Alert archive / New York / Mesoscale Discussions in 2004

Mesoscale Discussion 747

May 18, 200413 counties in New York

The Storm Prediction Center issued this mesoscale discussion at May 18, 2004, 4:38 PM EDT for 13 counties in New York. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 18, 2004, 4:38 PM EDT (20:38 UTC)
Expired: May 18, 2004, 6:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Albany County, NY, Chenango County, NY, Cortland County, NY, Fulton County, NY, Greene County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Otsego County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Warren County, NY

The radar

The Albany radar (KENX), 85 km from the middle of the area, began a volume at 20:38 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, 8.6 hours before the alert went out and 98 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: 6 J/kg
Mixed-layer CIN: -326 J/kg
Mixed-layer LCL: 662 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 186 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
May 18, 12:54 PM EDT	Mesoscale Discussion	SPC	Cattaraugus	66 min
May 18, 1:04 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Cayuga, Chemung, Chenango, Clinton and 28 more	56 min
May 18, 1:50 PM EDT	Severe Thunderstorm Watch	SPC	Albany, Allegany, Broome, Cattaraugus, Cayuga, Chemung and 39 more	8 hr
May 18, 2:54 PM EDT	Mesoscale Discussion	SPC	Bronx, Dutchess, Kings, New York, Orange, Putnam and 3 more	96 min
May 18, 6:24 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Cayuga, Chemung, Chenango, Columbia and 22 more	2 hr

Nearby

Mesoscale Discussions in New York, 2004 Every mesoscale discussion in 2004

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.