Alert archive / New York / Mesoscale Discussions in 2007

Mesoscale Discussion 1479

July 15, 20078 states

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2007, 10:40 AM EDT for 8 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 15, 2007, 10:40 AM EDT (14:40 UTC)
Expired: Jul 15, 2007, 12:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 52 counties

Berkshire County, MA, Bristol County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Androscoggin County, ME, Cumberland County, ME, Kennebec County, ME, Lincoln County, ME, Oxford County, ME, Sagadahoc County, ME, Waldo 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, Sullivan County, NH, Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Bronx County, NY, Columbia County, NY, Dutchess County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Ulster County, NY, Westchester County, NY, Pike County, PA, Bristol County, RI, Kent County, RI, Providence County, RI, Windham County, VT

The radar

The Boston radar (KBOX), 84 km from the middle of the area, began a volume at 14:40 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 2.7 hours before the alert went out and 158 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: 215 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1182 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 170 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, 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, 4:17 PM EDT	Mesoscale Discussion	SPC		118 min
Jul 15, 11:17 AM EDT	Mesoscale Discussion	SPC	Broome, Chemung, Chenango, Cortland, Delaware, Fulton and 12 more	58 min
Jul 15, 1:21 PM EDT	Mesoscale Discussion	SPC	Allegheny, Bedford, Blair, Cambria, Centre, Clearfield and 16 more	84 min

Nearby

Mesoscale Discussions in New York, 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.