Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 78, NWS Boston/Norton, MA

September 6, 2017Norfolk County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 6, 2017, 11:10 AM EDT for Norfolk County, Plymouth County, Massachusetts. It was in force for 35 min. 4 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: Sep 6, 2017, 11:10 AM EDT (15:10 UTC)
Expired: Sep 6, 2017, 11:45 AM EDT
In force: 35 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Norfolk County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 34 km from the middle of the area, began a volume at 15:12 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
Sep 6, 11:10 AM EDT	TSTM WND DMG	Middleboro, MA	TREE DOWN ON PLYMOUTH STREET
Sep 6, 11:20 AM EDT	TSTM WND DMG	Holbrook, MA	TREE DOWN ON WESTON AVENUE AT UNION STREET
Sep 6, 11:24 AM EDT	TSTM WND DMG	Braintree, MA	TREE DOWN IN ROAD NEAR STOP AND SHOP
Sep 6, 11:34 AM EDT	TSTM WND DMG	Weymouth, MA	WIRES DOWN ON SUMMER STREET

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, 3.2 hours before the alert went out and 69 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: 363 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 654 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

965 
WUUS51 KBOX 061510
SVRBOX
MAC021-023-061545-
/O.NEW.KBOX.SV.W.0078.170906T1510Z-170906T1545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
1110 AM EDT WED SEP 6 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  East central Norfolk County in eastern Massachusetts...
  Plymouth County in southeastern Massachusetts...

* Until 1145 AM EDT

* At 1109 AM EDT, severe thunderstorms were located along a line
  extending from Weymouth to near Wareham, moving northeast at 60
  mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Brockton, Quincy, Plymouth, Weymouth, Braintree, Randolph, Milton,
  Stoughton, Bridgewater, Marshfield, Marion, Middleborough, Hingham,
  Wareham, Canton, Bourne, Scituate, Pembroke, Rockland and Abington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4177 7062 4177 7061 4170 7067 4172 7070
      4167 7070 4160 7083 4175 7088 4176 7091
      4220 7113 4232 7085 4228 7084 4227 7077
      4220 7070 4217 7070 4201 7058 4198 7062
      4193 7052 4181 7051
TIME...MOT...LOC 1509Z 239DEG 51KT 4223 7090 4175 7063 

HAIL...0.75IN
WIND...60MPH
 
$$

LEC

1 follow-up statement

284 
WWUS51 KBOX 061537
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
1137 AM EDT WED SEP 6 2017

MAC021-023-061546-
/O.EXP.KBOX.SV.W.0078.000000T0000Z-170906T1545Z/
Norfolk MA-Plymouth MA-
1137 AM EDT WED SEP 6 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL NORFOLK AND
PLYMOUTH COUNTIES WILL EXPIRE AT 1145 AM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning will be allowed to expire.

LAT...LON 4177 7062 4177 7061 4170 7067 4172 7070
      4167 7070 4160 7083 4175 7088 4176 7091
      4220 7113 4232 7085 4228 7084 4227 7077
      4220 7070 4217 7070 4201 7058 4198 7062
      4193 7052 4181 7051
TIME...MOT...LOC 1536Z 239DEG 51KT 4242 7046 4194 7019 

$$

LEC

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 9:30 AM EDT	Special Weather Statement	BOX	Essex	30 min
Sep 6, 9:45 AM EDT	Small Craft Advisory	BOX		25 hr
Sep 6, 10:00 AM EDT	Special Marine Warning	BOX		45 min
Sep 6, 10:04 AM EDT	Severe Thunderstorm Warning	BOX	Bristol	41 min
Sep 6, 10:16 AM EDT	Special Marine Warning	BOX		44 min
Sep 6, 10:42 AM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	33 min
Sep 6, 10:45 AM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	60 min
Sep 6, 11:08 AM EDT	Special Marine Warning	BOX		37 min
Sep 6, 11:33 AM EDT	Special Weather Statement	BOX	Dukes	27 min
Sep 6, 11:44 AM EDT	Special Marine Warning	BOX		46 min
Sep 6, 11:46 AM EDT	Severe Thunderstorm Warning	BOX	Essex	29 min
Sep 6, 11:50 AM EDT	Special Weather Statement	BOX	Barnstable	25 min
Sep 6, 12:01 PM EDT	Special Marine Warning	BOX		59 min
Sep 6, 12:07 PM EDT	Special Weather Statement	BOX	Barnstable	38 min
Sep 6, 12:35 PM EDT	Special Weather Statement	BOX	Barnstable	25 min
Sep 6, 1:11 PM EDT	Special Weather Statement	BOX	Dukes	64 min
Sep 6, 1:39 PM EDT	Areal Flood Warning	BOX	Barnstable	111 min
Sep 6, 4:10 PM EDT	Special Marine Warning	BOX		65 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2017 Every severe thunderstorm warning in 2017

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.