Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 54, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 2021, 12:29 AM CDT for Cherokee County, Plymouth County, Iowa. It was in force for 46 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
- Jul 9, 2021, 12:29 AM CDT (05:29 UTC)
- Expired
- Jul 9, 2021, 1:15 AM CDT
- In force
- 46 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Cherokee County, IA, Plymouth County, IA
The radar
The Sioux Falls radar (KFSD), 117 km from the middle of the area, began a volume at 05:28 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 |
|---|---|---|---|
| Jul 9, 12:29 AM CDT | HAIL 1 | 5 S Le Mars, IA | QUARTER SIZED HAIL AND HEAVY RAIN. |
| Jul 9, 12:31 AM CDT | HAIL 1 | 5 E Merrill, IA | QUARTER SIZED HAIL, HEAVY RAIN, AND NOT MUCH WIND. |
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, 5.5 hours before the alert went out and 158 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.
632 WUUS53 KFSD 090529 SVRFSD IAC035-149-090615- /O.NEW.KFSD.SV.W.0054.210709T0529Z-210709T0615Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Sioux Falls SD 1229 AM CDT Fri Jul 9 2021 The National Weather Service in Sioux Falls has issued a * Severe Thunderstorm Warning for... Cherokee County in northwestern Iowa... Eastern Plymouth County in northwestern Iowa... * Until 115 AM CDT. * At 1229 AM CDT, a severe thunderstorm was located near Le Mars, moving east at 50 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * This severe thunderstorm will be near... Remsen around 1240 AM CDT. Cleghorn around 1255 AM CDT. Quimby around 100 AM CDT. Cherokee around 105 AM CDT. Aurelia around 115 AM CDT. Other locations impacted by this severe thunderstorm include Brunsville, Oyens and Meriden. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4263 9630 4281 9631 4289 9539 4256 9539 TIME...MOT...LOC 0529Z 272DEG 42KT 4272 9612 HAIL...1.00IN WIND...<50MPH $$ APT
2 follow-up statements
064 WWUS53 KFSD 090547 SVSFSD Severe Weather Statement National Weather Service Sioux Falls SD 1247 AM CDT Fri Jul 9 2021 IAC035-149-090615- /O.CON.KFSD.SV.W.0054.000000T0000Z-210709T0615Z/ Cherokee IA-Plymouth IA- 1247 AM CDT Fri Jul 9 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM CDT FOR CHEROKEE AND SOUTHEASTERN PLYMOUTH COUNTIES... At 1246 AM CDT, a severe thunderstorm was located 8 miles south of Marcus, or 15 miles west of Cherokee, moving east at 45 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. This severe storm will be near... Cleghorn around 1255 AM CDT. Quimby around 100 AM CDT. Cherokee around 110 AM CDT. Aurelia around 115 AM CDT. Other locations impacted by this severe thunderstorm include Meriden. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4261 9602 4278 9602 4289 9539 4256 9539 TIME...MOT...LOC 0546Z 271DEG 40KT 4271 9586 HAIL...1.00IN WIND...<50MPH $$ APT
440
WWUS53 KFSD 090610
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
110 AM CDT Fri Jul 9 2021
IAC035-149-090620-
/O.EXP.KFSD.SV.W.0054.000000T0000Z-210709T0615Z/
Cherokee IA-Plymouth IA-
110 AM CDT Fri Jul 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR CHEROKEE AND SOUTHEASTERN
PLYMOUTH COUNTIES WILL EXPIRE AT 115 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 and west central Iowa.
LAT...LON 4261 9602 4278 9602 4289 9539 4256 9539
TIME...MOT...LOC 0610Z 272DEG 42KT 4270 9549
$$
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, 12:44 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 46 min |
| Jul 9, 12:46 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 44 min |
| Jul 9, 2:15 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 45 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.