Alert archive / New York / Mesoscale Discussions in 2004

Mesoscale Discussion 365

April 18, 200416 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2004, 10:29 AM EDT for 16 counties in New York. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 18, 2004, 10:29 AM EDT (14:29 UTC)
Expired: Apr 18, 2004, 1:00 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Cayuga County, NY, Cortland County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Madison County, NY, Monroe County, NY, Niagara County, NY, Onondaga County, NY, Ontario County, NY, Orleans County, NY, Oswego County, NY, Seneca County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY

The radar

The Buffalo radar (KBUF), 85 km from the middle of the area, began a volume at 14:28 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 81Apr 18, 11:45 AM EDT

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 2.5 hours before the alert went out and 82 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: 1052 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 151 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
Apr 18, 11:45 AM EDT	Severe Thunderstorm Watch	SPC	Cayuga, Chenango, Cortland, Delaware, Livingston, Madison and 11 more	5 hr
Apr 18, 2:17 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Cayuga, Chenango, Columbia, Cortland and 21 more	118 min
Apr 18, 3:25 PM EDT	Severe Thunderstorm Watch	SPC	Albany, Columbia, Delaware, Dutchess, Greene, Otsego and 3 more	4 hr
Apr 18, 4:55 PM EDT	Mesoscale Discussion	SPC	Albany, Columbia, Dutchess, Greene, Ulster	65 min

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.