Alert archive / Massachusetts / Special Weather Statements in 2021

Special Weather Statement, NWS Boston/Norton, MA

September 9, 2021Barnstable County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Sep 9, 2021, 3:13 PM EDT for Barnstable 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: Sep 9, 2021, 3:13 PM EDT (19:13 UTC)
Expired: Sep 9, 2021, 4:00 PM EDT
In force: 47 min
Issued by: NWS Boston/Norton, MA
Hail: 0.25 in
Wind: 40
Spout: Possible

County Barnstable County, MA

The radar

The Boston radar (KBOX), 90 km from the middle of the area, began a volume at 19:18 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.

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 7.2 hours before the alert went out and 216 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: 143 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 636 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

468 
WWUS81 KBOX 091913
SPSBOX

Special Weather Statement
National Weather Service Boston/Norton MA
313 PM EDT Thu Sep 9 2021
 
MAZ022-092000-
Barnstable MA-
313 PM EDT Thu Sep 9 2021

...A thunderstorm capable of producing a waterspout will impact 
portions of northeastern Barnstable County through 400 PM EDT...

At 312 PM EDT, Doppler radar was tracking a thunderstorm capable of 
producing a waterspout over Cape Cod Bay, near Wellfleet, or 10 
miles southeast of Provincetown, moving northeast at 30 mph.

HAZARD...Waterspouts, winds in excess of 40 mph, and pea size hail.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous waters. Gusty winds could knock down tree limbs 
         and blow around unsecured objects. Minor damage to outdoor 
         objects is possible.

Locations impacted include...
Wellfleet and Truro. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4193 7003 4193 7006 4192 7005 4190 7007
      4191 7007 4201 7008 4204 7006 4200 7002
      4196 6999
TIME...MOT...LOC 1912Z 219DEG 27KT 4191 7010 

WATERSPOUT...POSSIBLE
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

$$
Gaucher

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 8, 8:42 PM EDT	Special Weather Statement	BOX	Franklin	48 min
Sep 8, 9:40 PM EDT	Small Craft Advisory	BOX		5 hr
Sep 9, 2:57 AM EDT	Rip Current Statement	BOX	Barnstable, Dukes, Essex, Nantucket, Norfolk, Plymouth	11 hr
Sep 9, 8:43 AM EDT	Special Marine Warning	BOX		62 min
Sep 9, 8:50 AM EDT	Special Weather Statement	BOX	Nantucket	55 min
Sep 9, 11:06 AM EDT	Special Marine Warning	BOX		54 min
Sep 9, 1:55 PM EDT	High Surf Advisory	BOX	Barnstable, Dukes, Essex, Nantucket, Norfolk, Plymouth	53 hr
Sep 9, 1:57 PM EDT	Special Weather Statement	BOX	Dukes, Plymouth	63 min
Sep 9, 2:53 PM EDT	Special Weather Statement	BOX	Barnstable, Nantucket	82 min
Sep 9, 3:11 PM EDT	Special Marine Warning	BOX		34 min
Sep 9, 3:46 PM EDT	Special Marine Warning	BOX		29 min
Sep 9, 7:30 PM EDT	Areal Flood Warning	BOX	Barnstable	3 hr
Sep 9, 5:04 AM EDT	Special Weather Statement	BOX	Providence	41 min
Sep 9, 3:33 AM EDT	Special Weather Statement	BOX		42 min
Sep 9, 3:50 AM EDT	Tornado Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	25 min
Sep 9, 4:13 AM EDT	Tornado Warning	BOX	Northeastern Connecticut Planning Region	11 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.