Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 210, NWS Duluth, MN

September 14, 2018Cass County, Itasca County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Sep 14, 2018, 11:18 PM CDT for Cass County, Itasca County, Minnesota. It was in force for 42 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
Sep 14, 2018, 11:18 PM CDT (04:18 UTC)
Expired
Sep 15, 2018, 12:00 AM CDT
In force
42 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Cass County, MN, Itasca County, MN

The radar

The Duluth radar (KDLH), 141 km from the middle of the area, began a volume at 04:17 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 nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 4.3 hours before the alert went out and 157 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, International Fa, MN at 00:00Z on 2018-09-15Temperature 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, International Fa, MN at 00:00Z on 2018-09-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.1939587897Sfc1 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
1280 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
77 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 Sep 14, 6:42 PM CDT, 4 hours 36 minutes earlier.

Area forecast discussion, Sep 14, 6:42 PM CDT, 4 hours 36 minutes before
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Hazardous weather outlook, Sep 14, 3:03 PM CDT, 8 hours 15 minutes before
Hazardous Weather Outlook
National Weather Service Duluth MN
303 PM CDT Fri Sep 14 2018

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-152015-
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-
303 PM CDT Fri Sep 14 2018

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

.DAY ONE...This afternoon and Tonight

There is chance for thunderstorms late today and tonight across
the Northland, with the best chance for storms in northeast
Minnesota along and north of Highway 2 tonight. A few storms
could be strong producing large hail and gusty winds. In addition,
repeat showers and storms producing heavy rainfall may lead to
localized flooding for areas along and north of the Iron Range.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Several rounds of thunderstorms are forecast Saturday through
Monday night. Some storms may be strong to severe, especially
Saturday evening, and may also produce locally heavy rainfall.

Strong northeast winds on Saturday will likely lead to a high
risk for rip currents for the beaches of Duluth and Superior.

Rain and thunderstorms return to the forecast Wednesday afternoon
through Thursday night. Some storms may be strong to severe and
heavy rainfall is possible.

.SPOTTER INFORMATION STATEMENT...

SKYWARN spotters are encouraged to report hail of any size and
rainfall amounts to the National Weather Service.

LSZ121-140>148-152015-
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-
303 PM CDT Fri Sep 14 2018

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

.DAY ONE...This afternoon and Tonight

Isolated thunderstorms are possible tonight. Some storms may be
strong to severe with frequent lightning, large hail, and gusty
winds.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Strong northeast winds are expected to develop late tonight and
continue through Sunday morning. The strong winds and resultant
waves will create conditions hazardous to smaller vessels. A
Small Craft Advisory may be needed.

Several rounds of isolated thunderstorms are forecast from
Saturday afternoon through Monday night. Some storms may be
strong to severe. Another round of rain and thunderstorms is
possible Wednesday evening through Thursday night.

