Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Boston/Norton, MA

June 22, 2021Bristol County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 22, 2021, 3:06 PM EDT for Bristol County, Plymouth County, Massachusetts. It was in force for 23 min. 3 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 22, 2021, 3:06 PM EDT (19:06 UTC)
Expired: Jun 22, 2021, 3:29 PM EDT
In force: 23 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bristol County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 37 km from the middle of the area, began a volume at 19:07 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 22, 3:06 PM EDT	TSTM WND DMG	1 Ene Raynham, MA	WIRES DOWN ON LOCUST ST.
Jun 22, 3:06 PM EDT	TSTM WND DMG	2 Ene Raynham, MA	TREE DOWN ON PLEASANT ST.
Jun 22, 3:06 PM EDT	TSTM WND DMG	2 Ne Raynham, MA	TREE DOWN ON ROUTE 24 SOUTHBOUND NEAR THE BRIDGEWATER LINE.

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 12:00Z, 7.1 hours before the alert went out and 203 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: 47 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 851 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

793 
WUUS51 KBOX 221906
SVRBOX
MAC005-023-221945-
/O.NEW.KBOX.SV.W.0022.210622T1906Z-210622T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
306 PM EDT Tue Jun 22 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Central Plymouth County in southeastern Massachusetts...
  North central Bristol County in southeastern Massachusetts...

* Until 345 PM EDT.

* At 306 PM EDT, a severe thunderstorm was located over Halifax, or
  near Bridgewater, moving northeast at 55 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, Bridgewater, Marshfield, Middleborough, Hingham,
  Scituate, Pembroke, Rockland, Abington, Duxbury, Whitman, Hanover,
  East Bridgewater, Raynham, Kingston, Norwell, Hanson, Cohasset,
  Halifax and West Bridgewater.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4204 7066 4201 7067 4201 7071 4199 7070
      4189 7092 4197 7108 4226 7081 4224 7077
      4225 7077 4220 7072 4220 7071 4217 7071
      4217 7073 4215 7071 4216 7070 4209 7064
      4205 7066 4202 7062
TIME...MOT...LOC 1906Z 231DEG 49KT 4201 7088 

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

BW

1 follow-up statement

229 
WWUS51 KBOX 221929
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
329 PM EDT Tue Jun 22 2021

MAC005-023-221938-
/O.CAN.KBOX.SV.W.0022.000000T0000Z-210622T1945Z/
Plymouth MA-Bristol MA-
329 PM EDT Tue Jun 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL PLYMOUTH AND NORTH
CENTRAL BRISTOL COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved 
offshore. Therefore, the warning has been cancelled.

LAT...LON 4204 7066 4201 7067 4201 7071 4199 7070
      4189 7092 4197 7108 4226 7081 4224 7077
      4225 7077 4220 7072 4220 7071 4217 7071
      4217 7073 4215 7071 4216 7070 4209 7064
      4205 7066 4202 7062
TIME...MOT...LOC 1925Z 231DEG 49KT 4220 7056 

$$

Nocera

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 10:50 PM EDT	Special Weather Statement	BOX	Franklin	40 min
Jun 22, 3:38 AM EDT	Rip Current Statement	BOX	Dukes, Nantucket	15 hr
Jun 22, 1:52 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	38 min
Jun 22, 2:00 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth, Suffolk	45 min
Jun 22, 2:14 PM EDT	Special Marine Warning	BOX		31 min
Jun 22, 2:33 PM EDT	Special Weather Statement	BOX	Plymouth	42 min
Jun 22, 2:43 PM EDT	Special Weather Statement	BOX	Plymouth	32 min
Jun 22, 3:07 PM EDT	Special Marine Warning	BOX		53 min
Jun 22, 3:41 PM EDT	Special Marine Warning	BOX		64 min
Jun 22, 4:42 PM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	48 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2021 Every severe thunderstorm warning in 2021

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.