Alert archive / New York / Mesoscale Discussions in 2012

Mesoscale Discussion 1557

July 23, 201218 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2012, 8:39 PM EDT for 18 counties in New York. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2012, 8:39 PM EDT (00:39 UTC)
Expired: Jul 23, 2012, 10:15 PM EDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Niagara County, NY, Onondaga County, NY, Ontario County, NY, Orleans County, NY, Oswego County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY

The radar

The Buffalo radar (KBUF), 103 km from the middle of the area, began a volume at 00:42 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

Albany, NY (KALY), launched 00:00Z, 0.7 hours before the alert went out and 299 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: 1455 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

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
Jul 23, 10:29 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chenango, Clinton, Columbia, Cortland and 24 more	91 min

Nearby

Mesoscale Discussions in New York, 2012 Every mesoscale discussion in 2012

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.