Alert archive / New Hampshire / Mesoscale Discussions in 2007

Mesoscale Discussion 1430

July 9, 2007York County, Maine; 6 counties in New Hampshire

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2007, 2:20 PM EDT for York County, Maine; 6 counties in New Hampshire. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jul 9, 2007, 2:20 PM EDT (18:20 UTC)
Expired: Jul 9, 2007, 3:45 PM EDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties York County, ME, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH

The radar

The Portland,ME radar (KGYX), 111 km from the middle of the area, began a volume at 18:21 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 501Jul 9, 5:50 PM EDT

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 6.3 hours before the alert went out and 111 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: 798 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 177 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 9, 5:48 PM EDT	Severe Thunderstorm Watch	SPC	York	6 hr
Jul 9, 10:56 AM EDT	Mesoscale Discussion	SPC	Coos, Grafton, Sullivan	64 min
Jul 9, 11:18 AM EDT	Severe Thunderstorm Watch	SPC	Belknap, Carroll, Coos, Grafton, Merrimack, Sullivan	6 hr
Jul 9, 4:03 PM EDT	Mesoscale Discussion	SPC	Belknap, Carroll, Coos, Grafton, Hillsborough, Merrimack and 1 more	117 min

Nearby

Mesoscale Discussions in New Hampshire, 2007 Mesoscale Discussions in Maine, 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.