Alert archive / Illinois / Mesoscale Discussions in 2012
Mesoscale Discussion 680
The Storm Prediction Center issued this mesoscale discussion at May 3, 2012, 3:53 PM CDT for 28 counties in Illinois. It was in force for 37 min.
The area
The outline as issued.
The facts
- Issued
- May 3, 2012, 3:53 PM CDT (20:53 UTC)
- Expired
- May 3, 2012, 4:30 PM CDT
- In force
- 37 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 28 counties
Brown County, IL, Bureau County, IL, Cass County, IL, DeWitt County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henry County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL
The radar
The Lincoln radar (KILX), 64 km from the middle of the area, began a volume at 20:51 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, 8.9 hours before the alert went out and 124 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
- 1717 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 775 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
814 ACUS11 KWNS 032054 SWOMCD SPC MCD 032053 ILZ000-IAZ000-032130- MESOSCALE DISCUSSION 0680 NWS STORM PREDICTION CENTER NORMAN OK 0353 PM CDT THU MAY 03 2012 AREAS AFFECTED...CNTRL IL CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON VALID 032053Z - 032130Z PROBABILITY OF WATCH ISSUANCE...95 PERCENT SUMMARY...TORNADO WATCH WILL BE ISSUED SHORTLY. DISCUSSION...ENVIRONMENTAL CONDITIONS HAVE BECOME FAVORABLE FOR SEVERE STORMS AND A WATCH ISSUANCE WILL BE COORDINATED BETWEEN THE SPC AND THE AFFECTED LOCAL NATIONAL WEATHER SERVICE OFFICES SHORTLY. ..DARROW.. 05/03/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LOT...ILX...LSX...DVN... LAT...LON 40339146 41618980 41218810 39708875 39219055 40339146
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 1:07 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Kane, Kendall and 5 more | 6 hr |
| May 3, 2:53 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 3 more | 67 min |
| May 3, 4:20 PM CDT | Tornado Watch | SPC | Bureau, Cass, Champaign, DeWitt, Ford, Fulton and 26 more | 8 hr |
| May 3, 6:22 PM CDT | Mesoscale Discussion | SPC | Cook, DeKalb, DuPage, Kane, Kendall, Lake and 1 more | 23 min |
| May 3, 6:41 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 5 hr |
| May 3, 6:42 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, DeWitt, Fulton, Greene and 17 more | 63 min |
Nearby
Mesoscale Discussions in Illinois, 2012Every mesoscale discussion in 2012
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.