Alert archive / Massachusetts / Mesoscale Discussions in 2008

Mesoscale Discussion 1995

August 2, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2008, 12:32 PM EDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Aug 2, 2008, 12:32 PM EDT (16:32 UTC)
Expired: Aug 2, 2008, 2:00 PM EDT
In force: 88 min
Issued by: the Storm Prediction Center

All 24 counties

Bristol County, MA, Dukes 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, Cheshire County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI, Caledonia County, VT, Orange County, VT, Windham County, VT, Windsor County, VT

The radar

The Boston radar (KBOX), 76 km from the middle of the area, began a volume at 16:33 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

Chatham, MA (KCHH), launched 12:00Z, 4.5 hours before the alert went out and 164 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: 59 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1196 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Aug 2, 10:11 AM EDT	Mesoscale Discussion	SPC		94 min
Aug 2, 10:39 AM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	9 hr

Nearby

Mesoscale Discussions in Massachusetts, 2008 Mesoscale Discussions in New Hampshire, 2008 Mesoscale Discussions in Rhode Island, 2008 Every mesoscale discussion in 2008

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.