Alert archive / Pennsylvania / Mesoscale Discussions in 2004

Mesoscale Discussion 819

May 22, 2004Allegany County, Cattaraugus County, New York; Trumbull County, Ohio; 11 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at May 22, 2004, 1:26 PM EDT for Allegany County, Cattaraugus County, New York; Trumbull County, Ohio; 11 counties in Pennsylvania. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: May 22, 2004, 1:26 PM EDT (17:26 UTC)
Expired: May 22, 2004, 3:00 PM EDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Allegany County, NY, Cattaraugus County, NY, Trumbull County, OH, Cameron County, PA, Clarion County, PA, Crawford County, PA, Elk County, PA, Forest County, PA, Jefferson County, PA, McKean County, PA, Mercer County, PA, Potter County, PA, Venango County, PA, Warren County, PA

The radar

The Pittsburgh radar (KPBZ), 144 km from the middle of the area, began a volume at 17:27 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 nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.4 hours before the alert went out and 151 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: 580 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 270 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, 5:23 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 11 more	97 min
May 22, 5:45 PM EDT	Tornado Watch	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 13 more	5 hr
May 22, 2:25 AM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Belmont, Carroll, Columbiana, Coshocton and 33 more	2 hr
May 22, 2:48 AM EDT	Mesoscale Discussion	SPC	Defiance, Erie, Fulton, Hancock, Henry, Huron and 8 more	57 min
May 22, 12:35 PM EDT	Severe Thunderstorm Watch	SPC	Defiance, Williams	6 hr
May 22, 3:36 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Champaign, Coshocton, Crawford and 36 more	54 min
May 22, 4:20 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Ashland, Ashtabula, Auglaize, Champaign, Coshocton and 36 more	8 hr
May 22, 6:29 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Ashtabula, Auglaize, Champaign, Coshocton and 35 more	91 min

Nearby

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