Alert archive / Indiana / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 627
The Storm Prediction Center issued this severe thunderstorm watch at Jul 18, 1997, 1:45 PM CDT for 10 counties in Illinois; 29 counties in Indiana; Berrien County, Cass County, Michigan. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 1997, 1:45 PM CDT (18:45 UTC)
- Expired
- Jul 18, 1997, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 41 counties
Cook County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, McHenry County, IL, Will County, IL, Allen County, IN, Blackford County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Delaware County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Berrien County, MI, Cass County, MI
The radar
The Chicago radar (KLOT), 82 km from the middle of the area, began a volume at 18:46 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
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 2:19 PM CDT | Flash Flood Warning | LOT | Lake | 41 min |
| Jul 18, 2:19 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 41 min |
| Jul 18, 2:39 PM CDT | Severe Thunderstorm Warning | LOT | Lake, McHenry | 66 min |
| Jul 18, 2:42 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 48 min |
| Jul 18, 2:52 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 53 min |
| Jul 18, 3:01 PM CDT | Severe Thunderstorm Warning | LOT | Fulton, Kosciusko, Marshall | 59 min |
| Jul 18, 3:07 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee, Will | 68 min |
| Jul 18, 3:29 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane, Kendall | 61 min |
| Jul 18, 3:32 PM CDT | Severe Thunderstorm Warning | IND | Miami | 43 min |
| Jul 18, 3:37 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 68 min |
| Jul 18, 3:57 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Will | 63 min |
| Jul 18, 4:00 PM CDT | Severe Thunderstorm Warning | IND | Cass | 45 min |
| Jul 18, 4:07 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 68 min |
| Jul 18, 4:27 PM CDT | Severe Thunderstorm Warning | LOT | Jasper, Newton, Porter | 63 min |
| Jul 18, 4:58 PM CDT | Severe Thunderstorm Warning | LOT | Pulaski, White | 62 min |
| Jul 18, 5:35 PM CDT | Severe Thunderstorm Warning | IND | Carroll | 40 min |
| Jul 18, 6:14 PM CDT | Severe Thunderstorm Warning | IND | Howard | 46 min |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 6.8 hours before the alert went out and 207 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
- 2335 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 952 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.8
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 |
|---|---|---|---|---|
| Jul 18, 10:30 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Carroll, DeKalb, Jo Daviess, Lee, McHenry and 4 more | 6 hr |
| Jul 18, 5:00 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Clark, Coles, Douglas, Edgar, Ford and 2 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Indiana, 1997Severe Thunderstorm Watches in Illinois, 1997Severe Thunderstorm Watches in Michigan, 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.