Alert archive / Ohio / Mesoscale Discussions in 2007

Mesoscale Discussion 815

May 15, 200719 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 15, 2007, 11:08 PM EDT for 19 counties in Ohio. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: May 15, 2007, 11:08 PM EDT (03:08 UTC)
Expired: May 16, 2007, 12:15 AM EDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Clermont County, OH, Clinton County, OH, Coshocton County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Knox County, OH, Licking County, OH, Madison County, OH, Muskingum County, OH, Perry County, OH, Pickaway County, OH, Ross County, OH, Tuscarawas County, OH

The radar

The Cincinnati radar (KILN), 105 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.

Severe Thunderstorm Watch 276May 15, 11:25 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 3.1 hours before the alert went out and 103 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: 42 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1871 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 15, 11:26 PM EDT	Severe Thunderstorm Watch	SPC	Clark, Clinton, Delaware, Fairfield, Fayette, Franklin and 11 more	115 min
May 16, 12:46 AM EDT	Mesoscale Discussion	SPC	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 8 more	59 min

Nearby

Mesoscale Discussions in Ohio, 2007 Every mesoscale discussion in 2007

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.