Alert archive / Minnesota / Tornado Warnings in 2010

Tornado Warning 26, NWS Duluth, MN

July 17, 2010Cass County, Crow Wing County, Minnesota

NWS Duluth, MN issued this tornado warning at Jul 17, 2010, 12:49 PM CDT for Cass County, Crow Wing County, Minnesota. It was in force for 26 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, 2010, 12:49 PM CDT (17:49 UTC)
Expired
Jul 17, 2010, 1:15 PM CDT
In force
26 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon

Counties Cass County, MN, Crow Wing County, MN

The radar

The Duluth radar (KDLH), 152 km from the middle of the area, began a volume at 17:52 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 17, 12:28 PM CDTTornado WatchSPC11 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 5.8 hours before the alert went out and 213 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 2010-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 368 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 2010-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 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
368 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
1285 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
226 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Jul 17, 12:48 PM CDT, 1 minute earlier.

Area forecast discussion, Jul 17, 12:48 PM CDT, 1 minute before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<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.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Jul 17, 8:51 AM CDT, 3 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DULUTH MN
851 AM CDT SAT JUL 17 2010

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-181030-
KOOCHICHING-NORTHERN ST. LOUIS-NORTHERN COOK/NORTHERN LAKE-
NORTHERN ITASCA-CENTRAL ST. LOUIS-SOUTHERN LAKE/LAKESHORE-
SOUTHERN COOK/LAKESHORE-NORTHERN CASS-SOUTHERN ITASCA-
SOUTHERN CASS-CROW WING-NORTHERN AITKIN-SOUTHERN AITKIN-
CARLTON/SOUTHERN ST. LOUIS-PINE-DOUGLAS-BAYFIELD-ASHLAND-IRON-
BURNETT-WASHBURN-SAWYER-PRICE-
851 AM CDT SAT JUL 17 2010

...THERE IS A MODERATE RISK OF SEVERE WEATHER NEAR THE BRAINERD
LAKES AREA TO THE ST. CROIX RIVER VALLEY THIS AFTERNOON...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MINNESOTA AND
NORTHWEST WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

THE MODERATE RISK OF SEVERE THUNDERSTORMS WILL BE FOUND WEST OF A
LINE FROM HACKENSACK TO DUXBURY MINNESOTA TO HERTEL WISCONSIN.
THIS AREA IS LIKELY TO ENCOUNTER THUNDERSTORMS WITH VERY LARGE
HAIL AND DAMAGING WINDS. THE SLIGHT RISK OF SEVERE THUNDERSTORMS
IS WEST OF A LINE FROM LITTLEFORK TO TWO HARBORS
MINNESOTA...PORT WING TO PARK FALLS WISCONSIN...INCLUDING THE
TWIN PORTS HARBOR. THE MAIN HAZARDS WITH ANY SEVERE STORM WILL BE
LARGE HAIL AND DAMAGING WINDS. HEAVY RAIN AND FREQUENT LIGHTNING
WILL ALSO ACCOMPANY THE STORMS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

AN UNSETTLED WEATHER PATTERN WILL REMAIN ACROSS THE REGION NEXT
WEEK. THUNDERSTORMS MAY DEVELOP MONDAY THROUGH WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

LSZ121-140>148-181030-
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-
851 AM CDT SAT JUL 17 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF
WESTERN LAKE SUPERIOR.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE EXPECTED TO BECOME WIDESPREAD AND MOVE ACROSS
LAKE SUPERIOR LATE THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT
RISK OF SEVERE THUNDERSTORMS SOUTH OF A TWO HARBORS MINNESOTA TO
PORT WING WISCONSIN LINE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS NORTH OF GRAND MARAIS SUNDAY.

AN UNSETTLED WEATHER PATTERN WILL REMAIN ACROSS THE REGION NEXT
WEEK. THUNDERSTORMS MAY DEVELOP MONDAY THROUGH WEDNESDAY.

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 17, 12:05 PM CDT, 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
1205 PM CDT SAT JUL 17 2010

MNZ033-034-171800-
CROW WING-SOUTH CASS-
1205 PM CDT SAT JUL 17 2010

...STRONG THUNDERSTORMS DEVELOPING ACROSS CENTRAL MINNESOTA...

AT 1159 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
RAPIDLY DEVELOPING THUNDERSTORMS 7 MILES NORTH OF POPLAR...MOVING
SOUTHEAST AT 40 MPH. ANOTHER STRONG STORM WAS LOCATED 10 MILES EAST
OF DETROIT LAKES...MOVING SOUTHEAST AT 40 MPH.

THESE STORMS ARE CAPABLE OF PRODUCING UP TO NICKEL SIZE HAIL...WIND
GUSTS UP TO 50 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...BRIEF HEAVY
DOWNPOURS. PLEASE MONITOR NOAA WEATHER RADIO OR LOCAL MEDIA
OUTLETS...AS SEVERE WEATHER WARNINGS MAY BE NEEDED THIS AFTERNOON.

LOCATIONS IMPACTED THROUGH 130 PM INCLUDE...
  CASINO...             JENKINS...            PILLAGER...
  PEQUOT LAKES...       LAKE SHORE...         GULL LAKE...
  SYLVAN...             NISSWA...             BREEZY POINT...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS
TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS
PASSED.

LAT...LON 4663 9479 4679 9468 4656 9381 4628 9380
      4615 9390 4615 9433 4617 9438 4621 9440
      4629 9436 4632 9443 4629 9454 4635 9466
      4635 9473 4640 9480

LONKA
Local storm report, Jul 17, 12:15 PM CDT, 34 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<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.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 12:05 PM CDTSpecial Weather StatementDLHCrow Wing55 min
Jul 17, 12:17 PM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Crow Wing43 min
Jul 17, 1:29 PM CDTSpecial Weather StatementDLHAitkin46 min
Jul 17, 1:51 PM CDTSpecial Weather StatementDLHCass39 min
Jul 17, 2:25 PM CDTSpecial Weather StatementDLHCass50 min
Jul 17, 2:29 PM CDTSpecial Weather StatementDLHCrow Wing46 min
Jul 17, 3:19 PM CDTSpecial Weather StatementDLHAitkin26 min
Jul 17, 4:25 PM CDTSevere Thunderstorm WarningDLHAitkin, Crow Wing50 min
Jul 17, 4:27 PM CDTSevere Thunderstorm WarningDLHCass33 min
Jul 17, 4:58 PM CDTSevere Thunderstorm WarningDLHCass, Crow Wing47 min
Jul 17, 5:11 PM CDTSevere Thunderstorm WarningDLHAitkin, Crow Wing34 min
Jul 17, 5:40 PM CDTFlash Flood WarningDLHCass119 min
Jul 17, 5:40 PM CDTSevere Thunderstorm WarningDLHAitkin, Crow Wing50 min
Jul 17, 5:54 PM CDTSevere Thunderstorm WarningDLHCrow Wing36 min
Jul 17, 6:03 PM CDTSpecial Weather StatementDLHPine27 min
Jul 17, 6:31 PM CDTSevere Thunderstorm WarningDLHAitkin, Crow Wing28 min
Jul 17, 6:42 PM CDTSpecial Weather StatementDLHPine33 min
Jul 17, 6:44 PM CDTSpecial Weather StatementDLHCrow Wing46 min

Nearby

Tornado Warnings in Minnesota, 2010Every tornado warning in 2010Tornadoes in 2010

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.