Alert archive / Pennsylvania / Mesoscale Discussions in 2019

Mesoscale Discussion 759

May 23, 201911 counties in New York; 33 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at May 23, 2019, 7:10 PM EDT for 11 counties in New York; 33 counties in Pennsylvania. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: May 23, 2019, 7:10 PM EDT (23:10 UTC)
Expired: May 23, 2019, 8:15 PM EDT
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 44 counties

Allegany County, NY, Broome County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Livingston County, NY, Schuyler County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Yates County, NY, Bradford County, PA, Cameron County, PA, Carbon County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Dauphin County, PA, Elk County, PA, Forest County, PA, Jefferson County, PA, Juniata County, PA, Lackawanna County, PA, Lebanon County, PA, Luzerne County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Venango County, PA, Warren County, PA, Wyoming County, PA

The radar

The State College radar (KCCX), 88 km from the middle of the area, began a volume at 23:10 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 225May 23, 9:20 PM EDT

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.2 hours before the alert went out and 171 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: 124 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 23, 8:53 AM EDT	Mesoscale Discussion	SPC	Cattaraugus, Chautauqua, Erie, Wyoming	2 hr
May 23, 9:39 AM EDT	Severe Thunderstorm Watch	SPC	Allegany, Cattaraugus, Cayuga, Chautauqua, Chemung, Cortland and 17 more	3 hr
May 23, 6:47 PM EDT	Mesoscale Discussion	SPC	Cayuga, Hamilton, Herkimer, Lewis, Madison, Monroe and 6 more	118 min
May 23, 11:52 AM EDT	Mesoscale Discussion	SPC	Adams, Bedford, Blair, Cambria, Centre, Clinton and 18 more	83 min
May 23, 1:02 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Berks, Chester, Cumberland, Dauphin, Franklin and 6 more	5 hr
May 23, 5:37 PM EDT	Severe Thunderstorm Watch	SPC	Fayette, Greene, Washington	5 hr
May 23, 5:44 PM EDT	Mesoscale Discussion	SPC	Fayette, Greene, Washington	61 min

Nearby

Mesoscale Discussions in Pennsylvania, 2019 Mesoscale Discussions in New York, 2019 Every mesoscale discussion in 2019

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.