Alert archive / New York / Mesoscale Discussions in 2007

Mesoscale Discussion 1397

July 5, 20076 states

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2007, 4:12 PM EDT for 6 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 5, 2007, 4:12 PM EDT (20:12 UTC)
Expired: Jul 5, 2007, 6:15 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 28 counties

Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Worcester County, MA, York County, ME, Belknap County, NH, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Albany County, NY, Columbia County, NY, Dutchess County, NY, Greene County, NY, Montgomery County, NY, Orange County, NY, Putnam County, NY, Rensselaer County, NY, Schenectady County, NY, Ulster County, NY, Providence County, RI, Bennington County, VT, Windham County, VT

The radar

The Albany radar (KENX), 112 km from the middle of the area, began a volume at 20:14 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 12:00Z, 8.2 hours before the alert went out and 97 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: 117 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 460 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 31 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
Jul 5, 3:10 PM EDT	Mesoscale Discussion	SPC		65 min
Jul 5, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Northwest Hills Planning Region, Naugatuck Valley Planning Region, Northeastern Connecticut Planning Region	5 hr
Jul 5, 12:17 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cattaraugus, Chemung, Chenango, Cortland and 8 more	118 min
Jul 5, 1:00 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chemung, Chenango and 13 more	7 hr

Nearby

Mesoscale Discussions in New York, 2007 Mesoscale Discussions in Massachusetts, 2007 Mesoscale Discussions in New Hampshire, 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.