Alert archive / Wisconsin / Tornado Warnings in 2010

Tornado Warning 29, NWS Duluth, MN

July 27, 2010Ashland County, Iron County, Wisconsin

NWS Duluth, MN issued this tornado warning at Jul 27, 2010, 6:28 PM CDT for Ashland County, Iron County, Wisconsin. It was in force for 47 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 27, 2010, 6:28 PM CDT (23:28 UTC)
Expired
Jul 27, 2010, 7:15 PM CDT
In force
47 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon

Counties Ashland County, WI, Iron County, WI

The radar

The Duluth radar (KDLH), 139 km from the middle of the area, began a volume at 23:30 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 27, 3:29 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 298 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 2010-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2143 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 2010-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 square meters per square second.193958Sfc1 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
2143 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
832 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
256 m²/s²
Significant tornado parameter
1.9
Supercell composite
21.5

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 27, 6:27 PM CDT, 1 minute earlier.

Area forecast discussion, Jul 27, 6:27 PM CDT, 1 minute before
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Hazardous weather outlook, Jul 27, 3:54 PM CDT, 2 hours 34 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
354 PM CDT TUE JUL 27 2010

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-281030-
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-
354 PM CDT TUE JUL 27 2010

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

INTENSE THUNDERSTORMS...SOME SEVERE...WILL CROSS THE ENTIRE AREA
THIS EVENING. THREATS INCLUDE DAMAGING WINDS...LARGE HAIL AND
TORNADOES. THE THREAT OF WIDESPREAD DAMAGING WINDS...TORNADOES AND
VERY LARGE HAIL ARE GREATEST SOUTH AND EAST OF THE IRON RANGE UP
THE NORTH SHORE TO THE SILVER BAY AREA... INCLUDING THE TWIN PORTS
AREA...AND ACROSS ALL OF NORTHWEST WISCONSIN.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SCATTERED THUNDERSTORMS WILL OCCUR FRIDAY INTO THE COMING WEEKEND.
THESE THUNDERSTORMS ARE NOT EXPECTED TO BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL LIKELY BE NEEDED TONIGHT.

LSZ121-140>148-281030-
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 27 2010

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

INTENSE THUNDERSTORMS...SOME SEVERE...WILL CROSS WESTERN LAKE
SUPERIOR THIS EVENING. THREATS INCLUDE SUDDEN STRONG WINDS AND
LARGE HAIL...WITH THE GREATEST LIKELIHOOD FROM THE SILVER BAY AREA
SOUTHWARD NEAR THE TWIN PORTS AND ALONG THE WISCONSIN SOUTH SHORE.
WATERSPOUTS ARE ALSO POSSIBLE ACROSS THE WESTERN PORTION OF LAKE
SUPERIOR.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SCATTERED THUNDERSTORMS WILL OCCUR FRIDAY INTO THE COMING WEEKEND.
THESE THUNDERSTORMS ARE NOT EXPECTED TO BE SEVERE.

DAP

MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB ADDRESS:
HTTP://WWW.WEATHER.GOV/DULUTH (ALL LOWER CASE)

In the hours before

Local storm report, Jul 27, 6:00 PM CDT, 28 minutes before
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Local storm report, Jul 27, 6:10 PM CDT, 18 minutes before
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Local storm report, Jul 27, 6:14 PM CDT, 14 minutes before
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Local storm report, Jul 27, 6:18 PM CDT, 10 minutes before
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Local storm report, Jul 27, 6:19 PM CDT, 9 minutes before
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Local storm report, Jul 27, 6:25 PM CDT, 3 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 12:25 AM CDTSpecial Weather StatementDLHKoochiching65 min
Jul 27, 12:57 AM CDTSpecial Weather StatementDLHKoochiching63 min
Jul 27, 1:47 AM CDTSevere Thunderstorm WarningDLHKoochiching43 min
Jul 27, 2:25 AM CDTSevere Thunderstorm WarningDLHKoochiching35 min
Jul 27, 3:01 AM CDTSpecial Weather StatementDLH59 min
Jul 27, 3:02 AM CDTSmall Craft AdvisoryDLH6 hr
Jul 27, 3:19 AM CDTSpecial Weather StatementDLH56 min
Jul 27, 3:30 AM CDTSpecial Weather StatementDLHWadena30 min
Jul 27, 3:54 AM CDTSpecial Weather StatementDLH51 min
Jul 27, 4:00 AM CDTSpecial Weather StatementDLHAitkin, Cass, Crow Wing60 min
Jul 27, 5:14 AM CDTSpecial Weather StatementDLHLake, Saint Louis61 min
Jul 27, 6:09 AM CDTSpecial Weather StatementDLHPine66 min
Jul 27, 6:22 AM CDTSpecial Weather StatementDLHLake53 min
Jul 27, 6:32 AM CDTSevere Thunderstorm WarningDLHCass, Crow Wing43 min
Jul 27, 7:15 AM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Crow Wing45 min
Jul 27, 8:08 AM CDTSpecial Weather StatementDLHPine52 min
Jul 27, 9:05 AM CDTSpecial Weather StatementDLHPine55 min
Jul 27, 11:40 AM CDTSpecial Weather StatementDLHCrow Wing65 min
Jul 27, 1:04 PM CDTSpecial Weather StatementDLHCrow Wing56 min
Jul 27, 2:20 PM CDTSpecial Weather StatementDLHAitkin55 min
Jul 27, 3:59 PM CDTSpecial Weather StatementDLHCarlton31 min
Jul 27, 4:21 PM CDTSevere Thunderstorm WarningDLHAitkin39 min
Jul 27, 4:50 PM CDTSpecial Weather StatementDLHCarlton40 min
Jul 27, 5:05 PM CDTAreal Flood AdvisoryDLHAitkin, Carlton, Crow Wing, Saint Louis5 hr
Jul 27, 5:08 PM CDTSevere Thunderstorm WarningDLHSaint Louis22 min
Jul 27, 5:12 PM CDTSpecial Marine WarningDLH33 min
Jul 27, 5:25 PM CDTSpecial Weather StatementDLHPine35 min
Jul 27, 5:45 PM CDTSpecial Weather StatementDLHPine45 min
Jul 27, 5:52 PM CDTSevere Thunderstorm WarningDLHPine23 min
Jul 27, 6:09 PM CDTSevere Thunderstorm WarningDLHPine36 min
Jul 27, 6:34 PM CDTSevere Thunderstorm WarningDLHPine26 min
Jul 27, 7:14 AM CDTSpecial Weather StatementDLHBurnett46 min
Jul 27, 8:36 AM CDTSpecial Weather StatementDLHPrice, Sawyer54 min
Jul 27, 9:28 AM CDTSpecial Weather StatementDLHPrice32 min
Jul 27, 10:40 AM CDTSpecial Weather StatementDLHSawyer65 min
Jul 27, 11:14 AM CDTSpecial Weather StatementDLHPrice61 min
Jul 27, 12:11 PM CDTSpecial Weather StatementDLHPrice34 min
Jul 27, 4:53 PM CDTSevere Thunderstorm WarningDLHBayfield, Douglas52 min
Jul 27, 5:30 PM CDTSpecial Weather StatementDLHDouglas45 min
Jul 27, 5:42 PM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Iron, Sawyer63 min
Jul 27, 5:49 PM CDTTornado WarningDLHAshland, Bayfield, Iron41 min
Jul 27, 6:45 PM CDTSevere Thunderstorm WarningDLHBurnett, Sawyer, Washburn45 min

Nearby

Tornado Warnings in Wisconsin, 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.