Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 113, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 23, 2020, 4:34 PM EDT for 5 counties in Massachusetts. It was in force for 56 min. 9 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
- Aug 23, 2020, 4:34 PM EDT (20:34 UTC)
- Expired
- Aug 23, 2020, 5:30 PM EDT
- In force
- 56 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Essex County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 63 km from the middle of the area, began a volume at 20:37 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 |
|---|---|---|---|
| Aug 23, 4:45 PM EDT | TSTM WND DMG | Stoneham, MA | TREE DOWN ON CAR ON FRANKLIN ST |
| Aug 23, 4:45 PM EDT | TSTM WND DMG | Wakefield, MA | TREES DOWN ON AVON AVE, GREEN ST. TREE DOWN ON HOUSE ON MAIN ST AT LAKE |
| Aug 23, 4:45 PM EDT | HAIL 1 | Wakefield, MA | |
| Aug 23, 4:50 PM EDT | TSTM WND DMG | Wakefield, MA | TREE DOWN ON COMMUTER RAIL TRAIN TRACKS CAUSING DELAYS. |
| Aug 23, 4:50 PM EDT | TSTM WND DMG | Wakefield, MA | MYRTLE AVE BLOCKED BY 5 LARGE TREES - 4 DIAMETER |
| Aug 23, 4:55 PM EDT | HAIL 0.75 | Lynn, MA | |
| Aug 23, 5:00 PM EDT | HAIL 0.75 | Boston, MA | HYDE PARK SECTION OF BOSTON |
| Aug 23, 5:05 PM EDT | TSTM WND DMG | Saugus, MA | TREE DOWN ON WIRES ON HOBSON ST |
| Aug 23, 5:06 PM EDT | TSTM WND DMG | Malden, MA | TREE DOWN ON RTE 99 JUST BEFORE US RTE 1 |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Chatham, MA (KCHH), launched 12:00Z, 8.6 hours before the alert went out and 121 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
- 20 J/kg
- Mixed-layer CIN
- -159 J/kg
- Mixed-layer LCL
- 1231 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
056
WUUS51 KBOX 232034
SVRBOX
MAC009-017-021-025-027-232130-
/O.NEW.KBOX.SV.W.0113.200823T2034Z-200823T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
434 PM EDT Sun Aug 23 2020
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Suffolk County in eastern Massachusetts...
North central Norfolk County in eastern Massachusetts...
Southern Essex County in northeastern Massachusetts...
East central Worcester County in central Massachusetts...
Southeastern Middlesex County in northeastern Massachusetts...
* Until 530 PM EDT.
* At 433 PM EDT, a severe thunderstorm was located over Reading, or
near Woburn, moving east at 15 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...
Boston, Cambridge, Lynn, Newton, Somerville, Framingham, Waltham,
Malden, Brookline, Medford, Revere, Peabody, Arlington, Everett,
Salem, Billerica, Beverly, Marlborough, Woburn and Chelsea.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4270 7079 4264 7076 4269 7062 4258 7066
4261 7066 4253 7078 4254 7090 4253 7088
4244 7093 4242 7091 4245 7097 4233 7089
4238 7105 4232 7100 4231 7104 4231 7097
4219 7169 4255 7126 4272 7078
TIME...MOT...LOC 2033Z 266DEG 12KT 4255 7112
HAIL...1.00IN
WIND...60MPH
$$
Frank2 follow-up statements
210
WWUS51 KBOX 232042
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
442 PM EDT Sun Aug 23 2020
MAC009-017-021-025-027-232130-
/O.CON.KBOX.SV.W.0113.000000T0000Z-200823T2130Z/
Suffolk MA-Norfolk MA-Essex MA-Worcester MA-Middlesex MA-
442 PM EDT Sun Aug 23 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SUFFOLK...NORTH CENTRAL NORFOLK...SOUTHERN ESSEX...EAST CENTRAL
WORCESTER AND SOUTHEASTERN MIDDLESEX COUNTIES...
