVING EAST AT 15 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WESTON...BEDFORD...LEXINGTON...WATERTOWN...BELMONT...ARLINGTON...
WOBURN...BRIGHTON...WINCHESTER...ALLSTON...CAMBRIDGE...MEDFORD AND
STONEHAM

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 4253 7107 4235 7112 4232 7117 4233 7136
      4239 7142 4246 7139
TIME...MOT...LOC 2049Z 269DEG 14KT 4242 7131

$$

SIPPRELL

359 
WWUS51 KBOX 232125
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
525 PM EDT SAT JUN 23 2012

MAC017-025-232135-
/O.EXP.KBOX.SV.W.0024.000000T0000Z-120623T2130Z/
MIDDLESEX MA-SUFFOLK MA-
525 PM EDT SAT JUN 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SUFFOLK AND
CENTRAL MIDDLESEX COUNTIES WILL EXPIRE AT 530 PM EDT...

THE STORM HAS MOVED OUT OF THE WARNED AREA. 

LAT...LON 4253 7107 4235 7112 4232 7117 4233 7136
      4239 7142 4246 7139
TIME...MOT...LOC 2125Z 269DEG 14KT 4242 7112

$$

SIPPRELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 3:22 PM EDT	Special Weather Statement	BOX	Franklin	38 min
Jun 23, 3:52 PM EDT	Special Weather Statement	BOX	Franklin	38 min
Jun 23, 4:23 PM EDT	Special Weather Statement	BOX	Essex	52 min
Jun 23, 4:30 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	35 min
Jun 23, 4:56 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk	49 min
Jun 23, 4:57 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	33 min
Jun 23, 5:01 PM EDT	Special Marine Warning	BOX		89 min
Jun 23, 5:09 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Suffolk	36 min
Jun 23, 5:19 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Norfolk, Plymouth, Suffolk	4 hr
Jun 23, 5:22 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth, Suffolk	53 min
Jun 23, 5:26 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	35 min
Jun 23, 5:27 PM EDT	Special Marine Warning	BOX		33 min
Jun 23, 5:52 PM EDT	Special Marine Warning	BOX		30 min
Jun 23, 5:55 PM EDT	Special Marine Warning	BOX		65 min
Jun 23, 6:06 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth	39 min
Jun 23, 6:10 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	31 min
Jun 23, 6:11 PM EDT	Special Marine Warning	BOX		26 min
Jun 23, 6:29 PM EDT	Special Weather Statement	BOX	Bristol, Plymouth	46 min
Jun 23, 6:35 PM EDT	Special Marine Warning	BOX		55 min
Jun 23, 6:45 PM EDT	Special Weather Statement	BOX	Barnstable, Dukes	90 min
Jun 23, 7:26 PM EDT	Special Marine Warning	BOX		40 min

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.