JJM/Huyck

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, Sep 14, 9:57 PM CDT, 1 hour 21 minutes before
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Special weather statement, Sep 14, 10:17 PM CDT, 1 hour 1 minute before
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Special weather statement, Sep 14, 10:35 PM CDT, 43 minutes before
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Special weather statement, Sep 14, 10:51 PM CDT, 27 minutes before
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Special weather statement, Sep 14, 10:57 PM CDT, 21 minutes before
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Special weather statement, Sep 14, 11:01 PM CDT, 17 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 14, 7:12 PM CDTSpecial Weather StatementDLHCrow Wing33 min
Sep 14, 7:30 PM CDTSevere Thunderstorm WarningDLHCass, Crow Wing45 min
Sep 14, 8:03 PM CDTSevere Thunderstorm WarningDLHAitkin, Crow Wing27 min
Sep 14, 8:30 PM CDTSevere Thunderstorm WarningDLHAitkin, Crow Wing30 min
Sep 14, 8:41 PM CDTSpecial Weather StatementDLHAitkin34 min
Sep 14, 8:42 PM CDTSpecial Weather StatementDLHCass33 min
Sep 14, 8:58 PM CDTSevere Thunderstorm WarningDLHAitkin32 min
Sep 14, 9:28 PM CDTSevere Thunderstorm WarningDLHAitkin32 min
Sep 14, 9:29 PM CDTSpecial Weather StatementDLHCass16 min
Sep 14, 9:49 PM CDTSmall Craft AdvisoryDLH30 hr
Sep 14, 9:55 PM CDTSpecial Weather StatementDLHHubbard20 min
Sep 14, 9:57 PM CDTSpecial Weather StatementDLHCass33 min
Sep 14, 9:59 PM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Pine31 min
Sep 14, 10:10 PM CDTSevere Thunderstorm WarningDLHAitkin, Cass50 min
Sep 14, 10:17 PM CDTSpecial Weather StatementDLHCass13 min
Sep 14, 10:27 PM CDTSevere Thunderstorm WarningDLHCarlton, Pine48 min
Sep 14, 10:35 PM CDTSpecial Weather StatementDLHCass25 min
Sep 14, 10:51 PM CDTSpecial Weather StatementDLHLake24 min
Sep 14, 10:57 PM CDTSpecial Weather StatementDLHItasca18 min
Sep 14, 11:01 PM CDTSpecial Weather StatementDLHAitkin29 min
Sep 14, 11:34 PM CDTSpecial Weather StatementDLHCarlton26 min
Sep 14, 11:59 PM CDTSpecial Weather StatementDLHCarlton16 min
Sep 15, 12:03 AM CDTSpecial Weather StatementDLHItasca27 min
Sep 15, 12:11 AM CDTSevere Thunderstorm WarningDLHAitkin, Itasca, Saint Louis49 min
Sep 15, 12:48 AM CDTSpecial Weather StatementDLHAitkin27 min
Sep 15, 12:50 AM CDTSpecial Weather StatementDLHCarlton25 min
Sep 15, 1:01 AM CDTSevere Thunderstorm WarningDLHCarlton, Saint Louis44 min
Sep 15, 1:16 AM CDTSpecial Weather StatementDLHAitkin14 min
Sep 15, 1:22 AM CDTSpecial Marine WarningDLH38 min
Sep 15, 1:44 AM CDTSevere Thunderstorm WarningDLHCarlton, Saint Louis31 min
Sep 15, 1:53 AM CDTSpecial Weather StatementDLHCarlton22 min
Sep 15, 2:00 AM CDTSpecial Marine WarningDLH45 min
Sep 15, 2:48 AM CDTSpecial Marine WarningDLH42 min
Sep 15, 3:08 AM CDTSpecial Weather StatementDLHAitkin37 min
Sep 15, 3:30 AM CDTSpecial Marine WarningDLH60 min
Sep 15, 3:47 AM CDTSpecial Weather StatementDLHPine28 min
Sep 15, 3:49 AM CDTBeach Hazards StatementDLHCarlton, Saint Louis17 hr
Sep 15, 4:20 AM CDTSpecial Weather StatementDLHPine25 min
Sep 15, 4:28 AM CDTSpecial Marine WarningDLH32 min
Sep 15, 7:16 AM CDTAreal Flood AdvisoryDLHCarlton, Pine3 hr
Sep 15, 2:18 AM CDTSpecial Weather StatementDLHDouglas27 min
Sep 15, 2:46 AM CDTSpecial Weather StatementDLHBayfield, Douglas29 min
Sep 15, 3:01 AM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Douglas44 min
Sep 15, 3:46 AM CDTSpecial Weather StatementDLHBayfield29 min
Sep 15, 4:55 AM CDTSpecial Weather StatementDLHBurnett35 min
Sep 15, 5:31 AM CDTSpecial Weather StatementDLHWashburn29 min
Sep 15, 6:02 AM CDTSpecial Weather StatementDLHSawyer28 min
Sep 15, 6:28 AM CDTSpecial Weather StatementDLHSawyer32 min
Sep 15, 7:02 AM CDTSpecial Weather StatementDLHPrice28 min
Sep 15, 7:04 AM CDTSpecial Weather StatementDLHBurnett26 min
Sep 15, 7:28 AM CDTSpecial Weather StatementDLHPrice32 min
Sep 15, 7:29 AM CDTSpecial Weather StatementDLHWashburn31 min
Sep 15, 7:31 AM CDTSpecial Weather StatementDLHDouglas29 min
Sep 15, 7:59 AM CDTSpecial Weather StatementDLHSawyer31 min
Sep 15, 8:02 AM CDTSpecial Weather StatementDLHWashburn28 min
Sep 15, 8:04 AM CDTSpecial Weather StatementDLHDouglas26 min
Sep 15, 8:30 AM CDTSpecial Weather StatementDLHDouglas30 min
Sep 15, 8:32 AM CDTSpecial Weather StatementDLHSawyer28 min
Sep 15, 8:56 AM CDTSpecial Weather StatementDLHDouglas34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.