Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 96, NWS Boston/Norton, MA

July 27, 20217 counties in Massachusetts; Providence County, Rhode Island

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 27, 2021, 7:26 PM EDT for 7 counties in Massachusetts; Providence County, Rhode Island. It was in force for 64 min. 19 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 27, 2021, 7:26 PM EDT (23:26 UTC)
Expired: Jul 27, 2021, 8:30 PM EDT
In force: 64 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Bristol County, MA, Essex County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Providence County, RI

The radar

The Boston radar (KBOX), 56 km from the middle of the area, began a volume at 23:29 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 27, 7:26 PM EDT	TSTM WND DMG	Brighton, MA	BRANCHES DOWN ON THE MASS PIKE (I-90) NEAR THE NEWTON LINE.
Jul 27, 7:27 PM EDT	TSTM WND DMG	1 Nw Allston, MA	TREE DOWN ON A CAR ON EVERETT ST
Jul 27, 7:27 PM EDT	TSTM WND DMG	1 Wnw Dover, MA	TREE DOWN ON HAVEN ST AND CHURCH ST INTESECTION IN DOVER. RELAYED BY AMATEUR RADIO.
Jul 27, 7:27 PM EDT	TSTM WND DMG	1 Wsw East Boston, MA	TREE DOWN NEAR THE CHANNEL 7 NEWS STATION ON BULLFINCH PLACE.
Jul 27, 7:27 PM EDT	TSTM WND DMG	Boston, MA	TREE DOWN ACROSS CRICUIT DRIVE; POWER LINES DOWN ON NEPONSET VALLEY PARKWAY, TWO TREES DOWN ON 400 BLOCK OF MARLBORO STREET, LARGE BRANCH DOWN ON CAR ON 1300 BLOCK OF COMMONWEALTH AVE, LARGE TREE DOWN ON CARS ON JAMAICA STREET, LARGE BRANCH ON WIRES ON CORMAN
Jul 27, 7:27 PM EDT	TSTM WND DMG	Brighton, MA	POWER LINES DOWN ON CUMMINGS ROAD. RELAYED BY AMATEUR RADIO.
Jul 27, 7:27 PM EDT	TSTM WND DMG	Cambridge, MA	TREE DOWN ON FRESH POND PARKWAY. TREE DOWN AND BLOCKING ANTRIM STREET. RELAYED BY AMATEUR RADIO.
Jul 27, 7:27 PM EDT	TSTM WND DMG	Dorchester, MA	POWER LINES DOWN ON WALES STREET. RELAYED BY AMATEUR RADIO.
Jul 27, 7:27 PM EDT	TSTM WND DMG	Newton, MA	TREE DOWN ON ADAMS STREET AT WILTSHIRE ROAD. RELAYED BY AMATEUR RADIO.
Jul 27, 7:27 PM EDT	TSTM WND DMG	Roslindale, MA	LARGE BRANCH DOWN ON LOWER SOUTH STREET NEXT TO ARNOLD STREET. RELAYED BY AMATEUR RADIO.
Jul 27, 7:30 PM EDT	TSTM WND DMG	Somerville, MA	TREE DOWN ON HOUSE IN THE AREA OF 101 PEARL STREET. SMALL TREE DOWN ON CAR ON BONAIR STREET. RELAYED BY AMATEUR RADIO.
Jul 27, 7:34 PM EDT	TSTM WND DMG	Medford, MA	TREE DOWN IN THE ROADWAY ON CRUSHING STREET. TREE DOWN ON CAR ON CLINTON STREET. TREE DOWN ON CARBERRY STREET. TREE AND WIRES DOWN AND LEANING ON A HOUSE ON GOVERNORS AVE. RELAYED BY AMATEUR RADIO.
Jul 27, 7:36 PM EDT	TSTM WND DMG	1 S Brighton, MA	TREE DOWN ON ENGLEWOOD AVE IN BRIGHTON. RELAYED BY AMATEUR RADIO.
Jul 27, 7:40 PM EDT	TSTM WND DMG	1 Ssw Quincy, MA	TREE DOWN ON 49 NELSON ST IN QUINCY. RELAYED BY AMATEUR RADIO
Jul 27, 7:40 PM EDT	TSTM WND DMG	3 Ene Cumberland, RI	DIAMOND HILL ROAD AND NATE WHIPPLE HIGHWAY, TREE DOWN AND BLOCKING HALF THE ROAD.
Jul 27, 7:40 PM EDT	TSTM WND DMG	3 Ene Cumberland, RI	DIAMOND HILL ROAD AND NATE WHIPPLE HIGHWAY, TREE DOWN AND BLOCKING HALF THE ROAD. REPORT RELAYED BY AMATEUR RADIO.
Jul 27, 7:40 PM EDT	TSTM WND DMG	Quincy, MA	TREE DOWN ON CAR ON EVANS AND WEST SQUANTUM STREETS, PERSON TRAPPED AND EXTRICATED, UNINJURED. RELAYED BY AMATEUR RADIO.
Jul 27, 7:40 PM EDT	TSTM WND DMG	Quincy, MA	TREE DOWN BLOCKING ROAD ON FURNACE BROOK PKWY IN QUINCY. RELAYED BY AMATEUR RADIO.
Jul 27, 7:45 PM EDT	TSTM WND DMG	Cumberland, RI	TOP THIRD OF LARGE PINE TREE SNAPPED OFF AT THE 30 BLOCK OF RHODE ISLAND AVE. TOP OF TREE CAUSED DAMAGE TO A WORK VAN, BOAT, AND FENCE. SMALLER LIMBS LANDED ON THE POWER LINE AND CAUGHT FIRE. NATIONAL GRID DID CUT POWER FOR AN HOUR TO THE AREA TO REMOVE LIMBS

