Alert archive / Massachusetts / Mesoscale Discussions in 2015

Mesoscale Discussion 1144

June 23, 20155 states

The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2015, 6:55 PM EDT for 5 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jun 23, 2015, 6:55 PM EDT (22:55 UTC)
Expired: Jun 23, 2015, 8:30 PM EDT
In force: 95 min
Issued by: the Storm Prediction Center

All 32 counties

Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Androscoggin County, ME, Cumberland County, ME, Oxford County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI, Windham County, VT

The radar

The Boston radar (KBOX), 88 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

Albany, NY (KALY), launched 12:00Z, 10.9 hours before the alert went out and 176 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: 56 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 1348 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 396 m²/s²
0-3 km storm-relative helicity: 462 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 23, 8:57 AM EDT	Mesoscale Discussion	SPC		63 min
Jun 23, 10:12 AM 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 23, 2:46 PM EDT	Mesoscale Discussion	SPC		89 min
Jun 23, 3:35 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	6 hr
Jun 23, 3:47 PM EDT	Tornado Watch	SPC	Capitol Planning Region, Northeastern Connecticut Planning Region	7 hr
Jun 23, 4:53 PM EDT	Mesoscale Discussion	SPC		97 min

Nearby

Mesoscale Discussions in Massachusetts, 2015 Mesoscale Discussions in New Hampshire, 2015 Mesoscale Discussions in Rhode Island, 2015 Every mesoscale discussion in 2015

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.