Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 53, NWS Boston/Norton, MA

July 12, 2017Middlesex County, Norfolk County, Suffolk County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 12, 2017, 6:20 PM EDT for Middlesex County, Norfolk County, Suffolk County, Massachusetts. It was in force for 25 min. 7 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 12, 2017, 6:20 PM EDT (22:20 UTC)
Expired: Jul 12, 2017, 6:45 PM EDT
In force: 25 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Boston radar (KBOX), 48 km from the middle of the area, began a volume at 22:21 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 12, 6:44 PM EDT	TSTM WND DMG	Watertown, MA	TREE DOWN ON CHARLES RIVER STREET AT IRVINE STREET
Jul 12, 6:45 PM EDT	TSTM WND DMG	Watertown, MA	TREES AND WIRES DOWN ON PLEASANT STREET
Jul 12, 6:46 PM EDT	TSTM WND DMG	Brookline, MA	LARGE BRANCH DOWN AT ARLINGTON AND HEATH STREET
Jul 12, 6:47 PM EDT	TSTM WND DMG	Newton, MA	TREE DOWN ON CAR ON ANTHONY CIRCLE
Jul 12, 6:47 PM EDT	TSTM WND DMG	Newton, MA	TREE DOWN ON WIRES ON LOWELL STREET
Jul 12, 6:47 PM EDT	TSTM WND DMG	Newton, MA	TREES DOWN ON LAKE STREET
Jul 12, 6:52 PM EDT	TSTM WND DMG	Newton, MA	WASHINGTON ROAD CLOSED DUE TO DOWNED TREES AND WIRES

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, 10.3 hours before the alert went out and 135 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: 358 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1158 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

657 
WUUS51 KBOX 122220
SVRBOX
MAC017-021-025-122245-
/O.NEW.KBOX.SV.W.0053.170712T2220Z-170712T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
620 PM EDT WED JUL 12 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  North central Norfolk County in eastern Massachusetts...
  Southwestern Suffolk County in eastern Massachusetts...
  Southeastern Middlesex County in northeastern Massachusetts...

* Until 645 PM EDT

* At 620 PM EDT, a severe thunderstorm was located over Lincoln, or
  over Waltham, moving southeast at 15 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Boston, Cambridge, Newton, Somerville, Framingham, Waltham,
  Brookline, Arlington, Billerica, Woburn, Natick, Watertown,
  Lexington, Needham, Wellesley, Belmont, Dedham, Burlington, Acton
  and Winchester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4243 7147 4252 7123 4233 7106 4222 7118
      4231 7140
TIME...MOT...LOC 2220Z 327DEG 11KT 4241 7128 

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

Sipprell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 10:15 AM EDT	Flash Flood Watch	BOX	Bristol, Essex, Hampden, Middlesex, Norfolk, Plymouth and 2 more	11 hr
Jul 12, 11:01 AM EDT	Special Weather Statement	BOX	Suffolk	29 min
Jul 12, 12:01 PM EDT	Special Weather Statement	BOX	Franklin	44 min
Jul 12, 12:05 PM EDT	Special Weather Statement	BOX	Worcester	40 min
Jul 12, 12:24 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	51 min
Jul 12, 12:25 PM EDT	Areal Flood Advisory	BOX	Franklin	65 min
Jul 12, 12:36 PM EDT	Special Weather Statement	BOX	Hampden	39 min
Jul 12, 12:44 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Worcester	61 min
Jul 12, 12:46 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk	44 min
Jul 12, 12:50 PM EDT	Special Weather Statement	BOX	Middlesex	40 min
Jul 12, 12:53 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	67 min
Jul 12, 1:19 PM EDT	Areal Flood Advisory	BOX	Hampden	56 min
Jul 12, 1:22 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	38 min
Jul 12, 1:39 PM EDT	Special Weather Statement	BOX	Worcester	51 min
Jul 12, 1:39 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	51 min
Jul 12, 1:41 PM EDT	Special Weather Statement	BOX	Middlesex	49 min
Jul 12, 1:47 PM EDT	Special Weather Statement	BOX	Hampden	43 min
Jul 12, 1:52 PM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk, Plymouth	53 min
Jul 12, 2:35 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	55 min
Jul 12, 2:53 PM EDT	Flash Flood Warning	BOX	Bristol, Norfolk	112 min
Jul 12, 3:04 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Worcester	56 min
Jul 12, 3:10 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	50 min
Jul 12, 3:26 PM EDT	Flash Flood Warning	BOX	Bristol	2 hr
Jul 12, 3:36 PM EDT	Special Weather Statement	BOX	Hampshire	39 min
Jul 12, 3:44 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	35 min
Jul 12, 3:53 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	34 min
Jul 12, 4:01 PM EDT	Special Weather Statement	BOX	Hampden	44 min
Jul 12, 4:06 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	114 min
Jul 12, 4:16 PM EDT	Special Weather Statement	BOX	Plymouth	44 min
Jul 12, 4:18 PM EDT	Areal Flood Advisory	BOX	Norfolk, Plymouth, Suffolk	57 min
Jul 12, 4:24 PM EDT	Special Marine Warning	BOX		66 min
Jul 12, 4:32 PM EDT	Special Marine Warning	BOX		58 min
Jul 12, 4:36 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire	114 min
Jul 12, 4:39 PM EDT	Special Marine Warning	BOX		66 min
Jul 12, 4:48 PM EDT	Special Weather Statement	BOX	Middlesex	42 min
Jul 12, 4:53 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	112 min
Jul 12, 5:00 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex	60 min
Jul 12, 5:19 PM EDT	Areal Flood Advisory	BOX	Hampden, Worcester	56 min
Jul 12, 5:21 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	35 min
Jul 12, 5:36 PM EDT	Flash Flood Warning	BOX	Worcester	114 min
Jul 12, 5:36 PM EDT	Special Weather Statement	BOX	Middlesex	39 min
Jul 12, 5:42 PM EDT	Flash Flood Warning	BOX	Middlesex	2 hr
Jul 12, 6:10 PM EDT	Special Weather Statement	BOX	Middlesex	35 min
Jul 12, 6:29 PM EDT	Flash Flood Warning	BOX	Middlesex, Norfolk, Suffolk	2 hr
Jul 12, 6:39 PM EDT	Special Weather Statement	BOX	Norfolk	36 min
Jul 12, 7:05 PM EDT	Special Weather Statement	BOX	Suffolk	25 min
Jul 12, 7:35 PM EDT	Areal Flood Warning	BOX	Middlesex	115 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.