Alert archive / Illinois / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 647
The Storm Prediction Center issued this severe thunderstorm watch at Jul 16, 2004, 12:10 PM CDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 16, 2004, 12:10 PM CDT (17:10 UTC)
- Expired
- Jul 16, 2004, 5:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 86 counties
Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Elkhart County, IN, Fulton County, IN, Howard County, IN, Jasper County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Warren County, IN, White County, IN, Berrien County, MI, Cass County, MI, Van Buren County, MI, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 80 km from the middle of the area, began a volume at 17:12 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.
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 1:37 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Jones | 53 min |
| Jul 16, 1:53 PM CDT | Severe Thunderstorm Warning | IWX | Kosciusko | 22 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 5.2 hours before the alert went out and 74 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
- 227 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 1048 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 10:51 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 22 more | 2 hr |
| Jul 16, 2:45 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more | 90 min |
| Jul 15, 11:34 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Cass, Decatur, Fremont and 10 more | 86 min |
| Jul 15, 8:01 PM CDT | Mesoscale Discussion | SPC | Barry, Jasper, McDonald, Newton | 119 min |
| Jul 16, 3:33 AM CDT | Mesoscale Discussion | SPC | Andrew, Barton, Bates, Benton, Buchanan, Cass and 19 more | 117 min |
| Jul 16, 3:45 AM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 27 more | 5 hr |
| Jul 16, 6:28 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Camden, Cedar, Christian and 18 more | 92 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2004Severe Thunderstorm Watches in Indiana, 2004Severe Thunderstorm Watches in Iowa, 2004Every severe thunderstorm watch in 2004
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.