Alert archive / Iowa / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 21, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 11, 2023, 12:27 AM CDT for Plymouth County, Sioux County, Iowa. It was in force for 33 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
- May 11, 2023, 12:27 AM CDT (05:27 UTC)
- Expired
- May 11, 2023, 1:00 AM CDT
- In force
- 33 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
Counties Plymouth County, IA, Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 98 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 |
|---|---|---|---|
| May 11, 12:40 AM CDT | HAIL 1.75 | Oyens, IA | REPORT FROM SOCIAL MEDIA. |
| May 11, 12:42 AM CDT | HAIL 2 | Oyens, IA | SOCIAL MEDIA REPORT WITH PICTURE NEXT TO QUARTER. HAIL SIZE ESTIMATED 2 TO 2.5 INCHES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 5.5 hours before the alert went out and 167 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
- 1181 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1687 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 128 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
762
WUUS53 KFSD 110527
SVRFSD
IAC149-167-110600-
/O.NEW.KFSD.SV.W.0021.230511T0527Z-230511T0600Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1227 AM CDT Thu May 11 2023
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Southeastern Sioux County in northwestern Iowa...
Northeastern Plymouth County in northwestern Iowa...
* Until 100 AM CDT.
* At 1226 AM CDT, a severe thunderstorm was located over Merrill, or
near Le Mars, moving north at 35 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Public reported golf ball sized hail at 12:05 AM in
Hinton, Iowa.
IMPACT...People and animals outdoors will be injured. Expect
damage to roofs, siding, windows, and vehicles.
* This severe thunderstorm will be near...
Le Mars around 1235 AM CDT.
Struble around 1245 AM CDT.
Other locations in the path of this severe thunderstorm include
Maurice, Orange City and Alton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4266 9614 4268 9628 4305 9625 4303 9587
TIME...MOT...LOC 0526Z 195DEG 32KT 4274 9620
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
APT1 follow-up statement
296 WWUS53 KFSD 110546 SVSFSD Severe Weather Statement National Weather Service Sioux Falls SD 1246 AM CDT Thu May 11 2023 IAC149-167-110600- /O.CON.KFSD.SV.W.0021.000000T0000Z-230511T0600Z/ Sioux IA-Plymouth IA- 1246 AM CDT Thu May 11 2023 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT FOR SOUTHEASTERN SIOUX AND NORTHEASTERN PLYMOUTH COUNTIES... At 1246 AM CDT, a severe thunderstorm was located near Struble, or 7 miles southwest of Orange City, moving north at 35 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. Locations impacted include... Alton. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4275 9607 4277 9614 4304 9600 4303 9587 TIME...MOT...LOC 0546Z 195DEG 32KT 4291 9614 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ APT
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 11:48 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 42 min |
| May 11, 12:44 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 23 min |
| May 11, 1:40 AM CDT | Severe Thunderstorm Warning | FSD | Lyon | 50 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2023Every severe thunderstorm warning in 2023
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.