Alert archive / Pennsylvania / Mesoscale Discussions in 2014

Mesoscale Discussion 1356

July 13, 20144 counties in New York; 40 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2014, 3:10 PM EDT for 4 counties in New York; 40 counties in Pennsylvania. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 13, 2014, 3:10 PM EDT (19:10 UTC)
Expired: Jul 13, 2014, 5:15 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 44 counties

Broome County, NY, Chemung County, NY, Steuben County, NY, Tioga County, NY, Bedford County, PA, Berks County, PA, Blair County, PA, Bradford County, PA, Cambria County, PA, Cameron County, PA, Carbon County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Elk County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lackawanna County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Lycoming County, PA, McKean County, PA, Mifflin County, PA, Monroe County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry 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 State College radar (KCCX), 73 km from the middle of the area, began a volume at 19:10 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.2 hours before the alert went out and 216 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: 45 J/kg
Mixed-layer CIN: -175 J/kg
Mixed-layer LCL: 1047 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 218 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 13, 4:06 PM EDT	Severe Thunderstorm Watch	SPC	Broome, Chemung, Delaware, Steuben, Sullivan, Tioga	6 hr
Jul 13, 5:49 PM EDT	Mesoscale Discussion	SPC	Broome, Columbia, Delaware, Dutchess, Greene, Orange and 6 more	86 min
Jul 13, 6:25 PM EDT	Severe Thunderstorm Watch	SPC	Columbia, Dutchess, Orange, Putnam, Ulster	4 hr
Jul 13, 12:37 PM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more	53 min
Jul 13, 1:17 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more	7 hr
Jul 13, 6:18 PM EDT	Mesoscale Discussion	SPC	Allegheny, Fayette, Greene, Washington, Westmoreland	87 min
Jul 13, 7:06 PM EDT	Mesoscale Discussion	SPC	Berks, Bucks, Carbon, Chester, Columbia, Cumberland and 20 more	84 min
Jul 13, 7:49 PM EDT	Severe Thunderstorm Watch	SPC	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	4 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2014 Mesoscale Discussions in New York, 2014 Every mesoscale discussion in 2014

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.