Alert archive / Minnesota / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 98, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Aug 12, 2015, 8:15 PM CDT for Cass County, Crow Wing County, Minnesota. It was in force for 60 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 12, 2015, 8:15 PM CDT (01:15 UTC)
- Expired
- Aug 12, 2015, 9:15 PM CDT
- In force
- 60 min
- Issued by
- NWS Duluth, MN
- Area
- Storm-based polygon
- Hail
- 2.0 in
- Wind
- 60.0 mph
Counties Cass County, MN, Crow Wing County, MN
The radar
The Duluth radar (KDLH), 152 km from the middle of the area, began a volume at 01:16 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 |
|---|---|---|---|
| Aug 12, 3:33 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 1.3 hours before the alert went out and 213 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
- 183 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 1528 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 12, 7:22 PM CDT, 53 minutes earlier.
Area forecast discussion, Aug 12, 7:22 PM CDT, 53 minutes before
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</html>Hazardous weather outlook, Aug 12, 3:51 PM CDT, 4 hours 24 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DULUTH MN 351 PM CDT WED AUG 12 2015 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-131200- 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- 351 PM CDT WED AUG 12 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED LATE THIS AFTERNOON AND INTO EARLY THURSDAY AS A TROUGH BOUNDARY MOVES OUT OF CANADA AND NORTHWEST MINNESOTA INTO THE NORTHLAND. STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS THE NORTHLAND THROUGH TONIGHT. THE GREATEST RISK OF SEVERE WEATHER IS ACROSS PARTS OF NORTH CENTRAL AND CENTRAL MINNESOTA...WHICH IS WHERE A SEVERE THUNDERSTORM WATCH IS IN EFFECT THROUGH LATE THIS EVENING. STORMS COULD BE CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WINDS...AND HEAVY RAIN. LOCALIZED FLOODING IS POSSIBLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE COULD BE LINGERING STORMS ACROSS NORTHWEST WISCONSIN EARLY THURSDAY. THUNDERSTORMS ARE POSSIBLE ACROSS NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN THURSDAY NIGHT INTO EARLY FRIDAY. A COLD FRONT COULD BRING THUNDERSTORMS THROUGH NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN SATURDAY NIGHT AND SUNDAY. THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTERS MAY BE NEEDED THROUGH TONIGHT...ESPECIALLY ACROSS PARTS OF NORTH CENTRAL AND CENTRAL MINNESOTA...WHICH HAS THE THE GREATEST RISK OF SEVERE WEATHER. SPOTTERS ARE ENCOURAGED TO REPORT HAIL...GUSTY WINDS...AND RAINFALL WITH ANY THUNDERSTORMS. LSZ121-140>148-131200- 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- 351 PM CDT WED AUG 12 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NEARSHORE WATERS OF WESTERN LAKE SUPERIOR. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS ARE POSSIBLE ACROSS WESTERN LAKE SUPERIOR TONIGHT INTO EARLY THURSDAY. SOME STORMS COULD BE STRONG TO SEVERE AND CAPABLE OF PRODUCING LARGE HAIL AND STRONG GUSTS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORMS ARE POSSIBLE ACROSS WESTERN LAKE SUPERIOR THURSDAY NIGHT AND EARLY FRIDAY...SATURDAY NIGHT AND SUNDAY...AS WELL AS MONDAY AND TUESDAY. GROCHOCINSKI 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 12, 6:17 PM CDT, 1 hour 58 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
617 PM CDT WED AUG 12 2015
MNZ025-033-122345-
SOUTH CASS-NORTH CASS-
617 PM CDT WED AUG 12 2015
...ROBUST THUNDERSTORM APPROACHING CASS COUNTY...
AT 615 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
10 MILES SOUTHEAST OF LAVINIA TO 9 MILES SOUTHWEST OF LAKE GEORGE...
AND MOVING SOUTH AT 50 MPH.
WIND GUSTS UP TO 55 MPH...NICKEL SIZE HAIL...HEAVY DOWNPOURS...AND
NEARLY CONTINUOUS CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH
THESE STORMS. A WARNING MAY BE NEEDED IN THE FUTURE IF THE CORE OF
THE STORM TRACKS FURTHER TO THE EAST.
LOCATIONS IMPACTED INCLUDE...
WALKER...HACKENSACK...LEECH LAKE...CASS LAKE...OSHAWA...WILKINSON...
TEN MILE LAKE...WHIPHOLT...PHEASANT LAKE...BREVIK AND WEBB LAKE.
SEEK SHELTER INSIDE A STURDY BUILDING AND AWAY FROM WINDOWS UNTIL
THESE STORMS PASS.
IF YOU ARE ON OR NEAR ONE OF THE MANY AREA LAKES...GET OFF OF THE
WATER IMMEDIATELY AND SEEK SHELTER ON SHORE INSIDE A STURDY BUILDING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT FOR
NORTH CENTRAL MINNESOTA.
LAT...LON 4680 9479 4680 9466 4740 9467 4741 9448
4706 9419 4668 9478
TIME...MOT...LOC 2315Z 337DEG 44KT 4743 9463 4710 9515
MCLOVINThe office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 7:29 PM CDT | Severe Thunderstorm Warning | DLH | Cass, Crow Wing | 46 min |
| Aug 12, 8:39 PM CDT | Special Weather Statement | DLH | Koochiching | 21 min |
| Aug 12, 9:14 PM CDT | Severe Thunderstorm Warning | DLH | Crow Wing | 16 min |
| Aug 12, 9:38 PM CDT | Special Weather Statement | DLH | Koochiching | 22 min |
| Aug 12, 10:23 PM CDT | Special Weather Statement | DLH | Koochiching | 22 min |
| Aug 12, 10:45 PM CDT | Special Weather Statement | DLH | Koochiching | 15 min |
| Aug 12, 10:49 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching | 26 min |
| Aug 12, 11:04 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching, Saint Louis | 41 min |
| Aug 12, 11:20 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching | 25 min |
| Aug 12, 11:35 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching, Saint Louis | 40 min |
| Aug 12, 11:41 PM CDT | Special Weather Statement | DLH | Cass | 19 min |
| Aug 12, 11:56 PM CDT | Special Weather Statement | DLH | Cass | 34 min |
| Aug 13, 12:15 AM CDT | Special Weather Statement | DLH | Saint Louis | 30 min |
| Aug 13, 12:31 AM CDT | Special Weather Statement | DLH | Cass | 14 min |
| Aug 13, 12:45 AM CDT | Special Weather Statement | DLH | Saint Louis | 30 min |
| Aug 13, 12:47 AM CDT | Special Weather Statement | DLH | Crow Wing | 28 min |
| Aug 13, 1:11 AM CDT | Special Weather Statement | DLH | Saint Louis | 34 min |
| Aug 13, 1:12 AM CDT | Special Weather Statement | DLH | Crow Wing | 18 min |
| Aug 13, 1:30 AM CDT | Special Weather Statement | DLH | Crow Wing | 15 min |
| Aug 13, 1:46 AM CDT | Special Weather Statement | DLH | Crow Wing | 29 min |
| Aug 13, 4:16 AM CDT | Special Weather Statement | DLH | Pine | 14 min |
| Aug 13, 4:57 AM CDT | Special Weather Statement | DLH | Pine | 18 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2015Every 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.