Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 30, NWS Boston/Norton, MA

June 27, 2017Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 27, 2017, 4:46 PM EDT for Middlesex County, Massachusetts. It was in force for 29 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: Jun 27, 2017, 4:46 PM EDT (20:46 UTC)
Expired: Jun 27, 2017, 5:15 PM EDT
In force: 29 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Middlesex County, MA

The radar

The Boston radar (KBOX), 61 km from the middle of the area, began a volume at 20:48 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
Jun 27, 4:52 PM EDT	HAIL 1	Stow, MA
Jun 27, 4:55 PM EDT	HAIL 1	Hudson, MA
Jun 27, 5:00 PM EDT	TSTM WND DMG	Concord, MA	TREE DOWN ON RIDGEWOOD ROAD
Jun 27, 5:05 PM EDT	HAIL 0.75	Billerica, MA

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, 8.8 hours before the alert went out and 148 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: 25 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1383 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: -16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

849 
WUUS51 KBOX 272046
SVRBOX
MAC017-272115-
/O.NEW.KBOX.SV.W.0030.170627T2046Z-170627T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
446 PM EDT TUE JUN 27 2017

The National Weather Service in Taunton has issued a

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

* Until 515 PM EDT

* At 444 PM EDT, a severe thunderstorm was located over Maynard, or
  near Marlborough, moving northeast at 35 mph.

  HAZARD...Quarter size hail and wind gusts up to 40 mph. 

  SOURCE...Radar indicated. Hail up to half inch has been reported 
           with this size.

  IMPACT...Damage to vehicles is possible. 

* Locations impacted include...
  Framingham, Waltham, Medford, Arlington, Billerica, Marlborough,
  Woburn, Chelmsford, Lexington, Tewksbury, Belmont, Burlington,
  Wilmington, Acton, Stoneham, Winchester, Hudson, Concord, Sudbury
  and Bedford.

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 4263 7125 4244 7110 4233 7150 4241 7158
      4241 7156 4242 7156
TIME...MOT...LOC 2044Z 235DEG 32KT 4240 7148 

HAIL...1.00IN
WIND...<50MPH
 
$$

Sipprell

2 follow-up statements

441 
WWUS51 KBOX 272051
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
451 PM EDT TUE JUN 27 2017

MAC017-272115-
/O.CON.KBOX.SV.W.0030.000000T0000Z-170627T2115Z/
Middlesex MA-
451 PM EDT TUE JUN 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN MIDDLESEX COUNTY...

At 450 PM EDT, a severe thunderstorm was located over Maynard, or 8
miles north of Framingham, moving northeast at 35 mph.

HAZARD...Quarter size hail. 

SOURCE...Trained weather spotters reported quarter sized hail in 
         Maynard Massachusetts. 

IMPACT...Damage to vehicles is possible. 

Locations impacted include...
Waltham, Medford, Arlington, Billerica, Woburn, Chelmsford,
Lexington, Tewksbury, Belmont, Burlington, Wilmington, Acton,
Stoneham, Winchester, Hudson, Concord, Sudbury, Bedford, Wayland and
Weston.

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 4263 7125 4244 7110 4235 7143 4243 7154
TIME...MOT...LOC 2050Z 235DEG 32KT 4243 7141 

HAIL...1.00IN
WIND...<50MPH
 
$$

Sipprell

355 
WWUS51 KBOX 272112
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
512 PM EDT TUE JUN 27 2017

MAC017-272122-
/O.EXP.KBOX.SV.W.0030.000000T0000Z-170627T2115Z/
Middlesex MA-
512 PM EDT TUE JUN 27 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MIDDLESEX COUNTY
WILL EXPIRE AT 515 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However small hail
is still possible with this thunderstorm.

LAT...LON 4263 7125 4244 7110 4235 7143 4243 7154
TIME...MOT...LOC 2112Z 235DEG 32KT 4254 7120 

$$

md

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 4:03 AM EDT	Small Craft Advisory	BOX		15 hr
Jun 27, 1:40 PM EDT	Special Weather Statement	BOX	Worcester	50 min
Jun 27, 2:03 PM EDT	Special Weather Statement	BOX	Worcester	42 min
Jun 27, 2:07 PM EDT	Special Weather Statement	BOX	Hampden	53 min
Jun 27, 2:22 PM EDT	Special Weather Statement	BOX	Middlesex	53 min
Jun 27, 2:44 PM EDT	Special Weather Statement	BOX	Middlesex	31 min
Jun 27, 2:49 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	41 min
Jun 27, 3:16 PM EDT	Special Weather Statement	BOX	Worcester	59 min
Jun 27, 3:28 PM EDT	Special Weather Statement	BOX	Middlesex	32 min
Jun 27, 3:32 PM EDT	Special Weather Statement	BOX	Hampden	43 min
Jun 27, 3:37 PM EDT	Areal Flood Advisory	BOX	Middlesex, Worcester	113 min
Jun 27, 3:39 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	51 min
Jun 27, 4:12 PM EDT	Special Weather Statement	BOX	Middlesex	48 min
Jun 27, 4:43 PM EDT	Special Weather Statement	BOX	Essex	47 min
Jun 27, 5:27 PM EDT	Special Weather Statement	BOX	Essex	33 min
Jun 27, 5:41 PM EDT	Special Weather Statement	BOX	Hampshire	49 min
Jun 27, 5:52 PM EDT	Special Marine Warning	BOX		53 min
Jun 27, 6:17 PM EDT	Special Weather Statement	BOX	Hampden	43 min
Jun 27, 6:34 PM EDT	Special Weather Statement	BOX	Franklin, Hampshire	56 min
Jun 27, 6:38 PM EDT	Special Weather Statement	BOX	Suffolk	37 min
Jun 27, 7:10 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	33 min
Jun 27, 7:17 PM EDT	Special Weather Statement	BOX	Worcester	43 min
Jun 27, 7:56 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Worcester	49 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.