Alert archive / Pennsylvania / Mesoscale Discussions in 2004

Mesoscale Discussion 53

January 27, 20045 states

The Storm Prediction Center issued this mesoscale discussion at Jan 27, 2004, 10:01 AM EST for 5 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jan 27, 2004, 10:01 AM EST (15:01 UTC)
Expired: Jan 27, 2004, 2:00 PM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 59 counties

Allegany County, MD, Carroll County, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD, Washington County, MD, Allegany County, NY, Cattaraugus County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Steuben County, NY, Wyoming County, NY, Adams County, PA, Bedford County, PA, Blair County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Cumberland County, PA, Dauphin County, PA, Elk County, PA, Forest County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lycoming County, PA, McKean County, PA, Mifflin County, PA, Perry County, PA, Potter County, PA, Snyder County, PA, Somerset County, PA, Tioga County, PA, Union County, PA, Warren County, PA, York County, PA, City of Winchester, VA, Clarke County, VA, Fauquier County, VA, Frederick County, VA, Loudoun County, VA, Madison County, VA, Page County, VA, Rappahannock County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV

The radar

The State College radar (KCCX), 24 km from the middle of the area, began a volume at 15:03 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 (KPIT), launched 12:00Z, 3.0 hours before the alert went out and 183 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: 610 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 318 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
Jan 27, 3:36 AM EST	Mesoscale Discussion	SPC	Cattaraugus, Chautauqua, Erie, Genesee, Niagara, Orleans and 1 more	4 hr
Jan 27, 5:28 PM EST	Mesoscale Discussion	SPC	Bronx, Dutchess, Kings, Nassau, New York, Orange and 7 more	5 hr
Jan 27, 7:40 AM EST	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 7 more	4 hr
Jan 27, 7:27 AM EST	Mesoscale Discussion	SPC	Alleghany, Amherst, Augusta, Bath, Bedford, Bland and 34 more	4 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2004 Mesoscale Discussions in Virginia, 2004 Mesoscale Discussions in New York, 2004 Every mesoscale discussion in 2004

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.