Alert archive / Rhode Island / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 52, NWS Boston/Norton, MA

July 6, 2021Northeastern Connecticut Planning Region, Connecticut; 4 counties in Massachusetts; 5 counties in Rhode Island

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 6, 2021, 5:52 PM EDT for Northeastern Connecticut Planning Region, Connecticut; 4 counties in Massachusetts; 5 counties in Rhode Island. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 6, 2021, 5:52 PM EDT (21:52 UTC)
Expired: Jul 6, 2021, 6:45 PM EDT
In force: 53 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Northeastern Connecticut Planning Region, CT, Bristol County, MA, Middlesex County, MA, Norfolk County, MA, Worcester County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 41 km from the middle of the area, began a volume at 21:53 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.

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 6, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.9 hours before the alert went out and 149 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: 230 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

810 
WUUS51 KBOX 062152
SVRBOX
CTC013-015-MAC005-017-021-027-RIC001-003-005-007-009-062245-
/O.NEW.KBOX.SV.W.0052.210706T2152Z-210706T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
552 PM EDT Tue Jul 6 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Windham County in northern Connecticut...
  Southeastern Tolland County in northern Connecticut...
  Southwestern Norfolk County in eastern Massachusetts...
  Southeastern Worcester County in central Massachusetts...
  South central Middlesex County in northeastern Massachusetts...
  Northwestern Bristol County in southeastern Massachusetts...
  Washington County in Rhode Island...
  Central Newport County in Rhode Island...
  Kent County in Rhode Island...
  Providence County in Rhode Island...
  Bristol County in Rhode Island...

* Until 645 PM EDT.

* At 552 PM EDT, severe thunderstorms were located along a line
  extending from near Holliston to Willimantic, moving southeast at
  25 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Providence, Fall River, Warwick, Cranston, Pawtucket, Taunton, East
  Providence, Woonsocket, Coventry, Cumberland, North Providence,
  Franklin, South Kingstown, West Warwick, Johnston, North
  Attleborough, Milford, North Kingstown, Windham and Bristol.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4164 7179 4168 7230 4226 7143 4180 7107
      4165 7121 4172 7116 4172 7126 4164 7122
      4153 7131 4163 7125 4168 7128 4158 7133
      4171 7129 4179 7137 4178 7139 4153 7141
      4153 7134 4136 7149 4131 7188
TIME...MOT...LOC 2152Z 337DEG 21KT 4220 7150 4171 7222 

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

Loconto

3 follow-up statements

006 
WWUS51 KBOX 062221
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
621 PM EDT Tue Jul 6 2021

CTC013-MAC017-062230-
/O.CAN.KBOX.SV.W.0052.000000T0000Z-210706T2245Z/
Tolland CT-Middlesex MA-
621 PM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TOLLAND AND SOUTH
CENTRAL MIDDLESEX COUNTIES IS CANCELLED...

The storms which prompted the warning have 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, central and southeastern
Massachusetts...and Rhode Island.

LAT...LON 4131 7188 4164 7179 4168 7214 4217 7136
      4180 7107 4165 7121 4171 7116 4173 7126
      4172 7127 4164 7122 4153 7131 4168 7128
      4163 7131 4179 7137 4179 7138 4168 7145
      4159 7134 4159 7132 4136 7149
TIME...MOT...LOC 2220Z 337DEG 21KT 4209 7144 4160 7216 

$$

CTC015-MAC005-021-027-RIC001-003-005-007-009-062245-
/O.CON.KBOX.SV.W.0052.000000T0000Z-210706T2245Z/
Windham CT-Norfolk MA-Worcester MA-Bristol MA-Washington RI-
Newport RI-Kent RI-Providence RI-Bristol RI-
621 PM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR SOUTHEASTERN WINDHAM...SOUTHWESTERN NORFOLK...SOUTHEASTERN
WORCESTER...NORTHWESTERN BRISTOL...WASHINGTON...CENTRAL NEWPORT...
KENT...PROVIDENCE AND BRISTOL COUNTIES...

At 620 PM EDT, severe thunderstorms were located along a line 
extending from Franklin to near Jewett City Connecticut, moving 
southeast at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Providence, Fall River, Warwick, Cranston, Pawtucket, Taunton, East
Providence, Woonsocket, Coventry, Cumberland, North Providence,
Franklin, South Kingstown, West Warwick, Johnston, North
Attleborough, North Kingstown, Windham, Bristol and Plainfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4131 7188 4164 7179 4168 7214 4217 7136
      4180 7107 4165 7121 4171 7116 4173 7126
      4172 7127 4164 7122 4153 7131 4168 7128
      4163 7131 4179 7137 4179 7138 4168 7145
      4159 7134 4159 7132 4136 7149
TIME...MOT...LOC 2220Z 337DEG 21KT 4209 7144 4160 7216 

