Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 94, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 27, 2021, 6:33 PM EDT for 6 counties in Massachusetts. It was in force for 57 min. 34 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, 6:33 PM EDT (22:33 UTC)
- Expired
- Jul 27, 2021, 7:30 PM EDT
- In force
- 57 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Essex County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 43 km from the middle of the area, began a volume at 22:36 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, 6:33 PM EDT | TSTM WND DMG | Spencer, MA | TREE DOWN ON WIRES BETWEEN 73 AND 95 MCCORMICK ROAD. RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:38 PM EDT | TSTM WND DMG | Holden, MA | TREE DOWN ON TOP OF A CAR. WIRES DOWN. RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:38 PM EDT | TSTM WND DMG | Worcester, MA | TREE DOWN ON A CAR AT 61 BRIAR LANE. POWER LINES DOWN ON TACOMA STREET AND CLARK STREET. TREE AND WIRES DOWN BLOCKING ROAD ON QUINAPOXET LANE NEAR BERGSTROM ROAD. RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:40 PM EDT | TSTM WND DMG | 2 Wnw Shrewsbury, MA | LARGE TREE DOWNED ON MAIN AND MILL ST IN BOYLSTON. |
| Jul 27, 6:40 PM EDT | TSTM WND DMG | Boylston, MA | 4-5 FOOT DIAMETER TREE DOWN AT CORNER OF MAIN STREET AND PAUL TIVMAN ROAD. LARGE BRANCH DOWN AT THE CORNER OF BELAIR STREET AND MAIN STREET. |
| Jul 27, 6:40 PM EDT | TSTM WND DMG | Shrewsbury, MA | TWO TREES DOWN ON HILLANDO DRIVE NEAR WALNUT STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:45 PM EDT | TSTM WND DMG | Worcester, MA | TREE DOWN PARTIALLY BLOCKING ROAD AT 1222 PLEASANT STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:48 PM EDT | TSTM WND DMG | Northborough, MA | SIDING BLOWN OFF THE SIDE OF A HOUSE ON BRIGHAM STREEET NEAR SOUTH STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:55 PM EDT | TSTM WND DMG | Westborough, MA | TREE AND WIRES DOWN AT 7 ARCH STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 7:00 PM EDT | TSTM WND DMG | Upton, MA | TREE DOWN NEAR 8 NORTH MAIN STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 7:10 PM EDT | TSTM WND DMG | Natick, MA | TREE DOWN ON A HOUSE AT 88 KENDALL LANE. RELAYED BY AMATEUR RADIO. |
| Jul 27, 7:18 PM EDT | TSTM WND DMG | Wellesley, MA | TREE DOWN BLOACKING WALNUT STREET AT WHITTIER ROAD. RELAYED BY AMATEUR RADIO. |
| Jul 27, 7:18 PM EDT | TSTM WND DMG | Wellesley, MA | LARGE BRANCH DOWN NEAR 33 CEDAR STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 7:19 PM EDT | TSTM WND DMG | Sherborn, MA | TREE DOWN ON SOUTH MAIN STREET AT BULLARD ROAD. RLEAYED BY AMATEUR RADIO. |
| Jul 27, 7:21 PM EDT | TSTM WND DMG | 2 Wnw Newton, MA | TREE DOWN ON A CAR ON COMMONWEALTH AVE IN NEWTON |
| Jul 27, 7:21 PM EDT | TSTM WND DMG | Newton, MA | TREE DOWN BLOCKING THE STREET NEAR 19 PARK DRIVE. TREE DOWN ON A HOUSE AT 111 PROSPECT STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 7:21 PM EDT | TSTM WND DMG | Newton, MA | TREE DOWN ON A CAR NEAR 1750 COMMONWEALTH AVE. RELAYED BY AMATEUR RADIO. |
| 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, 7:26 PM EDT | TSTM WND DMG | Waltham, MA | TREE AND WIRES DOWN AT 33 BROWN STREET. RELAYED BY AMATEUR RADIO. |
| 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 | 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. |
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, 10.6 hours before the alert went out and 185 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.
- 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
The text
As transmitted.
012
WUUS51 KBOX 272233
SVRBOX
MAC009-017-021-023-025-027-272330-
/O.NEW.KBOX.SV.W.0094.210727T2233Z-210727T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
633 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...
South central Essex County in northeastern Massachusetts...
Eastern Worcester County in central Massachusetts...
Middlesex County in northeastern Massachusetts...
Northwestern Plymouth County in southeastern Massachusetts...
* Until 730 PM EDT.
* At 632 PM EDT, severe thunderstorms were located along a line
extending from near Fitchburg to Leicester, moving east at 40 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Boston, Worcester, Cambridge, Brockton, Quincy, Newton, Somerville,
Framingham, Waltham, Malden, Brookline, Medford, Weymouth, Revere,
Arlington, Everett, Leominster, Fitchburg, Billerica and
Marlborough.
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.
