Alert archive / Ohio / Mesoscale Discussions in 2008

Mesoscale Discussion 1990

August 1, 200816 counties in Ohio; Crawford County, Mercer County, Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2008, 10:56 PM EDT for 16 counties in Ohio; Crawford County, Mercer County, Pennsylvania. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Aug 1, 2008, 10:56 PM EDT (02:56 UTC)
Expired: Aug 2, 2008, 12:30 AM EDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Ashland County, OH, Ashtabula County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Mahoning County, OH, Medina County, OH, Portage County, OH, Richland County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Wayne County, OH, Crawford County, PA, Mercer County, PA

The radar

The Cleveland radar (KCLE), 39 km from the middle of the area, began a volume at 02:56 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

Pittsburgh, PA (KPIT), launched 00:00Z, 2.9 hours before the alert went out and 154 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: 25 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1748 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Aug 1, 8:43 PM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Champaign, Clark, Darke, Defiance and 25 more	62 min
Aug 1, 10:17 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Butler, Champaign, Clark, Clermont and 23 more	3 hr
Aug 2, 10:11 AM EDT	Mesoscale Discussion	SPC	Berks, Bucks, Montgomery, Philadelphia	94 min
Aug 2, 10:39 AM EDT	Severe Thunderstorm Watch	SPC	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more	9 hr
Aug 2, 1:18 PM EDT	Mesoscale Discussion	SPC	Adams, York	57 min
Aug 2, 1:56 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Bedford, Fayette, Franklin, Fulton, Greene and 3 more	8 hr
Aug 2, 7:09 PM EDT	Mesoscale Discussion	SPC	Adams, Lancaster, York	96 min

Nearby

Mesoscale Discussions in Ohio, 2008 Mesoscale Discussions in Pennsylvania, 2008 Every mesoscale discussion in 2008

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.