Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 129, NWS Duluth, MN

July 17, 2011Itasca County, Koochiching County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 17, 2011, 1:50 AM CDT for Itasca County, Koochiching County, Minnesota. It was in force for 40 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 17, 2011, 1:50 AM CDT (06:50 UTC)
Expired
Jul 17, 2011, 2:30 AM CDT
In force
40 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Itasca County, MN, Koochiching County, MN

The radar

The Duluth radar (KDLH), 162 km from the middle of the area, began a volume at 06:51 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, 6.8 hours before the alert went out and 83 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 2011-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1181 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 2011-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 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
1181 J/kg
Mixed-layer CIN
-107 J/kg
Mixed-layer LCL
1398 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
115 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.9

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 17, 12:43 AM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jul 17, 12:43 AM CDT, 1 hour 7 minutes before
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Hazardous weather outlook, Jul 16, 10:31 PM CDT, 3 hours 19 minutes before
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In the hours before

Special weather statement, Jul 17, 12:10 AM CDT, 1 hour 40 minutes before
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  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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Special weather statement, Jul 17, 12:53 AM CDT, 57 minutes before
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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 12:53 AM CDTSpecial Weather StatementDLHItasca, Koochiching112 min
Jul 17, 2:23 AM CDTSevere Thunderstorm WarningDLHItasca, Koochiching52 min
Jul 17, 3:10 AM CDTSevere Thunderstorm WarningDLHItasca26 min
Jul 17, 3:54 AM CDTSpecial Weather StatementDLHKoochiching36 min
Jul 17, 4:40 AM CDTSpecial Weather StatementDLHKoochiching35 min
Jul 17, 1:06 PM CDTFlash Flood WatchDLHAitkin, Carlton, Cass, Crow Wing, Itasca, Pine and 1 more14 hr
Jul 17, 1:15 PM CDTMarine Dense Fog AdvisoryDLH23 hr
Jul 17, 3:45 PM CDTSpecial Weather StatementDLHItasca45 min
Jul 17, 3:55 PM CDTSevere Thunderstorm WarningDLHItasca, Koochiching50 min
Jul 17, 4:03 PM CDTSpecial Weather StatementDLHSaint Louis27 min
Jul 17, 4:15 PM CDTSpecial Weather StatementDLH15 min
Jul 17, 4:31 PM CDTSpecial Weather StatementDLHItasca29 min
Jul 17, 4:38 PM CDTSpecial Weather StatementDLHKoochiching32 min
Jul 17, 4:52 PM CDTSevere Thunderstorm WarningDLHSaint Louis38 min
Jul 17, 4:58 PM CDTSpecial Weather StatementDLHSaint Louis32 min
Jul 17, 5:01 PM CDTSevere Thunderstorm WarningDLHItasca, Saint Louis44 min
Jul 17, 5:04 PM CDTSpecial Marine WarningDLH38 min
Jul 17, 5:15 PM CDTSevere Thunderstorm WarningDLHItasca, Saint Louis30 min
Jul 17, 5:30 PM CDTSpecial Weather StatementDLHLake30 min
Jul 17, 5:41 PM CDTSevere Thunderstorm WarningDLHSaint Louis21 min
Jul 17, 6:28 PM CDTSpecial Weather StatementDLHCarlton47 min
Jul 17, 6:33 PM CDTSpecial Marine WarningDLH53 min
Jul 17, 6:40 PM CDTSpecial Marine WarningDLH80 min
Jul 17, 4:56 PM CDTSpecial Weather StatementDLHAshland, Bayfield, Douglas19 min
Jul 17, 5:38 PM CDTSpecial Weather StatementDLHAshland, Bayfield, Iron22 min
Jul 17, 5:45 PM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Douglas30 min
Jul 17, 6:09 PM CDTSpecial Weather StatementDLHIron36 min
Jul 17, 6:14 PM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Iron46 min
Jul 17, 6:30 PM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Iron, Price, Sawyer30 min
Jul 17, 6:52 PM CDTFlash Flood WarningDLHAshland, Bayfield, Iron, Price, Sawyer3 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011Every severe thunderstorm warning in 2011

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.