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 27, 2:47 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 11.4 hours before the alert went out and 171 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1443 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

552 
WUUS51 KBOX 272326
SVRBOX
MAC005-009-017-021-023-025-027-RIC007-280030-
/O.NEW.KBOX.SV.W.0096.210727T2326Z-210728T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
726 PM EDT Tue Jul 27 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Suffolk County in eastern Massachusetts...
  Norfolk County in eastern Massachusetts...
  Central Essex County in northeastern Massachusetts...
  Southeastern Worcester County in central Massachusetts...
  Southeastern Middlesex County in northeastern Massachusetts...
  Northwestern Plymouth County in southeastern Massachusetts...
  Northwestern Bristol County in southeastern Massachusetts...
  Northeastern Providence County in Rhode Island...

* Until 830 PM EDT.

* At 725 PM EDT, severe thunderstorms were located along a line
  extending from Rowley to Woonsocket, moving southeast at 30 mph.

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

  SOURCE...Radar indicated. These storms have a history of producing 
           downed trees and powerlines in Worcester, Wellesley and 
           Westborough. 

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

* Locations impacted include...
  Boston, Cambridge, Brockton, Quincy, Lynn, Newton, Somerville,
  Waltham, Malden, Brookline, Medford, Taunton, Weymouth, Revere,
  Peabody, Arlington, Everett, Salem, Woonsocket and Beverly.

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 4280 7086 4264 7076 4266 7060 4258 7066
      4259 7066 4260 7065 4254 7090 4254 7087
      4242 7091 4243 7091 4246 7094 4236 7097
      4237 7105 4230 7105 4225 7088 4234 7088
      4226 7087 4214 7069 4179 7100 4199 7160
TIME...MOT...LOC 2325Z 307DEG 27KT 4273 7089 4200 7153 

HAIL...0.88IN
WIND...60MPH
 
$$

Loconto/Gaucher

3 follow-up statements

717 
WWUS51 KBOX 272346
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
746 PM EDT Tue Jul 27 2021

MAC005-009-017-021-023-025-027-RIC007-280030-
/O.CON.KBOX.SV.W.0096.000000T0000Z-210728T0030Z/
Suffolk MA-Norfolk MA-Essex MA-Worcester MA-Middlesex MA-Plymouth MA-
Bristol MA-Providence RI-
746 PM EDT Tue Jul 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR SUFFOLK...NORFOLK...CENTRAL ESSEX...SOUTHEASTERN WORCESTER...
SOUTHEASTERN MIDDLESEX...NORTHWESTERN PLYMOUTH...NORTHWESTERN BRISTOL
AND NORTHEASTERN PROVIDENCE COUNTIES...

At 743 PM EDT, severe thunderstorms were located along a line
extending from near Ipswich to Cumberland, moving southeast at 30
mph.

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

SOURCE...Radar indicated. Multiple trees and powerlines have been 
         downed in Newton, Waltham, Cambridge, Brookline and Dover. 
         In addition, at 735 PM a 61 mph wind gust was reported at 
         the Boston Logan International Airport.

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

Locations impacted include...
Boston, Cambridge, Brockton, Quincy, Lynn, Newton, Somerville,
Waltham, Malden, Brookline, Medford, Taunton, Weymouth, Revere,
Peabody, Arlington, Everett, Salem, Woonsocket and Beverly.

