Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 116, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 27, 2021, 2:00 AM CDT for Buena Vista County, Iowa. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2021, 2:00 AM CDT (07:00 UTC)
- Expired
- Aug 27, 2021, 3:00 AM CDT
- In force
- 60 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Buena Vista County, IA
The radar
The Sioux Falls radar (KFSD), 159 km from the middle of the area, began a volume at 06:58 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.
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 26, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 7.0 hours before the alert went out and 181 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
- 5342 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1163 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 3.8
- Supercell composite
- 24.0
The text
As transmitted.
657 WUUS53 KFSD 270700 SVRFSD IAC021-270800- /O.NEW.KFSD.SV.W.0116.210827T0700Z-210827T0800Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Sioux Falls SD 200 AM CDT Fri Aug 27 2021 The National Weather Service in Sioux Falls has issued a * Severe Thunderstorm Warning for... Buena Vista County in northwestern Iowa... * Until 300 AM CDT. * At 200 AM CDT, severe thunderstorms were located along a line extending from near Larrabee to near Aurelia to near Holstein, moving east at 45 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Severe thunderstorms will be near... Alta around 215 AM CDT. Storm Lake around 220 AM CDT. Other locations in the path of these severe thunderstorms include Linn Grove, Truesdale, Sioux Rapids, Lakeside, Newell, Albert City and Marathon. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4256 9539 4290 9538 4289 9491 4256 9492 TIME...MOT...LOC 0700Z 260DEG 38KT 4289 9556 4270 9551 4253 9557 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Weisser
2 follow-up statements
828 WWUS53 KFSD 270723 SVSFSD Severe Weather Statement National Weather Service Sioux Falls SD 223 AM CDT Fri Aug 27 2021 IAC021-270800- /O.CON.KFSD.SV.W.0116.000000T0000Z-210827T0800Z/ Buena Vista IA- 223 AM CDT Fri Aug 27 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT FOR BUENA VISTA COUNTY... At 223 AM CDT, severe thunderstorms were located along a line extending from Peterson to near Truesdale to 6 miles northeast of Galva, moving east at 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Truesdale, Sioux Rapids, Lakeside, Newell, Albert City and Marathon. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4256 9539 4290 9538 4289 9491 4256 9492 TIME...MOT...LOC 0723Z 263DEG 33KT 4292 9531 4273 9526 4256 9532 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Weisser
147
WWUS53 KFSD 270752
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
252 AM CDT Fri Aug 27 2021
IAC021-270802-
/O.EXP.KFSD.SV.W.0116.000000T0000Z-210827T0800Z/
Buena Vista IA-
252 AM CDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR BUENA VISTA COUNTY WILL EXPIRE
AT 300 AM CDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
northwestern and west central Iowa.
LAT...LON 4256 9539 4290 9538 4289 9491 4256 9492
TIME...MOT...LOC 0752Z 260DEG 38KT 4297 9492 4278 9487 4261 9493
$$
WeisserThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 12:17 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 28 min |
| Aug 27, 12:34 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 41 min |
| Aug 27, 1:04 AM CDT | Tornado Warning | FSD | Sioux | 26 min |
| Aug 27, 1:09 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux | 51 min |
| Aug 27, 1:25 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, Plymouth, Woodbury | 50 min |
| Aug 27, 1:52 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, Dickinson, O'Brien, Osceola | 68 min |
Nearby
Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.