Alert archive / New York / Mesoscale Discussions in 2014

Mesoscale Discussion 1928

November 20, 201420 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Nov 20, 2014, 9:14 AM EST for 20 counties in New York. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Nov 20, 2014, 9:14 AM EST (14:14 UTC)
Expired: Nov 20, 2014, 1:45 PM EST
In force: 5 hr
Issued by: the Storm Prediction Center

Counties Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Jefferson County, NY, Lewis County, NY, Livingston County, NY, Monroe County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Orleans County, NY, Oswego County, NY, Seneca County, NY, St. Lawrence County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY

The radar

The Ft Drum radar (KTYX), 112 km from the middle of the area, began a volume at 14:13 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 12:00Z, 2.2 hours before the alert went out and 152 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: 1231 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: -10 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
Nov 20, 1:52 PM EST	Mesoscale Discussion	SPC	Erie, Wyoming	5 hr
Nov 20, 2:33 PM EST	Mesoscale Discussion	SPC	Lewis	4 hr

Nearby

Mesoscale Discussions in New York, 2014 Every mesoscale discussion in 2014

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.