Alert archive / Ohio / Mesoscale Discussions in 2004

Mesoscale Discussion 570

May 6, 2004Cattaraugus County, Chautauqua County, New York; 13 counties in Ohio; 9 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at May 6, 2004, 11:05 PM EDT for Cattaraugus County, Chautauqua County, New York; 13 counties in Ohio; 9 counties in Pennsylvania. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
May 6, 2004, 11:05 PM EDT (03:05 UTC)
Expired
May 7, 2004, 12:30 AM EDT
In force
85 min
Issued by
the Storm Prediction Center
All 24 counties

Cattaraugus County, NY, Chautauqua County, NY, Ashland County, OH, Ashtabula County, OH, Cuyahoga County, OH, Geauga County, OH, Lake County, OH, Lorain County, OH, Mahoning County, OH, Medina County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Wayne County, OH, Clarion County, PA, Crawford County, PA, Erie County, PA, Forest County, PA, Lawrence County, PA, McKean County, PA, Mercer County, PA, Venango County, PA, Warren County, PA

The radar

The Cleveland radar (KCLE), 87 km from the middle of the area, began a volume at 03:08 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.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 3.1 hours before the alert went out and 147 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-pSkew-T log-p diagram, Pittsburgh, PA at 00:00Z on 2004-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 359 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 00:00Z on 2004-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
359 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
1805 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

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.

IssuedProductOfficeCountiesLasted
May 6, 11:20 PM EDTSevere Thunderstorm WatchSPCCattaraugus, Chautauqua5 hr
May 7, 3:13 AM EDTMesoscale DiscussionSPCCattaraugus, Chautauqua62 min
May 6, 9:37 PM EDTMesoscale DiscussionSPCDefiance, Erie, Fulton, Henry, Huron, Lucas and 7 more83 min
May 6, 10:10 PM EDTSevere Thunderstorm WatchSPCAllen, Crawford, Defiance, Fulton, Hancock, Henry and 11 more5 hr
May 7, 7:38 AM EDTMesoscale DiscussionSPCMercer97 min
May 7, 9:30 AM EDTMesoscale DiscussionSPCAllen, Auglaize, Champaign, Clark, Coshocton, Darke and 26 more90 min
May 7, 9:30 AM EDTSevere Thunderstorm WatchSPCAllen, Auglaize, Butler, Champaign, Clark, Clinton and 24 more6 hr
May 7, 10:29 AM EDTMesoscale DiscussionSPCAthens, Belmont, Carroll, Coshocton, Guernsey, Harrison and 9 more91 min
May 7, 11:00 AM EDTSevere Thunderstorm WatchSPCAthens, Belmont, Coshocton, Gallia, Guernsey, Harrison and 10 more6 hr
May 7, 12:49 PM EDTMesoscale DiscussionSPCAthens, Champaign, Clark, Clinton, Delaware, Fairfield and 24 more86 min
May 7, 1:49 PM EDTMesoscale DiscussionSPCAthens, Belmont, Gallia, Guernsey, Harrison, Hocking and 7 more86 min
May 7, 1:24 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Montgomery, Philadelphia96 min
May 7, 1:40 PM EDTSevere Thunderstorm WatchSPCChester, Delaware, Montgomery, Philadelphia3 hr

Nearby

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