Alert archive / Pennsylvania / Mesoscale Discussions in 2014

Mesoscale Discussion 5

January 5, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jan 5, 2014, 12:07 PM EST for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jan 5, 2014, 12:07 PM EST (17:07 UTC)
Expired: Jan 5, 2014, 6:00 PM EST
In force: 6 hr
Issued by: the Storm Prediction Center

All 41 counties

Allegany County, MD, Carroll County, MD, Frederick County, MD, Washington County, MD, Warren County, NJ, Adams County, PA, Bedford County, PA, Berks County, PA, Blair County, PA, Carbon County, PA, Centre County, PA, Chester County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton 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, Pike County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Union County, PA, Wyoming County, PA, York County, PA, Berkeley County, WV, Morgan County, WV

The radar

The State College radar (KCCX), 121 km from the middle of the area, began a volume at 17:04 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

Pittsburgh, PA (KAGC), launched 12:00Z, 5.1 hours before the alert went out and 284 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: 1546 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 226 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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Nearby

Mesoscale Discussions in Pennsylvania, 2014 Mesoscale Discussions in Maryland, 2014 Mesoscale Discussions in West Virginia, 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.