Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 220, NWS Duluth, MN

October 3, 2018Ashland County, Iron County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Oct 3, 2018, 3:59 PM CDT for Ashland County, Iron 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
Oct 3, 2018, 3:59 PM CDT (20:59 UTC)
Expired
Oct 3, 2018, 4:30 PM CDT
In force
31 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Ashland County, WI, Iron County, WI

The radar

The Duluth radar (KDLH), 139 km from the middle of the area, began a volume at 20:59 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
Oct 3, 3:31 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.0 hours before the alert went out and 285 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, Green Bay/Straub, WI at 12:00Z on 2018-10-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Green Bay/Straub, WI at 12:00Z on 2018-10-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 557 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
527 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
557 m²/s²
0-3 km storm-relative helicity
541 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Oct 3, 2:32 PM CDT, 1 hour 27 minutes earlier.

Area forecast discussion, Oct 3, 2:32 PM CDT, 1 hour 27 minutes before
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Hazardous weather outlook, Oct 3, 3:36 PM CDT, 23 minutes before
Hazardous Weather Outlook
National Weather Service Duluth MN
336 PM CDT Wed Oct 3 2018

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-041200-
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-
336 PM CDT Wed Oct 3 2018

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

.DAY ONE...This afternoon and Tonight

Thunderstorms are possible across northwest Wisconsin this
afternoon, and also parts of northeast Minnesota closer to Lake
Superior. A few severe storms may occur this afternoon, mainly
over northwest Wisconsin. The main threat will be damaging winds,
large hail, and heavy rain. A tornado is also possible this
afternoon with the threat greatest over Price and parts of Sawyer,
Ashland, and Iron Counties. A Tornado Watch is in effect for
northwest Wisconsin and nearby areas of east-central Minnesota
through 11 pm this evening.

A strong cold front will rush through the Northland from the
northwest to southeast this afternoon and evening. Expect
widespread wind gusts of 30 to 40 mph in the wake of this cold
front with a dramatic drop in temperature. There could be isolated
gusts to nearly 50 mph from Duluth and along the higher and lower
terrain of the Minnesota North Shore, and as well as the exposed
Bong and Blatnik Bridges between Duluth and Superior.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

An inch or two of snow is possible Thursday night along and north
of the Iron Range.

.SPOTTER INFORMATION STATEMENT...

Skywarn Spotters may be needed today, especially this afternoon to
report severe weather in northwest Wisconsin.

LSZ121-140>148-041200-
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-
336 PM CDT Wed Oct 3 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 across western Lake Superior through
early this evening, primarily near the South Shore and Twin Ports
area. A Tornado Watch is in effect across the South Shore along
northern Wisconsin through 11 pm this evening.

Strong gale force gusts will occur over western Lake
Superior this evening with the possibility for some storm force
gusts. These winds will build waves to 7 to 9 ft along the
Bayfield peninsula late tonight into Thursday. A gale warning
remains in effect. Please see the latest marine products for
details.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

No hazardous weather is expected at this time.

GSF/G2

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, Oct 3, 2:27 PM CDT, 1 hour 32 minutes before
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Special weather statement, Oct 3, 2:40 PM CDT, 1 hour 19 minutes before
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Local storm report, Oct 3, 3:19 PM CDT, 40 minutes before
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Local storm report, Oct 3, 3:27 PM CDT, 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
327 PM CDT WED OCT 3 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0320 PM     HAIL             4 S PHILLIPS            45.64N 90.39W
10/03/2018  M0.25 INCH       PRICE              WI   PUBLIC

&&
Special weather statement, Oct 3, 3:46 PM CDT, 13 minutes before
Special Weather Statement
National Weather Service Duluth MN
346 PM CDT WED OCT 3 2018

MNZ012-021-032115-
Northern Cook/Northern Lake-Southern Cook/North Shore-
346 PM CDT WED OCT 3 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT COOK COUNTY...

