Alert archive / Minnesota / Severe Thunderstorm Watches in 1998
Severe Thunderstorm Watch 366
The Storm Prediction Center issued this severe thunderstorm watch at May 18, 1998, 5:45 PM CDT for 11 counties in Minnesota; Ashland County, Bayfield County, Douglas County, Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 18, 1998, 5:45 PM CDT (22:45 UTC)
- Expired
- May 18, 1998, 11:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Aitkin County, MN, Beltrami County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Hubbard County, MN, Itasca County, MN, Koochiching County, MN, Lake County, MN, Saint Louis County, MN, Wadena County, MN, Ashland County, WI, Bayfield County, WI, Douglas County, WI
The radar
The Duluth radar (KDLH), 135 km from the middle of the area, began a volume at 22:46 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
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 5:51 PM CDT | Tornado Warning | DLH | Itasca, Koochiching | 44 min |
| May 18, 7:10 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching, Saint Louis | 60 min |
| May 18, 7:36 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching | 64 min |
| May 18, 8:17 PM CDT | Severe Thunderstorm Warning | DLH | Itasca | 63 min |
| May 18, 8:27 PM CDT | Severe Thunderstorm Warning | DLH | Aitkin, Cass | 63 min |
| May 18, 8:44 PM CDT | Tornado Warning | DLH | Itasca | 51 min |
| May 18, 8:51 PM CDT | Severe Thunderstorm Warning | DLH | Itasca | 64 min |
| May 18, 9:30 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching | 60 min |
| May 18, 9:35 PM CDT | Severe Thunderstorm Warning | DLH | Saint Louis | 60 min |
| May 18, 9:44 PM CDT | Severe Thunderstorm Warning | DLH | Cass, Itasca | 61 min |
| May 18, 10:00 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching | 60 min |
| May 18, 10:05 PM CDT | Severe Thunderstorm Warning | DLH | Aitkin | 65 min |
| May 18, 10:33 PM CDT | Severe Thunderstorm Warning | DLH | Saint Louis | 62 min |
| May 18, 10:42 PM CDT | Tornado Warning | DLH | Itasca | 48 min |
The nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 10.8 hours before the alert went out and 91 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
- 102 J/kg
- Mixed-layer CIN
- -426 J/kg
- Mixed-layer LCL
- 1148 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 |
|---|---|---|---|---|
| May 17, 9:45 PM CDT | Severe Thunderstorm Watch | SPC | Kittson, Mahnomen, Marshall, Norman, Pennington, Polk and 2 more | 5 hr |
| May 18, 4:30 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 48 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Minnesota, 1998Severe Thunderstorm Watches in Wisconsin, 1998Every severe thunderstorm watch in 1998
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.