Alert archive / Ohio / Mesoscale Discussions in 2007

Mesoscale Discussion 636

May 1, 20074 states

The Storm Prediction Center issued this mesoscale discussion at May 1, 2007, 12:09 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2007, 12:09 PM CDT (17:09 UTC)
Expired: May 1, 2007, 2:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 42 counties

Will County, IL, Allen County, IN, DeKalb County, IN, Elkhart County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Noble County, IN, Porter County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Hillsdale County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Monroe County, MI, Saint Joseph County, MI, Van Buren County, MI, Washtenaw County, MI, Defiance County, OH, Erie County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Huron County, OH, Lorain County, OH, Lucas County, OH, Ottawa County, OH, Paulding County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Williams County, OH, Wood County, OH

The radar

The Northern Indiana radar (KIWX), 46 km from the middle of the area, began a volume at 17:12 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 205May 1, 1:05 PM CDT

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 5.2 hours before the alert went out and 195 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 241 m²/s²
0-3 km storm-relative helicity: 284 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
May 1, 1:01 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Benton, Blackford, Cass, DeKalb and 23 more	6 hr
May 1, 2:53 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Carroll, Cass and 26 more	97 min
May 1, 5:35 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Carroll, Cass and 18 more	85 min
May 1, 3:22 PM CDT	Severe Thunderstorm Watch	SPC	Ashtabula, Belmont, Carroll, Columbiana, Coshocton, Cuyahoga and 17 more	7 hr

Nearby

Mesoscale Discussions in Ohio, 2007 Mesoscale Discussions in Indiana, 2007 Mesoscale Discussions in Michigan, 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.