Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 6, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 5, 2021, 9:27 PM CDT for Lincoln County, Minnehaha County, South Dakota; Rock County, Minnesota; Lyon County, Iowa. It was in force for 33 min. 3 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
- Apr 5, 2021, 9:27 PM CDT (02:27 UTC)
- Expired
- Apr 5, 2021, 10:00 PM CDT
- In force
- 33 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Lyon County, IA, Rock County, MN, Lincoln County, SD, Minnehaha County, SD
The radar
The Sioux Falls radar (KFSD), 19 km from the middle of the area, began a volume at 02:28 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 |
|---|---|---|---|
| Apr 5, 9:27 PM CDT | HAIL 1.75 | 4 Ene Harrisburg, SD | LAKE ALVIN AREA. REPORTED VIA SOCIAL MEDIA. |
| Apr 5, 9:40 PM CDT | HAIL 1 | 1 E Larchwood, IA | REPORT RECEIVED VIA SOCIAL MEDIA. |
| Apr 5, 9:44 PM CDT | HAIL 1 | Larchwood, IA | REPORT VIA MPING. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 2.5 hours before the alert went out and 216 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3053 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -70 m²/s²
- 0-3 km storm-relative helicity
- 246 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
970
WUUS53 KFSD 060227
SVRFSD
IAC119-MNC133-SDC083-099-060300-
/O.NEW.KFSD.SV.W.0006.210406T0227Z-210406T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
927 PM CDT Mon Apr 5 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Northwestern Lyon County in northwestern Iowa...
Southwestern Rock County in southwestern Minnesota...
Southeastern Minnehaha County in southeastern South Dakota...
Northeastern Lincoln County in southeastern South Dakota...
* Until 1000 PM CDT.
* At 927 PM CDT, a severe thunderstorm was located over Lake Alvin
State Recreation Area, or 7 miles southeast of Sioux Falls, moving
northeast at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Public. At 920 PM, there were two reports of quarter
sized hail on the south side of Sioux Falls, near 85th
St. and Louise Ave.
IMPACT...Damage to vehicles is expected.
* This severe thunderstorm will be near...
Rowena around 940 PM CDT.
Larchwood around 945 PM CDT.
Valley Springs around 950 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4332 9679 4351 9678 4367 9640 4336 9637
TIME...MOT...LOC 0227Z 245DEG 25KT 4346 9663
HAIL...1.00IN
WIND...<50MPH
$$
SG1 follow-up statement
378
WWUS53 KFSD 060238
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
938 PM CDT Mon Apr 5 2021
IAC119-MNC133-SDC083-099-060300-
/O.CON.KFSD.SV.W.0006.000000T0000Z-210406T0300Z/
Lyon IA-Rock MN-Minnehaha SD-Lincoln SD-
938 PM CDT Mon Apr 5 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR NORTHWESTERN LYON...SOUTHWESTERN ROCK...SOUTHEASTERN MINNEHAHA
AND NORTHEASTERN LINCOLN COUNTIES...
At 937 PM CDT, a severe thunderstorm was located near Lake Alvin
State Recreation Area, or 11 miles north of Canton, moving east at 30
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Public.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe storm will be near...
Larchwood and Valley Springs around 950 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4333 9672 4355 9668 4367 9640 4336 9637
TIME...MOT...LOC 0237Z 249DEG 24KT 4346 9653
HAIL...1.00IN
WIND...60MPH
$$
SGThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 7:03 PM CDT | Severe Thunderstorm Warning | FSD | McCook, Minnehaha | 27 min |
| Apr 5, 7:39 PM CDT | Severe Thunderstorm Warning | FSD | Moody | 36 min |
| Apr 5, 7:49 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson, Turner | 26 min |
| Apr 5, 8:44 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 31 min |
| Apr 5, 9:04 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha, Turner | 26 min |
| Apr 5, 9:48 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 27 min |
| Apr 6, 9:39 AM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Gregory | 10 min |
| Apr 5, 10:07 PM CDT | Severe Thunderstorm Warning | FSD | Nobles, Rock | 53 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2021Severe Thunderstorm Warnings in Minnesota, 2021Severe Thunderstorm Warnings in Iowa, 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.