Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Boston/Norton, MA

June 6, 2020Hampden County, Worcester County, Massachusetts; Providence County, Rhode Island; Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 6, 2020, 2:39 PM EDT for Hampden County, Worcester County, Massachusetts; Providence County, Rhode Island; Northeastern Connecticut Planning Region, Connecticut. It was in force for 66 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 6, 2020, 2:39 PM EDT (18:39 UTC)
Expired: Jun 6, 2020, 3:45 PM EDT
In force: 66 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Northeastern Connecticut Planning Region, CT, Hampden County, MA, Worcester County, MA, Providence County, RI

The radar

The Boston radar (KBOX), 74 km from the middle of the area, began a volume at 18:42 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 6, 3:12 PM EDT	TSTM WND DMG	1 Sse Uxbridge, MA	TREE DOWN ON CAR ON SOUTHWICK ST NEAR MENDON.
Jun 6, 3:16 PM EDT	TSTM WND DMG	Putnam, CT	WIRES DOWNED BY WINDS ON GROVE ST IN PUTNAM
Jun 6, 3:18 PM EDT	TSTM WND DMG	1 Nnw Putnam, CT	TREE DOWN ON A HOUSE ON VIENS ST.
Jun 6, 3:30 PM EDT	TSTM WND DMG	Uxbridge, MA	TREES DOWN ON BAILEY ST

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
Jun 6, 12:23 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.7 hours before the alert went out and 141 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: 390 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 593 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

099 
WUUS51 KBOX 061839
SVRBOX
CTC013-015-MAC013-027-RIC007-061945-
/O.NEW.KBOX.SV.W.0021.200606T1839Z-200606T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
239 PM EDT Sat Jun 6 2020

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northern Windham County in northern Connecticut...
  Northeastern Tolland County in northern Connecticut...
  Southeastern Worcester County in central Massachusetts...
  Southeastern Hampden County in western Massachusetts...
  Northwestern Providence County in Rhode Island...

* Until 345 PM EDT.

* At 239 PM EDT, a severe thunderstorm was located over Stafford, or 
  12 miles north of Mansfield, moving east at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect wind damage to trees and power lines. Minor hail 
           damage to vehicles is possible.

* Locations impacted include...
  Woonsocket, Milford, Smithfield, Killingly, Webster, Southbridge,
  Burrillville, Northbridge, Ellington, Tolland, Oxford, Uxbridge,
  Charlton, Stafford, North Smithfield, Dudley, Glocester, Putnam,
  Thompson and Sturbridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4189 7238 4205 7239 4214 7151 4187 7148
TIME...MOT...LOC 1838Z 265DEG 30KT 4197 7228 

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

BL

4 follow-up statements

507 
WWUS51 KBOX 061854
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
254 PM EDT Sat Jun 6 2020

CTC013-015-MAC013-027-RIC007-061945-
/O.CON.KBOX.SV.W.0021.000000T0000Z-200606T1945Z/
Windham CT-Tolland CT-Worcester MA-Hampden MA-Providence RI-
254 PM EDT Sat Jun 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHERN WINDHAM...NORTHEASTERN TOLLAND...SOUTHEASTERN
WORCESTER...EASTERN HAMPDEN AND NORTHWESTERN PROVIDENCE COUNTIES...

At 253 PM EDT, a severe thunderstorm was located over Woodstock, or
15 miles northeast of Mansfield, moving east at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Expect wind damage to trees and power lines. Minor hail 
         damage to vehicles is possible.

Locations impacted include...
Woonsocket, Milford, Smithfield, Killingly, Webster, Southbridge,
Burrillville, Northbridge, Oxford, Uxbridge, Charlton, Stafford,
North Smithfield, Dudley, Glocester, Putnam, Thompson, Sturbridge,
Blackstone and Sutton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4192 7225 4198 7229 4207 7220 4214 7151
      4187 7148
TIME...MOT...LOC 1853Z 264DEG 38KT 4198 7206 

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

BL

392 
WWUS51 KBOX 061912
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
312 PM EDT Sat Jun 6 2020

CTC013-MAC013-061921-
/O.CAN.KBOX.SV.W.0021.000000T0000Z-200606T1945Z/
Tolland CT-Hampden MA-
312 PM EDT Sat Jun 6 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN TOLLAND AND
EASTERN HAMPDEN COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northern Connecticut...eastern and central Massachusetts...and Rhode
Island.

LAT...LON 4192 7205 4199 7207 4209 7192 4214 7151
      4187 7148
TIME...MOT...LOC 1911Z 265DEG 30KT 4199 7186 

$$

CTC015-MAC027-RIC007-061945-
/O.CON.KBOX.SV.W.0021.000000T0000Z-200606T1945Z/
Windham CT-Worcester MA-Providence RI-
312 PM EDT Sat Jun 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHEASTERN WINDHAM...SOUTHEASTERN WORCESTER AND NORTHWESTERN
PROVIDENCE COUNTIES...

At 311 PM EDT, a severe thunderstorm was located over Thompson, or 18
miles west of Woonsocket, moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Expect wind damage to trees and power lines. Minor hail 
         damage to vehicles is possible.

