Alert archive / Massachusetts / Tornado Warnings in 2023

Tornado Warning 9, NWS Boston/Norton, MA

August 8, 2023Barnstable County, Bristol County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Aug 8, 2023, 11:18 AM EDT for Barnstable County, Bristol County, Plymouth County, Massachusetts. It was in force for 27 min. 4 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 8, 2023, 11:18 AM EDT (15:18 UTC)
Expired
Aug 8, 2023, 11:45 AM EDT
In force
27 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Barnstable County, MA, Bristol County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 38 km from the middle of the area, began a volume at 15:18 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

TimeReportWhereRemark
Aug 8, 11:20 AM EDTTSTM WND DMG2 Nw Mattapoisett, MAtrees and wires down on North Street around Eldorado Dr. relayed by amateur radio.
Aug 8, 11:20 AM EDTTSTM WND DMG2 Wnw Mattapoisett, MAtrees down on Acushent Rd. Relayed by amateur radio.
Aug 8, 11:20 AM EDTTSTM WND DMG2 Wnw Mattapoisett, MATrees and wires down on Hereford Hill Rd. Relayed by amateur radio.
Aug 8, 11:20 AM EDTTORNADO2 Wnw Mattapoisett, MACorrects previous tornado report from 2 WNW Mattapoisett. A small EF-1 tornado touched down in the town of Mattapoisett Massachusetts at 11:20 AM EDT. The storm was on the ground for approximately 3 minutes. The storm moved to the northeast at approximately 20

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 3.3 hours before the alert went out and 199 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2023-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 331 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2023-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
331 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
680 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted.

461 
WFUS51 KBOX 081518
TORBOX
MAC001-005-023-081545-
/O.NEW.KBOX.TO.W.0009.230808T1518Z-230808T1545Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
1118 AM EDT Tue Aug 8 2023

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Western Barnstable County in southeastern Massachusetts...
  Southeastern Plymouth County in southeastern Massachusetts...
  East central Bristol County in southeastern Massachusetts...

* Until 1145 AM EDT.
    
* At 1118 AM EDT, a severe thunderstorm capable of producing a
  tornado was located over Mattapoisett, or near Marion, moving
  northeast at 20 mph.

  HAZARD...Tornado.

  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.

* This dangerous storm will be near...
  Marion, Middleborough, Wareham, Acushnet, Mattapoisett, and 
  Rochester around 1125 AM EDT.

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 4164 7086 4168 7093 4196 7078 4179 7050
TIME...MOT...LOC 1518Z 218DEG 18KT 4168 7085 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

BL
1 follow-up statement
943 
WWUS51 KBOX 081530
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
1130 AM EDT Tue Aug 8 2023

MAC005-081540-
/O.CAN.KBOX.TO.W.0009.000000T0000Z-230808T1545Z/
Bristol MA-
1130 AM EDT Tue Aug 8 2023

...THE TORNADO WARNING FOR EAST CENTRAL BRISTOL COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 4167 7079 4167 7083 4171 7087 4193 7074
      4179 7050
TIME...MOT...LOC 1530Z 236DEG 15KT 4171 7079 

$$

MAC001-023-081545-
/O.CON.KBOX.TO.W.0009.000000T0000Z-230808T1545Z/
Barnstable MA-Plymouth MA-
1130 AM EDT Tue Aug 8 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1145 AM EDT FOR WESTERN
BARNSTABLE AND SOUTHEASTERN PLYMOUTH COUNTIES...
    
At 1130 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Marion, moving northeast at 20 mph.

HAZARD...Tornado.

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.

This dangerous storm will be near...
  Plymouth, Marion, Middleborough, Wareham, Bourne, Carver, and 
  Rochester around 1135 AM EDT.

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 4167 7079 4167 7083 4171 7087 4193 7074
      4179 7050
TIME...MOT...LOC 1530Z 236DEG 15KT 4171 7079 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

BL

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 3:10 AM EDTFlood WatchBOXBristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more15 hr
Aug 8, 6:37 AM EDTSpecial Weather StatementBOXEssex23 min
Aug 8, 6:58 AM EDTSpecial Weather StatementBOXMiddlesex47 min
Aug 8, 7:37 AM EDTSpecial Weather StatementBOXEssex38 min
Aug 8, 8:09 AM EDTSpecial Weather StatementBOXMiddlesex66 min
Aug 8, 8:25 AM EDTSpecial Marine WarningBOX65 min
Aug 8, 8:58 AM EDTTornado WarningBOXMiddlesex, Worcester32 min
Aug 8, 9:16 AM EDTAreal Flood WarningBOXEssex, Middlesex, Norfolk, Worcester4 hr
Aug 8, 9:17 AM EDTSevere Thunderstorm WarningBOXBristol, Plymouth58 min
Aug 8, 9:19 AM EDTSpecial Marine WarningBOX56 min
Aug 8, 9:28 AM EDTSpecial Marine WarningBOX62 min
Aug 8, 9:29 AM EDTSpecial Weather StatementBOXEssex61 min
Aug 8, 10:01 AM EDTSpecial Weather StatementBOXEssex, Middlesex, Norfolk, Suffolk44 min
Aug 8, 10:07 AM EDTSevere Thunderstorm WarningBOXBristol, Plymouth53 min
Aug 8, 10:12 AM EDTSpecial Marine WarningBOX63 min
Aug 8, 10:21 AM EDTSevere Thunderstorm WarningBOXBristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk54 min
Aug 8, 10:28 AM EDTSpecial Marine WarningBOX62 min
Aug 8, 10:47 AM EDTFlash Flood WarningBOXBristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more3 hr
Aug 8, 10:48 AM EDTSevere Thunderstorm WarningBOXBarnstable, Bristol, Dukes, Plymouth57 min
Aug 8, 11:11 AM EDTSpecial Marine WarningBOX64 min
Aug 8, 11:12 AM EDTSpecial Weather StatementBOXEssex63 min
Aug 8, 11:13 AM EDTSpecial Marine WarningBOX62 min
Aug 8, 11:37 AM EDTSevere Thunderstorm WarningBOXBarnstable, Dukes, Plymouth53 min
Aug 8, 11:52 AM EDTSpecial Marine WarningBOX53 min
Aug 8, 11:53 AM EDTTornado WarningBOXBarnstable37 min
Aug 8, 12:06 PM EDTRiver Flood WarningBOXEssex6 hr
Aug 8, 12:19 PM EDTSevere Thunderstorm WarningBOXBarnstable41 min
Aug 8, 12:39 PM EDTSpecial Marine WarningBOX66 min
Aug 8, 1:37 PM EDTSpecial Marine WarningBOX53 min
Aug 8, 2:27 PM EDTSpecial Weather StatementBOXMiddlesex33 min
Aug 8, 3:25 PM EDTSpecial Weather StatementBOXEssex65 min
Aug 8, 3:38 PM EDTSpecial Marine WarningBOX67 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.