At 440 PM EDT, a severe thunderstorm was located over Reading, or
near Woburn, moving east at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters have indicated numerous reports of
wind damage and downed trees across parts of this region
over the past hour. Current radar indicates strong winds
will be entering Watertown, Stoneham, Melrose, Cambridge
and Boston.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Boston, Cambridge, Lynn, Newton, Somerville, Framingham, Waltham,
Malden, Brookline, Medford, Revere, Peabody, Arlington, Everett,
Salem, Billerica, Beverly, Marlborough, Woburn and Chelsea.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4270 7079 4264 7076 4269 7062 4258 7066
4261 7066 4253 7078 4254 7090 4253 7088
4244 7093 4242 7091 4245 7097 4233 7089
4238 7105 4232 7100 4231 7104 4231 7097
4219 7169 4255 7126 4272 7078
TIME...MOT...LOC 2040Z 266DEG 12KT 4255 7109
HAIL...1.00IN
WIND...60MPH
$$
Frank331
WWUS51 KBOX 232116
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
516 PM EDT Sun Aug 23 2020
MAC009-017-021-025-027-232130-
/O.CON.KBOX.SV.W.0113.000000T0000Z-200823T2130Z/
Suffolk MA-Norfolk MA-Essex MA-Worcester MA-Middlesex MA-
516 PM EDT Sun Aug 23 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SUFFOLK...NORTH CENTRAL NORFOLK...SOUTHEASTERN ESSEX...EAST
CENTRAL WORCESTER AND SOUTHEASTERN MIDDLESEX COUNTIES...
At 514 PM EDT, a severe thunderstorm was located over Lynn, moving
east at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters continue to report pockets of
significant wind damage and downed trees across central and
northeast Massachusetts. Seek an indoor shelter immediately.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Boston, Cambridge, Lynn, Newton, Somerville, Framingham, Waltham,
Malden, Brookline, Medford, Revere, Peabody, Arlington, Everett,
Salem, Beverly, Chelsea, Natick, Watertown and Lexington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4240 7128 4264 7065 4258 7066 4261 7066
4253 7078 4254 7084 4253 7088 4244 7093
4242 7091 4245 7097 4244 7096 4245 7099
4233 7089 4238 7105 4232 7100 4231 7104
4231 7097 4219 7169 4240 7140
TIME...MOT...LOC 2114Z 265DEG 12KT 4248 7094
HAIL...1.00IN
WIND...60MPH
$$
FrankThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 1:50 PM EDT | Special Weather Statement | BOX | Franklin | 25 min |
| Aug 23, 2:17 PM EDT | Special Weather Statement | BOX | Franklin | 43 min |
| Aug 23, 2:21 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Worcester | 54 min |
| Aug 23, 2:36 PM EDT | Special Weather Statement | BOX | Essex | 39 min |
| Aug 23, 3:14 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Middlesex, Worcester | 61 min |
| Aug 23, 3:47 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Franklin, Middlesex, Worcester | 58 min |
| Aug 23, 4:01 PM EDT | Areal Flood Warning | BOX | Essex | 119 min |
| Aug 23, 4:05 PM EDT | Special Marine Warning | BOX | 85 min | |
| Aug 23, 4:12 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 63 min |
| Aug 23, 4:39 PM EDT | Special Marine Warning | BOX | 96 min | |
| Aug 23, 4:44 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 50 min |
| Aug 23, 4:55 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 65 min |
| Aug 23, 5:04 PM EDT | Areal Flood Warning | BOX | Essex, Middlesex, Plymouth, Suffolk | 116 min |
| Aug 23, 5:07 PM EDT | Special Marine Warning | BOX | 83 min | |
| Aug 23, 5:12 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex, Norfolk, Plymouth, Suffolk | 63 min |
| Aug 23, 5:17 PM EDT | Areal Flood Warning | BOX | Middlesex, Worcester | 118 min |
| Aug 23, 5:28 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire, Worcester | 62 min |
| Aug 23, 5:38 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester | 52 min |
| Aug 23, 5:47 PM EDT | Flash Flood Warning | BOX | Middlesex, Norfolk, Suffolk, Worcester | 118 min |
| Aug 23, 6:03 PM EDT | Special Weather Statement | BOX | Worcester | 42 min |
| Aug 23, 6:10 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Norfolk, Plymouth | 49 min |
| Aug 23, 6:11 PM EDT | Special Marine Warning | BOX | 51 min | |
| Aug 23, 6:15 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 60 min |
| Aug 23, 6:20 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Norfolk, Plymouth, Worcester | 40 min |
| Aug 23, 6:26 PM EDT | Flash Flood Warning | BOX | Bristol, Norfolk, Plymouth, Suffolk | 2 hr |
| Aug 23, 6:32 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 58 min |
| Aug 23, 6:39 PM EDT | Areal Flood Warning | BOX | Bristol, Norfolk, Worcester | 2 hr |
| Aug 23, 6:50 PM EDT | Special Marine Warning | BOX | 36 min | |
| Aug 23, 6:55 PM EDT | Flash Flood Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 2 hr |
| Aug 23, 7:22 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire, Worcester | 53 min |
| Aug 23, 7:43 PM EDT | Areal Flood Warning | BOX | Middlesex, Norfolk, Suffolk, Worcester | 2 hr |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2020Every 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.