Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 34, NWS Duluth, MN

July 4, 2017Koochiching County, Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 4, 2017, 11:33 PM CDT for Koochiching County, Saint Louis County, Minnesota. It was in force for 27 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
Jul 4, 2017, 11:33 PM CDT (04:33 UTC)
Expired
Jul 5, 2017, 12:00 AM CDT
In force
27 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Koochiching County, MN, Saint Louis County, MN

The radar

The Duluth radar (KDLH), 138 km from the middle of the area, began a volume at 04:34 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.

IssuedProductOfficeLasted
Jul 4, 6:03 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 4.6 hours before the alert went out and 74 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 2017-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2145 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, International Fa, MN at 00:00Z on 2017-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.1939Sfc1 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
2145 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1402 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
203 m²/s²
Significant tornado parameter
0.7
Supercell composite
5.4

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 Jul 4, 9:14 PM CDT, 2 hours 19 minutes earlier.

Area forecast discussion, Jul 4, 9:14 PM CDT, 2 hours 19 minutes before
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Hazardous weather outlook, Jul 4, 3:54 PM CDT, 7 hours 39 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Duluth MN
354 PM CDT Tue Jul 4 2017

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-051030-
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-
354 PM CDT Tue Jul 4 2017

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

.DAY ONE...This afternoon and tonight

There is a chance of thunderstorms this afternoon and this
evening from near Walker eastward through the Brainerd Lakes to
Pine City, Siren, and Spooner. Thunderstorms are also possible
north of the Iron Range to the International Border. A few of the
storms may be strong or severe with large hail the main threat.
Another round of thunderstorms will develop this afternoon over
North Dakota and southern Manitoba, and move southeastward across
most of the Northland tonight. Strong to severe thunderstorms are
expected with large hail, gusty winds, locally heavy rainfall, and
frequent cloud-to-ground lightning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorms are possible Wednesday afternoon into Wednesday
night across the Northland. A few storms may be strong to severe,
and produce heavy rainfall. The Storm Prediction Center has the
Northland under a Marginal Risk of severe thunderstorms Wednesday
and Wednesday night. The strongest storms may produce large hail,
damaging winds and torrential rainfall.

Severe thunderstorms are much more likely on Thursday and
Thursday evening, especially across the eastern third of Minnesota
and northwest Wisconsin. The Storm Prediction Center has
indicated a Slight Risk of severe thunderstorms across much of the
area, along with an Enhanced Risk across portions of northern
Wisconsin. Very large hail and damaging winds will be the main
threats.

There is a small chance of thunderstorms Saturday afternoon and
evening. Severe weather is not anticipated at this time.

.SPOTTER INFORMATION STATEMENT...

SKYWARN Spotters may be needed this afternoon and tonight.

LSZ121-140>148-051030-
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-
354 PM CDT Tue Jul 4 2017

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 late
tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorms are possible Wednesday and Wednesday night. Some of
the storms may be strong or severe with large hail, gusty winds,
frequent cloud-to-water lightning, and heavy rain.

Thunderstorms are likely Thursday and Thursday evening, some of
which may be severe. Very large hail, damaging wind gusts,
frequent cloud-to-water lightning, and torrential rainfall are
possible.

There is a small chance of thunderstorms Saturday afternoon and
evening.

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, Jul 4, 9:54 PM CDT, 1 hour 39 minutes before
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Special weather statement, Jul 4, 10:49 PM CDT, 44 minutes before
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Special weather statement, Jul 4, 11:17 PM CDT, 16 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 9:54 PM CDTSpecial Weather StatementDLHKoochiching66 min
Jul 4, 10:49 PM CDTSpecial Weather StatementDLHKoochiching41 min
Jul 4, 11:17 PM CDTSpecial Weather StatementDLHKoochiching13 min
Jul 5, 12:21 AM CDTSpecial Weather StatementDLHSaint Louis9 min
Jul 5, 12:25 AM CDTSpecial Weather StatementDLH20 min
Jul 5, 12:37 AM CDTSpecial Weather StatementDLH23 min
Jul 5, 12:50 AM CDTSpecial Weather StatementDLHLake40 min
Jul 5, 1:01 AM CDTSpecial Weather StatementDLHSaint Louis44 min
Jul 5, 1:21 AM CDTSpecial Weather StatementDLHLake39 min
Jul 5, 1:44 AM CDTSpecial Weather StatementDLHSaint Louis46 min
Jul 5, 2:15 AM CDTSpecial Weather StatementDLHSaint Louis30 min
Jul 5, 2:46 AM CDTSpecial Weather StatementDLHSaint Louis29 min
Jul 5, 2:48 AM CDTSpecial Weather StatementDLH27 min
Jul 5, 3:52 AM CDTSpecial Weather StatementDLHSaint Louis23 min
Jul 5, 3:21 AM CDTSpecial Weather StatementDLHAshland, Bayfield24 min
Jul 5, 3:49 AM CDTSpecial Weather StatementDLHAshland, Bayfield, Douglas26 min
Jul 5, 4:27 AM CDTSpecial Weather StatementDLHDouglas33 min
Jul 5, 5:04 AM CDTSpecial Weather StatementDLHDouglas26 min
Jul 5, 5:32 AM CDTSpecial Weather StatementDLHDouglas28 min
Jul 5, 6:00 AM CDTSpecial Weather StatementDLHBayfield, Douglas, Washburn30 min
Jul 5, 6:02 AM CDTSpecial Weather StatementDLHDouglas28 min
Jul 5, 6:31 AM CDTSpecial Weather StatementDLHBayfield, Washburn29 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017Every severe thunderstorm warning in 2017

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.