Alert archive / Pennsylvania / Mesoscale Discussions in 2003

Mesoscale Discussion 1360

June 12, 200311 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2003, 6:02 PM EDT for 11 counties in Pennsylvania. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2003, 6:02 PM EDT (22:02 UTC)
Expired: Jun 12, 2003, 7:00 PM EDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Allegheny County, PA, Armstrong County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Centre County, PA, Clearfield County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Westmoreland County, PA

The radar

The State College radar (KCCX), 94 km from the middle of the area, began a volume at 22:03 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, 10.0 hours before the alert went out and 92 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: 40 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 920 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 115 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
Jun 12, 12:02 PM EDT	Mesoscale Discussion	SPC	Adams, Chester, Cumberland, Lancaster, York	58 min
Jun 12, 1:20 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Bedford, Berks, Bucks, Chester, Cumberland and 15 more	7 hr
Jun 12, 4:06 PM EDT	Mesoscale Discussion	SPC	Adams, Bedford, Berks, Bucks, Chester, Cumberland and 13 more	114 min

Nearby

Mesoscale Discussions in Pennsylvania, 2003 Every mesoscale discussion in 2003

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.