Alert archive / Ohio / Mesoscale Discussions in 2021
Mesoscale Discussion 2004
The Storm Prediction Center issued this mesoscale discussion at Dec 11, 2021, 12:08 AM EST for 22 counties in Indiana; 14 counties in Kentucky; 25 counties in Ohio. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Dec 11, 2021, 12:08 AM EST (05:08 UTC)
- Expired
- Dec 11, 2021, 1:15 AM EST
- In force
- 67 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch likely
- Chance of a watch
- 80%
All 61 counties
Dearborn County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Hamilton County, IN, Hancock County, IN, Henry County, IN, Jay County, IN, Jefferson County, IN, Jennings County, IN, Madison County, IN, Marion County, IN, Ohio County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Switzerland County, IN, Tipton County, IN, Union County, IN, Wayne County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Harrison County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Trimble County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Logan County, OH, Madison County, OH, Miami County, OH, Montgomery County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Union County, OH, Warren County, OH
The radar
The Cincinnati radar (KILN), 62 km from the middle of the area, began a volume at 05:06 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 00:00Z, 5.1 hours before the alert went out and 64 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
- 519 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 325 m²/s²
- 0-3 km storm-relative helicity
- 431 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
385
ACUS11 KWNS 110508
SWOMCD
SPC MCD 110508
OHZ000-KYZ000-INZ000-110615-
Mesoscale Discussion 2004
NWS Storm Prediction Center Norman OK
1108 PM CST Fri Dec 10 2021
Areas affected...Eastern Indiana...western Ohio...and far northern
Kentucky.
Concerning...Severe potential...Watch likely
Valid 110508Z - 110615Z
Probability of Watch Issuance...80 percent
SUMMARY...A downstream tornado watch is likely across portions of
eastern Indiana, western Ohio, and possibly northern Kentucky.
DISCUSSION...The low-level airmass is still a bit on the dry side
across portions of eastern Indiana and western Ohio where dewpoints
are in the upper 50s. However, low-level moisture advection is
forecast to increase dewpoints into the low 60s across this region
in the next 2 to 3 hours. This should be sufficient moisture to
continue a threat for damaging wind and a few tornadoes as storms
move out of central Indiana. Therefore, a downstream tornado watch
will likely be issued in the next 1 to 2 hours.
..Bentley/Grams.. 12/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...JKL...ILN...LMK...IWX...IND...
LAT...LON 40368613 40508463 40478370 40178280 39578275 38848286
38398349 38368401 38318479 38618540 39528608 39958627
40368613SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 7:21 PM EST | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 10 hr |
| Dec 10, 8:18 PM EST | Mesoscale Discussion | SPC | Bartholomew, Benton, Boone, Brown, Carroll, Cass and 37 more | 87 min |
| Dec 10, 8:47 PM EST | Tornado Watch | SPC | Bartholomew, Benton, Boone, Brown, Clay, Clinton and 24 more | 8 hr |
| Dec 10, 9:35 PM EST | Mesoscale Discussion | SPC | Harrison | 85 min |
| Dec 10, 10:36 PM EST | Mesoscale Discussion | SPC | Vigo | 54 min |
| Dec 10, 11:25 PM EST | Mesoscale Discussion | SPC | Bartholomew, Benton, Blackford, Boone, Brown, Carroll and 50 more | 95 min |
| Dec 11, 12:03 AM EST | Tornado Watch | SPC | Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick | 5 hr |
| Dec 11, 12:20 AM EST | Tornado Watch | SPC | Adams, Allen, Blackford, Carroll, Cass, Dearborn and 27 more | 6 hr |
| Dec 11, 12:28 AM EST | Mesoscale Discussion | SPC | Clay, Daviess, Fountain, Gibson, Greene, Knox and 9 more | 92 min |
| Dec 11, 2:46 AM EST | Mesoscale Discussion | SPC | Bartholomew, Brown, Daviess, Dearborn, Decatur, Delaware and 21 more | 59 min |
| Dec 10, 7:22 PM EST | Mesoscale Discussion | SPC | Fulton, Graves, Hickman | 53 min |
| Dec 10, 8:41 PM EST | Mesoscale Discussion | SPC | Fulton | 64 min |
| Dec 10, 9:48 PM EST | Mesoscale Discussion | SPC | Carlisle, Fulton, Graves, Hickman, Lyon, Marshall | 57 min |
| Dec 10, 10:48 PM EST | Mesoscale Discussion | SPC | Caldwell, Graves, Hopkins, Lyon, Marshall | 57 min |
| Dec 10, 11:09 PM EST | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 7 more | 96 min |
| Dec 10, 11:44 PM EST | Mesoscale Discussion | SPC | Caldwell, Grayson, Hopkins, McLean, Muhlenberg, Ohio | 61 min |
| Dec 11, 12:36 AM EST | Mesoscale Discussion | SPC | Calloway, Christian, Logan, Simpson, Todd, Trigg | 54 min |
| Dec 11, 12:53 AM EST | Mesoscale Discussion | SPC | Breckinridge, Bullitt, Grayson, Hardin, Jefferson, Meade and 3 more | 67 min |
| Dec 11, 2:02 AM EST | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Bourbon and 51 more | 88 min |
| Dec 11, 2:05 AM EST | Mesoscale Discussion | SPC | Barren, Butler, Edmonson, Green, Hart, Logan and 2 more | 55 min |
| Dec 11, 2:27 AM EST | Tornado Watch | SPC | Adair, Allen, Anderson, Barren, Bath, Bourbon and 51 more | 7 hr |
| Dec 11, 3:51 AM EST | Mesoscale Discussion | SPC | Boyle, Casey, Clark, Estill, Garrard, Jessamine and 4 more | 54 min |
| Dec 11, 6:32 AM EST | Mesoscale Discussion | SPC | Bell, Breathitt, Clark, Clay, Estill, Jackson and 18 more | 88 min |
Nearby
Mesoscale Discussions in Ohio, 2021Mesoscale Discussions in Indiana, 2021Mesoscale Discussions in Kentucky, 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.