Alert archive / New York / Mesoscale Discussions in 2012

Mesoscale Discussion 1712

August 5, 201219 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Aug 5, 2012, 4:21 PM EDT for 19 counties in New York. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Aug 5, 2012, 4:21 PM EDT (20:21 UTC)
Expired: Aug 5, 2012, 5:45 PM EDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Cayuga County, NY, Clinton County, NY, Cortland County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Jefferson County, NY, Lewis County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Oswego County, NY, Saratoga County, NY, Seneca County, NY, St. Lawrence County, NY, Warren County, NY

The radar

The Ft Drum radar (KTYX), 62 km from the middle of the area, began a volume at 20:22 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 12:00Z, 8.4 hours before the alert went out and 186 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: 520 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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
Aug 5, 12:06 PM EDT	Mesoscale Discussion	SPC	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	84 min
Aug 5, 12:42 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Cattaraugus, Cayuga, Chautauqua, Chemung, Cortland and 20 more	6 hr
Aug 5, 2:49 PM EDT	Mesoscale Discussion	SPC	Bronx, Broome, Chemung, Chenango, Delaware, Dutchess and 10 more	86 min
Aug 5, 6:38 PM EDT	Mesoscale Discussion	SPC	Bronx, Kings, Nassau, New York, Putnam, Queens and 4 more	2 hr

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.