Alert archive / New York / Mesoscale Discussions in 2015

Mesoscale Discussion 622

May 11, 201512 counties in New York; McKean County, Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at May 11, 2015, 10:10 PM EDT for 12 counties in New York; McKean County, Pennsylvania. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: May 11, 2015, 10:10 PM EDT (02:10 UTC)
Expired: May 11, 2015, 11:45 PM EDT
In force: 95 min
Issued by: the Storm Prediction Center

Counties Allegany County, NY, Cattaraugus County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Ontario County, NY, Orleans County, NY, Seneca County, NY, Steuben County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, McKean County, PA

The radar

The Buffalo radar (KBUF), 87 km from the middle of the area, began a volume at 02:13 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, 2.2 hours before the alert went out and 84 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: 14 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 1723 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 11, 8:18 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 4 more	4 hr

Nearby

Mesoscale Discussions in New York, 2015 Mesoscale Discussions in Pennsylvania, 2015 Every mesoscale discussion in 2015

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.