Alert archive / Ohio / Mesoscale Discussions in 2021
Mesoscale Discussion 1386
The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2021, 5:55 AM EDT for 12 counties in Indiana; Hillsdale County, Lenawee County, Monroe County, Michigan; 19 counties in Ohio. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2021, 5:55 AM EDT (09:55 UTC)
- Expired
- Jul 29, 2021, 7:30 AM EDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 400
All 34 counties
Adams County, IN, Allen County, IN, Blackford County, IN, DeKalb County, IN, Grant County, IN, Huntington County, IN, Jay County, IN, Miami County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Hillsdale County, MI, Lenawee County, MI, Monroe County, MI, Allen County, OH, Auglaize County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Logan County, OH, Lucas County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH
The radar
The Northern Indiana radar (KIWX), 87 km from the middle of the area, began a volume at 09:53 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
Cncnati-Daytn, OH (KILN), launched 00:00Z, 9.9 hours before the alert went out and 200 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
- 1533 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1165 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.4
The text
As transmitted.
400
ACUS11 KWNS 290955
SWOMCD
SPC MCD 290955
OHZ000-MIZ000-INZ000-291130-
Mesoscale Discussion 1386
NWS Storm Prediction Center Norman OK
0455 AM CDT Thu Jul 29 2021
Areas affected...Portions of northeastern IN...northwestern OH...and
far southern Lower MI
Concerning...Severe Thunderstorm Watch 400...
Valid 290955Z - 291130Z
The severe weather threat for Severe Thunderstorm Watch 400
continues.
SUMMARY...An isolated wind threat continues in the short term.
Downstream watch issuance this morning is not currently expected.
DISCUSSION...The northeastern segment of an MCS has persisted early
this morning across parts of northern IN. A measured wind gust to 65
mph associated with this MCS was recorded at 0915Z at the Goshen
Airport ASOS. Based on recent velocity data from the KIWX radar, a
continued threat for isolated strong to severe winds should continue
in the short term across portions of northeastern IN. The airmass is
less unstable downstream into northwestern OH and far southeastern
Lower MI per recent mesoanalysis estimates, with MLCAPE generally
500-1000 J/kg. While a threat for occasional strong/gusty winds may
continue with this small cluster across northwestern OH and
vicinity, the overall severe threat appears rather isolated.
Therefore, downstream watch issuance this morning is unlikely at
this time.
..Gleason.. 07/29/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...CLE...ILN...DTX...IWX...IND...
LAT...LON 40798622 41408525 41908512 42018468 42028315 41078302
40388344 40148449 40298574 40798622SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 1:32 AM EDT | Mesoscale Discussion | SPC | Elkhart, Fulton, Jasper, Kosciusko, LaGrange, Lake and 7 more | 88 min |
| Jul 29, 2:00 AM EDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Benton, Cass, DeKalb, Elkhart and 20 more | 5 hr |
| Jul 29, 4:18 AM EDT | Mesoscale Discussion | SPC | Elkhart, Fulton, Jasper, Kosciusko, LaGrange, Lake and 7 more | 87 min |
| Jul 29, 3:13 PM EDT | Severe Thunderstorm Watch | SPC | Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more | 7 hr |
| Jul 29, 3:19 PM EDT | Mesoscale Discussion | SPC | Boone, Brown, Clay, Fountain, Greene, Hamilton and 17 more | 116 min |
| Jul 29, 6:34 PM EDT | Mesoscale Discussion | SPC | Dearborn, Fayette, Franklin, Henry, Rush, Union and 1 more | 116 min |
| Jul 29, 2:48 PM EDT | Mesoscale Discussion | SPC | Adams, Athens, Brown, Butler, Champaign, Clark and 35 more | 117 min |
Nearby
Mesoscale Discussions in Ohio, 2021Mesoscale Discussions in Indiana, 2021Mesoscale Discussions in Michigan, 2021Every mesoscale discussion in 2021
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.