Alert archive / Illinois / Mesoscale Discussions in 2018
Mesoscale Discussion 697
The Storm Prediction Center issued this mesoscale discussion at Jun 10, 2018, 2:42 PM CDT for 26 counties in Illinois; 21 counties in Indiana. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Jun 10, 2018, 2:42 PM CDT (19:42 UTC)
- Expired
- Jun 10, 2018, 4:15 PM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 47 counties
Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Jasper County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Shelby County, IL, Vermilion County, IL, Benton County, IN, Boone County, IN, Clay County, IN, Daviess County, IN, Fountain County, IN, Greene County, IN, Hendricks County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN
The radar
The Lincoln radar (KILX), 134 km from the middle of the area, began a volume at 19:41 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
Lincoln, IL (KILX), launched 12:00Z, 7.7 hours before the alert went out and 87 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
- 585 J/kg
- Mixed-layer CIN
- -193 J/kg
- Mixed-layer LCL
- 611 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 362 m²/s²
- 0-3 km storm-relative helicity
- 382 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.2
The text
As transmitted.
150
ACUS11 KWNS 101942
SWOMCD
SPC MCD 101942
INZ000-ILZ000-102115-
Mesoscale Discussion 0697
NWS Storm Prediction Center Norman OK
0242 PM CDT Sun Jun 10 2018
Areas affected...East-Central IL...West-Central IN
Concerning...Severe Thunderstorm Watch 168...
Valid 101942Z - 102115Z
The severe weather threat for Severe Thunderstorm Watch 168
continues.
SUMMARY...Threat for damaging wind gusts and perhaps a tornado or
two continues across east-central IL. Downstream threat across
west-central IN will likely merit the issuance of another watch
soon.
DISCUSSION...MCS moving across central IL has recently exhibited an
increase in forward motion, likely as a result of increased forward
propagation into the warm, moist, and inhibition-free airmass
downstream. New storm development as also occurred ahead of the
line, increasing the probability for continued forward propagation.
Current storm motion is estimated as 310 degrees at 35 kt. Northern
portion of the line appears to be moving a little faster (i.e.
closer to 40 kt). This southeastward progression will likely take
the northern portion of the line to the edge of Severe Thunderstorm
Watch 168 by 20Z. Downstream airmass across west-central/southern IN
remains favorable for continued MCS progression and downstream watch
will likely be needed soon.
One other item of note is the increased southeasterly winds in place
immediately along the warm front draped from near CMI southward into
far southwest IN. Resulting localized enhancement of the low-level
shear may contribute to brief tornado potential.
..Mosier/Grams.. 06/10/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...IND...LOT...ILX...LSX...
LAT...LON 40108999 40648848 40668734 40258643 39168623 38728650
38608719 38628771 38758858 39118956 40108999SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 7:43 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Carroll, Henry, Jo Daviess, Lee, Ogle and 5 more | 6 hr |
| Jun 9, 10:17 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Henry, Jo Daviess, LaSalle and 8 more | 118 min |
| Jun 9, 11:44 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Henry, Jo Daviess, LaSalle and 8 more | 2 hr |
| Jun 10, 10:04 AM CDT | Mesoscale Discussion | SPC | Bond, Cass, Champaign, Christian, Clark, Clay and 43 more | 116 min |
| Jun 10, 12:17 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Cass, Christian, Clark, Clay and 34 more | 118 min |
| Jun 10, 12:46 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 7 hr |
| Jun 10, 2:56 PM CDT | Severe Thunderstorm Watch | SPC | Edwards, Wabash, Wayne, White | 5 hr |
| Jun 10, 4:30 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 3 more | 90 min |
| Jun 10, 5:20 PM CDT | Mesoscale Discussion | SPC | Edwards, Lawrence, Wabash, Wayne, White | 85 min |
Nearby
Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Indiana, 2018Every mesoscale discussion in 2018
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.