Alert archive / New York / Mesoscale Discussions in 2004

Mesoscale Discussion 846

May 23, 200410 counties in New York; McKean County, Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at May 23, 2004, 3:27 PM EDT for 10 counties in New York; McKean County, Pennsylvania. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 23, 2004, 3:27 PM EDT (19:27 UTC)
Expired: May 23, 2004, 5:30 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Ontario County, NY, Steuben County, NY, Wyoming County, NY, Yates County, NY, McKean County, PA

The radar

The Buffalo radar (KBUF), 66 km from the middle of the area, began a volume at 19:27 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 263May 23, 4:40 PM EDT

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 7.5 hours before the alert went out and 377 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: 601 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 150 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 22, 8:18 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 13 more	117 min
May 22, 10:50 PM EDT	Tornado Watch	SPC	Broome, Chemung, Chenango, Cortland, Delaware, Madison and 9 more	4 hr
May 23, 12:04 AM EDT	Mesoscale Discussion	SPC	Broome, Chemung, Chenango, Cortland, Delaware, Madison and 9 more	56 min
May 23, 4:40 PM EDT	Severe Thunderstorm Watch	SPC	Bronx, Broome, Chemung, Delaware, Dutchess, Kings and 14 more	5 hr
May 23, 6:45 PM EDT	Mesoscale Discussion	SPC	Allegany, Bronx, Broome, Chemung, Delaware, Dutchess and 16 more	90 min

Nearby

Mesoscale Discussions in New York, 2004 Mesoscale Discussions in Pennsylvania, 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.