Alert archive / Illinois / Mesoscale Discussions in 2008
Mesoscale Discussion 621
The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2008, 11:16 AM CDT for 31 counties in Illinois; 16 counties in Indiana; Cape Girardeau County, Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 10, 2008, 11:16 AM CDT (16:16 UTC)
- Expired
- Apr 10, 2008, 1:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 48 counties
Champaign County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Richland County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Benton County, IN, Boone County, IN, Carroll County, IN, Clay County, IN, Clinton County, IN, Fountain County, IN, Howard County, IN, Montgomery County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN, Cape Girardeau County, MO
The radar
The Evansville,IN radar (KVWX), 111 km from the middle of the area, began a volume at 16:17 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, 4.3 hours before the alert went out and 112 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
- 451 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 101617 SWOMCD SPC MCD 101616 INZ000-ILZ000-MOZ000-101845- MESOSCALE DISCUSSION 0621 NWS STORM PREDICTION CENTER NORMAN OK 1116 AM CDT THU APR 10 2008 AREAS AFFECTED...PORTIONS EXTREME SERN MO...SRN/ERN IL...WRN INDIANA. CONCERNING...HEAVY RAINFALL VALID 101616Z - 101845Z BAND OF TSTMS -- MOVING NEWD 40-50 KT ACROSS PORTIONS SRN IL AND SERN MO AS OF 16Z -- IS EXPECTED TO MOVE NEWD ACROSS REMAINDER DISCUSSION AREA DURING NEXT 2-3 HOURS. ALTHOUGH SVR POTENTIAL SHOULD CONTINUE TO DIMINISH AS THIS ACTIVITY MOVES OVER RELATIVELY STABLE SFC AIR MASS...MOISTURE/LIFT/INSTABILITY ABOVE SFC WILL FAVOR CONTINUING HEAVY RAIN. RATES 1-2 INCHES/HOUR SHOULD BE COMMON AS THIS ACTIVITY MOVES OVERHEAD. VWP/PROFILER DATA SHOWS STRENGTHENING/50-70 KT LLJ ACROSS THIS REGION...WHICH HAS BEEN INTENSIFYING IN RESPONSE TO NWD EJECTION OF OCCLUDING DEEP-LAYER CYCLONE IN CENTRAL PLAINS. STRONGEST FLOW ABOVE BOUNDARY LAYER LIKEWISE WILL CONTINUE TO SHIFT NEWD ACROSS LOWER OH VALLEY AND INDIANA...ACCOMPANIED BY STG MOIST ADVECTION...ISENTROPIC LIFT AND MOISTURE TRANSPORT. GPS PW...MODIFIED RAOBS AND MODEL SOUNDINGS INDICATE AROUND 1.5 INCH PW ALREADY PRESENT IN PRE-STORM ENVIRONMENT. RUC FCST SOUNDINGS INDICATE BUOYANCY WILL BE INCREASINGLY ELEVATED ABOVE SFC WITH NEWD EXTENT...BUT STILL FAVORABLE FOR TSTM -- WITH MUCAPE VALUES INCREASING TO 250-500 J/KG NEAR IL/INDIANA BORDER DURING 18-19Z TIME FRAME. ..EDWARDS.. 04/10/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...IWX...IND...PAH...LOT...ILX...LSX... 38858892 39418887 40158866 40768771 40848683 40588604 39208709 37838806 37268922 37318995
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 3:28 AM CDT | Tornado Watch | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 7 hr |
| Apr 10, 9:27 AM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 6 more | 2 hr |
| Apr 10, 9:51 AM CDT | Tornado Watch | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more | 7 hr |
| Apr 10, 10:51 AM CDT | Mesoscale Discussion | SPC | Alexander, Johnson, Massac, Pope, Pulaski, Union | 84 min |
| Apr 10, 1:41 PM CDT | Mesoscale Discussion | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 2 hr |
| Apr 10, 4:55 PM CDT | Tornado Watch | SPC | Adams, Brown, Calhoun, Hancock, Henderson, McDonough and 3 more | 5 hr |
| Apr 10, 5:03 PM CDT | Tornado Watch | SPC | Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 12 more | 6 hr |
| Apr 10, 6:44 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Hancock, Henderson, McDonough and 5 more | 61 min |
| Apr 10, 3:00 AM CDT | Mesoscale Discussion | SPC | Dunklin, Mississippi, New Madrid, Pemiscot | 60 min |
| Apr 10, 6:56 AM CDT | Mesoscale Discussion | SPC | Christian, Douglas, Greene, Howell, Laclede, Maries and 9 more | 64 min |
| Apr 10, 7:44 AM CDT | Tornado Watch | SPC | Dent, Douglas, Howell, Oregon, Ozark, Shannon and 2 more | 2 hr |
| Apr 10, 2:03 PM CDT | Mesoscale Discussion | SPC | Andrew, Barton, Bates, Benton, Buchanan, Caldwell and 21 more | 117 min |
| Apr 10, 2:28 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Andrew, Atchison, Barton, Bates, Benton and 51 more | 7 hr |
Nearby
Mesoscale Discussions in Illinois, 2008Mesoscale Discussions in Indiana, 2008Mesoscale Discussions in Missouri, 2008Every mesoscale discussion in 2008
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.