Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 207, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Sep 12, 2011, 2:33 PM CDT for Cook County, Minnesota. It was in force for 42 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
- Sep 12, 2011, 2:33 PM CDT (19:33 UTC)
- Expired
- Sep 12, 2011, 3:15 PM CDT
- In force
- 42 min
- Issued by
- NWS Duluth, MN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 70.0 mph
County Cook County, MN
The radar
The Duluth radar (KDLH), 166 km from the middle of the area, began a volume at 19:36 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 nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 7.6 hours before the alert went out and 221 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.
- Mixed-layer CAPE
- 1282 J/kg
- Mixed-layer CIN
- -118 J/kg
- Mixed-layer LCL
- 1276 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 272 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.5
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 Sep 12, 12:56 PM CDT, 1 hour 37 minutes earlier.
Area forecast discussion, Sep 12, 12:56 PM CDT, 1 hour 37 minutes before
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</html>Hazardous weather outlook, Sep 12, 9:25 AM CDT, 5 hours 8 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE DULUTH MN 925 AM CDT MON SEP 12 2011 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-131030- 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- 925 AM CDT MON SEP 12 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS WILL BE POSSIBLE OVER MUCH OF THE NORTHLAND TODAY...EXCEPT THE FAR SOUTHWEST. SOME OF THE STORMS MAY BE SEVERE...ESPECIALLY OVER THE ARROWHEAD...PORTIONS OF THE IRON RANGE...TWIN PORTS...AND A GOOD PORTION OF NORTHERN WISCONSIN THIS AFTERNOON AND EVENING. THE MAIN THREATS WILL LARGE HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A COLD AIR MASS WILL SETTLE IN OVER THE NORTHLAND DURING THE MIDDLE OF THE WEEK BRINGING NEAR OR BELOW FREEZING MORNING TEMPERATURES...AND AREAS OF FROST...WEDNESDAY AND THURSDAY. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON INTO THE EVENING. LSZ121-140>148-131030- 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- 925 AM CDT MON SEP 12 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF WESTERN LAKE SUPERIOR. .DAY ONE...TODAY AND TONIGHT WINDS OF 20 TO 30 KNOTS WILL BE COMMON THIS AFTERNOON AND EVENING. A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE ENTIRE NEARSHORE WATERS OF WESTERN LAKE SUPERIOR. THUNDERSTORMS WITH WINDS IN EXCESS OF 30 KNOTS ARE EXPECTED THIS AFTERNOON AND EVENING OVER THE WATERS OF LAKE SUPERIOR. A FEW OF THE STORMS WILL HAVE THE POTENTIAL TO BECOME SEVERE WITH DAMAGING WINDS AND LARGE HAIL. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A SMALL CRAFT ADVISORY REMAINS IN EFFECT FOR PERSISTENT GUSTY NORTHWEST WINDS AND HAZARDOUS WAVE CONDITIONS THROUGH TUESDAY NIGHT. KK 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, Sep 12, 1:22 PM CDT, 1 hour 11 minutes before
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</html>Special weather statement, Sep 12, 2:13 PM CDT, 20 minutes before
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</html>The office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 4:04 AM CDT | Small Craft Advisory | DLH | 65 hr | |
| Sep 12, 1:22 PM CDT | Special Weather Statement | DLH | Cook | 38 min |
| Sep 12, 2:13 PM CDT | Special Weather Statement | DLH | Cook | 62 min |
| Sep 12, 3:26 PM CDT | Special Weather Statement | DLH | Lake | 34 min |
| Sep 12, 3:40 PM CDT | Severe Thunderstorm Warning | DLH | Cook, Lake | 50 min |
| Sep 12, 4:15 PM CDT | Special Weather Statement | DLH | Carlton | 30 min |
| Sep 12, 4:17 PM CDT | Severe Thunderstorm Warning | DLH | Cook | 58 min |
| Sep 12, 4:21 PM CDT | Special Weather Statement | DLH | Lake | 24 min |
| Sep 12, 4:29 PM CDT | Special Weather Statement | DLH | Carlton | 16 min |
| Sep 12, 4:47 PM CDT | Special Marine Warning | DLH | 50 min | |
| Sep 12, 4:47 PM CDT | Severe Thunderstorm Warning | DLH | Saint Louis | 13 min |
| Sep 12, 4:49 PM CDT | Special Marine Warning | DLH | 26 min | |
| Sep 12, 4:56 PM CDT | Special Marine Warning | DLH | 49 min | |
| Sep 12, 5:23 PM CDT | Special Marine Warning | DLH | 52 min | |
| Sep 12, 4:41 PM CDT | Special Weather Statement | DLH | Douglas | 19 min |
| Sep 12, 4:45 PM CDT | Special Weather Statement | DLH | Douglas | 30 min |
| Sep 12, 5:02 PM CDT | Tornado Warning | DLH | Douglas | 18 min |
| Sep 12, 5:19 PM CDT | Severe Thunderstorm Warning | DLH | Bayfield, Douglas | 24 min |
| Sep 12, 5:31 PM CDT | Severe Thunderstorm Warning | DLH | Bayfield, Douglas | 29 min |
| Sep 12, 5:54 PM CDT | Special Weather Statement | DLH | Bayfield | 36 min |
| Sep 12, 6:00 PM CDT | Severe Thunderstorm Warning | DLH | Bayfield, Douglas, Sawyer | 45 min |
| Sep 12, 6:15 PM CDT | Special Weather Statement | DLH | Ashland, Iron | 60 min |
| Sep 12, 6:41 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield, Sawyer | 34 min |
| Sep 12, 6:50 PM CDT | Special Weather Statement | DLH | Iron | 25 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2011Every 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.