Alert archive / Massachusetts / Tornado Warnings in 2023
Tornado Warning 13, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this tornado warning at Aug 18, 2023, 9:45 AM EDT for Norfolk County, Plymouth County, Massachusetts. It was in force for 21 min. 3 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 18, 2023, 9:45 AM EDT (13:45 UTC)
- Expired
- Aug 18, 2023, 10:06 AM EDT
- In force
- 21 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Norfolk County, MA, Plymouth County, MA
The radar
The Boston radar (KBOX), 26 km from the middle of the area, began a volume at 13:46 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 18, 9:45 AM EDT | TSTM WND DMG | Weymouth, MA | Numerous reports of trees and wires down across the town. |
| Aug 18, 9:45 AM EDT | TSTM WND DMG | Weymouth, MA | Numerous trees and wires down. |
| Aug 18, 9:50 AM EDT | TORNADO | Weymouth, MA | A confirmed tornado touched down in Weymouth MA. An EF-rating and path length will be determined at the completion of the Storm Survey. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Gray, ME (KGYX), launched 12:00Z, 1.8 hours before the alert went out and 202 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
- 64 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 471 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 236 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
781
WFUS51 KBOX 181345
TORBOX
MAC021-023-181445-
/O.NEW.KBOX.TO.W.0013.230818T1345Z-230818T1445Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
945 AM EDT Fri Aug 18 2023
The National Weather Service in Boston/Norton has issued a
* Tornado Warning for...
East central Norfolk County in eastern Massachusetts...
Northern Plymouth County in southeastern Massachusetts...
* Until 1045 AM EDT.
* At 944 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Holbrook, or near Randolph, moving east at 30 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* Locations impacted include...
Brockton, Weymouth, Braintree, Randolph, Stoughton, Marshfield,
Hingham, Canton, Scituate, Pembroke, Rockland, Abington, Whitman,
Hanover, Holbrook, Norwell, Hanson, Cohasset, and Avon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4209 7108 4217 7111 4227 7080 4209 7064
TIME...MOT...LOC 1344Z 253DEG 25KT 4214 7101
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
Dooley2 follow-up statements
237
WWUS51 KBOX 181359
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
959 AM EDT Fri Aug 18 2023
MAC021-023-181445-
/O.CON.KBOX.TO.W.0013.000000T0000Z-230818T1445Z/
Norfolk MA-Plymouth MA-
959 AM EDT Fri Aug 18 2023
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 AM EDT FOR EASTERN
NORFOLK AND NORTHWESTERN PLYMOUTH COUNTIES...
At 958 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Rockland, or near Weymouth, moving east at 30 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Weymouth, Braintree, Marshfield, Hingham, Scituate, Rockland,
Abington, Hanover, Holbrook, Norwell, and Cohasset.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4214 7096 4220 7103 4227 7080 4216 7070
4215 7070
TIME...MOT...LOC 1358Z 253DEG 25KT 4217 7089
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
Dooley170
WWUS51 KBOX 181406
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
1006 AM EDT Fri Aug 18 2023
MAC021-023-181415-
/O.CAN.KBOX.TO.W.0013.000000T0000Z-230818T1445Z/
Norfolk MA-Plymouth MA-
1006 AM EDT Fri Aug 18 2023
...THE TORNADO WARNING FOR EASTERN NORFOLK AND NORTHWESTERN PLYMOUTH
COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
LAT...LON 4214 7096 4220 7103 4227 7080 4216 7070
4215 7070
TIME...MOT...LOC 1404Z 253DEG 25KT 4219 7082
$$
DooleyThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 8:05 AM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Worcester | 55 min |
| Aug 18, 8:26 AM EDT | Flash Flood Warning | BOX | Bristol | 2 hr |
| Aug 18, 8:35 AM EDT | Tornado Warning | BOX | Bristol, Norfolk, Worcester | 40 min |
| Aug 18, 8:50 AM EDT | Severe Thunderstorm Warning | BOX | Bristol | 55 min |
| Aug 18, 8:56 AM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 34 min |
| Aug 18, 9:12 AM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Suffolk | 63 min |
| Aug 18, 9:18 AM EDT | Flash Flood Warning | BOX | Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more | 79 min |
| Aug 18, 9:22 AM EDT | Tornado Warning | BOX | Bristol, Norfolk, Plymouth | 23 min |
| Aug 18, 9:28 AM EDT | Special Marine Warning | BOX | 92 min | |
| Aug 18, 9:36 AM EDT | Flash Flood Warning | BOX | Bristol, Norfolk, Plymouth | 2 hr |
| Aug 18, 10:03 AM EDT | Flash Flood Warning | BOX | Essex, Middlesex | 98 min |
| Aug 18, 10:19 AM EDT | Flash Flood Warning | BOX | Essex, Middlesex | 84 min |
| Aug 18, 10:24 AM EDT | Severe Thunderstorm Warning | BOX | Essex | 24 min |
| Aug 18, 10:25 AM EDT | Special Marine Warning | BOX | 65 min | |
| Aug 18, 10:41 AM EDT | Special Marine Warning | BOX | 64 min | |
| Aug 18, 10:55 AM EDT | River Flood Warning | BOX | Essex | 17 hr |
| Aug 18, 3:33 PM EDT | Special Weather Statement | BOX | Norfolk | 57 min |
| Aug 18, 3:57 PM EDT | Special Marine Warning | BOX | 63 min | |
| Aug 18, 5:28 PM EDT | Special Weather Statement | BOX | Essex | 62 min |
Nearby
Tornado Warnings in Massachusetts, 2023Every tornado warning in 2023Tornadoes in 2023
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.