Alert archive / Connecticut / Mesoscale Discussions in 2013

Mesoscale Discussion 1113

June 17, 20137 counties in Massachusetts; 5 counties in Rhode Island

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2013, 6:56 PM EDT for 7 counties in Massachusetts; 5 counties in Rhode Island. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2013, 6:56 PM EDT (22:56 UTC)
Expired: Jun 17, 2013, 8:00 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Barnstable County, MA, Bristol County, MA, Dukes County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 69 km from the middle of the area, began a volume at 22:56 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

Brookhaven, NY (KOKX), launched 12:00Z, 10.9 hours before the alert went out and 119 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: 137 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 1104 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 1:14 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region and 1 more	6 hr
Jun 17, 4:09 PM EDT	Mesoscale Discussion	SPC		96 min
Jun 17, 12:07 PM EDT	Mesoscale Discussion	SPC	Berkshire, Franklin, Hampshire	83 min

Nearby

Mesoscale Discussions in Connecticut, 2013 Mesoscale Discussions in Massachusetts, 2013 Mesoscale Discussions in Rhode Island, 2013 Every mesoscale discussion in 2013

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.