Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 58, NWS Sioux Falls, SD

July 9, 2021Lincoln County, Union County, South Dakota; Plymouth County, Sioux County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 2021, 2:15 AM CDT for Lincoln County, Union County, South Dakota; Plymouth County, Sioux County, Iowa. It was in force for 45 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, 2:15 AM CDT (07:15 UTC)
Expired: Jul 9, 2021, 3:00 AM CDT
In force: 45 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Plymouth County, IA, Sioux County, IA, Lincoln County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 81 km from the middle of the area, began a volume at 07:16 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, 2:17 AM CDT	HAIL 1	4 Nne Hawarden, IA

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, 7.3 hours before the alert went out and 178 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted.

901 
WUUS53 KFSD 090715
SVRFSD
IAC149-167-SDC083-127-090800-
/O.NEW.KFSD.SV.W.0058.210709T0715Z-210709T0800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
215 AM CDT Fri Jul 9 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southern Sioux County in northwestern Iowa...
  North central Plymouth County in northwestern Iowa...
  Southeastern Lincoln County in southeastern South Dakota...
  Northeastern Union County in southeastern South Dakota...

* Until 300 AM CDT.

* At 215 AM CDT, a severe thunderstorm was located near Hudson, or
  near Hawarden, moving southeast at 35 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Ireton around 230 AM CDT.
  Maurice and Craig around 240 AM CDT.
  Struble around 245 AM CDT.

Other locations impacted by this severe thunderstorm include
Brunsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4271 9634 4306 9657 4314 9644 4298 9590
TIME...MOT...LOC 0715Z 308DEG 30KT 4307 9645 

HAIL...1.25IN
WIND...<50MPH
 
$$

SSC

1 follow-up statement

852 
WWUS53 KFSD 090735
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
235 AM CDT Fri Jul 9 2021

SDC083-127-090745-
/O.CAN.KFSD.SV.W.0058.000000T0000Z-210709T0800Z/
Lincoln SD-Union SD-
235 AM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LINCOLN AND
NORTHEASTERN UNION COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4276 9625 4302 9635 4309 9626 4298 9590
TIME...MOT...LOC 0735Z 308DEG 30KT 4297 9627 

$$

IAC149-167-090800-
/O.CON.KFSD.SV.W.0058.000000T0000Z-210709T0800Z/
Sioux IA-Plymouth IA-
235 AM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT
FOR SOUTHEASTERN SIOUX AND NORTH CENTRAL PLYMOUTH COUNTIES...

At 235 AM CDT, Doppler radar indicated a severe thunderstorm capable
of producing half dollar size hail. This storm was located over
Ireton, or 9 miles southwest of Sioux Center, moving southeast at 35
mph.

This severe storm will be near...
  Maurice around 240 AM CDT.
  Struble around 245 AM CDT.
  Le Mars around 255 AM CDT.

Other locations impacted by this severe thunderstorm include
Brunsville.

LAT...LON 4276 9625 4302 9635 4309 9626 4298 9590
TIME...MOT...LOC 0735Z 308DEG 30KT 4297 9627 

$$

SSC

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
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, 11:50 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	40 min
Jul 8, 11:59 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Turner, Union	46 min
Jul 9, 12:44 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	46 min
Jul 9, 12:46 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Union	44 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
Jul 8, 11:45 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	45 min
Jul 9, 12:29 AM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Plymouth	46 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021 Severe Thunderstorm Warnings in Iowa, 2021 Every 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.