Alert archive / Ohio / Mesoscale Discussions in 2017
Mesoscale Discussion 530
The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2017, 7:01 PM EDT for 7 counties in Indiana; 8 counties in Michigan; 25 counties in Ohio. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2017, 7:01 PM EDT (23:01 UTC)
- Expired
- Apr 20, 2017, 8:00 PM EDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 40 counties
Adams County, IN, Allen County, IN, Blackford County, IN, DeKalb County, IN, Jay County, IN, Steuben County, IN, Wells County, IN, Branch County, MI, Calhoun County, MI, Hillsdale County, MI, Jackson County, MI, Lenawee County, MI, Monroe County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Auglaize 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, Logan County, OH, Lucas County, OH, Marion County, OH, Mercer County, OH, Morrow County, OH, Ottawa County, OH, Paulding County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH
The radar
The Detroit radar (KDTX), 136 km from the middle of the area, began a volume at 23:05 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, 11.0 hours before the alert went out and 140 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 543 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 595 m²/s²
- 0-3 km storm-relative helicity
- 665 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 1:36 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, DeKalb, Delaware, Elkhart and 15 more | 84 min |
| Apr 20, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, DeKalb, Grant, Huntington and 6 more | 6 hr |
| Apr 20, 4:31 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 37 more | 119 min |
| Apr 20, 2:40 PM EDT | Mesoscale Discussion | SPC | Ashtabula, Belmont, Carroll, Columbiana, Coshocton, Cuyahoga and 19 more | 65 min |
Nearby
Mesoscale Discussions in Ohio, 2017Mesoscale Discussions in Michigan, 2017Mesoscale Discussions in Indiana, 2017Every mesoscale discussion in 2017
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.