Alert archive / Pennsylvania / Mesoscale Discussions in 2012

Mesoscale Discussion 1424

July 7, 201213 counties in New Jersey; 16 counties in New York; 38 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2012, 11:19 AM EDT for 13 counties in New Jersey; 16 counties in New York; 38 counties in Pennsylvania. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jul 7, 2012, 11:19 AM EDT (15:19 UTC)
Expired: Jul 7, 2012, 12:45 PM EDT
In force: 86 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 67 counties

Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Broome County, NY, Delaware County, NY, Dutchess County, NY, Greene 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, Sullivan County, NY, Ulster County, NY, Westchester County, NY, Berks County, PA, Bradford County, PA, Bucks County, PA, Cameron County, PA, Carbon County, PA, Centre County, PA, Chester County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Dauphin County, PA, Delaware County, PA, Huntingdon County, PA, Juniata County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Lycoming County, PA, Mifflin County, PA, Monroe County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Pike County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA

The radar

The Binghamton radar (KBGM), 102 km from the middle of the area, began a volume at 15:21 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 3.3 hours before the alert went out and 225 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: 1653 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 171 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 7, 11:41 AM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Northwest Hills Planning Region, Naugatuck Valley Planning Region	7 hr
Jul 7, 1:36 PM EDT	Mesoscale Discussion	SPC		84 min
Jul 7, 3:57 PM EDT	Mesoscale Discussion	SPC		2 hr
Jul 7, 5:43 PM EDT	Mesoscale Discussion	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 14 more	62 min
Jul 7, 6:14 PM EDT	Severe Thunderstorm Watch	SPC	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 9 more	3 hr
Jul 7, 1:48 PM EDT	Mesoscale Discussion	SPC	Cattaraugus	57 min
Jul 7, 2:16 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 21 more	5 hr
Jul 7, 6:59 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Beaver, Fayette, Greene, Washington, Westmoreland	3 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2012 Mesoscale Discussions in New York, 2012 Mesoscale Discussions in New Jersey, 2012 Every mesoscale discussion in 2012

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.