Alert archive / Wisconsin / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 362
The Storm Prediction Center issued this severe thunderstorm watch at Aug 31, 2018, 6:55 PM CDT for 5 counties in Minnesota; 7 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 31, 2018, 6:55 PM CDT (23:55 UTC)
- Expired
- Sep 1, 2018, 12:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Aitkin County, MN, Carlton County, MN, Lake County, MN, Pine County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Burnett County, WI, Douglas County, WI, Iron County, WI, Sawyer County, WI, Washburn County, WI
The radar
The Duluth radar (KDLH), 13 km from the middle of the area, began a volume at 23:56 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 7:28 PM CDT | Severe Thunderstorm Warning | DLH | Aitkin, Carlton, Saint Louis | 47 min |
| Aug 31, 8:02 PM CDT | Severe Thunderstorm Warning | DLH | Carlton, Lake, Saint Louis | 43 min |
| Aug 31, 8:11 PM CDT | Severe Thunderstorm Warning | DLH | Aitkin | 34 min |
| Aug 31, 8:42 PM CDT | Severe Thunderstorm Warning | DLH | Cook, Lake, Saint Louis | 48 min |
| Aug 31, 8:47 PM CDT | Severe Thunderstorm Warning | DLH | Aitkin, Carlton, Saint Louis | 28 min |
| Aug 31, 8:56 PM CDT | Severe Thunderstorm Warning | DLH | Aitkin | 19 min |
| Aug 31, 9:18 PM CDT | Severe Thunderstorm Warning | DLH | Aitkin, Carlton | 27 min |
| Aug 31, 9:24 PM CDT | Severe Thunderstorm Warning | DLH | Cook, Lake | 51 min |
| Aug 31, 9:41 PM CDT | Severe Thunderstorm Warning | DLH | Carlton, Saint Louis | 34 min |
| Aug 31, 10:02 PM CDT | Severe Thunderstorm Warning | DLH | Carlton, Saint Louis | 28 min |
| Aug 31, 10:31 PM CDT | Severe Thunderstorm Warning | DLH | Douglas | 29 min |
| Aug 31, 11:22 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield | 23 min |
The nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 11.9 hours before the alert went out and 202 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
- 1301 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 617 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 175 m²/s²
- 0-3 km storm-relative helicity
- 306 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 2:00 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Hubbard, Itasca and 10 more | 3 hr |
| Aug 31, 2:19 PM CDT | Severe Thunderstorm Watch | SPC | Beltrami, Clearwater, Itasca, Koochiching, Lake of the Woods | 2 hr |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2018Severe Thunderstorm Watches in Minnesota, 2018Every severe thunderstorm watch in 2018
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.