Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 7, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 5, 2021, 9:48 PM CDT for Lyon County, Iowa; Minnehaha County, South Dakota; Rock County, Minnesota. It was in force for 27 min. 2 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, 9:48 PM CDT (02:48 UTC)
- Expired
- Apr 5, 2021, 10:15 PM CDT
- In force
- 27 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Lyon County, IA, Rock County, MN, Minnehaha County, SD
The radar
The Sioux Falls radar (KFSD), 36 km from the middle of the area, began a volume at 02:52 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, 9:50 PM CDT | HAIL 0.75 | 2 Ese Lester, IA | |
| Apr 5, 10:02 PM CDT | HAIL 1.25 | 1 Ssw Rock Rapids, IA |
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, 2.8 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
- 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.
608
WUUS53 KFSD 060248
SVRFSD
IAC119-MNC133-SDC099-060315-
/O.NEW.KFSD.SV.W.0007.210406T0248Z-210406T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
948 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...
Southern Rock County in southwestern Minnesota...
Southeastern Minnehaha County in southeastern South Dakota...
* Until 1015 PM CDT.
* At 947 PM CDT, a severe thunderstorm was located over Larchwood, or
11 miles west of Rock Rapids, moving east at 25 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Rock Rapids around 1005 PM CDT.
Other locations impacted by this severe thunderstorm include Steen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4334 9647 4352 9652 4362 9616 4338 9607
TIME...MOT...LOC 0247Z 251DEG 23KT 4346 9639
HAIL...1.25IN
WIND...60MPH
$$
SG1 follow-up statement
010
WWUS53 KFSD 060303
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1003 PM CDT Mon Apr 5 2021
SDC099-060313-
/O.CAN.KFSD.SV.W.0007.000000T0000Z-210406T0315Z/
Minnehaha SD-
1003 PM CDT Mon Apr 5 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MINNEHAHA COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4335 9639 4357 9635 4362 9616 4338 9607
TIME...MOT...LOC 0303Z 260DEG 26KT 4345 9618
$$
IAC119-MNC133-060315-
/O.CON.KFSD.SV.W.0007.000000T0000Z-210406T0315Z/
Lyon IA-Rock MN-
1003 PM CDT Mon Apr 5 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTH CENTRAL LYON AND SOUTHEASTERN ROCK COUNTIES...
At 1003 PM CDT, a severe thunderstorm was located over Rock Rapids,
moving east at 30 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Public. At 950 PM, quarter sized hail was reported at
Larchwood.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of north
central Lyon and southeastern Rock Counties, including the following
locations... Steen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4335 9639 4357 9635 4362 9616 4338 9607
TIME...MOT...LOC 0303Z 260DEG 26KT 4345 9618
HAIL...1.25IN
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, 9:27 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 33 min |
| Apr 5, 10:07 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola | 53 min |
| 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 6, 9:39 AM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Gregory | 10 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in South Dakota, 2021Severe 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.