Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 191, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Aug 31, 2018, 10:31 PM CDT for Douglas County, Wisconsin. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 31, 2018, 10:31 PM CDT (03:31 UTC)
- Expired
- Aug 31, 2018, 11:00 PM CDT
- In force
- 29 min
- Issued by
- NWS Duluth, MN
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 70.0 mph
County Douglas County, WI
The radar
The Duluth radar (KDLH), 48 km from the middle of the area, began a volume at 03:34 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 31, 6:55 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
International Fa, MN (KINL), launched 00:00Z, 3.5 hours before the alert went out and 257 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
- 424 J/kg
- Mixed-layer CIN
- -144 J/kg
- Mixed-layer LCL
- 964 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Duluth, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 31, 6:43 PM CDT, 3 hours 48 minutes earlier.
Area forecast discussion, Aug 31, 6:43 PM CDT, 3 hours 48 minutes before
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Hazardous Weather Outlook...UPDATED National Weather Service Duluth MN 249 PM CDT Fri Aug 31 2018 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-011130- Koochiching-North St. Louis-Northern Cook/Northern Lake- North Itasca-Central St. Louis-Southern Lake/North Shore- Southern Cook/North Shore-North Cass-South Itasca-South Cass- Crow Wing-Northern Aitkin-South Aitkin-Carlton/South St. Louis- Pine-Douglas-Bayfield-Ashland-Iron-Burnett-Washburn-Sawyer-Price- 249 PM CDT Fri Aug 31 2018 This Hazardous Weather Outlook is for portions of northeast Minnesota and northwest Wisconsin. .DAY ONE...This afternoon and Tonight Thunderstorms are likely this afternoon through early Saturday morning over much of the Northland. Some storms will be strong to severe with large hail, damaging wind gusts, torrential rainfall, and frequent lightning. A tornado cannot be entirely ruled out. The heavy rain could lead to flash flooding, mainly over northwest Wisconsin and adjacent counties of northeast Minnesota where soils are nearly saturated. Heavy rain has also become more likely along portions of the north shore, especially between the crest of the ridge and the lake. A Flash Flood Watch remains in effect until 7 AM Saturday and now includes the north shore and Price County Wisconsin. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Several rounds of thunderstorms are expected during the upcoming week. Repeated heavy rainfall may cause flooding. Some of storms may be severe. .SPOTTER INFORMATION STATEMENT... SKYWARN Spotters will be needed tonight. LSZ121-140>148-011130- Bayfield to Oak Point WI-Grand Portage to Grand Marais MN- Grand Marais to Taconite Harbor MN- Taconite Harbor to Silver Bay Harbor MN- Silver Bay Harbor to Two Harbors MN-Two Harbors to Duluth MN- Duluth MN to Port Wing WI-Port Wing to Sand Island WI- Sand Island to Bayfield WI-Oak Point to Saxon Harbor WI- 249 PM CDT Fri Aug 31 2018 This Hazardous Weather Outlook is for portions of the Nearshore waters of western Lake Superior. .DAY ONE...This afternoon and Tonight Thunderstorms are possible over the nearshore waters of western Lake Superior this afternoon through early Saturday morning, with some strong to severe thunderstorms possible. The main threats will be large hail and wind gusts greater than 35 knots, along with frequent lightning. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Several rounds of thunderstorms are expected from Sunday through the upcoming week. Some of the storms may be strong to severe. Huyck/DAP More information may be obtained at the following web address: http://www.weather.gov/duluth (all lower case)
In the hours before
Local storm report, Aug 31, 9:18 PM CDT, 1 hour 13 minutes before
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</html>Local storm report, Aug 31, 9:24 PM CDT, 1 hour 7 minutes before
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</html>Local storm report, Aug 31, 9:31 PM CDT, 1 hour before
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</html>Local storm report, Aug 31, 10:02 PM CDT, 29 minutes before
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</html>Special weather statement, Aug 31, 10:11 PM CDT, 20 minutes before
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</html>Local storm report, Aug 31, 10:13 PM CDT, 18 minutes before
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</html>The office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| 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, 8:07 PM CDT | Special Marine Warning | DLH | 53 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, 9:00 PM CDT | Special Marine Warning | DLH | 60 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, 9:26 PM CDT | Special Marine Warning | DLH | 64 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, 10:03 PM CDT | Special Marine Warning | DLH | 57 min | |
| Aug 31, 10:08 PM CDT | Severe Thunderstorm Warning | DLH | Cook | 52 min |
| Aug 31, 10:11 PM CDT | Special Weather Statement | DLH | Lake | 34 min |
| Aug 31, 10:49 PM CDT | Special Weather Statement | DLH | Aitkin | 26 min |
| Aug 31, 10:54 PM CDT | Special Marine Warning | DLH | 51 min | |
| Aug 31, 10:56 PM CDT | Areal Flood Advisory | DLH | Carlton, Saint Louis | 64 min |
| Aug 31, 11:31 PM CDT | Special Marine Warning | DLH | 44 min | |
| Aug 31, 11:42 PM CDT | Special Weather Statement | DLH | Carlton | 33 min |
| Sep 1, 12:14 AM CDT | Special Marine Warning | DLH | 31 min | |
| Sep 1, 12:16 AM CDT | Special Weather Statement | DLH | 44 min | |
| Sep 1, 12:42 AM CDT | Severe Thunderstorm Warning | DLH | Lake, Saint Louis | 33 min |
| Sep 1, 12:46 AM CDT | Special Marine Warning | DLH | 44 min | |
| Sep 1, 1:25 AM CDT | Special Weather Statement | DLH | Lake | 35 min |
| Sep 1, 4:18 AM CDT | Special Weather Statement | DLH | 27 min | |
| Sep 1, 4:45 AM CDT | Special Weather Statement | DLH | 30 min | |
| Sep 1, 4:46 AM CDT | Dense Fog Advisory | DLH | Aitkin, Cass, Crow Wing, Itasca, Saint Louis | 2 hr |
| Sep 1, 7:02 AM CDT | Dense Fog Advisory | DLH | Aitkin, Cass, Crow Wing, Itasca, Saint Louis | 58 min |
| Aug 31, 10:59 PM CDT | Special Weather Statement | DLH | Bayfield | 16 min |
| Aug 31, 11:15 PM CDT | Special Weather Statement | DLH | Bayfield | 45 min |
| Aug 31, 11:22 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield | 23 min |
| Aug 31, 11:36 PM CDT | Areal Flood Advisory | DLH | Bayfield, Douglas | 114 min |
| Aug 31, 11:47 PM CDT | Special Weather Statement | DLH | Ashland | 28 min |
| Sep 1, 9:11 AM CDT | Special Weather Statement | DLH | Price | 34 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2018Every severe thunderstorm warning 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.