Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 656
The Storm Prediction Center issued this mesoscale discussion at May 1, 2003, 1:19 AM CDT for 24 counties in Illinois; 4 counties in Indiana; 7 counties in Missouri. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- May 1, 2003, 1:19 AM CDT (06:19 UTC)
- Expired
- May 1, 2003, 2:45 AM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 35 counties
Adams County, IL, Brown County, IL, Cass County, IL, DeWitt County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Audrain County, MO, Boone County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO
The radar
The Lincoln radar (KILX), 80 km from the middle of the area, began a volume at 06:21 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 00:00Z, 6.3 hours before the alert went out and 142 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
- 1938 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1356 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 215 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 7.1
The text
As transmitted, in the capitals the NWS used until 2016.
196 ACUS11 KWNS 010619 SWOMCD SPC MCD 010619 INZ000-ILZ000-MOZ000-010745- MESOSCALE DISCUSSION 0656 NWS STORM PREDICTION CENTER NORMAN OK 0119 AM CDT THU MAY 01 2003 AREAS AFFECTED...NERN MO...NRN-CNTRL IL...NWRN IND CONCERNING...SEVERE THUNDERSTORM WATCH 193... VALID 010619Z - 010745Z SERIES OF STRONG OUTFLOW BOUNDARIES CONTINUE MOVING ESEWD ACROSS ERN PORTIONS OF WW 193 ATTM...FROM COMMA-HEAD LOW OVER SRN LAKE MICHIGAN SWWD INTO CNTRL IL...WITH ANOTHER OUTFLOW EXTENDING FROM MESOLOW OVER WRN TO A STRONG CELL NOW MOVING INTO SHELBY AND MONROE COUNTIES OF ERN MO. AIRMASS FEEDING INTO AREAS OF STRONG LOW LEVEL CONVERGENCE ALONG AND NORTH OF THE OUTFLOWS REMAINS UNSTABLE WITH AN AXIS OF MLCAPE AROUND 1000 J/KG SITUATED FROM THE MS RIVER NEWD INTO NRN IND. WHILE ISOLD CELLS COULD STILL POSE A HAIL/WIND THREAT...ACTIVITY WILL CONTINUE TO MOVE SOUTH OF THE STRONGER MIDLEVEL FLOW...AND DIURNAL COOLING WILL RESULT IN A SLOW DECREASE IN INSTABILITY. THEREFORE...EXPECT CONVECTIVE INTENSITY ACROSS MUCH OF WW 193 TO CONTINUE TO WANE. THIS SCENARIO IS ALSO SUPPORTED BY LATEST SHORT-TERM MODEL GUIDANCE. ..CARBIN.. 05/01/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...IWX...IND...LOT...ILX...LSX...DVN...EAX... 39809231 40009124 40828954 41348917 41658714 40658701 39539008 38999153 38759243
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 7:31 PM CDT | Mesoscale Discussion | SPC | Adams, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more | 119 min |
| Apr 30, 10:31 PM CDT | Mesoscale Discussion | SPC | Adams, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more | 89 min |
| Apr 30, 10:55 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Cass, DeWitt, Ford, Fulton and 22 more | 5 hr |
| May 1, 7:51 AM CDT | Mesoscale Discussion | SPC | Alexander, Crawford, Edwards, Franklin, Gallatin, Hamilton and 14 more | 114 min |
| May 1, 9:35 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 9 more | 5 hr |
| May 1, 12:15 PM CDT | Severe Thunderstorm Watch | SPC | Gallatin, Hardin | 5 hr |
| May 1, 12:09 PM CDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 26 more | 3 hr |
| May 1, 12:50 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bartholomew, Blackford, Boone, Brown, Clay and 43 more | 5 hr |
| May 1, 3:10 PM CDT | Mesoscale Discussion | SPC | Adams, Bartholomew, Blackford, Boone, Brown, Clay and 35 more | 95 min |
| Apr 30, 9:22 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Camden, Cass, Cedar and 19 more | 83 min |
| Apr 30, 9:30 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Camden, Carroll, Cass and 25 more | 6 hr |
| May 1, 12:00 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Camden, Carroll, Cass and 24 more | 90 min |
| May 1, 2:27 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cedar and 17 more | 2 hr |
Nearby
Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Missouri, 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.