Alert archive / Wisconsin / Tornado Warnings in 2010

Tornado Warning 30, NWS Duluth, MN

July 27, 2010Iron County, Wisconsin

NWS Duluth, MN issued this tornado warning at Jul 27, 2010, 7:13 PM CDT for Iron County, Wisconsin. It was in force for 16 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, 7:13 PM CDT (00:13 UTC)
Expired: Jul 27, 2010, 7:29 PM CDT
In force: 16 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon

County Iron County, WI

The radar

The Duluth radar (KDLH), 160 km from the middle of the area, began a volume at 00:16 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.

Issued	Product	Office	Lasted
Jul 27, 3:29 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.2 hours before the alert went out and 265 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1763 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 965 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 185 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 8.6

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, 46 minutes earlier.

Area forecast discussion, Jul 27, 6:27 PM CDT, 46 minutes before

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Hazardous weather outlook, Jul 27, 3:54 PM CDT, 3 hours 19 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, 6:18 PM CDT, 55 minutes before

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Local storm report, Jul 27, 6:19 PM CDT, 54 minutes before

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Local storm report, Jul 27, 6:25 PM CDT, 48 minutes before

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Local storm report, Jul 27, 6:30 PM CDT, 43 minutes before

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Local storm report, Jul 27, 6:32 PM CDT, 41 minutes before

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Local storm report, Jul 27, 6:55 PM CDT, 18 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 7:45 PM CDT	Areal Flood Advisory	DLH	Pine	3 hr
Jul 27, 7:01 PM CDT	Special Weather Statement	DLH	Burnett	14 min
Jul 27, 7:14 PM CDT	Tornado Warning	DLH	Ashland, Iron, Price	39 min
Jul 27, 7:39 PM CDT	Severe Thunderstorm Warning	DLH	Price, Sawyer, Washburn	66 min
Jul 27, 8:44 PM CDT	Severe Thunderstorm Warning	DLH	Price	31 min

Nearby

Tornado Warnings in Wisconsin, 2010 Every tornado warning in 2010 Tornadoes 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.