Alert archive / Iowa / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 672
The Storm Prediction Center issued this severe thunderstorm watch at Aug 3, 1997, 2:15 PM CDT for 30 counties in Illinois; 33 counties in Iowa. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 1997, 2:15 PM CDT (19:15 UTC)
- Expired
- Aug 3, 1997, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 63 counties
Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Grundy County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marshall County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Brown County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, LaSalle 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, Morgan County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL
The radar
The Quad Cities radar (KDVN), 43 km from the middle of the area, began a volume at 19:18 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
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 2:30 PM CDT | Severe Thunderstorm Warning | DVN | Clinton | 65 min |
| Aug 3, 2:50 PM CDT | Severe Thunderstorm Warning | DVN | Cedar | 50 min |
| Aug 3, 2:53 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque | 62 min |
| Aug 3, 2:58 PM CDT | Tornado Warning | DVN | Clinton | 47 min |
| Aug 3, 3:20 PM CDT | Severe Thunderstorm Warning | DVN | Benton | 65 min |
| Aug 3, 3:38 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 47 min |
| Aug 3, 3:47 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island | 63 min |
| Aug 3, 3:51 PM CDT | Tornado Warning | DVN | Rock Island | 49 min |
| Aug 3, 4:01 PM CDT | Severe Thunderstorm Warning | DVN | Henry | 64 min |
| Aug 3, 4:23 PM CDT | Severe Thunderstorm Warning | ILX | Knox, Stark | 52 min |
| Aug 3, 4:47 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 48 min |
| Aug 3, 4:50 PM CDT | Tornado Warning | ILX | Knox | 65 min |
| Aug 3, 5:02 PM CDT | Severe Thunderstorm Warning | ILX | Peoria | 63 min |
| Aug 3, 5:07 PM CDT | Tornado Warning | ILX | Peoria | 53 min |
| Aug 3, 7:08 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 52 min |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 7.3 hours before the alert went out and 49 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
- 13 J/kg
- Mixed-layer CIN
- -260 J/kg
- Mixed-layer LCL
- 1867 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
Nearby
Severe Thunderstorm Watches in Iowa, 1997Severe Thunderstorm Watches in Illinois, 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.