Alert archive / Ohio / Mesoscale Discussions in 2007

Mesoscale Discussion 1695

August 9, 200754 counties in Ohio; 9 counties in Pennsylvania; 8 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2007, 11:54 AM EDT for 54 counties in Ohio; 9 counties in Pennsylvania; 8 counties in West Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 9, 2007, 11:54 AM EDT (15:54 UTC)
Expired
Aug 9, 2007, 2:00 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 71 counties

Allen County, OH, Ashland County, OH, Auglaize County, OH, Belmont County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Hocking County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Mercer County, OH, Miami County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Portage County, OH, Putnam County, OH, Richland County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Van Wert County, OH, Washington County, OH, Wayne County, OH, Wyandot County, OH, Allegheny County, PA, Beaver County, PA, Butler County, PA, Fayette County, PA, Greene County, PA, Lawrence County, PA, Mercer County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Pleasants County, WV, Tyler County, WV, Wetzel County, WV

The radar

The Cleveland radar (KCLE), 114 km from the middle of the area, began a volume at 15:56 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 3.9 hours before the alert went out and 163 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, Cncnati-Daytn, OH at 12:00Z on 2007-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1945 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, Cncnati-Daytn, OH at 12:00Z on 2007-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 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
1945 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
1082 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.6

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
Aug 9, 1:22 PM EDTSevere Thunderstorm WatchSPCAshland, Ashtabula, Auglaize, Belmont, Carroll, Champaign and 43 more7 hr
Aug 9, 3:05 PM EDTMesoscale DiscussionSPCDarke, Mercer, Preble85 min
Aug 9, 5:03 PM EDTMesoscale DiscussionSPCAshland, Belmont, Carroll, Columbiana, Coshocton, Crawford and 25 more87 min
Aug 9, 7:23 PM EDTMesoscale DiscussionSPCAdams, Allen, Ashland, Athens, Auglaize, Belmont and 68 more67 min
Aug 9, 8:47 AM EDTMesoscale DiscussionSPCAdams, Bedford, Cumberland, Franklin, Fulton, Huntingdon and 1 more58 min
Aug 9, 9:47 AM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Blair, Cambria, Centre, Clearfield and 13 more6 hr
Aug 9, 2:41 PM EDTMesoscale DiscussionSPCBedford, Cambria, Fayette, Franklin, Fulton, Indiana and 2 more94 min

Nearby

Mesoscale Discussions in Ohio, 2007Mesoscale Discussions in Pennsylvania, 2007Mesoscale Discussions in West Virginia, 2007Every 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.