Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 2049
The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2003, 5:49 PM CDT for 35 counties in Illinois; 5 counties in Iowa. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2003, 5:49 PM CDT (22:49 UTC)
- Expired
- Aug 1, 2003, 7:15 PM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 40 counties
Des Moines County, IA, Henry County, IA, Lee County, IA, Louisa County, IA, Scott County, IA, Boone County, IL, Brown County, IL, Bureau County, IL, Cass County, IL, DeKalb County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL
The radar
The Lincoln radar (KILX), 87 km from the middle of the area, began a volume at 22:52 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, 10.8 hours before the alert went out and 103 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
- 1279 J/kg
- Mixed-layer CIN
- -100 J/kg
- Mixed-layer LCL
- 1232 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
994 ACUS11 KWNS 012249 SWOMCD SPC MCD 012249 ILZ000-IAZ000-020015- MESOSCALE DISCUSSION 2049 NWS STORM PREDICTION CENTER NORMAN OK 0549 PM CDT FRI AUG 01 2003 AREAS AFFECTED...FAR SERN IA/WRN AND NRN IL CONCERNING...SEVERE THUNDERSTORM WATCH 824... VALID 012249Z - 020015Z CLUSTER OF STRONG CONVECTION OVER THE ERN PORTION OF WW 824 WILL HAVE THE POTENTIAL FOR WIND DAMAGE AND/OR LARGE HAIL OVER THE NEXT FEW HOURS. ANALYSIS SHOWS A SFC LOW OVER LOWER MI AND A TRAILING WEAK COLD FRONT ACROSS NRN IND AND NCNTRL IL. CONVECTION IS ONGOING ACROSS NRN IL ALONG A BAND OF STRONG LOW-LEVEL CONVERGENCE EXTENDING SEWD INTO CNTRL IND. THE LOW-LEVEL CONVERGENCE AND STRONG LARGE-SCALE LIFT AHEAD OF SHORTWAVE TROUGH ACROSS WRN IL WILL HELP THE CONVECTION TO REMAIN INTENSE OVER THE NEXT FEW HOURS. IN ADDITION...THE VERY UNSTABLE AIR AHEAD THE CONVECTION WILL HELP SUSTAIN THE CONVECTION AS IT MOVES ACROSS THE ERN PORTION OF WW 824. NEW CELLS DEVELOPING ACROSS SERN IA WILL LIKELY MOVE INTO THE FAR WRN PORTION OF WW 824. THE STRONG INSTABILITY AND 30 KT OF DEEP LAYER SHEAR ACROSS THE REGION WILL ENHANCE THE POTENTIAL FOR LARGE HAIL AND/OR DAMAGING WINDS. ..BROYLES.. 08/01/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LOT...ILX...LSX...DVN... 39589063 40169133 40989176 41749051 42428892 41838812 40988771 40098931
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 8:19 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Jo Daviess, Ogle, Stephenson, Winnebago | 116 min |
| Aug 1, 10:59 AM CDT | Mesoscale Discussion | SPC | Bureau, DeKalb, Ford, Fulton, Grundy, Henderson and 20 more | 2 hr |
| Aug 1, 2:00 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Boone, Brown, Bureau, Cass, DeKalb and 35 more | 6 hr |
| Aug 1, 2:58 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more | 2 hr |
| Aug 1, 3:20 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more | 6 hr |
| Jul 31, 11:14 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 13 more | 2 hr |
Nearby
Mesoscale Discussions in Illinois, 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.