Alert archive / New Hampshire / Mesoscale Discussions in 2016

Mesoscale Discussion 1680

September 11, 20165 states

The Storm Prediction Center issued this mesoscale discussion at Sep 11, 2016, 7:44 AM EDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 11, 2016, 7:44 AM EDT (11:44 UTC)
Expired: Sep 11, 2016, 9:45 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 23 counties

Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA, Oxford 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, Columbia County, NY, Dutchess County, NY, Putnam County, NY, Bennington County, VT, Orange County, VT, Windham County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 161 km from the middle of the area, began a volume at 11:46 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 00:00Z, 11.7 hours before the alert went out and 154 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: 776 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1222 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 11, 10:01 AM EDT	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Hancock, Kennebec, Knox, Lincoln and 4 more	2 hr
Sep 10, 8:06 PM EDT	Mesoscale Discussion	SPC	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 2 more	84 min
Sep 11, 12:37 AM EDT	Mesoscale Discussion	SPC	Clinton, Essex, Franklin, Fulton, Hamilton, Herkimer and 8 more	113 min

Nearby

Mesoscale Discussions in New Hampshire, 2016 Mesoscale Discussions in Massachusetts, 2016 Mesoscale Discussions in Connecticut, 2016 Every mesoscale discussion in 2016

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.