Alert archive / Massachusetts / Tornado Warnings in 2021

Tornado Warning 20, NWS Boston/Norton, MA

November 13, 2021Dukes County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Nov 13, 2021, 5:47 PM EST for Dukes County, Massachusetts. It was in force for 28 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: Nov 13, 2021, 5:47 PM EST (22:47 UTC)
Expired: Nov 13, 2021, 6:15 PM EST
In force: 28 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Dukes County, MA

The radar

The Boston radar (KBOX), 72 km from the middle of the area, began a volume at 22:47 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, 10.8 hours before the alert went out and 190 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1435 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

992 
WFUS51 KBOX 132247
TORBOX
MAC007-132315-
/O.NEW.KBOX.TO.W.0020.211113T2247Z-211113T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
547 PM EST Sat Nov 13 2021

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Dukes County in southeastern Massachusetts...

* Until 615 PM EST.
    
* At 547 PM EST, a severe thunderstorm capable of producing a tornado
  was located over Aquinnah, moving northeast at 45 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...
  West Tisbury around 605 PM EST.
  Oak Bluffs and Tisbury around 610 PM EST.

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 4126 7083 4132 7077 4131 7079 4135 7084
      4135 7077 4143 7070 4145 7073 4145 7066
      4149 7072 4148 7075 4151 7071 4146 7066
      4148 7060 4145 7059 4147 7057 4141 7056
      4139 7051 4133 7074 4125 7080
TIME...MOT...LOC 2247Z 223DEG 38KT 4131 7083 

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

$$

Smith

1 follow-up statement

819 
WWUS51 KBOX 132309
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
609 PM EST Sat Nov 13 2021

MAC007-132319-
/O.EXP.KBOX.TO.W.0020.000000T0000Z-211113T2315Z/
Dukes MA-
609 PM EST Sat Nov 13 2021

...THE TORNADO WARNING FOR DUKES COUNTY WILL EXPIRE AT 615 PM EST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4126 7083 4132 7077 4131 7079 4135 7084
      4135 7077 4143 7070 4145 7073 4145 7066
      4149 7072 4148 7075 4151 7071 4146 7066
      4148 7060 4145 7059 4147 7057 4141 7056
      4139 7051 4133 7074 4125 7080
TIME...MOT...LOC 2309Z 223DEG 38KT 4148 7062 

$$

Smith

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 12, 9:39 PM EST	Gale Warning	BOX		29 hr
Nov 13, 4:09 PM EST	Severe Thunderstorm Warning	BOX	Hampden	15 min
Nov 13, 4:45 PM EST	Special Marine Warning	BOX		60 min
Nov 13, 5:01 PM EST	Severe Thunderstorm Warning	BOX	Worcester	26 min
Nov 13, 5:08 PM EST	Tornado Warning	BOX	Bristol	24 min
Nov 13, 5:12 PM EST	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	44 min
Nov 13, 5:17 PM EST	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Worcester	7 min
Nov 13, 5:21 PM EST	Tornado Warning	BOX	Bristol, Norfolk	24 min
Nov 13, 5:22 PM EST	Special Marine Warning	BOX		53 min
Nov 13, 5:26 PM EST	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester	32 min
Nov 13, 5:45 PM EST	Special Weather Statement	BOX	Bristol, Plymouth	45 min
Nov 13, 5:45 PM EST	Severe Thunderstorm Warning	BOX	Barnstable, Dukes, Plymouth	60 min
Nov 13, 5:55 PM EST	Severe Thunderstorm Warning	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	25 min
Nov 13, 6:02 PM EST	Special Marine Warning	BOX		58 min
Nov 13, 6:07 PM EST	Tornado Warning	BOX	Barnstable, Dukes	23 min
Nov 13, 6:13 PM EST	Special Marine Warning	BOX		92 min
Nov 13, 6:27 PM EST	Tornado Warning	BOX	Barnstable	15 min
Nov 13, 6:49 PM EST	Special Weather Statement	BOX	Barnstable	41 min

Nearby

Tornado Warnings in Massachusetts, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.