Alert archive / New York / Mesoscale Discussions in 2020

Mesoscale Discussion 787

June 2, 202010 counties in New York; 4 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2020, 9:26 PM EDT for 10 counties in New York; 4 counties in Pennsylvania. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jun 2, 2020, 9:26 PM EDT (01:26 UTC)
Expired: Jun 3, 2020, 12:00 AM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

Counties Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Niagara County, NY, Orleans County, NY, Steuben County, NY, Wyoming County, NY, McKean County, PA, Potter County, PA, Tioga County, PA, Warren County, PA

The radar

The Buffalo radar (KBUF), 14 km from the middle of the area, began a volume at 01:26 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

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 1.4 hours before the alert went out and 15 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: 1280 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 240 m²/s²
0-3 km storm-relative helicity: 288 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
Jun 3, 5:12 AM EDT	Mesoscale Discussion	SPC	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 3 more	2 hr
Jun 3, 6:58 PM EDT	Mesoscale Discussion	SPC	Bronx, Kings, Nassau, New York, Orange, Queens and 4 more	92 min
Jun 3, 8:32 AM EDT	Mesoscale Discussion	SPC	Adams, Armstrong, Berks, Blair, Bradford, Butler and 38 more	118 min
Jun 3, 10:08 AM EDT	Severe Thunderstorm Watch	SPC	Adams, Berks, Blair, Bucks, Cambria, Carbon and 29 more	4 hr
Jun 3, 11:34 AM EDT	Mesoscale Discussion	SPC	Adams, Berks, Bucks, Carbon, Chester, Cumberland and 11 more	86 min
Jun 3, 3:10 PM EDT	Mesoscale Discussion	SPC	Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 32 more	2 hr
Jun 3, 3:52 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Berks, Bucks, Cameron, Centre, Chester and 20 more	6 hr
Jun 3, 7:44 PM EDT	Mesoscale Discussion	SPC	Berks, Bucks, Chester, Cumberland, Dauphin, Delaware and 6 more	91 min

Nearby

Mesoscale Discussions in New York, 2020 Mesoscale Discussions in Pennsylvania, 2020 Every mesoscale discussion in 2020

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.