Alert archive / Massachusetts / Special Weather Statements in 2011

Special Weather Statement, NWS Boston/Norton, MA

April 28, 2011Franklin County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Apr 28, 2011, 9:10 AM EDT for Franklin County, Massachusetts. It was in force for 50 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: Apr 28, 2011, 9:10 AM EDT (13:10 UTC)
Expired: Apr 28, 2011, 10:00 AM EDT
In force: 50 min
Issued by: NWS Boston/Norton, MA

County Franklin County, MA

The radar

The Albany radar (KENX), 92 km from the middle of the area, began a volume at 13:13 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, 1.2 hours before the alert went out and 72 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: 354 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 258 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Apr 27, 7:34 PM EDT, 13 hours 36 minutes earlier.

Area forecast discussion, Apr 27, 7:34 PM EDT, 13 hours 36 minutes before

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Hazardous weather outlook, Apr 27, 4:07 PM EDT, 17 hours 3 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
Apr 28, 4:38 AM EDT	Wind Advisory	BOX	Barnstable, Bristol, Dukes, Nantucket, Norfolk, Plymouth and 1 more	13 hr
Apr 28, 11:42 AM EDT	Dense Fog Advisory	BOX	Dukes, Nantucket	12 hr
Apr 28, 4:46 PM EDT	Special Weather Statement	BOX	Bristol, Plymouth	59 min
Apr 28, 4:58 PM EDT	Special Weather Statement	BOX	Norfolk	47 min
Apr 28, 7:58 PM EDT	Areal Flood Advisory	BOX	Barnstable, Bristol, Plymouth	3 hr
Apr 28, 12:34 PM EDT	River Flood Warning	BOX	Capitol Planning Region, Lower Connecticut River Valley Planning Region	5 days
Apr 28, 12:34 PM EDT	River Flood Warning	BOX	Capitol Planning Region, Lower Connecticut River Valley Planning Region	6 days

Nearby

Special Weather Statements in Massachusetts, 2011 Every special weather statement in 2011

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.