Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 8, NWS Duluth, MN

May 25, 2018Sawyer County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at May 25, 2018, 6:59 PM CDT for Sawyer County, Wisconsin. It was in force for 31 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
May 25, 2018, 6:59 PM CDT (23:59 UTC)
Expired
May 25, 2018, 7:30 PM CDT
In force
31 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Sawyer County, WI

The radar

The Duluth radar (KDLH), 134 km from the middle of the area, began a volume at 00:03 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.

IssuedProductOfficeLasted
May 25, 2:02 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 12.0 hours before the alert went out and 223 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.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2018-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 543 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2018-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 245 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
543 J/kg
Mixed-layer CIN
-136 J/kg
Mixed-layer LCL
1022 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
245 m²/s²
0-3 km storm-relative helicity
234 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

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 May 25, 6:45 PM CDT, 14 minutes earlier.

Area forecast discussion, May 25, 6:45 PM CDT, 14 minutes before
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Hazardous weather outlook, May 25, 2:50 PM CDT, 4 hours 9 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Duluth MN
250 PM CDT Fri May 25 2018

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-261130-
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-
250 PM CDT Fri May 25 2018

This Hazardous Weather Outlook is for portions of northeast
Minnesota and northwest Wisconsin.

.DAY ONE...This afternoon and Tonight

Thunderstorms are likely over much of the Northland this
afternoon through this evening. Some of the storms may be severe
with large hail, frequent lightning, and damaging winds possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Thunderstorms will be possible over far northeast Minnesota into
parts of northwest Wisconsin on Saturday. Severe storms are not
expected.

Several rounds of thunderstorms are expected from Sunday night
through Thursday. Some storms may be strong to severe, especially
Monday night and Tuesday.

.SPOTTER INFORMATION STATEMENT...

SKYWARN Spotters will be needed through this evening, especially
for Burnett, Washburn, Sawyer, and Price counties. Please report
hail of any size, wind damage, and observed flooding to the
National Weather Service.

LSZ121-140>148-261130-
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-
250 PM CDT Fri May 25 2018

This Hazardous Weather Outlook is for portions of the Nearshore
waters of western Lake Superior.

.DAY ONE...This afternoon and Tonight

Scattered thunderstorms are forecast over western Lake Superior
through this evening. A few storms may be strong with small hail,
frequent lightning, and gusty winds.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Isolated thunderstorms are possible Saturday afternoon. Severe
storms are not expected.

Several rounds of thunderstorms are expected from Sunday night
through Thursday. Some of the storms may be strong to severe,
especially Monday night and Tuesday.

Huyck/Stewart

More information may be obtained at the following web address:
http://www.weather.gov/duluth (all lower case)

In the hours before

Special weather statement, May 25, 5:07 PM CDT, 1 hour 52 minutes before
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Special weather statement, May 25, 5:29 PM CDT, 1 hour 30 minutes before
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Special weather statement, May 25, 5:57 PM CDT, 1 hour 2 minutes before
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Local storm report, May 25, 6:01 PM CDT, 58 minutes before
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Local storm report, May 25, 6:31 PM CDT, 28 minutes before
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Local storm report, May 25, 6:55 PM CDT, 4 minutes before
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The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 25, 12:22 AM CDTSpecial Weather StatementDLHKoochiching23 min
May 25, 12:50 AM CDTSpecial Weather StatementDLHKoochiching25 min
May 25, 12:54 AM CDTSpecial Weather StatementDLHCook21 min
May 25, 1:18 AM CDTSpecial Weather StatementDLHKoochiching27 min
May 25, 2:44 AM CDTMarine Dense Fog AdvisoryDLH7 hr
May 25, 10:01 AM CDTMarine Dense Fog AdvisoryDLH6 hr
May 25, 3:12 PM CDTSpecial Marine WarningDLH33 min
May 25, 3:31 PM CDTSpecial Marine WarningDLH29 min
May 25, 4:44 PM CDTSpecial Weather StatementDLHCarlton16 min
May 24, 7:06 PM CDTSpecial Weather StatementDLHIron24 min
May 25, 4:25 AM CDTSpecial Weather StatementDLHSawyer35 min
May 25, 1:32 PM CDTSpecial Weather StatementDLHPrice28 min
May 25, 3:55 PM CDTSpecial Weather StatementDLHWashburn20 min
May 25, 4:14 PM CDTSpecial Weather StatementDLHWashburn16 min
May 25, 4:29 PM CDTSevere Thunderstorm WarningDLHSawyer, Washburn31 min
May 25, 5:07 PM CDTSpecial Weather StatementDLHWashburn23 min
May 25, 5:29 PM CDTSpecial Weather StatementDLHSawyer31 min
May 25, 5:41 PM CDTSevere Thunderstorm WarningDLHAshland, Sawyer34 min
May 25, 5:57 PM CDTSpecial Weather StatementDLHSawyer33 min
May 25, 6:10 PM CDTSevere Thunderstorm WarningDLHSawyer35 min
May 25, 6:24 PM CDTSevere Thunderstorm WarningDLHSawyer36 min
May 25, 6:42 PM CDTSevere Thunderstorm WarningDLHSawyer23 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.