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

Loconto

257 
WWUS51 KBOX 062235
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
635 PM EDT Tue Jul 6 2021

CTC015-MAC027-062245-
/O.CAN.KBOX.SV.W.0052.000000T0000Z-210706T2245Z/
Windham CT-Worcester MA-
635 PM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WINDHAM AND
SOUTHEASTERN WORCESTER COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 4131 7188 4142 7180 4178 7177 4204 7128
      4177 7109 4167 7119 4172 7116 4173 7126
      4172 7127 4153 7131 4167 7129 4179 7138
      4168 7145 4158 7133 4158 7145 4153 7141
      4157 7137 4136 7149
TIME...MOT...LOC 2235Z 337DEG 21KT 4204 7141 4155 7213 

$$

MAC005-021-RIC001-003-005-007-009-062245-
/O.CON.KBOX.SV.W.0052.000000T0000Z-210706T2245Z/
Norfolk MA-Bristol MA-Washington RI-Newport RI-Kent RI-Providence RI-
Bristol RI-
635 PM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR SOUTH CENTRAL NORFOLK...NORTHWESTERN BRISTOL...WASHINGTON...WEST
CENTRAL NEWPORT...KENT...SOUTHEASTERN PROVIDENCE AND BRISTOL
COUNTIES...

At 635 PM EDT, severe thunderstorms were located along a line
extending from near Wrentham to near Norwich, moving southeast at 25
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Providence, Fall River, Warwick, Cranston, Pawtucket, Taunton, East
Providence, Coventry, Cumberland, North Providence, South Kingstown,
West Warwick, Johnston, North Attleborough, North Kingstown, Bristol,
Attleboro, Mansfield, Westerly and Smithfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4131 7188 4142 7180 4178 7177 4204 7128
      4177 7109 4167 7119 4172 7116 4173 7126
      4172 7127 4153 7131 4167 7129 4179 7138
      4168 7145 4158 7133 4158 7145 4153 7141
      4157 7137 4136 7149
TIME...MOT...LOC 2235Z 337DEG 21KT 4204 7141 4155 7213 

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

Loconto

294 
WWUS51 KBOX 062241
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
641 PM EDT Tue Jul 6 2021

MAC005-021-RIC001-003-005-007-009-062251-
/O.EXP.KBOX.SV.W.0052.000000T0000Z-210706T2245Z/
Norfolk MA-Bristol MA-Washington RI-Newport RI-Kent RI-Providence RI-
Bristol RI-
641 PM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NORFOLK...
NORTHWESTERN BRISTOL...WASHINGTON...WEST CENTRAL NEWPORT...KENT...
SOUTHEASTERN PROVIDENCE AND BRISTOL COUNTIES WILL EXPIRE AT 645 PM
EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

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

LAT...LON 4131 7188 4142 7180 4178 7177 4204 7128
      4177 7109 4167 7119 4172 7116 4173 7126
      4172 7127 4153 7131 4167 7129 4179 7138
      4168 7145 4158 7133 4158 7145 4153 7141
      4157 7137 4136 7149
TIME...MOT...LOC 2241Z 337DEG 21KT 4203 7141 4154 7213 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:33 AM EDT	Heat Advisory	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	39 hr
Jul 6, 4:20 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	55 min
Jul 6, 5:00 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	60 min
Jul 6, 5:21 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	42 min
Jul 6, 1:42 AM EDT	Special Weather Statement	BOX	Franklin	33 min
Jul 6, 1:57 AM EDT	Special Weather Statement	BOX	Franklin	33 min
Jul 6, 2:20 AM EDT	Special Weather Statement	BOX	Franklin	25 min
Jul 6, 2:34 AM EDT	Special Weather Statement	BOX	Worcester	41 min
Jul 6, 2:14 PM EDT	Special Weather Statement	BOX	Franklin	46 min
Jul 6, 3:02 PM EDT	Special Weather Statement	BOX	Hampshire	43 min
Jul 6, 3:06 PM EDT	Special Weather Statement	BOX	Hampden	39 min
Jul 6, 3:12 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	63 min
Jul 6, 3:36 PM EDT	Special Weather Statement	BOX	Hampden	39 min
Jul 6, 3:49 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	56 min
Jul 6, 4:13 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	40 min
Jul 6, 4:42 PM EDT	Special Weather Statement	BOX	Middlesex, Worcester	48 min
Jul 6, 4:43 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	62 min
Jul 6, 4:51 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	33 min
Jul 6, 5:13 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk, Worcester	62 min
Jul 6, 5:16 PM EDT	Special Marine Warning	BOX		44 min
Jul 6, 5:19 PM EDT	Special Weather Statement	BOX	Essex	41 min
Jul 6, 5:21 PM EDT	Special Marine Warning	BOX		39 min
Jul 6, 5:54 PM EDT	Special Marine Warning	BOX		66 min
Jul 6, 5:57 PM EDT	Special Marine Warning	BOX		48 min
Jul 6, 6:00 PM EDT	Special Weather Statement	BOX	Essex	30 min
Jul 6, 6:07 PM EDT	Special Marine Warning	BOX		23 min
Jul 6, 6:13 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Suffolk	31 min
Jul 6, 6:37 PM EDT	Special Marine Warning	BOX		23 min
Jul 6, 6:45 PM EDT	Special Weather Statement	BOX	Bristol, Plymouth	45 min
Jul 6, 6:52 PM EDT	Special Marine Warning	BOX		53 min
Jul 6, 6:58 PM EDT	Special Weather Statement	BOX	Washington	32 min

Nearby

Severe Thunderstorm Warnings in Rhode Island, 2021 Severe Thunderstorm Warnings in Massachusetts, 2021 Severe Thunderstorm Warnings in Connecticut, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.