Alert archive / Pennsylvania / Mesoscale Discussions in 2008

Mesoscale Discussion 2067

August 10, 20085 states

The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2008, 4:06 PM EDT for 5 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Aug 10, 2008, 4:06 PM EDT (20:06 UTC)
Expired: Aug 10, 2008, 5:30 PM EDT
In force: 84 min
Issued by: the Storm Prediction Center

All 54 counties

Carroll County, MD, Frederick County, MD, Montgomery County, MD, Washington County, MD, Broome County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Lewis County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Otsego County, NY, Schoharie County, NY, Sullivan County, NY, Tioga County, NY, Adams County, PA, Berks County, PA, Bradford County, PA, Carbon County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Juniata County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Pike County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA, York County, PA, City of Winchester, VA, Clarke County, VA, Fauquier County, VA, Loudoun County, VA, Rappahannock County, VA, Warren County, VA, Berkeley County, WV, Jefferson County, WV

The radar

The State College radar (KCCX), 128 km from the middle of the area, began a volume at 20:06 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.1 hours before the alert went out and 247 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: 771 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 923 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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
Aug 10, 10:27 AM EDT	Mesoscale Discussion	SPC	Caroline, Cecil, Kent, Queen Anne's, Talbot	33 min
Aug 10, 10:46 AM EDT	Severe Thunderstorm Watch	SPC	Caroline, Cecil, Kent, Queen Anne's, Talbot	10 hr
Aug 10, 1:05 PM EDT	Mesoscale Discussion	SPC	Caroline, Cecil, Harford, Kent, Queen Anne's, Wicomico and 1 more	85 min
Aug 10, 1:36 PM EDT	Severe Thunderstorm Watch	SPC	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Dorchester and 11 more	7 hr
Aug 10, 1:56 PM EDT	Severe Thunderstorm Watch	SPC	Broome, Chenango, Cortland, Delaware, Madison, Oneida and 3 more	6 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2008 Mesoscale Discussions in New York, 2008 Mesoscale Discussions in Virginia, 2008 Every mesoscale discussion in 2008

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.