Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Sioux Falls, SD

April 6, 2021Charles Mix County, Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 6, 2021, 9:39 AM CDT for Charles Mix County, Gregory County, South Dakota. It was in force for 10 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: Apr 6, 2021, 9:39 AM CDT (14:39 UTC)
Expired: Apr 6, 2021, 9:49 AM CDT
In force: 10 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Charles Mix County, SD, Gregory County, SD

The radar

The Sioux Falls radar (KFSD), 177 km from the middle of the area, began a volume at 14:42 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

Aberdeen, SD (KABR), launched 12:00Z, 2.7 hours before the alert went out and 194 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2037 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

542 
WUUS53 KFSD 061439
SVRFSD
SDC023-053-061500-
/O.NEW.KFSD.SV.W.0009.210406T1439Z-210406T1500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
939 AM CDT Tue Apr 6 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Central Charles Mix County in south central South Dakota...
  South central Gregory County in south central South Dakota...

* Until 1000 AM CDT.

* At 939 AM CDT, a severe thunderstorm was located 8 miles northeast
  of Bonesteel, or 16 miles west of Lake Andes, moving north at 35
  mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will remain over mainly rural areas of
  central Charles Mix and south central Gregory Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4309 9878 4309 9895 4332 9901 4332 9870
TIME...MOT...LOC 1439Z 181DEG 30KT 4318 9886 

HAIL...1.00IN
WIND...<50MPH
 
$$

SSC

1 follow-up statement

850 
WWUS53 KFSD 061449
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
949 AM CDT Tue Apr 6 2021

SDC023-053-061459-
/O.CAN.KFSD.SV.W.0009.000000T0000Z-210406T1500Z/
Charles Mix SD-Gregory SD-
949 AM CDT Tue Apr 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CHARLES MIX AND SOUTH
CENTRAL GREGORY COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However heavy rain is still possible with this
thunderstorm.

LAT...LON 4309 9878 4309 9895 4332 9901 4332 9870
TIME...MOT...LOC 1446Z 181DEG 30KT 4326 9886 

$$

SSC

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 7:03 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	27 min
Apr 5, 7:39 PM CDT	Severe Thunderstorm Warning	FSD	Moody	36 min
Apr 5, 7:49 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	26 min
Apr 5, 8:44 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	31 min
Apr 5, 9:04 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha, Turner	26 min
Apr 5, 9:27 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	33 min
Apr 5, 9:48 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	27 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.