Locations impacted include...
Woonsocket, Milford, Smithfield, Webster, Southbridge, Burrillville,
Northbridge, Oxford, Uxbridge, North Smithfield, Dudley, Glocester,
Putnam, Thompson, Blackstone, Sutton, Douglas, Woodstock, Upton and
Hopedale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4192 7205 4199 7207 4209 7192 4214 7151
      4187 7148
TIME...MOT...LOC 1911Z 265DEG 30KT 4199 7186 

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

BL

915 
WWUS51 KBOX 061926
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
326 PM EDT Sat Jun 6 2020

CTC015-MAC027-RIC007-061945-
/O.CON.KBOX.SV.W.0021.000000T0000Z-200606T1945Z/
Windham CT-Worcester MA-Providence RI-
326 PM EDT Sat Jun 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHEASTERN WINDHAM...SOUTHEASTERN WORCESTER AND NORTHWESTERN
PROVIDENCE COUNTIES...

At 326 PM EDT, a severe thunderstorm was located over Burrillville,
or 9 miles west of Woonsocket, moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Expect wind damage to trees and power lines. Minor hail 
         damage to vehicles is possible.

Locations impacted include...
Woonsocket, Milford, Smithfield, Webster, Burrillville, Northbridge,
Uxbridge, North Smithfield, Glocester, Thompson, Blackstone, Sutton,
Douglas, Upton, Hopedale, Mendon and Millville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4191 7179 4202 7185 4211 7173 4214 7151
      4187 7148
TIME...MOT...LOC 1926Z 265DEG 30KT 4200 7169 

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

BL

938 
WWUS51 KBOX 061936
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
336 PM EDT Sat Jun 6 2020

CTC015-MAC027-RIC007-061946-
/O.EXP.KBOX.SV.W.0021.000000T0000Z-200606T1945Z/
Windham CT-Worcester MA-Providence RI-
336 PM EDT Sat Jun 6 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WINDHAM...
SOUTHEASTERN WORCESTER AND NORTHWESTERN PROVIDENCE COUNTIES WILL
EXPIRE AT 345 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northern Connecticut...eastern and central Massachusetts...and Rhode
Island.

LAT...LON 4191 7179 4202 7185 4211 7173 4214 7151
      4187 7148
TIME...MOT...LOC 1936Z 265DEG 30KT 4201 7161 

$$

BL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 12:51 PM EDT	Special Weather Statement	BOX	Hampden, Hampshire	39 min
Jun 6, 1:22 PM EDT	Special Weather Statement	BOX	Hampshire	53 min
Jun 6, 1:25 PM EDT	Special Weather Statement	BOX	Franklin	50 min
Jun 6, 1:42 PM EDT	Special Weather Statement	BOX	Hampden	48 min
Jun 6, 1:51 PM EDT	Special Weather Statement	BOX	Worcester	54 min
Jun 6, 2:09 PM EDT	Special Weather Statement	BOX	Hampden, Worcester	51 min
Jun 6, 2:15 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	60 min
Jun 6, 2:32 PM EDT	Special Weather Statement	BOX	Middlesex	43 min
Jun 6, 2:46 PM EDT	Special Weather Statement	BOX	Essex	44 min
Jun 6, 2:51 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Worcester	54 min
Jun 6, 3:02 PM EDT	Special Marine Warning	BOX		58 min
Jun 6, 3:05 PM EDT	Special Weather Statement	BOX	Middlesex, Suffolk	40 min
Jun 6, 3:29 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Suffolk	61 min
Jun 6, 3:34 PM EDT	Special Marine Warning	BOX		56 min
Jun 6, 3:35 PM EDT	Special Marine Warning	BOX		55 min
Jun 6, 3:45 PM EDT	Special Marine Warning	BOX		60 min
Jun 6, 3:51 PM EDT	Special Marine Warning	BOX		54 min
Jun 6, 3:56 PM EDT	Special Weather Statement	BOX	Suffolk	34 min
Jun 6, 4:01 PM EDT	Special Weather Statement	BOX	Bristol	59 min
Jun 6, 4:24 PM EDT	Special Marine Warning	BOX		51 min
Jun 6, 4:32 PM EDT	Special Weather Statement	BOX	Barnstable, Plymouth	43 min
Jun 6, 4:38 PM EDT	Special Marine Warning	BOX		37 min
Jun 6, 4:43 PM EDT	Special Weather Statement	BOX	Bristol	47 min
Jun 6, 5:49 PM EDT	Special Marine Warning	BOX		41 min
Jun 6, 7:07 PM EDT	Special Weather Statement	BOX	Middlesex	38 min
Jun 6, 5:26 PM EDT	Special Weather Statement	BOX	Washington	49 min
Jun 6, 2:43 PM EDT	Special Weather Statement	BOX		47 min
Jun 6, 3:42 PM EDT	Special Weather Statement	BOX		48 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2020 Severe Thunderstorm Warnings in Connecticut, 2020 Severe Thunderstorm Warnings in Rhode Island, 2020 Every severe thunderstorm warning in 2020

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.