&&
LAT...LON 4259 7104 4247 7105 4244 7096 4241 7099
4236 7096 4238 7105 4233 7101 4230 7105
4229 7102 4232 7101 4228 7102 4226 7097
4232 7093 4226 7096 4223 7091 4215 7093
4205 7119 4215 7208 4264 7183
TIME...MOT...LOC 2232Z 279DEG 34KT 4256 7179 4221 7192
HAIL...0.88IN
WIND...60MPH
$$
Loconto/Gaucher3 follow-up statements
782
WWUS51 KBOX 272257
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
657 PM EDT Tue Jul 27 2021
MAC009-017-021-023-025-027-272330-
/O.CON.KBOX.SV.W.0094.000000T0000Z-210727T2330Z/
Suffolk MA-Norfolk MA-Essex MA-Worcester MA-Middlesex MA-Plymouth MA-
657 PM EDT Tue Jul 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SUFFOLK...NORFOLK...SOUTH CENTRAL ESSEX...EASTERN WORCESTER...
MIDDLESEX AND NORTHWESTERN PLYMOUTH COUNTIES...
At 656 PM EDT, severe thunderstorms were located along a line
extending from Ayer to Auburn, moving east at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters. Multiple trees and powerlines
been downed in Worcester from these severe thunderstorms.
In addition, a 52 mph wind gust was reported at Worcester
Airport at 633 PM.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Boston, Worcester, Cambridge, Brockton, Quincy, Newton, Somerville,
Framingham, Waltham, Malden, Brookline, Medford, Weymouth, Revere,
Arlington, Everett, Leominster, Fitchburg, Billerica and Marlborough.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4259 7104 4247 7105 4244 7096 4241 7099
4236 7096 4238 7105 4233 7101 4230 7105
4229 7102 4232 7101 4228 7102 4226 7097
4232 7093 4226 7096 4223 7091 4215 7093
4205 7119 4215 7208 4264 7183
TIME...MOT...LOC 2256Z 279DEG 32KT 4254 7159 4217 7184
HAIL...1.00IN
WIND...60MPH
$$
Loconto/Gaucher770
WWUS51 KBOX 272314
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
714 PM EDT Tue Jul 27 2021
MAC009-017-021-023-025-027-272330-
/O.CON.KBOX.SV.W.0094.000000T0000Z-210727T2330Z/
Suffolk MA-Norfolk MA-Essex MA-Worcester MA-Middlesex MA-Plymouth MA-
714 PM EDT Tue Jul 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SUFFOLK...NORFOLK...SOUTH CENTRAL ESSEX...SOUTHEASTERN
WORCESTER...MIDDLESEX AND NORTHWESTERN PLYMOUTH COUNTIES...
At 713 PM EDT, severe thunderstorms were located along a line
extending from Littleton to near Sutton, moving east at 40 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Trained weather spotters. Multiple trees and powerlines
have been downed in Worcester and Westborough from these
severe thunderstorms.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Boston, Worcester, Cambridge, Brockton, Quincy, Newton, Somerville,
Framingham, Waltham, Malden, Brookline, Medford, Weymouth, Revere,
Arlington, Everett, Billerica, Marlborough, Woburn and Braintree.
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 4259 7104 4247 7105 4244 7096 4241 7099
4236 7096 4238 7105 4233 7101 4230 7105
4229 7102 4232 7101 4228 7102 4226 7097
4232 7093 4226 7096 4223 7091 4215 7093
4205 7119 4215 7208 4261 7138
TIME...MOT...LOC 2313Z 279DEG 34KT 4253 7146 4216 7171
HAIL...0.88IN
WIND...60MPH
$$
Loconto996
WWUS51 KBOX 272328
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
728 PM EDT Tue Jul 27 2021
MAC009-017-021-023-025-027-272338-
/O.EXP.KBOX.SV.W.0094.000000T0000Z-210727T2330Z/
Suffolk MA-Norfolk MA-Essex MA-Worcester MA-Middlesex MA-Plymouth MA-
728 PM EDT Tue Jul 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SUFFOLK...NORFOLK...SOUTH
CENTRAL ESSEX...SOUTHEASTERN WORCESTER...MIDDLESEX AND NORTHWESTERN
PLYMOUTH COUNTIES WILL EXPIRE AT 730 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
eastern, central, southeastern and northeastern Massachusetts.
LAT...LON 4259 7104 4247 7105 4244 7096 4241 7099
4236 7096 4238 7105 4233 7101 4230 7105
4229 7102 4232 7101 4228 7102 4226 7097
4232 7093 4226 7096 4223 7091 4215 7093
4205 7119 4215 7208 4261 7138
TIME...MOT...LOC 2328Z 279DEG 34KT 4251 7127 4214 7153
$$
Loconto/GaucherThe 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, 6:50 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, 7:26 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more | 64 min |
| Jul 27, 7:39 PM EDT | Special Marine Warning | BOX | 66 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2021Every 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.