Alert archive / Massachusetts / Special Weather Statements in 2021

Special Weather Statement, NWS Boston/Norton, MA

October 31, 2021Dukes County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Oct 31, 2021, 2:13 AM EDT for Dukes County, Massachusetts. It was in force for 47 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: Oct 31, 2021, 2:13 AM EDT (06:13 UTC)
Expired: Oct 31, 2021, 3:00 AM EDT
In force: 47 min
Issued by: NWS Boston/Norton, MA
Hail: 0.00 in
Wind: 40

County Dukes County, MA

The radar

The Boston radar (KBOX), 74 km from the middle of the area, began a volume at 06:12 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 00:00Z, 6.2 hours before the alert went out and 211 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: 854 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

487 
WWUS81 KBOX 310613
SPSBOX

Special Weather Statement
National Weather Service Boston/Norton MA
213 AM EDT Sun Oct 31 2021
 
MAZ022>024-310700-
Nantucket MA-Dukes MA-Barnstable MA-
213 AM EDT Sun Oct 31 2021

...A strong thunderstorm will impact portions of northeastern Dukes
and southwestern Barnstable Counties through 300 AM EDT...

At 212 AM EDT, Doppler radar was tracking a strong thunderstorm 17
miles south of Edgartown, moving north at 55 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Strong winds could cause minor damage such as downed 
         branches.

Locations impacted include...
Barnstable, Falmouth, Oak Bluffs, Edgartown, Tisbury, Yarmouth,
Mashpee, West Tisbury, Chilmark, Gosnold and Hyannis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when you hear thunder. Do not resume outdoor activities
until at least 30 minutes after the storm has passed.

This storm may intensify and become severe. Stay tuned to your local
media for updates and possible warnings.

&&

LAT...LON 4155 7048 4141 7045 4155 7051 4135 7045
      4144 7050 4135 7050 4135 7067 4153 7068
      4149 7073 4150 7073 4163 7065 4168 7023
      4161 7026 4163 7027 4162 7043 4154 7047
      4131 7028
TIME...MOT...LOC 0612Z 178DEG 46KT 4113 7041 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

Chai

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 31, 2:01 AM EDT	Special Marine Warning	BOX		59 min
Oct 31, 2:26 AM EDT	Severe Thunderstorm Warning	BOX	Barnstable, Dukes, Plymouth	31 min
Oct 31, 3:11 AM EDT	Special Weather Statement	BOX	Plymouth	64 min
Oct 31, 3:21 AM EDT	Areal Flood Warning	BOX	Bristol, Plymouth	96 min
Oct 31, 3:34 AM EDT	Special Marine Warning	BOX		56 min

Nearby

Special Weather Statements in Massachusetts, 2021 Every special weather statement 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.