Alert archive / Minnesota / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 92, NWS Duluth, MN

August 8, 2015Cook County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Aug 8, 2015, 7:12 PM CDT for Cook County, Minnesota. It was in force for 33 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 8, 2015, 7:12 PM CDT (00:12 UTC)
Expired: Aug 8, 2015, 7:45 PM CDT
In force: 33 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Cook County, MN

The radar

The Duluth radar (KDLH), 166 km from the middle of the area, began a volume at 00:14 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 8, 3:25 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.2 hours before the alert went out and 405 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: 1498 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 951 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 9.7

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 8, 6:45 PM CDT, 27 minutes earlier.

Area forecast discussion, Aug 8, 6:45 PM CDT, 27 minutes before

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Hazardous weather outlook, Aug 8, 4:17 PM CDT, 2 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
417 PM CDT SAT AUG 8 2015

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-091030-
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-
417 PM CDT SAT AUG 8 2015

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

.DAY ONE...TONIGHT

STRONG TO SEVERE STORMS WILL CONTINUE OVER PORTIONS OF NORTHEAST
MINNESOTA THIS AFTERNOON INTO THE EVENING. FAR NORTHWEST WISCONSIN
MAY ALSO SEE A SEVERE STORM OR TWO THIS EVENING. THE MAIN THREATS
FROM THE STRONGEST STORMS WILL BE LARGE HAIL...DAMAGING WIND AND
HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS SLIGHT CHANCE OF THUNDERSTORMS MAINLY SOUTH OF HIGHWAY 2
ON SUNDAY AND MONDAY...AND THEN ACROSS MUCH OF THE AREA ON
THURSDAY AND FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS HAVE BEEN ACTIVATED OVER PORTIONS OF THE
NORTHLAND WITH ADDITIONAL ACTIVATION POSSIBLE THIS EVENING.

LSZ121-140>148-091030-
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-
417 PM CDT SAT AUG 8 2015

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

.DAY ONE...TONIGHT

THUNDERSTORMS WILL BE POSSIBLE OVER THE NEARSHORE WATERS LATE THIS
AFTERNOON INTO THE EVENING. A SEVERE STORM IS POSSIBLE OVER THE
FAR WESTERN AREAS. THE MAIN THREATS WILL BE LARGE HAIL AND
DAMAGING WIND.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS SLIGHT CHANCE OF THUNDERSTORMS OVER WESTERN LAKE
SUPERIOR ON SUNDAY AND MONDAY...AND THEN AGAIN ON THURSDAY AND
FRIDAY.

MELDE

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, Aug 8, 5:52 PM CDT, 1 hour 20 minutes before

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Special weather statement, Aug 8, 6:06 PM CDT, 1 hour 6 minutes before

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Local storm report, Aug 8, 6:30 PM CDT, 42 minutes before

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Special weather statement, Aug 8, 6:34 PM CDT, 38 minutes before

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Special weather statement, Aug 8, 6:48 PM CDT, 24 minutes before

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Local storm report, Aug 8, 6:55 PM 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 8, 7:08 PM CDT	Special Weather Statement	DLH	Carlton	22 min
Aug 8, 7:29 PM CDT	Special Weather Statement	DLH	Carlton	31 min
Aug 8, 7:33 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Carlton	27 min
Aug 8, 7:38 PM CDT	Severe Thunderstorm Warning	DLH	Cook	37 min
Aug 8, 7:47 PM CDT	Areal Flood Advisory	DLH	Lake, Saint Louis	3 hr
Aug 8, 8:13 PM CDT	Severe Thunderstorm Warning	DLH	Cook	11 min
Aug 8, 8:44 PM CDT	Special Weather Statement	DLH	Carlton	16 min
Aug 8, 9:09 PM CDT	Special Weather Statement	DLH	Carlton	36 min
Aug 8, 9:41 PM CDT	Special Weather Statement	DLH	Carlton	34 min
Aug 9, 5:04 AM CDT	Dense Fog Advisory	DLH	Aitkin, Carlton, Cass, Cook, Itasca, Lake and 1 more	6 hr
Aug 8, 7:00 PM CDT	Special Weather Statement	DLH	Douglas	30 min
Aug 8, 10:36 PM CDT	Special Weather Statement	DLH	Burnett	24 min
Aug 9, 12:39 PM CDT	Special Weather Statement	DLH	Burnett	21 min
Aug 9, 1:13 PM CDT	Special Weather Statement	DLH	Burnett	32 min
Aug 9, 2:51 PM CDT	Special Weather Statement	DLH	Ashland	24 min
Aug 9, 2:53 PM CDT	Special Weather Statement	DLH	Ashland	37 min
Aug 9, 3:17 PM CDT	Special Weather Statement	DLH	Ashland	28 min
Aug 9, 3:44 PM CDT	Special Weather Statement	DLH	Price	31 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2015 Every severe thunderstorm warning in 2015

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.