Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 171, NWS Duluth, MN

August 2, 20115 counties in Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Aug 2, 2011, 2:38 AM CDT for 5 counties in Wisconsin. It was in force for 67 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: Aug 2, 2011, 2:38 AM CDT (07:38 UTC)
Expired: Aug 2, 2011, 3:45 AM CDT
In force: 67 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bayfield County, WI, Burnett County, WI, Douglas County, WI, Sawyer County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 87 km from the middle of the area, began a volume at 07:42 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
Aug 1, 10:35 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 2, 2:20 AM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.6 hours before the alert went out and 208 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: 3 J/kg
Mixed-layer CIN: -595 J/kg
Mixed-layer LCL: 1515 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 308 m²/s²
0-3 km storm-relative helicity: 808 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.9

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 Aug 2, 1:40 AM CDT, 58 minutes earlier.

Area forecast discussion, Aug 2, 1:40 AM CDT, 58 minutes before

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Hazardous weather outlook, Aug 1, 3:52 PM CDT, 10 hours 46 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
352 PM CDT MON AUG 1 2011

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-021030-
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-
352 PM CDT MON AUG 1 2011

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS ARE EXPECTED TO DEVELOP AND INCREASE IN COVERAGE
ACROSS THE NORTHLAND LATE THIS AFTERNOON AND TONIGHT. SOME OF THE
STORMS MAY BE SEVERE WITH DAMAGING WINDS AND LARGE HAIL. THE
STORMS MAY ALSO PRODUCE FLASH FLOODING. A FLASH FLOOD WATCH IS IN
EFFECT FOR THE ENTIRE AREA OVERNIGHT. SEE THE LATEST FLOOD WATCH
PRODUCTS FOR MORE INFORMATION.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE FLASH FLOOD WATCH WILL CONTINUE THROUGH MIDDAY TUESDAY. THERE
IS A CHANCE OF THUNDERSTORMS TUESDAY...AND AGAIN FROM THURSDAY
THROUGH MONDAY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND
TONIGHT.

LSZ121-140>148-021030-
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-
352 PM CDT MON AUG 1 2011

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS ARE EXPECTED TO DEVELOP AND INCREASE IN COVERAGE
ACROSS THE NORTHLAND LATE THIS AFTERNOON AND TONIGHT. SOME OF THE
STORMS MAY BE SEVERE WITH DAMAGING WINDS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE
IS A CHANCE OF THUNDERSTORMS TUESDAY...AND AGAIN FROM THURSDAY
THROUGH MONDAY.

DAP

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, Aug 2, 1:16 AM CDT, 1 hour 22 minutes before

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Special weather statement, Aug 2, 1:30 AM CDT, 1 hour 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
130 AM CDT TUE AUG 2 2011

MNZ033>036-020700-
CROW WING-NORTHERN AITKIN-SOUTH AITKIN-SOUTH CASS-
130 AM CDT TUE AUG 2 2011

...THUNDERSTORMS WITH HEAVY RAIN OCCURRING...

AT 124 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES NORTHEAST OF
BALSAM TO 6 MILES WEST OF LENNOX...MOVING EAST AT 30 MPH.

THESE STORMS ARE CAPABLE OF PRODUCING WIND GUSTS UP TO 30
MPH...FREQUENT CLOUD TO GROUND LIGHTNING...WITH HEAVY DOWNPOURS WITH
RAINFALL RATES OF 1 TO 2 INCHES IN A HOUR.

LOCATIONS IMPACTED INCLUDE...
  BIG SANDY LAKE...     AITKIN...  BALSAM...
  SOUTH LONG LAKE...    BAY LAKE...  ROSSBURG...
  RICE LAKE...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.

LAT...LON 4701 9311 4676 9308 4620 9310 4617 9343
      4624 9344 4624 9380 4615 9382 4615 9399
      4625 9437 4628 9435 4632 9442 4629 9455
      4635 9466 4634 9473 4638 9478

STEWART

Special weather statement, Aug 2, 1:33 AM CDT, 1 hour 5 minutes before

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Special weather statement, Aug 2, 1:51 AM CDT, 47 minutes before

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Special weather statement, Aug 2, 2:11 AM CDT, 27 minutes before

