Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 5, NWS Boston/Norton, MA

May 18, 2017Essex County, Middlesex County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 18, 2017, 9:43 PM EDT for Essex County, Middlesex County, Worcester County, Massachusetts. It was in force for 62 min. 13 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: May 18, 2017, 9:43 PM EDT (01:43 UTC)
Expired: May 18, 2017, 10:45 PM EDT
In force: 62 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Essex County, MA, Middlesex County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 88 km from the middle of the area, began a volume at 01:43 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
May 18, 10:00 PM EDT	TSTM WND DMG	Westminster, MA	TREE DOWN BLOCKING EAST ROAD NEAR LENO PARK.
May 18, 10:20 PM EDT	TSTM WND DMG	Leominster, MA	LARGE BRANCH DOWN ON HIGH TENSION WIRE ON MOHAGONY RUN.
May 18, 10:38 PM EDT	TSTM WND DMG	Amesbury, MA	TREE DOWN ON PLEASANT VALLEY ROAD.
May 18, 10:38 PM EDT	TSTM WND DMG	Methuen, MA	TREE DOWN ON WEST STREET AT VARNAI STREET.
May 18, 10:42 PM EDT	TSTM WND DMG	Billerica, MA	TREE DOWN ON GREENVILLE STREET.
May 18, 10:42 PM EDT	TSTM WND DMG	Lowell, MA	TREE DOWN ON PLEASANT STREET.
May 18, 10:42 PM EDT	TSTM WND DMG	Merrimac, MA	MULTIPLE TREES DOWN ON PROSPECT STREET.
May 18, 10:43 PM EDT	TSTM WND DMG	Tewksbury, MA	TREE DOWN ON PIKE STREET.
May 18, 10:45 PM EDT	TSTM WND DMG	Danvers, MA	TREES AND WIRES DOWN ON CRESTLINE CIRCLE
May 18, 10:45 PM EDT	TSTM WND DMG	Ipswich, MA	TREE DOWN ACROSS ROADWAY ON COUNTY ROAD BY RIVER BEND.
May 18, 10:55 PM EDT	TSTM WND DMG	Haverhill, MA	TREE FELL ON HOUSE ON WHITTIER STREET
May 18, 10:55 PM EDT	TSTM WND DMG	Lawrence, MA	WIRES DOWN ON JEFFFERSON STREET
May 18, 10:55 PM EDT	TSTM WND DMG	Peabody, MA	TREE DOWN ON WIRES ON LYNN STREET AT BOWEN ROAD

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

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 1.7 hours before the alert went out and 144 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: 82 J/kg
Mixed-layer CIN: -207 J/kg
Mixed-layer LCL: 2806 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

358 
WUUS51 KBOX 190143
SVRBOX
MAC009-017-027-190245-
/O.NEW.KBOX.SV.W.0005.170519T0143Z-170519T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
943 PM EDT THU MAY 18 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  Northeastern Worcester County in central Massachusetts...
  Essex County in northeastern Massachusetts...
  Middlesex County in northeastern Massachusetts...

* Until 1045 PM EDT

* At 942 PM EDT, a severe thunderstorm was located near Templeton, or
  10 miles east of Orange, moving east at 55 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Lowell, Lynn, Nashua, Lawrence, Haverhill, Waltham, Malden,
  Medford, Peabody, Methuen, Arlington, Salem, Leominster, Fitchburg,
  Billerica, Beverly, Marlborough, Woburn, Chelmsford and Andover.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4287 7082 4283 7081 4281 7087 4280 7083
      4282 7082 4280 7081 4280 7076 4253 7089
      4236 7125 4236 7201 4271 7193 4270 7129
      4274 7124 4274 7118 4279 7118 4282 7115
      4281 7107 4286 7103 4288 7088
TIME...MOT...LOC 0142Z 279DEG 47KT 4262 7209 

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

LEC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 8:36 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	39 min
May 18, 9:05 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	55 min
May 18, 10:14 PM EDT	Special Weather Statement	BOX	Hampshire, Middlesex, Worcester	61 min
May 18, 10:20 PM EDT	Special Marine Warning	BOX		55 min
May 18, 10:41 PM EDT	Special Weather Statement	BOX	Essex, Norfolk, Suffolk	49 min
May 18, 11:45 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	30 min
May 19, 12:04 AM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk, Worcester	27 min
May 19, 12:08 AM EDT	Special Marine Warning	BOX		97 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.