Alert archive / Illinois / Mesoscale Discussions in 2013
Mesoscale Discussion 2015
The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2013, 11:57 AM CST for 17 counties in Illinois; 13 counties in Indiana. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Nov 17, 2013, 11:57 AM CST (17:57 UTC)
- Expired
- Nov 17, 2013, 1:30 PM CST
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 30 counties
Champaign County, IL, Coles County, IL, Cook County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Livingston County, IL, Macon County, IL, Moultrie County, IL, Piatt County, IL, Vermilion County, IL, Will County, IL, Benton County, IN, Fountain County, IN, Jasper County, IN, Lake County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Tippecanoe County, IN, Vermillion County, IN, Warren County, IN, White County, IN
The radar
The Chicago radar (KLOT), 96 km from the middle of the area, began a volume at 17:56 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
Lincoln, IL (KILX), launched 12:00Z, 6.0 hours before the alert went out and 91 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
- 1021 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 506 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 398 m²/s²
- 0-3 km storm-relative helicity
- 396 m²/s²
- Significant tornado parameter
- 2.7
- Supercell composite
- 11.0
The text
As transmitted, in the capitals the NWS used until 2016.
753
ACUS11 KWNS 171757
SWOMCD
SPC MCD 171757
INZ000-ILZ000-171930-
MESOSCALE DISCUSSION 2015
NWS STORM PREDICTION CENTER NORMAN OK
1157 AM CST SUN NOV 17 2013
AREAS AFFECTED...ERN IL...WRN IND
CONCERNING...TORNADO WATCH 561...562...
VALID 171757Z - 171930Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 561...562...CONTINUES.
SUMMARY...GREATEST NEAR-TERM SIGNIFICANT TORNADO RISK IS APPROACHING
THE I-55 AND I-57 CORRIDORS BETWEEN JOLIET AND KANKAKEE AND PERHAPS
THE SRN PORTIONS OF THE CHICAGOLAND METRO AREA.
DISCUSSION...AN INTENSE SUPERCELL OVER NWRN LIVINGSTON COUNTY IL HAS
HAD A TORNADO CYCLONE EVIDENT IN RADAR IMAGERY FOR NEARLY 50 MILES.
DOWNSTREAM ENVIRONMENT REMAINS SUPPORTIVE FOR A LONG-TRACK
SIGNIFICANT TORNADO GIVEN A SICKLE-CELL ENLARGED HODOGRAPH STRUCTURE
SAMPLED IN ILX VWP DATA AND SURFACE TEMPERATURES WARMING INTO THE
LOWER 70S IMMEDIATELY AHEAD OF THE BROKEN BAND OF SUPERCELLS.
ADDITIONAL LONG-TRACK/SIGNIFICANT TORNADOES MAY EVOLVE E/NEWD OUT OF
PERSISTENT SUPERCELLS CURRENTLY IN MCLEAN AND CHRISTIAN COUNTIES IN
CNTRL IL.
..GRAMS.. 11/17/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IWX...IND...LOT...ILX...
LAT...LON 42158783 41638684 40918652 39768683 39518758 39408852
39488899 39988899 41478854 41868812 42158783SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 16, 11:29 PM CST | Mesoscale Discussion | SPC | Alexander, Jackson, Johnson, Pulaski, Union, Williamson | 61 min |
| Nov 17, 2:06 AM CST | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more | 84 min |
| Nov 17, 7:47 AM CST | Mesoscale Discussion | SPC | Adams, Bond, Brown, Bureau, Calhoun, Carroll and 55 more | 88 min |
| Nov 17, 8:40 AM CST | Tornado Watch | SPC | Adams, Bond, Boone, Brown, Bureau, Calhoun and 77 more | 7 hr |
| Nov 17, 10:17 AM CST | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more | 118 min |
| Nov 17, 10:43 AM CST | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 8 hr |
| Nov 17, 10:49 AM CST | Mesoscale Discussion | SPC | Bond, Boone, Bureau, Calhoun, Cass, Champaign and 56 more | 86 min |
| Nov 17, 11:57 AM CST | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more | 93 min |
| Nov 17, 1:05 PM CST | Mesoscale Discussion | SPC | Alexander, Hamilton, Johnson, Massac, Pope, Pulaski and 4 more | 55 min |
| Nov 17, 1:13 PM CST | Mesoscale Discussion | SPC | Clark, Crawford, Edgar, Edwards, Jasper, Lawrence and 3 more | 77 min |
| Nov 17, 2:43 PM CST | Mesoscale Discussion | SPC | Alexander, Edwards, Gallatin, Hamilton, Hardin, Johnson and 8 more | 62 min |
| Nov 17, 10:01 AM CST | Mesoscale Discussion | SPC | Adams, Allen, Bartholomew, Benton, Blackford, Boone and 56 more | 119 min |
| Nov 17, 10:20 AM CST | Tornado Watch | SPC | Adams, Allen, Bartholomew, Blackford, Boone, Brown and 65 more | 9 hr |
| Nov 17, 1:34 PM CST | Mesoscale Discussion | SPC | Clark, Crawford, Floyd, Harrison, Perry, Washington | 56 min |
| Nov 17, 1:58 PM CST | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 6 hr |
| Nov 17, 2:51 PM CST | Mesoscale Discussion | SPC | Adams, Allen, Bartholomew, Blackford, Brown, Clay and 34 more | 84 min |
| Nov 17, 3:46 PM CST | Mesoscale Discussion | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Orange and 7 more | 89 min |
Nearby
Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Indiana, 2013Every mesoscale discussion in 2013
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.