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Special weather statement, Aug 2, 2:21 AM CDT, 17 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
Aug 1, 8:20 PM CDT	Special Weather Statement	DLH	Aitkin	40 min
Aug 1, 8:49 PM CDT	Special Weather Statement	DLH	Crow Wing	26 min
Aug 1, 9:03 PM CDT	Special Weather Statement	DLH	Aitkin	12 min
Aug 1, 9:22 PM CDT	Special Weather Statement	DLH	Aitkin	23 min
Aug 1, 9:27 PM CDT	Special Weather Statement	DLH	Itasca	33 min
Aug 1, 9:29 PM CDT	Special Weather Statement	DLH	Pine	16 min
Aug 1, 9:52 PM CDT	Special Weather Statement	DLH	Carlton	23 min
Aug 1, 9:54 PM CDT	Special Weather Statement	DLH	Itasca	36 min
Aug 1, 10:08 PM CDT	Special Weather Statement	DLH	Aitkin	37 min
Aug 1, 10:12 PM CDT	Special Weather Statement	DLH	Carlton	18 min
Aug 1, 10:30 PM CDT	Special Weather Statement	DLH	Carlton	30 min
Aug 1, 10:33 PM CDT	Special Weather Statement	DLH	Cass	42 min
Aug 1, 10:46 PM CDT	Special Weather Statement	DLH	Carlton	29 min
Aug 1, 10:48 PM CDT	Special Weather Statement	DLH	Itasca	42 min
Aug 1, 10:59 PM CDT	Flash Flood Warning	DLH	Aitkin, Cass, Crow Wing, Itasca	6 hr
Aug 1, 11:18 PM CDT	Special Weather Statement	DLH	Koochiching	27 min
Aug 1, 11:31 PM CDT	Special Weather Statement	DLH	Saint Louis	29 min
Aug 1, 11:47 PM CDT	Special Weather Statement	DLH	Itasca	28 min
Aug 2, 12:10 AM CDT	Special Weather Statement	DLH	Carlton	35 min
Aug 2, 12:25 AM CDT	Special Weather Statement	DLH	Cass, Itasca	35 min
Aug 2, 12:40 AM CDT	Flash Flood Warning	DLH	Carlton, Saint Louis	4 hr
Aug 2, 12:52 AM CDT	Special Weather Statement	DLH	Saint Louis	23 min
Aug 2, 1:01 AM CDT	Special Weather Statement	DLH	Crow Wing	29 min
Aug 2, 1:16 AM CDT	Special Weather Statement	DLH	Saint Louis	29 min
Aug 2, 1:30 AM CDT	Special Weather Statement	DLH	Aitkin, Crow Wing	30 min
Aug 2, 1:39 AM CDT	Areal Flood Advisory	DLH	Saint Louis	3 hr
Aug 2, 1:51 AM CDT	Special Weather Statement	DLH	Carlton, Pine	24 min
Aug 2, 2:11 AM CDT	Special Weather Statement	DLH	Aitkin	34 min
Aug 2, 3:01 AM CDT	Special Weather Statement	DLH	Pine	29 min
Aug 2, 3:33 AM CDT	Special Weather Statement	DLH	Aitkin, Carlton	27 min
Aug 2, 3:41 AM CDT	Special Weather Statement	DLH	Pine	34 min
Aug 2, 4:07 AM CDT	Special Weather Statement	DLH	Aitkin, Carlton	23 min
Aug 2, 4:49 AM CDT	Special Weather Statement	DLH	Carlton	26 min
Aug 2, 5:11 AM CDT	Areal Flood Advisory	DLH	Carlton	3 hr
Aug 2, 6:33 AM CDT	Flash Flood Warning	DLH	Carlton, Pine	4 hr
Aug 2, 6:54 AM CDT	Areal Flood Advisory	DLH	Pine	6 hr
Aug 2, 8:27 AM CDT	Special Weather Statement	DLH	Pine	33 min
Aug 2, 11:06 AM CDT	Flash Flood Warning	DLH	Carlton, Pine	4 hr
Aug 2, 3:29 PM CDT	Areal Flood Warning	DLH	Carlton, Pine	24 hr
Aug 2, 3:47 PM CDT	Areal Flood Warning	DLH	Carlton, Pine	48 hr
Aug 1, 7:41 PM CDT	Special Weather Statement	DLH	Burnett, Washburn	34 min
Aug 1, 8:36 PM CDT	Special Weather Statement	DLH	Burnett, Washburn	39 min
Aug 1, 9:47 PM CDT	Special Weather Statement	DLH	Douglas	28 min
Aug 1, 10:13 PM CDT	Special Weather Statement	DLH	Washburn	47 min
Aug 1, 10:34 PM CDT	Special Weather Statement	DLH	Douglas	41 min
Aug 1, 11:00 PM CDT	Special Weather Statement	DLH	Douglas, Sawyer	60 min
Aug 2, 12:04 AM CDT	Special Weather Statement	DLH	Douglas	56 min
Aug 2, 12:49 AM CDT	Special Weather Statement	DLH	Douglas	41 min
Aug 2, 1:33 AM CDT	Special Weather Statement	DLH	Douglas	42 min
Aug 2, 1:43 AM CDT	Severe Thunderstorm Warning	DLH	Douglas	30 min
Aug 2, 2:21 AM CDT	Special Weather Statement	DLH	Douglas	39 min
Aug 2, 3:23 AM CDT	Severe Thunderstorm Warning	DLH	Ashland, Bayfield, Iron, Price, Sawyer	37 min
Aug 2, 3:56 AM CDT	Severe Thunderstorm Warning	DLH	Ashland, Iron, Price, Sawyer	49 min
Aug 2, 4:35 AM CDT	Special Weather Statement	DLH	Washburn	25 min
Aug 2, 4:54 AM CDT	Special Weather Statement	DLH	Price	36 min
Aug 2, 7:31 AM CDT	Special Weather Statement	DLH	Price, Sawyer, Washburn	59 min
Aug 2, 7:52 AM CDT	Special Weather Statement	DLH	Douglas	38 min
Aug 2, 8:49 AM CDT	Special Weather Statement	DLH	Washburn	26 min
Aug 2, 9:07 AM CDT	Special Weather Statement	DLH	Price	53 min
Aug 2, 9:13 AM CDT	Severe Thunderstorm Warning	DLH	Burnett, Washburn	47 min
Aug 2, 9:32 AM CDT	Special Weather Statement	DLH	Ashland, Iron	58 min
Aug 2, 9:34 AM CDT	Special Weather Statement	DLH	Ashland, Iron	56 min
Aug 2, 9:40 AM CDT	Special Weather Statement	DLH	Sawyer	35 min
Aug 2, 9:51 AM CDT	Severe Thunderstorm Warning	DLH	Sawyer, Washburn	39 min
Aug 2, 10:16 AM CDT	Flash Flood Warning	DLH	Price, Sawyer	6 hr
Aug 2, 10:24 AM CDT	Severe Thunderstorm Warning	DLH	Price, Sawyer	51 min
Aug 2, 3:24 PM CDT	Special Weather Statement	DLH	Price	51 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2011 Every 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.