Alert archive / Massachusetts / Tornado Warnings in 2023

Tornado Warning 8, NWS Boston/Norton, MA

August 8, 2023Middlesex County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Aug 8, 2023, 8:58 AM EDT for Middlesex County, Worcester County, Massachusetts. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 8, 2023, 8:58 AM EDT (12:58 UTC)
Expired
Aug 8, 2023, 9:30 AM EDT
In force
32 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Middlesex County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 50 km from the middle of the area, began a volume at 13:02 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 1.0 hours before the alert went out and 179 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.

039 
WFUS51 KBOX 081258
TORBOX
MAC017-027-081330-
/O.NEW.KBOX.TO.W.0008.230808T1258Z-230808T1330Z/

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

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Southeastern Worcester County in central Massachusetts...
  South central Middlesex County in northeastern Massachusetts...

* Until 930 AM EDT.
    
* At 858 AM EDT, a severe thunderstorm capable of producing a 
  tornado was located near Sutton, or 11 miles south of Worcester, 
  moving northeast at 25 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...
  Worcester, Shrewsbury, Westborough, Grafton, Auburn, Northbridge, 
  Oxford, Millbury, Sutton, and Upton around 905 AM EDT.
  Hopkinton around 910 AM EDT.
  Milford around 915 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.

&&

LAT...LON 4223 7143 4205 7180 4209 7189 4239 7171
TIME...MOT...LOC 1257Z 217DEG 21KT 4210 7180 

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

$$

BL
2 follow-up statements
083 
WWUS51 KBOX 081310
SVSBOX

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

MAC017-027-081330-
/O.CON.KBOX.TO.W.0008.000000T0000Z-230808T1330Z/
Worcester MA-Middlesex MA-
910 AM EDT Tue Aug 8 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 AM EDT FOR
SOUTHEASTERN WORCESTER AND SOUTH CENTRAL MIDDLESEX COUNTIES...
    
At 910 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Sutton, or 8 miles south of Shrewsbury, moving
northeast at 25 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...
  Worcester, Shrewsbury, Milford, Westborough, Grafton, Northbridge, 
  Hopkinton, Northborough, Millbury, and Sutton around 915 AM EDT.
  Ashland and Southborough around 920 AM EDT.
  Marlborough and Boylston around 925 AM EDT.
  Holliston around 930 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 4223 7143 4210 7173 4215 7180 4239 7171
TIME...MOT...LOC 1310Z 226DEG 21KT 4215 7173 

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

$$

BL
347 
WWUS51 KBOX 081322
SVSBOX

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

MAC017-027-081332-
/O.EXP.KBOX.TO.W.0008.000000T0000Z-230808T1330Z/
Worcester MA-Middlesex MA-
922 AM EDT Tue Aug 8 2023

...THE TORNADO WARNING FOR SOUTHEASTERN WORCESTER AND SOUTH CENTRAL
MIDDLESEX COUNTIES WILL EXPIRE AT 930 AM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

LAT...LON 4223 7143 4210 7173 4215 7180 4239 7171
TIME...MOT...LOC 1322Z 217DEG 21KT 4221 7167 

$$

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, 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, 11:18 AM EDTTornado WarningBOXBarnstable, Bristol, Plymouth27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.