Alert archive / Massachusetts / Special Weather Statements in 2021

Special Weather Statement, NWS Boston/Norton, MA

October 16, 2021Franklin County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Oct 16, 2021, 6:48 PM EDT for Franklin County, Massachusetts. It was in force for 42 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 16, 2021, 6:48 PM EDT (22:48 UTC)
Expired: Oct 16, 2021, 7:30 PM EDT
In force: 42 min
Issued by: NWS Boston/Norton, MA
Hail: 0.00 in
Wind: 40

County Franklin County, MA

The radar

The Albany radar (KENX), 108 km from the middle of the area, began a volume at 22:52 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

Albany, NY (KALY), launched 12:00Z, 10.8 hours before the alert went out and 91 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: 50 J/kg
Mixed-layer CIN: -197 J/kg
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

690 
WWUS81 KBOX 162248
SPSBOX

Special Weather Statement
National Weather Service Boston/Norton MA
648 PM EDT Sat Oct 16 2021
 
MAZ002-003-008>010-162330-
Western Franklin MA-Western Hampshire MA-Western Hampden MA-
Eastern Franklin MA-Eastern Hampshire MA-
648 PM EDT Sat Oct 16 2021

...A strong thunderstorm will impact portions of western Hampshire,
central Franklin and northwestern Hampden Counties through 730 PM
EDT...

At 647 PM EDT, Doppler radar was tracking a strong thunderstorm near
Huntington, or 11 miles west of Northampton, moving northeast at 50
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...
Northampton, Greenfield, Orange, Deerfield, Montague, Sunderland,
Hatfield, Northfield, Williamsburg, Huntington, Bernardston,
Buckland, Conway, Shelburne, Leverett, Erving, Ashfield, Colrain,
Westhampton and Gill.

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 4273 7259 4273 7241 4262 7223 4225 7289
      4227 7300 4231 7300 4231 7303 4233 7306
TIME...MOT...LOC 2247Z 229DEG 45KT 4233 7290 

MAX HAIL SIZE...0.00 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
Oct 16, 5:53 PM EDT	Special Weather Statement	BOX	Hampshire	37 min
Oct 16, 6:00 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	27 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.