Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 928
The Storm Prediction Center issued this mesoscale discussion at May 10, 2003, 8:18 PM CDT for 14 counties in Illinois; 14 counties in Iowa; 7 counties in Wisconsin. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- May 10, 2003, 8:18 PM CDT (01:18 UTC)
- Expired
- May 10, 2003, 10:15 PM CDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
All 35 counties
Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Bureau County, IL, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI
The radar
The Quad Cities radar (KDVN), 46 km from the middle of the area, began a volume at 01:19 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
Davenport, (KDVN), launched 00:00Z, 1.3 hours before the alert went out and 41 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
- 1566 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 910 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 234 m²/s²
- 0-3 km storm-relative helicity
- 259 m²/s²
- Significant tornado parameter
- 2.8
- Supercell composite
- 12.7
The text
As transmitted, in the capitals the NWS used until 2016.
414 ACUS11 KWNS 110119 SWOMCD SPC MCD 110118 WIZ000-ILZ000-IAZ000-110315- MESOSCALE DISCUSSION 0928 NWS STORM PREDICTION CENTER NORMAN OK 0818 PM CDT SAT MAY 10 2003 AREAS AFFECTED...ERN IA THROUGH SRN/CNTRL WI CONCERNING...TORNADO WATCH 346...347... VALID 110118Z - 110315Z TORNADO THREAT IS EXPECTED TO REMAIN HIGH ESPECIALLY ACROSS PARTS OF ERN IA NRN IL AND SRN WI NEXT FEW HOURS AS SUPERCELLS CONTINUE DEVELOPING NEWD. SURFACE LOW CONTINUES TO DEEPEN ACROSS ERN IA WITH PRESSURE FALLS FROM ERN IA THROUGH SRN WI AND NWRN IL. LOW LEVEL FLOW CONTINUES TO STRENGTHEN AND THE ATMOSPHERE IS DESTABILIZING NWD WITH TIME ALONG AND S OF THE WARM FRONT THAT EXTENDS EWD FROM THE LOW THROUGH SRN WI. IN RESPONSE TO THE DEEPENING SURFACE LOW...THE BOUNDARY LAYER FLOW HAS ACCELERATED AND BACKED...RESULTING IN VERY FAVORABLE HODOGRAPHS FOR TORNADIC SUPERCELLS. ..DIAL.. 05/11/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LOT...ILX...MKX...DVN...ARX... 40618957 40759165 42789184 43529041 43168923 42058928
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 7:06 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Hardin, Jackson, Johnson, Massac and 7 more | 54 min |
| May 10, 8:05 PM CDT | Tornado Watch | SPC | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 6 hr |
| May 10, 8:41 PM CDT | Mesoscale Discussion | SPC | Crawford, Lawrence, Richland, Wabash | 2 hr |
| May 10, 8:45 PM CDT | Tornado Watch | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more | 5 hr |
| May 10, 9:10 PM CDT | Tornado Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Champaign and 45 more | 5 hr |
| May 10, 9:35 PM CDT | Tornado Watch | SPC | Bureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 11 more | 3 hr |
| May 10, 10:56 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 19 more | 94 min |
| May 11, 1:46 AM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Champaign and 42 more | 89 min |
Nearby
Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Wisconsin, 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.