Alert archive / Illinois / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 693
The Storm Prediction Center issued this severe thunderstorm watch at Aug 16, 1997, 5:15 PM CDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 16, 1997, 5:15 PM CDT (22:15 UTC)
- Expired
- Aug 16, 1997, 11:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 73 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, 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, Grundy 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, 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, 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, Fulton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, White County, IN, Berrien County, MI, Van Buren County, MI
The radar
The Quad Cities radar (KDVN), 74 km from the middle of the area, began a volume at 22:19 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.
Warnings issued inside it
29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 5:27 PM CDT | Tornado Warning | DVN | Jackson, Jones | 63 min |
| Aug 16, 5:58 PM CDT | Tornado Warning | DVN | Whiteside | 62 min |
| Aug 16, 6:05 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 25 min |
| Aug 16, 6:06 PM CDT | Severe Thunderstorm Warning | GRR | Van Buren | 34 min |
| Aug 16, 6:53 PM CDT | Tornado Warning | DVN | Clinton, Scott | 62 min |
| Aug 16, 7:02 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb | 28 min |
| Aug 16, 7:09 PM CDT | Tornado Warning | DVN | Rock Island | 46 min |
| Aug 16, 7:09 PM CDT | Tornado Warning | LOT | LaPorte | 36 min |
| Aug 16, 7:13 PM CDT | Severe Thunderstorm Warning | GRR | Berrien | 47 min |
| Aug 16, 7:24 PM CDT | Tornado Warning | DVN | Whiteside | 46 min |
| Aug 16, 7:29 PM CDT | Flash Flood Warning | LOT | Cook | 3 hr |
| Aug 16, 7:43 PM CDT | Tornado Warning | DVN | Scott | 32 min |
| Aug 16, 7:48 PM CDT | Severe Thunderstorm Warning | LOT | LaPorte, Saint Joseph | 42 min |
| Aug 16, 7:55 PM CDT | Tornado Warning | DVN | Rock Island | 35 min |
| Aug 16, 7:59 PM CDT | Tornado Warning | LOT | Saint Joseph | 31 min |
| Aug 16, 8:07 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, Will | 68 min |
| Aug 16, 8:07 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 68 min |
| Aug 16, 8:10 PM CDT | Tornado Warning | DVN | Whiteside | 30 min |
| Aug 16, 8:21 PM CDT | Tornado Warning | DVN | Cedar | 59 min |
| Aug 16, 8:23 PM CDT | Tornado Warning | DVN | Henry | 62 min |
| Aug 16, 8:30 PM CDT | Severe Thunderstorm Warning | ILX | Knox, Stark | 45 min |
| Aug 16, 8:35 PM CDT | Tornado Warning | DVN | Muscatine | 65 min |
| Aug 16, 9:02 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 28 min |
| Aug 16, 9:11 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 49 min |
| Aug 16, 9:15 PM CDT | Severe Thunderstorm Warning | ILX | Knox, Stark | 45 min |
| Aug 16, 9:25 PM CDT | Severe Thunderstorm Warning | DVN | Henry | 65 min |
| Aug 16, 9:28 PM CDT | Tornado Warning | DVN | Johnson, Washington | 47 min |
| Aug 16, 9:33 PM CDT | Tornado Warning | DVN | Muscatine | 62 min |
| Aug 16, 10:31 PM CDT | Flash Flood Warning | DVN | Muscatine | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 67 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
- 3426 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 756 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, DeKalb, Elkhart, Fulton and 12 more | 6 hr |
| Aug 15, 8:00 PM CDT | Tornado Watch | SPC | Alger, Dickinson, Gogebic, Iron | 6 hr |
| Aug 16, 7:15 AM CDT | Severe Thunderstorm Watch | SPC | Lenawee, Monroe, Washtenaw, Wayne | 4 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 1997Severe Thunderstorm Watches in Iowa, 1997Severe Thunderstorm Watches in Indiana, 1997Every severe thunderstorm watch in 1997
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.