Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 43, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 5, 2021, 8:24 PM CDT for 4 counties in Iowa. It was in force for 66 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
- Jul 5, 2021, 8:24 PM CDT (01:24 UTC)
- Expired
- Jul 5, 2021, 9:30 PM CDT
- In force
- 66 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Clay County, IA, Dickinson County, IA, O'Brien County, IA, Osceola County, IA
The radar
The Sioux Falls radar (KFSD), 121 km from the middle of the area, began a volume at 01:28 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 1.4 hours before the alert went out and 228 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
- 1088 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 1570 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
931 WUUS53 KFSD 060124 SVRFSD IAC041-059-141-143-060230- /O.NEW.KFSD.SV.W.0043.210706T0124Z-210706T0230Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Sioux Falls SD 824 PM CDT Mon Jul 5 2021 The National Weather Service in Sioux Falls has issued a * Severe Thunderstorm Warning for... Southeastern Osceola County in northwestern Iowa... Southern Dickinson County in northwestern Iowa... Clay County in northwestern Iowa... Northeastern O'Brien County in northwestern Iowa... * Until 930 PM CDT. * At 823 PM CDT, a severe thunderstorm was located near Melvin, or 13 miles southeast of Sibley, moving east at 30 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * This severe thunderstorm will be near... Hartley around 830 PM CDT. Everly around 845 PM CDT. Spencer In Clay County and Fostoria around 900 PM CDT. Other locations impacted by this severe thunderstorm include Dickens, Gillett Grove and Moneta. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4315 9562 4344 9553 4337 9491 4296 9492 TIME...MOT...LOC 0123Z 284DEG 28KT 4328 9552 HAIL...0.75IN WIND...60MPH $$ JM
2 follow-up statements
644 WWUS53 KFSD 060158 SVSFSD Severe Weather Statement National Weather Service Sioux Falls SD 858 PM CDT Mon Jul 5 2021 IAC041-059-141-143-060230- /O.CON.KFSD.SV.W.0043.000000T0000Z-210706T0230Z/ Osceola IA-Dickinson IA-Clay IA-O'Brien IA- 858 PM CDT Mon Jul 5 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR SOUTHEASTERN OSCEOLA...SOUTHERN DICKINSON...CLAY AND NORTHEASTERN O'BRIEN COUNTIES... At 858 PM CDT, a severe thunderstorm was located over Fostoria, or near Spencer In Clay County, moving east at 30 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe thunderstorm will remain over mainly rural areas of southeastern Osceola, southern Dickinson, Clay and northeastern O'Brien Counties, including the following locations... Dickens, Gillett Grove and Moneta. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4315 9562 4344 9553 4337 9491 4296 9492 TIME...MOT...LOC 0158Z 284DEG 28KT 4321 9515 HAIL...0.75IN WIND...60MPH $$ JM
330
WWUS53 KFSD 060223
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
923 PM CDT Mon Jul 5 2021
IAC041-059-141-143-060233-
/O.EXP.KFSD.SV.W.0043.000000T0000Z-210706T0230Z/
Osceola IA-Dickinson IA-Clay IA-O'Brien IA-
923 PM CDT Mon Jul 5 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OSCEOLA...
SOUTHERN DICKINSON...CLAY AND NORTHEASTERN O'BRIEN COUNTIES WILL
EXPIRE AT 930 PM 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.
LAT...LON 4315 9562 4344 9553 4337 9491 4296 9492
TIME...MOT...LOC 0223Z 284DEG 28KT 4316 9490
$$
JMThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 7:16 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola | 44 min |
| Jul 5, 7:57 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola | 33 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.