Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 121, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 4:49 PM CDT for Nobles County, Rock County, Minnesota. It was in force for 41 min. 6 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
- Aug 28, 2021, 4:49 PM CDT (21:49 UTC)
- Expired
- Aug 28, 2021, 5:30 PM CDT
- In force
- 41 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Possible
- Damage threat
- Considerable
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Nobles County, MN, Rock County, MN
The radar
The Sioux Falls radar (KFSD), 48 km from the middle of the area, began a volume at 21:50 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 |
|---|---|---|---|
| Aug 28, 4:57 PM CDT | TSTM WND GST 68 | 1 Wsw Beaver Creek, MN | DELAYED REPORT FROM BEAVER CREEK I-90 MP 4, MN. MN006. |
| Aug 28, 5:00 PM CDT | TSTM WND GST 61 | 3 Wsw Luverne, MN | DELAYED REPORT FROM MESONET STATION FW5856 LUVERNE. |
| Aug 28, 5:03 PM CDT | TSTM WND GST 61 | 1 Wsw Luverne, MN | DELAYED REPORT FROM PERSONAL WEATHER STATION JUST WEST OF LUVERNE, MN. |
| Aug 28, 5:23 PM CDT | TSTM WND DMG | Adrian, MN | STRONG WINDS KNOCKED TREES DOWN IN THE SOUTHERN PART OF ADRIAN. |
| Aug 28, 5:38 PM CDT | HAIL 1 | Hills, MN | DELAYED REPORT. MOST OF THE HAIL WAS DIMES OR SMALLER, BUT THERE WERE A FEW QUARTER-SIZED HAIL STONES. |
| Aug 28, 5:40 PM CDT | TSTM WND DMG | Hills, MN | DELAYED REPORT. TREES REPORTED DOWN, DIAMETER OF THE TRUNKS WAS 2-3 FEET. A POWER LINE WAS KNOCKED DOWN AS WELL, RESULTING IN POWER OUTAGE OF ABOUT 3 HOURS. |
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 |
|---|---|---|---|
| Aug 28, 3:44 PM CDT | Tornado Watch | SPC | 5 hr |
| Aug 28, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 9.8 hours before the alert went out and 231 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
- 9 J/kg
- Mixed-layer CIN
- -334 J/kg
- Mixed-layer LCL
- 1540 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 558 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted.
469
WUUS53 KFSD 282149
SVRFSD
MNC105-133-282230-
/O.NEW.KFSD.SV.W.0121.210828T2149Z-210828T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
449 PM CDT Sat Aug 28 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Rock County in southwestern Minnesota...
Southwestern Nobles County in southwestern Minnesota...
* Until 530 PM CDT.
* At 448 PM CDT, a severe thunderstorm was located over Valley
Springs, or 12 miles east of Sioux Falls, moving east at 40 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.
* This severe thunderstorm will be near...
Hills and Beaver Creek around 500 PM CDT.
Luverne around 510 PM CDT.
Blue Mounds State Park around 515 PM CDT.
Adrian and Lismore around 530 PM CDT.
Other locations impacted by this severe thunderstorm include Magnolia
and Steen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.
&&
LAT...LON 4350 9593 4350 9645 4373 9645 4375 9592
TIME...MOT...LOC 2148Z 262DEG 35KT 4360 9651
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
APT1 follow-up statement
098
WWUS53 KFSD 282205
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
505 PM CDT Sat Aug 28 2021
MNC105-133-282230-
/O.CON.KFSD.SV.W.0121.000000T0000Z-210828T2230Z/
Rock MN-Nobles MN-
505 PM CDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR ROCK AND SOUTHWESTERN NOBLES COUNTIES...
At 503 PM CDT, a severe thunderstorm was located near Beaver Creek,
or near Luverne, moving east at 40 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...At 5:00 pm, law enforcement reports wind speed of 60 miles
per hour.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
This severe storm will be near...
Luverne around 510 PM CDT.
Blue Mounds State Park around 515 PM CDT.
Adrian and Lismore around 530 PM CDT.
Other locations impacted by this severe thunderstorm include Magnolia
and Steen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4350 9593 4350 9645 4373 9645 4375 9592
TIME...MOT...LOC 2203Z 262DEG 35KT 4362 9630
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
APTThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 4:45 PM CDT | Tornado Warning | FSD | Rock | 30 min |
| Aug 28, 5:00 PM CDT | Severe Thunderstorm Warning | FSD | Nobles, Rock | 45 min |
| Aug 28, 5:06 PM CDT | Tornado Warning | FSD | Murray, Nobles, Pipestone, Rock | 24 min |
| Aug 28, 5:24 PM CDT | Tornado Warning | FSD | Nobles | 36 min |
| Aug 28, 5:26 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson, Murray, Nobles, Pipestone, Rock | 34 min |
| Aug 28, 5:26 PM CDT | Tornado Warning | FSD | Cottonwood, Murray | 34 min |
| Aug 28, 5:29 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson, Murray, Nobles, Pipestone, Rock | 31 min |
| Aug 28, 5:34 PM CDT | Severe Thunderstorm Warning | FSD | Rock | 17 min |
| Aug 28, 5:43 PM CDT | Tornado Warning | FSD | Cottonwood, Murray | 32 min |
| Aug 28, 5:45 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson, Murray, Nobles | 45 min |
| Aug 28, 5:49 PM CDT | Tornado Warning | FSD | Cottonwood, Jackson, Murray, Nobles | 26 min |
| Aug 28, 6:01 PM CDT | Tornado Warning | FSD | Cottonwood | 30 min |
| Aug 28, 6:15 PM CDT | Severe Thunderstorm Warning | FSD | Pipestone, Rock | 45 min |
| Aug 28, 6:53 PM CDT | Severe Thunderstorm Warning | FSD | Rock | 52 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.