Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 158, NWS Sioux Falls, SD

September 16, 2021Charles Mix County, Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 16, 2021, 10:20 PM CDT for Charles Mix County, Gregory County, South Dakota. It was in force for 25 min. 3 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: Sep 16, 2021, 10:20 PM CDT (03:20 UTC)
Expired: Sep 16, 2021, 10:45 PM CDT
In force: 25 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Charles Mix County, SD, Gregory County, SD

The radar

The North Platte radar (KLNX), 181 km from the middle of the area, began a volume at 03:20 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
Sep 16, 10:27 PM CDT	HAIL 0.75	Burke, SD	ACCOMPANIED BY STRONG WINDS, BUT NO DAMAGE.
Sep 16, 10:27 PM CDT	HAIL 1.25	4 W Herrick, SD
Sep 16, 10:48 PM CDT	HAIL 0.7	Bonesteel, SD	RELAYED REPORT FROM A DEPUTY REPORTING DIMES IN BONESTEEL, SD.

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
Sep 16, 8:16 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.3 hours before the alert went out and 193 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: 1789 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: -170 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

800 
WUUS53 KFSD 170320
SVRFSD
SDC023-053-170345-
/O.NEW.KFSD.SV.W.0158.210917T0320Z-210917T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1020 PM CDT Thu Sep 16 2021

The National Weather Service in Sioux Falls has issued a

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

* Until 1045 PM CDT.

* At 1020 PM CDT, a severe thunderstorm was located near Gregory, or
  27 miles southeast of Winner, moving east at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Burke around 1030 PM CDT.
  Herrick around 1035 PM CDT.

Other locations impacted by this severe thunderstorm include Dixon In
Gregory County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4336 9953 4350 9919 4350 9908 4300 9892
      4300 9953
TIME...MOT...LOC 0320Z 248DEG 37KT 4315 9941 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

2 follow-up statements

057 
WWUS53 KFSD 170327
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1027 PM CDT Thu Sep 16 2021

SDC023-053-170345-
/O.CON.KFSD.SV.W.0158.000000T0000Z-210917T0345Z/
Charles Mix SD-Gregory SD-
1027 PM CDT Thu Sep 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR NORTHWESTERN CHARLES MIX AND GREGORY COUNTIES...

At 1027 PM CDT, a severe thunderstorm was located over Burke, or 31
miles southeast of Winner, moving east at 45 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4335 9949 4346 9918 4350 9908 4300 9892
      4300 9946
TIME...MOT...LOC 0327Z 249DEG 38KT 4317 9929 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

566 
WWUS53 KFSD 170344
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1044 PM CDT Thu Sep 16 2021

SDC023-053-170354-
/O.EXP.KFSD.SV.W.0158.000000T0000Z-210917T0345Z/
Charles Mix SD-Gregory SD-
1044 PM CDT Thu Sep 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CHARLES MIX AND
GREGORY COUNTIES WILL EXPIRE AT 1045 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.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
south central South Dakota.

LAT...LON 4335 9949 4346 9918 4350 9908 4300 9892
      4300 9946
TIME...MOT...LOC 0344Z 256DEG 36KT 4315 9908 

$$

SG

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 11:31 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Hutchinson, Yankton	29 min
Sep 17, 12:10 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Brookings, Lake, McCook, Minnehaha, Moody	35 min
Sep 17, 12:29 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Turner, Union, Yankton	46 min
Sep 17, 12:34 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Minnehaha	56 min
Sep 17, 12:36 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lincoln, Minnehaha	54 min
Sep 17, 1:11 AM CDT	Severe Thunderstorm Warning	FSD	Union	49 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.