Alert archive / Pennsylvania / Mesoscale Discussions in 2022

Mesoscale Discussion 82

January 16, 20224 states

The Storm Prediction Center issued this mesoscale discussion at Jan 16, 2022, 11:12 PM EST for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jan 16, 2022, 11:12 PM EST (04:12 UTC)
Expired: Jan 17, 2022, 2:15 AM EST
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Winter mixed precipitation

Counties Washington County, MD, Adams County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton County, PA, Juniata County, PA, Lebanon County, PA, Perry County, PA, Schuylkill County, PA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Berkeley County, WV, Jefferson County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 116 km from the middle of the area, began a volume at 04:14 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, 4.2 hours before the alert went out and 117 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: 410 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 1051 m²/s²
0-3 km storm-relative helicity: 1588 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 16, 8:38 PM EST	Mesoscale Discussion	SPC	Beaver, Butler, Clarion, Crawford, Erie, Forest and 5 more	6 hr
Jan 17, 2:24 AM EST	Mesoscale Discussion	SPC	Erie	6 hr
Jan 17, 8:22 AM EST	Mesoscale Discussion	SPC	Erie	6 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2022 Mesoscale Discussions in Virginia, 2022 Mesoscale Discussions in West Virginia, 2022 Every mesoscale discussion in 2022

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.