Alert archive / Massachusetts / Tornado Warnings in 2018

Tornado Warning 13, NWS Boston/Norton, MA

October 23, 2018Bristol County, Norfolk County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Oct 23, 2018, 3:59 PM EDT for Bristol County, Norfolk County, Plymouth County, Massachusetts. It was in force for 31 min. 2 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
Oct 23, 2018, 3:59 PM EDT (19:59 UTC)
Expired
Oct 23, 2018, 4:30 PM EDT
In force
31 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Bristol County, MA, Norfolk County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 4 km from the middle of the area, began a volume at 20:00 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
Oct 23, 4:13 PM EDTTORNADONorton, MAAN EF-1 TORNADO HIT A SMALL PORTION OF NORTON FROM 413-415 PM EDT. MAXIMUM WINDS WERE ESTIMATED AT 90-95 MPH. THE TORNADO BEGAN ON FREEMAN ST., JUST NORTH OF RTE 123. IT MOVED NORTHEAST, CUTTING ACROSS THE SOUTHERN PORTION OF NORTON RESERVOIR, ACROSS RTE 140,
Oct 23, 4:32 PM EDTTSTM WND DMGNorton, MATREES AND WIRES DOWN ON MANSFIELD AVE.

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, 8.0 hours before the alert went out and 105 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, Chatham, MA at 12:00Z on 2018-10-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 12:00Z on 2018-10-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1269 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

820 
WFUS51 KBOX 231959
TORBOX
MAC005-021-023-232030-
/O.NEW.KBOX.TO.W.0013.181023T1959Z-181023T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
359 PM EDT TUE OCT 23 2018

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  South central Norfolk County in eastern Massachusetts...
  Northwestern Bristol County in southeastern Massachusetts...
  West central Plymouth County in southeastern Massachusetts...

* Until 430 PM EDT.
    
* At 359 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Attleboro, or near North Attleborough, 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...
  Mansfield around 415 PM EDT.
  Norton around 420 PM EDT.
  Taunton, Easton and Raynham around 425 PM EDT.
  Brockton, Bridgewater, Middleborough and West Bridgewater around 
  430 PM 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 4188 7127 4195 7133 4212 7109 4191 7093
TIME...MOT...LOC 1959Z 244DEG 22KT 4193 7125 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Sipprell

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 23, 2:04 PM EDTSmall Craft AdvisoryBOX61 hr
Oct 23, 2:46 PM EDTSpecial Weather StatementBOXBristol44 min
Oct 23, 2:53 PM EDTSpecial Marine WarningBOX52 min
Oct 23, 3:01 PM EDTSpecial Weather StatementBOXPlymouth29 min
Oct 23, 3:18 PM EDTSpecial Weather StatementBOXBarnstable27 min
Oct 23, 3:20 PM EDTSpecial Weather StatementBOXHampden25 min
Oct 23, 3:23 PM EDTSpecial Weather StatementBOXFranklin, Hampshire52 min
Oct 23, 3:32 PM EDTSevere Thunderstorm WarningBOXBristol, Norfolk28 min
Oct 23, 3:34 PM EDTTornado WarningBOXBristol, Norfolk26 min
Oct 23, 3:46 PM EDTSevere Thunderstorm WarningBOXBristol, Norfolk, Plymouth29 min
Oct 23, 3:53 PM EDTSpecial Weather StatementBOXWorcester52 min
Oct 23, 3:57 PM EDTSpecial Weather StatementBOXWorcester33 min
Oct 23, 4:23 PM EDTSpecial Weather StatementBOXWorcester52 min
Oct 23, 4:24 PM EDTSevere Thunderstorm WarningBOXBristol, Norfolk, Plymouth23 min
Oct 23, 4:27 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester33 min
Oct 23, 4:45 PM EDTSpecial Weather StatementBOXWorcester30 min
Oct 23, 4:47 PM EDTSpecial Weather StatementBOXBarnstable43 min
Oct 23, 4:49 PM EDTSpecial Weather StatementBOXBarnstable26 min
Oct 23, 5:04 PM EDTSpecial Weather StatementBOXBristol26 min
Oct 23, 5:15 PM EDTSpecial Weather StatementBOXMiddlesex45 min
Oct 23, 5:28 PM EDTSpecial Marine WarningBOX32 min
Oct 23, 5:30 PM EDTSevere Thunderstorm WarningBOXBarnstable, Plymouth30 min
Oct 23, 5:42 PM EDTSpecial Marine WarningBOX48 min
Oct 23, 5:44 PM EDTSpecial Marine WarningBOX46 min
Oct 23, 5:46 PM EDTSpecial Weather StatementBOXMiddlesex29 min
Oct 23, 5:51 PM EDTSpecial Marine WarningBOX39 min
Oct 23, 6:22 PM EDTSpecial Marine WarningBOX38 min
Oct 23, 6:28 PM EDTSpecial Weather StatementBOXNorfolk, Suffolk47 min
Oct 23, 6:44 PM EDTSevere Thunderstorm WarningBOXBarnstable31 min
Oct 23, 6:53 PM EDTSpecial Marine WarningBOX22 min
Oct 23, 7:14 PM EDTSpecial Marine WarningBOX61 min
Oct 23, 7:15 PM EDTSpecial Marine WarningBOX30 min

Nearby

Tornado Warnings in Massachusetts, 2018Every tornado warning in 2018Tornadoes in 2018

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.