Alert archive / Ohio / Mesoscale Discussions in 2004

Mesoscale Discussion 2045

August 19, 200434 counties in Ohio; 7 counties in Pennsylvania; 9 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2004, 1:41 PM EDT for 34 counties in Ohio; 7 counties in Pennsylvania; 9 counties in West Virginia. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Aug 19, 2004, 1:41 PM EDT (17:41 UTC)
Expired: Aug 19, 2004, 2:45 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

All 50 counties

Belmont County, OH, Butler County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Coshocton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Madison County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Preble County, OH, Ross County, OH, Tuscarawas County, OH, Union County, OH, Warren County, OH, Washington County, OH, Allegheny County, PA, Beaver County, PA, Fayette County, PA, Greene County, PA, Indiana County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marion County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Preston County, WV, Tyler County, WV, Wetzel County, WV

The radar

The Cincinnati radar (KILN), 130 km from the middle of the area, began a volume at 17:41 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 12:00Z, 5.7 hours before the alert went out and 209 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: 21 J/kg
Mixed-layer CIN: -234 J/kg
Mixed-layer LCL: 963 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 104 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
Aug 19, 2:30 PM EDT	Severe Thunderstorm Watch	SPC	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 4 more	6 hr
Aug 19, 3:00 PM EDT	Severe Thunderstorm Watch	SPC	Butler, Champaign, Clark, Darke, Delaware, Fairfield and 15 more	5 hr
Aug 19, 5:02 PM EDT	Mesoscale Discussion	SPC	Belmont, Butler, Carroll, Champaign, Clark, Columbiana and 32 more	88 min
Aug 19, 7:26 PM EDT	Mesoscale Discussion	SPC	Belmont, Carroll, Clark, Coshocton, Fairfield, Franklin and 12 more	64 min
Aug 19, 6:10 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Chester, Delaware, Lancaster, York	4 hr

Nearby

Mesoscale Discussions in Ohio, 2004 Mesoscale Discussions in West Virginia, 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.