Alert archive / Massachusetts / Special Weather Statements in 2017

Special Weather Statement, NWS Boston/Norton, MA

August 12, 2017Franklin County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Aug 12, 2017, 7:47 PM EDT for Franklin County, Massachusetts. It was in force for 88 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: Aug 12, 2017, 7:47 PM EDT (23:47 UTC)
Expired: Aug 12, 2017, 9:15 PM EDT
In force: 88 min
Issued by: NWS Boston/Norton, MA

County Franklin County, MA

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 11.8 hours before the alert went out and 80 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: 609 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 145 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 Aug 12, 7:05 PM EDT, 42 minutes earlier.

Area forecast discussion, Aug 12, 7:05 PM EDT, 42 minutes before

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Hazardous weather outlook, Aug 12, 4:21 PM EDT, 3 hours 26 minutes before

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In the hours before

Special weather statement, Aug 12, 7:47 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 4:00 AM EDT	Small Craft Advisory	BOX		46 hr
Aug 12, 3:59 PM EDT	Small Craft Advisory	BOX		27 hr

Nearby

Special Weather Statements in Massachusetts, 2017 Every special weather statement in 2017

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.