Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 45, NWS Boston/Norton, MA

July 18, 2016Norfolk County, Plymouth County, Suffolk County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 18, 2016, 4:34 PM EDT for Norfolk County, Plymouth County, Suffolk County, Massachusetts. It was in force for 41 min. 12 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: Jul 18, 2016, 4:34 PM EDT (20:34 UTC)
Expired: Jul 18, 2016, 5:15 PM EDT
In force: 41 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

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

The radar

The Boston radar (KBOX), 35 km from the middle of the area, began a volume at 20:36 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 18, 4:39 PM EDT	TSTM WND DMG	Jamaica Plain, MA	TREE DOWN ACROSS ROAD ON TOWER AVENUE.
Jul 18, 4:39 PM EDT	TSTM WND DMG	Mattapan, MA	TREE DOWN ON LRONA ROAD.
Jul 18, 4:40 PM EDT	TSTM WND DMG	Dorchester, MA	TREE DOWN ON BICKNELL AND HARBOT STREETS.
Jul 18, 4:40 PM EDT	TSTM WND DMG	West Roxbury, MA	2 LARGE TREES DOWN.
Jul 18, 4:47 PM EDT	TSTM WND DMG	Quincy, MA	EXTENSIVE NUMBER OF TREES DOWNED.
Jul 18, 4:47 PM EDT	TSTM WND DMG	Quincy, MA	EXTENSIVE TREES DOWN.
Jul 18, 4:50 PM EDT	TSTM WND DMG	Weymouth, MA	MULTIPLE TREES AND WIRES DOWN ON LOVELL ST. TREE AND WIRES DOWN ON WESSAGUSSET RD. TREE DOWN ON SQUANTO RD. LIMBS DOWN ON RIVER ST. PAST THE BEACH. A BOAT BROKE FREE OF ITS MOORING ON LANE BEACH. TREE AND BRANCHES DOWN ON SEA ST. TREE INTO A HOUSE ON MIDDLE ST
Jul 18, 4:55 PM EDT	TSTM WND DMG	Hingham, MA	NUMEROUS TREES ADN WIRES DOWN ON MULTIPLE STREETS IN THE NORTHERN PART OF HINGHAM.
Jul 18, 4:55 PM EDT	TSTM WND DMG	Hingham, MA	NUMEROUS TREES AND WIRES DOWN IN NORTH PART OF HINGHAM INCLUDING...DOWNERS AVE.... BULOW RD.... PLANDERS FIELD LANE... JARVIS AVE.... LINCOLN ST.... MILES RD. WHITON DR.... PARK VIEW DR.... BURDITT AVE.... BRADLEY WOODS DR.... USS AMESBURY RD.... GREEN ST....
Jul 18, 4:55 PM EDT	NON-TSTM WND GST 65	Hingham, MA	MEDIA
Jul 18, 5:00 PM EDT	TSTM WND DMG	Weymouth, MA	SMALL BOAT FLIPPED OVER JUST OFFSHORE NEAR RIVER STREET IN WEYMOUTH.
Jul 18, 5:07 PM EDT	TSTM WND DMG	Hingham, MA	LARGE LIMBS DOWN ON WOMPATUCK ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 18, 12:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 8.6 hours before the alert went out and 95 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: 18 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 1097 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

373 
WUUS51 KBOX 182034
SVRBOX
MAC021-023-025-182115-
/O.NEW.KBOX.SV.W.0045.160718T2034Z-160718T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
434 PM EDT MON JUL 18 2016

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN PLYMOUTH COUNTY IN SOUTHEASTERN MASSACHUSETTS...
  NORTHEASTERN NORFOLK COUNTY IN EASTERN MASSACHUSETTS...
  SOUTHWESTERN SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...

* UNTIL 515 PM EDT

* AT 432 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER DEDHAM AND
  CANTON...OR NEAR MILTON...MOVING EAST-SOUTHEAST AT 35 MPH. THIS IS
  A DANGEROUS STORM AND HAS KNOCKED DOWN SEVERAL TREES IN THE
  WELLESLEY AREA.

