Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 2413
The Storm Prediction Center issued this mesoscale discussion at Sep 26, 2003, 6:59 PM CDT for 23 counties in Illinois; 14 counties in Indiana. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Sep 26, 2003, 6:59 PM CDT (23:59 UTC)
- Expired
- Sep 26, 2003, 8:30 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 37 counties
Bond County, IL, 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, Jasper County, IL, Logan County, IL, Macon County, IL, Menard County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Shelby County, IL, Vermilion County, IL, Boone County, IN, Clay County, IN, Fountain County, IN, Greene County, IN, Hendricks County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Vermillion County, IN, Vigo County, IN
The radar
The Lincoln radar (KILX), 118 km from the middle of the area, began a volume at 00:03 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, 12.0 hours before the alert went out and 83 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
- 2018 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 246 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
424 ACUS11 KWNS 262359 SWOMCD SPC MCD 262359 INZ000-ILZ000-270130- MESOSCALE DISCUSSION 2413 NWS STORM PREDICTION CENTER NORMAN OK 0659 PM CDT FRI SEP 26 2003 AREAS AFFECTED...CNTRL AND ERN IL INTO WRN IND CONCERNING...TORNADO WATCH 930... VALID 262359Z - 270130Z THE THREAT OF ISOLATED TORNADOES WILL CONTINUE ACROSS CNTRL AND SRN PORTIONS OF WW AREA THROUGH 01 OR 02Z. 23Z MESOANALYSIS INDICATED A SURFACE LOW NEAR MTO WITH AN ATTENDANT WARM FRONT THAT EXTENDED SEWD INTO SRN IND /N OF SDF/. ASSOCIATED COLD FRONT THEN STRETCHED NWD FROM THE LOW THROUGH THE CHI METRO AREA WITH THE TRAILING PORTION OF THIS FEATURE EXTENDING SWWD THROUGH CNTRL MO. LOCALIZED PRESSURE FALL CENTER / I.E. 3-4MB/3HRS / HAS NOW MOVED EWD INTO CNTRL IL WHICH SUGGESTS THAT WARM FRONT SHOULD CONTINUE TO LIFT NWD ACROSS SRN IND. THE GREATEST TORNADO THREAT FOR THE NEXT HOUR OR SO WILL EXIST FROM NEAR THE SURFACE LOW CENTER OVER W-CNTRL IND SWD AND EVENTUALLY SEWD AS ONGOING CONVECTIVE LINE BEGINS TO INTERACT WITH RETREATING WARM FRONT. HERE LOW-LEVEL WIND FIELDS REMAIN VERY FAVORABLE WITH 0-1KM SHEAR/SRH VALUES OF 20-25KTS AND 150-250 M2/S2...RESPECTIVELY. ..MEAD.. 09/26/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...IND...ILX...LSX... 38828988 40078991 40288960 40348668 40118635 39008634 38808664 38668961
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 26, 12:21 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Christian, DeWitt and 23 more | 114 min |
| Sep 26, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Bureau, Calhoun, Cass and 26 more | 6 hr |
| Sep 26, 4:32 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 19 more | 88 min |
| Sep 26, 4:50 PM CDT | Tornado Watch | SPC | Bond, Champaign, Christian, Clark, Clay, Coles and 18 more | 5 hr |
| Sep 26, 5:06 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Bureau, Calhoun, Cass and 26 more | 84 min |
| Sep 26, 6:10 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 hr |
| Sep 26, 5:45 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Blackford, Brown, Dearborn, Decatur, Delaware and 22 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.