Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 377
The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2003, 3:10 PM CST for 31 counties in Illinois; 29 counties in Indiana. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2003, 3:10 PM CST (21:10 UTC)
- Expired
- Apr 4, 2003, 5:15 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 60 counties
Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Greene County, IL, Iroquois County, IL, Jasper County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Delaware County, IN, Fountain County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN
The radar
The Lincoln radar (KILX), 94 km from the middle of the area, began a volume at 21:13 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, 9.2 hours before the alert went out and 38 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
- 60 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 622 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
715 ACUS11 KWNS 042110 SWOMCD SPC MCD 042110 INZ000-ILZ000-MOZ000-042315- MESOSCALE DISCUSSION 0377 NWS STORM PREDICTION CENTER NORMAN OK 0310 PM CST FRI APR 04 2003 AREAS AFFECTED...ECNTRL MO...CNTRL/SRN IL AND CNTRL IND CONCERNING...TORNADO WATCH 85...86... VALID 042110Z - 042315Z ...TORNADO THREAT INCREASING ACROSS THE AREA... SEVERAL DISCRETE SUPERCELLS CONTINUE TO MOVE ENEWD ACROSS THE MS RVR NEAR STL INTO CNTRL/SRN IL WHILE POTENTIALLY TORNADIC SUPERCELLS MOVE ACROSS CNTRL IL. LATEST MESOANALYSIS HAS SHOWN A TREND IN BACKING AND INCREASING LOW LEVEL FLOW ACROSS CNTRL IL INVOF OF A WARM FRONT AND RECENT VWP FROM ILX SHOWS A RATHER LONG AND LOOPY HODOGRAPH WITH LOW LEVEL SRH HAVING INCREASED TO ABOVE 160 M2/S2. AIR MASS DOWNSTREAM CONTINUES TO BE SUPPORTIVE OF TSTMS...AND GIVEN INCREASINGLY FAVORABLE KINEMATICS...SUPERCELLS WITH VERY LARGE HAIL...TORNADOES AND DAMAGING WIND GUSTS WILL CONTINUE TO DEVELOP. THESE CELLS WILL BECOME ESPECIALLY CAPABLE OF TORNADOES AS THEY MOVE NWD INTO BAROCLINIC ZONE SITUATED FROM CMI-DNV-MIE. ..RACY.. 04/04/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILN...IWX...IND...LOT...ILX...LSX... 39389078 40338990 40798883 40918692 40748531 39998501 39228701 38548995
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 7:23 AM CST | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Champaign and 55 more | 97 min |
| Apr 4, 9:47 AM CST | Mesoscale Discussion | SPC | Clark, Coles, Crawford, Cumberland, Douglas, Edgar and 9 more | 58 min |
| Apr 4, 11:10 AM CST | Mesoscale Discussion | SPC | Bond, Calhoun, Cass, Champaign, Christian, Clinton and 24 more | 95 min |
| Apr 4, 12:05 PM CST | Tornado Watch | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 10 more | 5 hr |
| Apr 4, 1:12 PM CST | Mesoscale Discussion | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 35 more | 93 min |
| Apr 4, 1:29 PM CST | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Grundy, Kane and 8 more | 91 min |
| Apr 4, 2:35 PM CST | Tornado Watch | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 26 more | 5 hr |
| Apr 4, 4:25 PM CST | Tornado Watch | SPC | Alexander, Bond, Clay, Clinton, Edwards, Franklin and 24 more | 6 hr |
| Apr 4, 5:11 PM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 24 more | 2 hr |
Nearby
Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Indiana, 2003Every mesoscale discussion in 2003
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.