Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 173, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Aug 27, 2018, 7:42 PM CDT for 4 counties in Wisconsin. It was in force for 48 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 27, 2018, 7:42 PM CDT (00:42 UTC)
- Expired
- Aug 27, 2018, 8:30 PM CDT
- In force
- 48 min
- Issued by
- NWS Duluth, MN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Ashland County, WI, Bayfield County, WI, Sawyer County, WI, Washburn County, WI
The radar
The Duluth radar (KDLH), 102 km from the middle of the area, began a volume at 00:45 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 27, 2:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.7 hours before the alert went out and 241 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
- 750 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 879 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- -130 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- -0.2
- Supercell composite
- -2.6
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 27, 6:47 PM CDT, 55 minutes earlier.
Area forecast discussion, Aug 27, 6:47 PM CDT, 55 minutes before
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</html>Hazardous weather outlook, Aug 27, 3:28 PM CDT, 4 hours 14 minutes before
Hazardous Weather Outlook National Weather Service Duluth MN 328 PM CDT Mon Aug 27 2018 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-281130- 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- 328 PM CDT Mon Aug 27 2018 This Hazardous Weather Outlook is for portions of northeast Minnesota and northwest Wisconsin. .DAY ONE...This afternoon and Tonight Severe thunderstorms will occur over Pine and Carlton counties, as well as all of northwest Wisconsin tonight. Large hail, damaging winds and heavy rain are the hazards. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms will be possible Thursday night through Saturday morning. .SPOTTER INFORMATION STATEMENT... Skywarn Spotters are needed until 10 pm in Pine and Carlton counties, as well as all of northwest Wisconsin tonight. LSZ121-140>148-281130- 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- 328 PM CDT Mon Aug 27 2018 This Hazardous Weather Outlook is for portions of the Nearshore waters of western Lake Superior. .DAY ONE...This afternoon and Tonight Strong to severe thunderstorms will impact much of western Lake Superior this afternoon through this evening, especially at the head of the lake and along the South Shore, including the Apostle Islands National Lakeshore. The main threats will be strong winds, large hail, and frequent lightning. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Increasing northeast winds will lead to building waves across much of western Lake Superior on Tuesday. GSF/JTS 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 27, 6:18 PM CDT, 1 hour 24 minutes before
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</html>Local storm report, Aug 27, 6:38 PM CDT, 1 hour 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
638 PM CDT MON AUG 27 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0555 PM TSTM WND DMG 1 WNW HURLEY 46.45N 90.19W
08/27/2018 IRON WI 911 CALL CENTER
A FEW TREES KNOCKED DOWN INTO BUSINESS
PARKING LOTS ALONG 10TH AVENUE NORTH. TIME
ESTIMATED FROM RADAR.
&&
WLLocal storm report, Aug 27, 6:40 PM CDT, 1 hour 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
640 PM CDT MON AUG 27 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0550 PM TSTM WND DMG MONTREAL 46.43N 90.24W
08/27/2018 IRON WI 911 CALL CENTER
SEVERAL TREES KNOCKED DOWN ALONG HIGHWAY 77
IN MONTREAL. TIME ESTIMATED BY RADAR.
&&
WLLocal storm report, Aug 27, 7:26 PM CDT, 16 minutes before
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</html>Local storm report, Aug 27, 7:39 PM CDT, 3 minutes before
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</html>Local storm report, Aug 27, 7:40 PM CDT, 2 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 28, 9:39 AM CDT | Beach Hazards Statement | DLH | Carlton, Saint Louis | 11 hr |
| Aug 28, 4:27 PM CDT | Small Craft Advisory | DLH | 5 hr | |
| Aug 27, 7:12 PM CDT | Severe Thunderstorm Warning | DLH | Bayfield, Douglas, Sawyer, Washburn | 33 min |
| Aug 27, 8:02 PM CDT | Areal Flood Advisory | DLH | Sawyer, Washburn | 118 min |
| Aug 27, 8:13 PM CDT | Areal Flood Advisory | DLH | Ashland, Bayfield, Douglas, Iron | 3 hr |
| Aug 27, 8:17 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Iron, Price, Sawyer | 43 min |
| Aug 27, 9:56 PM CDT | Areal Flood Advisory | DLH | Bayfield, Douglas | 8 hr |
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.