Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS Sioux Falls, SD

July 8, 20215 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 8, 2021, 11:21 PM CDT for 5 counties in South Dakota. It was in force for 39 min. 4 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 8, 2021, 11:21 PM CDT (04:21 UTC)
Expired: Jul 9, 2021, 12:00 AM CDT
In force: 39 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Clay County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 56 km from the middle of the area, began a volume at 04:21 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 8, 11:25 PM CDT	HAIL 0.88	Freeman, SD	HEAVY RAIN AND NICKEL SIZED HAIL.
Jul 8, 11:25 PM CDT	HAIL 1.5	Freeman, SD	SOCIAL MEDIA REPORT OF PING PONG SIZED HAIL.
Jul 8, 11:29 PM CDT	HAIL 1.25	2 Sse Freeman, SD	HEAVY RAIN AND HAIL UP TO SIZE OF HALF DOLLARS.
Jul 8, 11:29 PM CDT	HAIL 1.25	3 Ese Freeman, SD	LOTS OF HALF DOLLAR SIZED HAIL STRIPPED THE CORN ALONG 280TH STREET VERY BADLY.

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

Aberdeen, SD (KABR), launched 00:00Z, 4.4 hours before the alert went out and 213 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: 82 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 996 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

215 
WUUS53 KFSD 090421
SVRFSD
SDC027-067-083-125-135-090500-
/O.NEW.KFSD.SV.W.0050.210709T0421Z-210709T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1121 PM CDT Thu Jul 8 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northern Clay County in southeastern South Dakota...
  Southwestern Lincoln County in southeastern South Dakota...
  Yankton County in southeastern South Dakota...
  Turner County in southeastern South Dakota...
  Southeastern Hutchinson County in southeastern South Dakota...

* Until midnight CDT.

* At 1121 PM CDT, severe thunderstorms were located along a line
  extending from near Freeman to 6 miles east of Menno to 6 miles
  west of Mayfield, moving east at 40 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Mayfield around 1130 PM CDT.
  Irene around 1140 PM CDT.
  Volin around 1145 PM CDT.
  Viborg and Wakonda around 1150 PM CDT.
  Hurley around 1155 PM CDT.
  Centerville, Chancellor and Davis around 1200 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4341 9694 4283 9685 4297 9754 4338 9758
TIME...MOT...LOC 0421Z 279DEG 34KT 4333 9749 4321 9746 4310 9744 

HAIL...1.25IN
WIND...60MPH
 
$$

APT

1 follow-up statement

373 
WWUS53 KFSD 090448
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1148 PM CDT Thu Jul 8 2021

SDC067-090457-
/O.CAN.KFSD.SV.W.0050.000000T0000Z-210709T0500Z/
Hutchinson SD-
1148 PM CDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUTCHINSON COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 4341 9694 4283 9685 4289 9711 4298 9727
      4339 9738
TIME...MOT...LOC 0447Z 278DEG 36KT 4334 9719 4317 9711 4288 9697 

$$

SDC027-083-125-135-090500-
/O.CON.KFSD.SV.W.0050.000000T0000Z-210709T0500Z/
Clay SD-Lincoln SD-Yankton SD-Turner SD-
1148 PM CDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR NORTHERN CLAY...SOUTHWESTERN LINCOLN...NORTHEASTERN YANKTON AND
TURNER COUNTIES...

At 1147 PM CDT, severe thunderstorms were located along a line
extending from near Parker to Viborg to near Meckling, moving east at
40 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.

Locations impacted include...
  Centerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4341 9694 4283 9685 4289 9711 4298 9727
      4339 9738
TIME...MOT...LOC 0447Z 278DEG 36KT 4334 9719 4317 9711 4288 9697 

HAIL...1.50IN
WIND...60MPH
 
$$

APT

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, 11:50 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, 2:15 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Union	45 min
Jul 9, 2:34 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, Lake, McCook, Miner	41 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.