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 4280 7086 4264 7076 4266 7060 4258 7066
      4259 7066 4260 7065 4254 7090 4254 7087
      4242 7091 4243 7091 4246 7094 4236 7097
      4237 7105 4230 7105 4225 7088 4234 7088
      4226 7087 4214 7069 4179 7100 4199 7160
TIME...MOT...LOC 2343Z 307DEG 27KT 4268 7080 4195 7144 

HAIL...0.88IN
WIND...60MPH
 
$$

Loconto

150 
WWUS51 KBOX 280005
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
805 PM EDT Tue Jul 27 2021

MAC009-017-025-027-RIC007-280014-
/O.CAN.KBOX.SV.W.0096.000000T0000Z-210728T0030Z/
Suffolk MA-Essex MA-Worcester MA-Middlesex MA-Providence RI-
805 PM EDT Tue Jul 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR SUFFOLK...CENTRAL ESSEX...
SOUTHEASTERN WORCESTER...SOUTHEASTERN MIDDLESEX AND NORTHEASTERN
PROVIDENCE 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 1000 PM EDT for
eastern and southeastern Massachusetts.

LAT...LON 4179 7100 4192 7138 4193 7138 4228 7118
      4223 7113 4226 7111 4227 7106 4230 7104
      4227 7099 4227 7095 4225 7096 4226 7094
      4225 7088 4229 7088 4214 7069
TIME...MOT...LOC 0004Z 307DEG 27KT 4263 7071 4190 7135 

$$

MAC005-021-023-280030-
/O.CON.KBOX.SV.W.0096.000000T0000Z-210728T0030Z/
Norfolk MA-Plymouth MA-Bristol MA-
805 PM EDT Tue Jul 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR EASTERN NORFOLK...NORTHWESTERN PLYMOUTH AND NORTHWESTERN BRISTOL
COUNTIES...

At 804 PM EDT, severe thunderstorms were located along a line
extending from Gloucester to near Pawtucket, moving southeast at 30
mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters. Multiple trees and powerlines 
         were downed from these storms in Greater Boston and 
         Metrowest, as well as Hingham and Hull.

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

Locations impacted include...
Boston, Brockton, Quincy, Taunton, Weymouth, Braintree, Randolph,
North Attleborough, Norwood, Milton, Stoughton, Bridgewater,
Marshfield, Attleboro, Dedham, Walpole, Mansfield, Middleborough,
Easton and Hingham.

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 4179 7100 4192 7138 4193 7138 4228 7118
      4223 7113 4226 7111 4227 7106 4230 7104
      4227 7099 4227 7095 4225 7096 4226 7094
      4225 7088 4229 7088 4214 7069
TIME...MOT...LOC 0004Z 307DEG 27KT 4263 7071 4190 7135 

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

Loconto

293 
WWUS51 KBOX 280023
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
823 PM EDT Tue Jul 27 2021

MAC005-021-023-280033-
/O.EXP.KBOX.SV.W.0096.000000T0000Z-210728T0030Z/
Norfolk MA-Plymouth MA-Bristol MA-
823 PM EDT Tue Jul 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN NORFOLK...NORTHWESTERN
PLYMOUTH AND NORTHWESTERN BRISTOL COUNTIES WILL EXPIRE AT 830 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 1000 PM EDT for
eastern and southeastern Massachusetts.

LAT...LON 4179 7100 4192 7138 4193 7138 4228 7118
      4223 7113 4226 7111 4227 7106 4230 7104
      4227 7099 4227 7095 4225 7096 4226 7094
      4225 7088 4229 7088 4214 7069
TIME...MOT...LOC 0023Z 307DEG 27KT 4257 7060 4184 7124 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 4:48 PM EDT	Special Weather Statement	BOX	Franklin	27 min
Jul 27, 4:59 PM EDT	Special Weather Statement	BOX	Hampshire	31 min
Jul 27, 5:04 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	56 min
Jul 27, 5:15 PM EDT	Special Weather Statement	BOX	Franklin	30 min
Jul 27, 5:34 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	56 min
Jul 27, 6:01 PM EDT	Special Weather Statement	BOX	Worcester	29 min
Jul 27, 6:33 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Plymouth, Suffolk, Worcester	57 min
Jul 27, 6:50 PM EDT	Special Weather Statement	BOX	Essex	25 min
Jul 27, 6:52 PM EDT	Special Marine Warning	BOX		53 min
Jul 27, 7:01 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	44 min
Jul 27, 7:11 PM EDT	Special Marine Warning	BOX		94 min
Jul 27, 7:39 PM EDT	Special Marine Warning	BOX		66 min
Jul 27, 7:21 PM EDT	Special Weather Statement	BOX	Kent	39 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2021 Severe Thunderstorm Warnings in Rhode Island, 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.