Alert archive / Minnesota / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 87, NWS Duluth, MN

July 26, 2019Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 26, 2019, 4:18 PM CDT for Saint Louis 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
Jul 26, 2019, 4:18 PM CDT (21:18 UTC)
Expired
Jul 26, 2019, 5:00 PM CDT
In force
42 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Saint Louis County, MN

The radar

The Duluth radar (KDLH), 86 km from the middle of the area, began a volume at 21:18 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 26, 2:26 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.3 hours before the alert went out and 317 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 2019-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 2019-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 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
1 J/kg
Mixed-layer CIN
-359 J/kg
Mixed-layer LCL
983 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
245 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 Jul 26, 2:01 PM CDT, 2 hours 17 minutes earlier.

Area forecast discussion, Jul 26, 2:01 PM CDT, 2 hours 17 minutes before
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Hazardous weather outlook, Jul 26, 2:02 PM CDT, 2 hours 16 minutes before
Hazardous Weather Outlook
National Weather Service Duluth MN
202 PM CDT Fri Jul 26 2019

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-271915-
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-
202 PM CDT Fri Jul 26 2019

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

.DAY ONE...This afternoon and Tonight

Scattered thunderstorms will develop this afternoon across
northeast Minnesota and track east across western Lake Superior
and northwest Wisconsin. Storms will be strong to severe, capable
of large hail and damaging wind gusts. Tornadoes are also
possible. The greatest severe weather risk is across the Minnesota
Arrowhead, but all parts of northeast Minnesota and northwest
Wisconsin have a chance to see severe storms today into this
evening. Storms will exit from west to east towards midnight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Thunderstorms are possible Sunday afternoon through Sunday night.
Severe storms are not expected.

.SPOTTER INFORMATION STATEMENT...

Skywarn spotters may be needed this afternoon into early evening.

LSZ121-140>148-271915-
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-
202 PM CDT Fri Jul 26 2019

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

.DAY ONE...This afternoon and Tonight

Scattered thunderstorms, some strong to near severe, are possible
this afternoon and tonight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The probability for widespread hazardous weather is low.

JJM/GSF

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 26, 3:07 PM CDT, 1 hour 11 minutes before
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Special weather statement, Jul 26, 3:41 PM CDT, 37 minutes before
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Special weather statement, Jul 26, 4:09 PM CDT, 9 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 26, 1:07 AM CDTSpecial Weather StatementDLHItasca23 min
Jul 26, 1:46 AM CDTSpecial Weather StatementDLHSaint Louis29 min
Jul 26, 1:49 AM CDTSpecial Weather StatementDLHItasca26 min
Jul 26, 2:13 AM CDTSpecial Weather StatementDLHSaint Louis32 min
Jul 26, 2:16 AM CDTSpecial Weather StatementDLHItasca29 min
Jul 26, 2:35 AM CDTSpecial Weather StatementDLHCrow Wing25 min
Jul 26, 2:53 AM CDTSpecial Weather StatementDLH37 min
Jul 26, 2:56 AM CDTSpecial Weather StatementDLHAitkin34 min
Jul 26, 3:01 AM CDTSevere Thunderstorm WarningDLHAitkin, Crow Wing44 min
Jul 26, 3:28 AM CDTSpecial Weather StatementDLHAitkin32 min
Jul 26, 3:36 AM CDTSpecial Weather StatementDLHLake24 min
Jul 26, 3:48 AM CDTSpecial Weather StatementDLHMille Lacs27 min
Jul 26, 4:01 AM CDTSpecial Weather StatementDLHCarlton29 min
Jul 26, 4:34 AM CDTSpecial Weather StatementDLHCarlton26 min
Jul 26, 7:34 AM CDTAreal Flood AdvisoryDLHPine3 hr
Jul 26, 3:07 PM CDTSpecial Weather StatementDLHKoochiching8 min
Jul 26, 3:41 PM CDTSpecial Weather StatementDLHItasca19 min
Jul 26, 4:09 PM CDTSpecial Weather StatementDLHSaint Louis21 min
Jul 26, 4:48 PM CDTSpecial Weather StatementDLHSaint Louis12 min
Jul 26, 4:58 PM CDTSevere Thunderstorm WarningDLHSaint Louis32 min
Jul 26, 5:09 PM CDTSevere Thunderstorm WarningDLHSaint Louis51 min
Jul 26, 5:31 PM CDTSpecial Weather StatementDLHLake14 min
Jul 26, 5:40 PM CDTSevere Thunderstorm WarningDLHCook, Lake50 min
Jul 26, 5:48 PM CDTSpecial Weather StatementDLHPine12 min
Jul 26, 5:59 PM CDTSevere Thunderstorm WarningDLHSaint Louis46 min
Jul 26, 6:29 PM CDTSevere Thunderstorm WarningDLHCook, Lake61 min
Jul 26, 6:46 PM CDTSpecial Marine WarningDLH59 min
Jul 26, 6:48 PM CDTSevere Thunderstorm WarningDLHLake, Saint Louis42 min
Jul 26, 6:57 PM CDTSpecial Marine WarningDLH48 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2019Every severe thunderstorm warning in 2019

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.