Alert archive / New Hampshire / Mesoscale Discussions in 2007

Mesoscale Discussion 1483

July 15, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2007, 4:17 PM EDT for 4 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jul 15, 2007, 4:17 PM EDT (20:17 UTC)
Expired: Jul 15, 2007, 6:15 PM EDT
In force: 118 min
Issued by: the Storm Prediction Center

Counties Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA, Cumberland County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Dutchess County, NY, Orange County, NY, Putnam County, NY

The radar

The Boston radar (KBOX), 99 km from the middle of the area, began a volume at 20:17 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, 8.3 hours before the alert went out and 173 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1159 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 244 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
Jul 15, 10:40 AM EDT	Mesoscale Discussion	SPC		2 hr
Jul 15, 12:01 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Northeastern Connecticut Planning Region	7 hr
Jul 15, 12:40 PM EDT	Severe Thunderstorm Watch	SPC	Northwest Hills Planning Region	4 hr
Jul 15, 11:17 AM EDT	Mesoscale Discussion	SPC	Broome, Chemung, Chenango, Cortland, Delaware, Fulton and 12 more	58 min

Nearby

Mesoscale Discussions in New Hampshire, 2007 Mesoscale Discussions in Massachusetts, 2007 Mesoscale Discussions in Connecticut, 2007 Every mesoscale discussion in 2007

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.