Alert archive / New Hampshire / Mesoscale Discussions in 2011

Mesoscale Discussion 1835

August 2, 2011York County, Maine; 4 counties in Massachusetts; 7 counties in New Hampshire

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2011, 2:33 PM EDT for York County, Maine; 4 counties in Massachusetts; 7 counties in New Hampshire. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Aug 2, 2011, 2:33 PM EDT (18:33 UTC)
Expired: Aug 2, 2011, 3:30 PM EDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Essex County, MA, Middlesex County, MA, Suffolk County, MA, Worcester County, MA, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH

The radar

The Boston radar (KBOX), 117 km from the middle of the area, began a volume at 18:32 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

Gray, ME (KGYX), launched 12:00Z, 6.6 hours before the alert went out and 129 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: 465 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: -27 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.6

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, 10:42 AM EDT	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox and 9 more	63 min
Aug 2, 11:31 AM EDT	Severe Thunderstorm Watch	SPC	Androscoggin, Cumberland, Kennebec, Knox, Lincoln, Sagadahoc and 2 more	7 hr

Nearby

Mesoscale Discussions in New Hampshire, 2011 Mesoscale Discussions in Massachusetts, 2011 Mesoscale Discussions in Maine, 2011 Every mesoscale discussion 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.