At 346 PM CDT, strong thunderstorms were along a line extending from
Boundary Waters Canoe Area Wilderness, to 8 miles north of Lutsen, to
Tofte, and moving east at 65 mph.

Wind gusts up to 45 mph and frequent cloud to ground lightning can be
expected with these storms.

Locations impacted include...
Grand Marais, Lutsen, Tofte, Hovland, Eagle Mountain, Taconite
Harbor, Pine Lake, Tom Lake, Bearskin Lake, Temperance River State
Park, Judge Magney State Park, Watab Lake, White Pine Lake, Brule
Lake, Judge C. R. Magney State Park, Cherokee Lake, Cascade Lake,
Poplar Lake, Daniels Lake, and Clearwater Lake.

Seek shelter inside a sturdy building and away from windows until
these storms pass. Get off area lakes and seek shelter on shore in a
sturdy shelter or a hard-topped vehicle.

LAT...LON 4778 9000 4767 9050 4758 9074 4750 9086
      4748 9102 4798 9093 4810 9054 4811 9046
      4809 9037 4811 9018 4809 9003 4802 8999
      4801 8993 4799 8990 4799 8986 4796 8986
TIME...MOT...LOC 2046Z 252DEG 56KT 4797 9077 4779 9074 4756 9092

Huyck
Special weather statement, Oct 3, 3:51 PM CDT, 8 minutes before
Special Weather Statement
National Weather Service Duluth MN
351 PM CDT Wed Oct 3 2018

MNZ020-021-037-WIZ001-040000-
Southern Lake/North Shore-Southern Cook/North Shore-
Carlton/South St. Louis-Douglas-
Including the cities of Two Harbors, Silver Bay, Grand Marais,
Duluth, and Superior
351 PM CDT Wed Oct 3 2018

...Strong Wind Gusts this Evening...

A strong cold front will blast through the region this evening,
bringing strong wind gusts this evening through the wee hours of
Thursday morning. Areas from Duluth and up along the Minnesota
North Shore, and the Bong and Blatnik Bridges between Duluth and
Superior, could see isolated wind gusts to nearly 50 mph late this
evening. Please be advised if you are driving a high profile
vehicle that these winds could make driving difficult if not
unsafe. The winds will be from the northwest, with the strongest
winds occurring from about 8 pm to 11 pm.

G2

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 2, 10:05 PM CDTGale WarningDLH30 hr
Oct 3, 9:13 AM CDTDense Fog AdvisoryDLHCook, Lake, Saint Louis4 hr
Oct 3, 1:24 PM CDTSpecial Weather StatementDLHPine21 min
Oct 3, 1:54 PM CDTSpecial Weather StatementDLHItasca36 min
Oct 3, 2:21 PM CDTSpecial Weather StatementDLHSaint Louis39 min
Oct 3, 2:27 PM CDTSpecial Weather StatementDLHItasca18 min
Oct 3, 2:53 PM CDTSevere Thunderstorm WarningDLHLake, Saint Louis37 min
Oct 3, 3:21 PM CDTSevere Thunderstorm WarningDLHCook, Lake24 min
Oct 3, 3:46 PM CDTSpecial Weather StatementDLHCook29 min
Oct 3, 1:35 PM CDTSpecial Weather StatementDLHBurnett, Washburn25 min
Oct 3, 1:57 PM CDTSpecial Weather StatementDLHSawyer33 min
Oct 3, 2:24 PM CDTSpecial Weather StatementDLHWashburn21 min
Oct 3, 2:40 PM CDTSpecial Weather StatementDLHSawyer20 min
Oct 3, 2:49 PM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Sawyer26 min
Oct 3, 3:03 PM CDTSevere Thunderstorm WarningDLHPrice42 min
Oct 3, 3:15 PM CDTSevere Thunderstorm WarningDLHAshland, Iron, Sawyer45 min
Oct 3, 6:37 PM CDTSpecial Weather StatementDLHIron23 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.