Alert archive / Massachusetts / Special Weather Statements in 2018

Special Weather Statement, NWS Boston/Norton, MA

May 4, 2018Franklin County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at May 4, 2018, 5:45 PM EDT for Franklin County, Massachusetts. It was in force for 30 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: May 4, 2018, 5:45 PM EDT (21:45 UTC)
Expired: May 4, 2018, 6:15 PM EDT
In force: 30 min
Issued by: NWS Boston/Norton, MA

County Franklin County, MA

The radar

The Albany radar (KENX), 96 km from the middle of the area, began a volume at 21:46 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, 9.8 hours before the alert went out and 78 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: 812 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boston/Norton, MA wrote its last area forecast discussion before this special weather statement went out at May 4, 3:28 PM EDT, 2 hours 17 minutes earlier.

Area forecast discussion, May 4, 3:28 PM EDT, 2 hours 17 minutes before

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Hazardous weather outlook, May 4, 3:30 PM EDT, 2 hours 15 minutes before

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In the hours before

Special weather statement, May 4, 5:45 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Boston/Norton MA
545 PM EDT FRI MAY 4 2018

MAZ002-003-008-042215-
Western Franklin MA-Western Hampshire MA-Eastern Franklin MA-
545 PM EDT FRI MAY 4 2018

...STRONG THUNDERSTORM...

At 544 PM EDT, Doppler radar was tracking a strong thunderstorm near
Cheshire, moving northeast at 60 mph.

Nickel size hail and wind gusts up to 50 mph will accompany this
storm.

Locations impacted include...
Northfield, Bernardston, Buckland, Shelburne, Ashfield, Colrain,
Charlemont, Leyden, Heath, Plainfield, Rowe and Hawley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.

&&

LAT...LON 4252 7297 4256 7298 4263 7295 4267 7296
      4273 7285 4272 7245 4249 7298
TIME...MOT...LOC 2144Z 238DEG 54KT 4252 7309

EVT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 9:46 PM EDT	Small Craft Advisory	BOX		51 hr
May 4, 3:38 AM EDT	Wind Advisory	BOX	Essex, Franklin, Hampden, Hampshire, Middlesex, Norfolk and 2 more	27 hr
May 4, 3:24 PM EDT	Gale Warning	BOX		15 hr
May 4, 5:54 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	18 min

Nearby

Special Weather Statements in Massachusetts, 2018 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.