Alert archive / Pennsylvania / Mesoscale Discussions in 2005

Mesoscale Discussion 2125

August 30, 20056 counties in Maryland; 15 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Aug 30, 2005, 10:19 PM EDT for 6 counties in Maryland; 15 counties in Pennsylvania. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Aug 30, 2005, 10:19 PM EDT (02:19 UTC)
Expired: Aug 31, 2005, 12:15 AM EDT
In force: 116 min
Issued by: the Storm Prediction Center

All 21 counties

Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Harford County, MD, Howard County, MD, Washington County, MD, Adams County, PA, Berks County, PA, Carbon County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, York County, PA

The radar

The Sterling radar (KLWX), 119 km from the middle of the area, began a volume at 02:21 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.3 hours before the alert went out and 118 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: 1575 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 12.8

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 30, 8:25 PM EDT	Mesoscale Discussion	SPC	Calvert, Charles, Frederick, Montgomery, Prince George's	2 hr
Aug 31, 2:47 AM EDT	Mesoscale Discussion	SPC	Bedford, Blair, Bradford, Cambria, Cameron, Carbon and 32 more	88 min
Aug 31, 2:55 AM EDT	Tornado Watch	SPC	Adams, Bedford, Berks, Blair, Bradford, Cambria and 34 more	6 hr
Aug 31, 7:22 AM EDT	Mesoscale Discussion	SPC	Bradford, Carbon, Columbia, Lackawanna, Luzerne, Lycoming and 12 more	83 min

Nearby

Mesoscale Discussions in Pennsylvania, 2005 Mesoscale Discussions in Maryland, 2005 Every mesoscale discussion in 2005

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.