Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 42, NWS Boston/Norton, MA

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

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 18, 2016, 3:53 PM EDT for Middlesex County, Norfolk County, Suffolk County, Massachusetts. It was in force for 52 min. 11 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, 3:53 PM EDT (19:53 UTC)
Expired: Jul 18, 2016, 4:45 PM EDT
In force: 52 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Boston radar (KBOX), 41 km from the middle of the area, began a volume at 19:53 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, 4:03 PM EDT	TSTM WND DMG	Framingham, MA	TREES DOWN ON UNION STREET NORTH OF RT. 9. ALSO A TWO-FOOT DIAMETER TREE DOWN ON A HOME.
Jul 18, 4:27 PM EDT	TSTM WND DMG	Wellesley, MA	TREE DOWN ON HOUSE ON DEWEY PATH. TREE DOWN AND BROKEN UTILITY POLE ON WESTON ROAD.
Jul 18, 4:27 PM EDT	TSTM WND DMG	Wellesley, MA	TREE DOWN ON ROUTE 16 BY WELLESLEY COLLEGE. TREE DOWN AND NUMEROUS BRANCHES OF VARYING SIZE DOWN ON BROOKE STREET. LARGE BRANCH DOWN AND BLOCKING LATEN ROAD.
Jul 18, 4:30 PM EDT	TSTM WND DMG	Needham, MA	TREE AND WIRES DOWN ON HOOVER STREET
Jul 18, 4:39 PM EDT	TSTM WND DMG	Boston, MA	POWER LINES DOWN ON WELD STREET AT GARNET ROAD. POWER LINES DOWN ON BEECH STREET.
Jul 18, 4:39 PM EDT	TSTM WND DMG	Jamaica Plain, MA	TREE DOWN ACROSS ROAD ON TOWER AVENUE.
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, 4:42 PM EDT	TSTM WND DMG	Boston, MA	UTILITY POLE DOWN ON WASHINGTON STREET AT NEW WASHINGTON.
Jul 18, 4:45 PM EDT	TSTM WND DMG	Boston, MA	TREE INTO HOUSE ON WARNER STREET.
Jul 18, 4:52 PM EDT	TSTM WND DMG	Boston, MA	TREE DOWN BLOCKING LA GRANGE STREET.

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, 7.9 hours before the alert went out and 130 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.

453 
WUUS51 KBOX 181953
SVRBOX
MAC017-021-025-182045-
/O.NEW.KBOX.SV.W.0042.160718T1953Z-160718T2045Z/

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

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL NORFOLK COUNTY IN EASTERN MASSACHUSETTS...
  SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...
  SOUTHEASTERN MIDDLESEX COUNTY IN NORTHEASTERN MASSACHUSETTS...

* UNTIL 445 PM EDT

* AT 352 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
  WESTBOROUGH... OR NEAR MARLBOROUGH...MOVING EAST AT 40 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  BOSTON...CAMBRIDGE...NEWTON...SOMERVILLE...FRAMINGHAM...WALTHAM...
  MALDEN...BROOKLINE...MEDFORD...ARLINGTON...EVERETT...NATICK...
  WATERTOWN...NEEDHAM...WELLESLEY...MELROSE...BELMONT...DEDHAM...
  STONEHAM AND WESTBOROUGH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4245 7108 4231 7104 4230 7105 4230 7104
      4228 7103 4223 7160 4226 7158 4227 7156
      4227 7151 4233 7148
TIME...MOT...LOC 1952Z 255DEG 35KT 4227 7159 

HAIL...1.00IN
WIND...60MPH
 
$$
FIELD

1 follow-up statement

339 
WWUS51 KBOX 182004
SVSBOX

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

MAC017-021-025-182045-
/O.CON.KBOX.SV.W.0042.000000T0000Z-160718T2045Z/
NORFOLK MA-SUFFOLK MA-MIDDLESEX MA-
404 PM EDT MON JUL 18 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTH CENTRAL NORFOLK...SOUTHWESTERN SUFFOLK AND SOUTHEASTERN
MIDDLESEX COUNTIES...

AT 404 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ASHLAND...OR
OVER FRAMINGHAM...MOVING EAST AT 35 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO 
         ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
BOSTON...CAMBRIDGE...NEWTON...SOMERVILLE...FRAMINGHAM...WALTHAM...
MALDEN...BROOKLINE...MEDFORD...ARLINGTON...EVERETT...NATICK...
WATERTOWN...NEEDHAM...WELLESLEY...MELROSE...BELMONT...DEDHAM...
STONEHAM AND SUDBURY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4245 7108 4231 7104 4230 7105 4230 7104
      4228 7103 4224 7152 4226 7153 4227 7151
      4233 7148
TIME...MOT...LOC 2004Z 260DEG 30KT 4228 7146 

HAIL...1.00IN
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, 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
Jul 18, 4:34 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth, Suffolk	41 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.