Alert archive / Ohio / Mesoscale Discussions in 2018

Mesoscale Discussion 1248

August 6, 201819 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2018, 4:44 PM EDT for 19 counties in Ohio. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Aug 6, 2018, 4:44 PM EDT (20:44 UTC)
Expired
Aug 6, 2018, 5:45 PM EDT
In force
61 min
Issued by
the Storm Prediction Center

Counties Allen County, OH, Crawford County, OH, Defiance County, OH, Erie County, OH, Fulton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Huron County, OH, Lucas County, OH, Marion County, OH, Morrow County, OH, Ottawa County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Wood County, OH, Wyandot County, OH

The radar

The Cleveland radar (KCLE), 132 km from the middle of the area, began a volume at 20:48 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

Detroit, MI (KDTX), launched 12:00Z, 8.7 hours before the alert went out and 172 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, Detroit, MI at 12:00Z on 2018-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2085 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, Detroit, MI at 12:00Z on 2018-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.1939Sfc1 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
2085 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
834 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 6, 1:26 PM EDTMesoscale DiscussionSPCDefiance, Fulton, Henry, Lucas, Ottawa, Paulding and 2 more3 hr
Aug 6, 1:47 PM EDTSevere Thunderstorm WatchSPCFulton, Williams5 hr
Aug 6, 3:12 PM EDTMesoscale DiscussionSPCAshtabula, Cuyahoga, Erie, Geauga, Lake, Lorain3 hr

Nearby

Mesoscale Discussions in Ohio, 2018Every mesoscale discussion in 2018

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.