Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 21, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Jul 23, 2021, 6:28 PM CDT for Cook County, Lake County, Saint Louis County, Minnesota. It was in force for 62 min. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 23, 2021, 6:28 PM CDT (23:28 UTC)
- Expired
- Jul 23, 2021, 7:30 PM CDT
- In force
- 62 min
- Issued by
- NWS Duluth, MN
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 70.0 mph
Counties Cook County, MN, Lake County, MN, Saint Louis County, MN
The radar
The Duluth radar (KDLH), 145 km from the middle of the area, began a volume at 23:28 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 23, 6:41 PM CDT | TSTM WND DMG | 10 Nnw Soudan, MN | MULTIPLE CANOES FLIPPED OVER FROM THUNDERSTORM WIND GUSTS ON TROUT LAKE. CREW OF ONE CANOE UNACCOUNTED FOR. ADDITIONAL WATER EMERGENCIES ONGOING IN OTHER PORTIONS OF THE BOUNDARY WATERS CANOE AREA. |
| Jul 23, 6:46 PM CDT | TSTM WND DMG | Ely, MN | NUMEROUS REPORTS OF TREES DOWN IN ELY WITH MULTIPLE ROADS BLOCKED. TIME ESTIMATED BY RADAR. |
| Jul 23, 6:46 PM CDT | TSTM WND DMG | Ely, MN | PHOTO AND REPORT RECEIVED VIA SOCIAL MEDIA OF TREES DOWN AND DAMAGE TO TENTS AT A FESTIVAL IN DOWNTOWN ELY. TIME ESTIMATED BY RADAR. |
| Jul 23, 6:47 PM CDT | TSTM WND DMG | Ely, MN | PHOTOS AND MEASUREMENTS WERE RECEIVED FROM THE DAMAGED TREES IN WHITESIDE PARK. THE TWO LARGEST TREES WERE ELMS. ONE WAS UPROOTED AND HAD A DIAMETER OF 1 FOOT AT THE BASE OF THE TRUNK. THE SECOND TREE WAS 27 INCHES IN DIAMETER AND WAS COMPLETELY SNAPPED OFF AB |
| Jul 23, 7:00 PM CDT | TSTM WND GST 56 | 5 Wnw Tower, MN | A PERSONAL WEATHER STATION ON THE SOUTH SHORE OF LAKE VERMILION REPORTED A GUST TO 55.5 MPH. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 23, 4:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 11.5 hours before the alert went out and 134 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
- 470 J/kg
- Mixed-layer CIN
- -131 J/kg
- Mixed-layer LCL
- 725 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
093
WUUS53 KDLH 232328
SVRDLH
MNC031-075-137-240030-
/O.NEW.KDLH.SV.W.0021.210723T2328Z-210724T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Duluth MN
628 PM CDT Fri Jul 23 2021
The National Weather Service in Duluth MN has issued a
* Severe Thunderstorm Warning for...
West central Cook County in northeastern Minnesota...
Northeastern St. Louis County in northeastern Minnesota...
Northern Lake County in northeastern Minnesota...
* Until 730 PM CDT.
* At 627 PM CDT, severe thunderstorms were located along a line
extending from Boundary Waters Canoe Area Wilderness northwest of
Ely, to 11 miles northwest of Burntside Lake, to near Lake
Vermilion, moving east at 50 mph.
HAZARD...70 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Severe thunderstorms will be near...
Burntside Lake around 645 PM CDT.
Other locations in the path of these severe thunderstorms include
Ely, Winton, Robinson, White Iron Lake, Fall Lake, Basswood Lake,
Snowbank Lake, Birch Lake, Babbitt, Forest Center and Little Saganaga
Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail, damaging winds, and continuous cloud-to-ground lightning
is occurring with these storms. Move indoors immediately. Lightning
is one of nature's leading killers. Remember, if you can hear
thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4832 9206 4823 9195 4824 9190 4821 9186
4820 9172 4812 9171 4810 9156 4805 9157
4807 9149 4805 9142 4808 9126 4811 9120
4802 9085 4778 9114 4761 9152 4793 9270
TIME...MOT...LOC 2327Z 287DEG 42KT 4814 9205 4803 9220 4792 9245
HAIL...0.88IN
WIND...70MPH
$$
Unruh/Huyck3 follow-up statements
790
WWUS53 KDLH 232347
SVSDLH
Severe Weather Statement
National Weather Service Duluth MN
647 PM CDT Fri Jul 23 2021
MNC031-075-137-240030-
/O.CON.KDLH.SV.W.0021.000000T0000Z-210724T0030Z/
Cook MN-St. Louis MN-Lake MN-
647 PM CDT Fri Jul 23 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR WEST CENTRAL COOK...EAST CENTRAL ST. LOUIS AND NORTHERN LAKE
COUNTIES...