  HAZARD...70 MPH WIND GUSTS AND PENNY SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT CONSIDERABLE TREE DAMAGE. DAMAGE IS LIKELY TO 
           MOBILE HOMES...ROOFS...AND OUTBUILDINGS. 

* LOCATIONS IMPACTED INCLUDE...
  BOSTON...BROCKTON...QUINCY...NEWTON...BROOKLINE...WEYMOUTH...
  BRAINTREE...RANDOLPH...NORWOOD...MILTON...STOUGHTON...MARSHFIELD...
  DEDHAM...WALPOLE...HINGHAM...CANTON...SCITUATE...PEMBROKE...
  SHARON AND ROCKLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4204 7066 4202 7068 4212 7123 4229 7119
      4231 7117 4230 7101 4228 7102 4226 7097
      4229 7094 4225 7096 4227 7093 4225 7088
      4229 7088 4226 7087 4227 7083 4224 7077
      4225 7077 4209 7064 4205 7066 4201 7060
TIME...MOT...LOC 2032Z 277DEG 28KT 4220 7112 

HAIL...0.75IN
WIND...70MPH
 
$$
FIELD

1 follow-up statement

635 
WWUS51 KBOX 182106
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
506 PM EDT MON JUL 18 2016

MAC025-182113-
/O.CAN.KBOX.SV.W.0045.000000T0000Z-160718T2115Z/
SUFFOLK MA-
506 PM EDT MON JUL 18 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SUFFOLK COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING MOVED SOUTHEAST
OF SUFFOLK COUNTY AND THEREFORE THE WARNING FOR SUFFOLK COUNTY HAS
BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FOR
EASTERN AND SOUTHEASTERN MASSACHUSETTS.

LAT...LON 4208 7065 4206 7070 4212 7102 4223 7102
      4223 7098 4226 7096 4226 7097 4227 7095
      4225 7096 4227 7093 4225 7088 4229 7088
      4226 7087 4227 7083 4224 7077 4225 7077
      4209 7064 4207 7065 4205 7067
TIME...MOT...LOC 2103Z 277DEG 28KT 4217 7082 

$$

MAC021-023-182115-
/O.CON.KBOX.SV.W.0045.000000T0000Z-160718T2115Z/
PLYMOUTH MA-NORFOLK MA-
506 PM EDT MON JUL 18 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHERN PLYMOUTH AND EAST CENTRAL NORFOLK COUNTIES...

AT 503 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR COHASSET
...MOVING EAST AT 30 MPH.  THE STORM WAS WEAKENING BUT STILL COULD
PRODUCE DAMAGING WIND GUSTS.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
QUINCY...WEYMOUTH...BRAINTREE...MARSHFIELD...HINGHAM...SCITUATE...
HULL...AND COHASSET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4208 7065 4206 7070 4212 7102 4223 7102
      4223 7098 4226 7096 4226 7097 4227 7095
      4225 7096 4227 7093 4225 7088 4229 7088
      4226 7087 4227 7083 4224 7077 4225 7077
      4209 7064 4207 7065 4205 7067
TIME...MOT...LOC 2103Z 277DEG 28KT 4217 7082 

HAIL...<.75IN
WIND...60MPH
 
$$
FIELD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 1:22 PM EDT	Special Weather Statement	BOX	Franklin	38 min
Jul 18, 1:42 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	48 min
Jul 18, 2:18 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	27 min
Jul 18, 2:30 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	45 min
Jul 18, 2:56 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	34 min
Jul 18, 3:08 PM EDT	Special Weather Statement	BOX	Essex	37 min
Jul 18, 3:17 PM EDT	Severe Thunderstorm Warning	BOX	Essex	28 min
Jul 18, 3:31 PM EDT	Special Weather Statement	BOX	Middlesex	29 min
Jul 18, 3:53 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk	52 min
Jul 18, 4:08 PM EDT	Special Marine Warning	BOX		52 min
Jul 18, 4:14 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk	46 min
Jul 18, 4:31 PM EDT	Special Marine Warning	BOX		59 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2016 Every severe thunderstorm warning in 2016

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.