Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 1721
The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 6:46 PM CDT for 20 counties in Illinois; 8 counties in Iowa; 15 counties in Missouri. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2003, 6:46 PM CDT (23:46 UTC)
- Expired
- Jul 8, 2003, 9:45 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 43 counties
Appanoose County, IA, Davis County, IA, Decatur County, IA, Lee County, IA, Ringgold County, IA, Taylor County, IA, Van Buren County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Cass County, IL, Champaign County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Fulton County, IL, Hancock County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Schuyler County, IL, Tazewell County, IL, Adair County, MO, Clark County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO
The radar
The Quad Cities radar (KDVN), 182 km from the middle of the area, began a volume at 23:50 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
Davenport, (KDVN), launched 12:00Z, 11.8 hours before the alert went out and 186 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
- 823 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 796 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
381 ACUS11 KWNS 082346 SWOMCD SPC MCD 082346 ILZ000-IAZ000-MOZ000-090245- MESOSCALE DISCUSSION 1721 NWS STORM PREDICTION CENTER NORMAN OK 0646 PM CDT TUE JUL 08 2003 AREAS AFFECTED...IA/MO BORDER REGION...PORTIONS NERN MO...CENTRAL IL CONCERNING...HEAVY RAINFALL VALID 082346Z - 090245Z HEAVY RAIN RATES -- COMMONLY 1.5-2.5 INCHES/HOUR BUT LOCALLY OVER 3 INCHES/HOUR -- WILL AFFECT MUCH OF CORRIDOR FROM NODAWAY/ANDREW COUNTIES MO EWD TOWARD DAVIS COUNTY IA AND SCOTLAND COUNTY MO...THEN ESEWD ACROSS IL TOWARD CMI AREA. THIS INCLUDES IRK...UIN...SPI AND EWD ALONG I-72 TO NEAR INDIANA BORDER. TRAINING/MERGING OF CELLS WILL ENHANCE HAZARD. THIS INCLUDES ADDITIONAL HEAVY RAIN PRODUCING TSTMS THAT ARE FCST TO MOVE IN SERIES...ACROSS AREAS OF NERN MO ALREADY UNDER FLASH FLOOD WARNINGS FROM PRIOR AND CURRENT ACTIVITY. SFC ANALYSIS SHOWS OUTFLOW-MODIFIED...QUASISTATIONARY BAROCLINIC ZONE FROM SWRN IA ESEWD ACROSS IRK AREA TO NEAR MTO. MOST CONVECTION WILL REMAIN ALONG AND N OF THIS BOUNDARY EXCEPT OVER NWRN MO. EXPECT ALREADY FAVORABLE SR INFLOW TO CONTINUE AND PERHAPS INCREASE OVER NEXT FEW HOURS AS BOUNDARY LAYER DECOUPLES... FOCUSING MOIST 30-35 KT LLJ INTO REGION. INFLOW-LAYER AIR MASS WILL BE CHARACTERIZED BY ROUGHLY 1.76 INCH PW AND 13-16 G/KG MEAN MIXING RATIO...ALONG WITH MUCAPE 2000-3000 J/KG...FAVORING PROFUSE PRECIP PRODUCTION. REF SPC WW 687 FOR SEVERE TSTM POTENTIAL. ..EDWARDS.. 07/08/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILX...LSX...DVN...DMX...EAX...OAX... 40079493 40329515 40659513 41009436 41029338 40658966 40298810 39848762 39688768 39558934
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 7:16 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, DuPage, Henry and 9 more | 3 hr |
| Jul 7, 7:40 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more | 3 hr |
| Jul 7, 10:18 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 21 more | 57 min |
| Jul 7, 11:00 PM CDT | Severe Thunderstorm Watch | SPC | Cook, Iroquois, Kankakee, Lake, Vermilion | 5 hr |
| Jul 7, 11:50 PM CDT | Mesoscale Discussion | SPC | Iroquois, Vermilion | 85 min |
| Jul 8, 8:50 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Hancock, Henderson, McDonough, Mercer and 2 more | 115 min |
| Jul 8, 9:50 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more | 5 hr |
| Jul 8, 12:25 PM CDT | Mesoscale Discussion | SPC | Clark, Clay, Crawford, Cumberland, Edwards, Effingham and 4 more | 95 min |
| Jul 8, 12:59 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more | 91 min |
| Jul 8, 1:21 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Champaign, Christian and 25 more | 24 min |
| Jul 8, 1:45 PM CDT | Tornado Watch | SPC | Adams, Brown, Bureau, Carroll, Cass, Champaign and 48 more | 5 hr |
| Jul 8, 3:40 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Cass, Champaign, Christian and 41 more | 95 min |
| Jul 8, 6:15 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 37 more | 5 hr |
| Jul 7, 10:15 PM CDT | Mesoscale Discussion | SPC | Crawford, Harrison, Ida, Monona, Plymouth, Pottawattamie and 1 more | 3 hr |
| Jul 7, 10:20 PM CDT | Severe Thunderstorm Watch | SPC | Cherokee, Crawford, Fremont, Harrison, Ida, Mills and 4 more | 7 hr |
| Jul 7, 11:25 PM CDT | Mesoscale Discussion | SPC | Clay, Dickinson, Emmet, Kossuth, Lyon, O'Brien and 3 more | 2 hr |
| Jul 7, 11:40 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 5 hr |
| Jul 8, 1:34 AM CDT | Mesoscale Discussion | SPC | Cherokee, Crawford, Fremont, Harrison, Ida, Mills and 5 more | 116 min |
| Jul 8, 2:52 AM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 49 more | 113 min |
| Jul 8, 5:13 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 19 more | 92 min |
Nearby
Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Missouri, 2003Mesoscale Discussions in Iowa, 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.