At 646 PM CDT, severe thunderstorms were located along a line
extending from Boundary Waters Canoe Area Wilderness near Ely, to
near Winton, to Burntside Lake, to near Robinson, moving east at 50
mph.
HAZARD...70 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Ely, Winton, White Iron Lake, Fall Lake, Birch Lake, Babbitt,
Basswood Lake, Snowbank Lake and Forest Center.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud-to-ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4787 9246 4825 9199 4825 9197 4823 9195
4824 9191 4824 9189 4821 9186 4820 9172
4812 9171 4810 9156 4805 9157 4807 9149
4805 9142 4808 9126 4811 9120 4802 9085
4778 9114 4761 9152
TIME...MOT...LOC 2346Z 290DEG 45KT 4807 9182 4796 9186 4791 9196 4788
9209
HAIL...0.88IN
WIND...70MPH
$$
Unruh/Huyck865
WWUS53 KDLH 240005
SVSDLH
Severe Weather Statement
National Weather Service Duluth MN
705 PM CDT Fri Jul 23 2021
MNC031-075-137-240030-
/O.CON.KDLH.SV.W.0021.000000T0000Z-210724T0030Z/
Cook MN-St. Louis MN-Lake MN-
705 PM CDT Fri Jul 23 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR WEST CENTRAL COOK...EAST CENTRAL ST. LOUIS AND NORTHERN LAKE
COUNTIES...
At 703 PM CDT, severe thunderstorms were located along a line
extending from Boundary Waters Canoe Area Wilderness near Ely, to 9
miles southeast of White Iron Lake, to near Birch Lake, moving east
at 50 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
Snowbank Lake and Forest Center.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on one of the many area lakes, get away from the water and move
indoors or inside a vehicle. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
&&
LAT...LON 4778 9214 4781 9222 4792 9195 4811 9164
4810 9156 4805 9157 4807 9149 4805 9142
4808 9126 4811 9120 4802 9085 4778 9114
4761 9152
TIME...MOT...LOC 0003Z 288DEG 45KT 4801 9155 4779 9165 4773 9192
HAIL...1.00IN
WIND...70MPH
$$
Unruh/Huyck889
WWUS53 KDLH 240023
SVSDLH
Severe Weather Statement
National Weather Service Duluth MN
723 PM CDT Fri Jul 23 2021
MNC031-075-137-240030-
/O.CON.KDLH.SV.W.0021.000000T0000Z-210724T0030Z/
Cook MN-St. Louis MN-Lake MN-
723 PM CDT Fri Jul 23 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR WEST CENTRAL COOK...NORTHEASTERN ST. LOUIS AND NORTHERN LAKE
COUNTIES...
At 722 PM CDT, severe thunderstorms were located along a line
extending from Boundary Waters Canoe Area Wilderness near Snowbank
Lake, to near Forest Center, to 9 miles southeast of Birch Lake,
moving east at 50 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
Babbitt, Birch Lake, Snowbank Lake, southern Boundary Waters Canoe
Area Wilderness, Forest Center, Little Saganaga Lake, White Iron
Lake, Basswood Lake, Ensign Lake, Kekekabic Lake, Bald Eagle Lake,
Gabbro Lake, Alice Lake, Ojibway Lake, Kawishiwi Lake, Isabella Lake,
Disappointment Lake, Greenstone Lake, Lake Three, and Gabimichigami
Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on one of the many area lakes, get away from the water and move
indoors or inside a vehicle. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
&&
LAT...LON 4775 9200 4788 9174 4807 9150 4807 9149
4805 9142 4808 9126 4811 9120 4802 9085
4778 9114 4761 9152
TIME...MOT...LOC 0022Z 287DEG 42KT 4796 9128 4774 9138 4768 9165
HAIL...1.00IN
WIND...70MPH
$$
Unruh/HuyckThe office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 7:38 PM CDT | Heat Advisory | DLH | Pine | 23 hr |
| Jul 23, 3:44 PM CDT | Special Weather Statement | DLH | Koochiching | 16 min |
| Jul 23, 3:57 PM CDT | Special Weather Statement | DLH | Koochiching | 18 min |
| Jul 23, 4:11 PM CDT | Special Weather Statement | DLH | Koochiching | 19 min |
| Jul 23, 4:28 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching, Saint Louis | 62 min |
| Jul 23, 4:46 PM CDT | Special Weather Statement | DLH | Koochiching | 14 min |
| Jul 23, 4:50 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching | 22 min |
| Jul 23, 4:59 PM CDT | Severe Thunderstorm Warning | DLH | Itasca, Koochiching | 38 min |
| Jul 23, 5:34 PM CDT | Severe Thunderstorm Warning | DLH | Itasca | 45 min |
| Jul 23, 5:42 PM CDT | Special Weather Statement | DLH | 18 min | |
| Jul 23, 6:05 PM CDT | Special Weather Statement | DLH | 25 min | |
| Jul 23, 6:35 PM CDT | Special Weather Statement | DLH | Itasca | 25 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.