Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 56, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 2021, 12:46 AM CDT for Sioux County, Iowa; Lincoln County, Union County, South Dakota. It was in force for 44 min. 1 report 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 9, 2021, 12:46 AM CDT (05:46 UTC)
- Expired
- Jul 9, 2021, 1:30 AM CDT
- In force
- 44 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Sioux County, IA, Lincoln County, SD, Union County, SD
The radar
The Sioux Falls radar (KFSD), 45 km from the middle of the area, began a volume at 05:50 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 |
|---|---|---|---|
| Jul 9, 1:22 AM CDT | HAIL 1 | 4 N Hawarden, IA | REPORT VIA SOCIAL MEDIA. |
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 8, 9:33 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 5.8 hours before the alert went out and 209 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
- 155 J/kg
- Mixed-layer CIN
- -474 J/kg
- Mixed-layer LCL
- 1131 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 406 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
346
WUUS53 KFSD 090546
SVRFSD
IAC167-SDC083-127-090630-
/O.NEW.KFSD.SV.W.0056.210709T0546Z-210709T0630Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1246 AM CDT Fri Jul 9 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Northwestern Sioux County in northwestern Iowa...
Southern Lincoln County in southeastern South Dakota...
Northeastern Union County in southeastern South Dakota...
* Until 130 AM CDT.
* At 1245 AM CDT, a severe thunderstorm was located 7 miles east of
Davis, or 11 miles north of Beresford, moving southeast at 35 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* This severe thunderstorm will be near...
Newton Hills State Park around 110 AM CDT.
Hudson around 120 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4319 9693 4323 9693 4330 9687 4314 9620
4303 9656
TIME...MOT...LOC 0545Z 297DEG 30KT 4324 9685
HAIL...1.00IN
WIND...<50MPH
$$
APT1 follow-up statement
902
WWUS53 KFSD 090627
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
127 AM CDT Fri Jul 9 2021
IAC167-SDC083-127-090637-
/O.EXP.KFSD.SV.W.0056.000000T0000Z-210709T0630Z/
Sioux IA-Lincoln SD-Union SD-
127 AM CDT Fri Jul 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SIOUX...SOUTHERN
LINCOLN AND NORTHEASTERN UNION COUNTIES WILL EXPIRE AT 130 AM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However small hail
and heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
northwestern Iowa...and southeastern South Dakota.
LAT...LON 4319 9693 4323 9693 4330 9687 4314 9620
4303 9656
TIME...MOT...LOC 0627Z 297DEG 30KT 4309 9645
$$
APTThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 11:45 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 45 min |
| Jul 8, 11:50 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 40 min |
| Jul 9, 12:29 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth | 46 min |
| Jul 9, 12:44 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 46 min |
| Jul 9, 2:15 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 45 min |
| Jul 8, 10:53 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Hutchinson, Turner, Yankton | 52 min |
| Jul 8, 10:56 PM CDT | Severe Thunderstorm Warning | FSD | Yankton | 19 min |
| Jul 8, 11:11 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Yankton | 34 min |
| Jul 8, 11:21 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Hutchinson, Lincoln, Turner, Yankton | 39 min |
| Jul 8, 11:59 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln, Turner, Union | 46 min |
| Jul 9, 1:22 AM CDT | Severe Thunderstorm Warning | FSD | Aurora, Davison, Jerauld, Sanborn | 38 min |
| Jul 9, 2:34 AM CDT | Severe Thunderstorm Warning | FSD | Hanson, Lake, McCook, Miner | 41 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 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.