Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 73, NWS Sioux Falls, SD

August 5, 2021Lake County, Minnehaha County, Moody County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 5, 2021, 7:58 PM CDT for Lake County, Minnehaha County, Moody County, South Dakota. It was in force for 47 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: Aug 5, 2021, 7:58 PM CDT (00:58 UTC)
Expired: Aug 5, 2021, 8:45 PM CDT
In force: 47 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

Counties Lake County, SD, Minnehaha County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 39 km from the middle of the area, began a volume at 00:59 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
Aug 5, 8:00 PM CDT	HAIL 1.5	3 Ese Wentworth, SD	REPORT VIA SOCIAL MEDIA WITH PHOTOS.
Aug 5, 8:00 PM CDT	HAIL 1.75	2 E Wentworth, SD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.0 hours before the alert went out and 163 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: 835 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1549 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

452 
WUUS53 KFSD 060058
SVRFSD
SDC079-099-101-060145-
/O.NEW.KFSD.SV.W.0073.210806T0058Z-210806T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
758 PM CDT Thu Aug 5 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southwestern Moody County in east central South Dakota...
  Southeastern Lake County in east central South Dakota...
  North central Minnehaha County in southeastern South Dakota...

* Until 845 PM CDT.

* At 757 PM CDT, a severe thunderstorm was located over Wentworth, or
  9 miles east of Madison, moving southeast at 20 mph.

  HAZARD...Ping pong ball size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Colman and Chester around 810 PM CDT.

Other locations in the path of this severe thunderstorm include Dell
Rapids and Trent.

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 4397 9702 4402 9693 4392 9660 4372 9684
TIME...MOT...LOC 0057Z 306DEG 18KT 4397 9693 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

SSC

3 follow-up statements

806 
WWUS53 KFSD 060103
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
803 PM CDT Thu Aug 5 2021

SDC079-099-101-060145-
/O.CON.KFSD.SV.W.0073.000000T0000Z-210806T0145Z/
Moody SD-Lake SD-Minnehaha SD-
803 PM CDT Thu Aug 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR SOUTHWESTERN MOODY...SOUTHEASTERN LAKE AND NORTH CENTRAL
MINNEHAHA COUNTIES...

At 802 PM CDT, the public reported a severe thunderstorm producing
large damaging hail up to golf ball size. This storm was located near
Chester, or 11 miles east of Madison, moving southeast at 20 mph.

This severe storm will be near...
  Colman around 810 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you are in the path of this storm, prepare immediately for large
hail and damaging winds. People outside should move to a shelter,
preferably inside a strong building and away from windows.

In addition to large hail and damaging winds, 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 4395 9698 4401 9691 4392 9660 4372 9684
TIME...MOT...LOC 0102Z 306DEG 18KT 4395 9690 

$$

SSC

680 
WWUS53 KFSD 060120
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
820 PM CDT Thu Aug 5 2021

SDC079-099-101-060145-
/O.CON.KFSD.SV.W.0073.000000T0000Z-210806T0145Z/
Moody SD-Lake SD-Minnehaha SD-
820 PM CDT Thu Aug 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR SOUTHWESTERN MOODY...SOUTHEASTERN LAKE AND NORTH CENTRAL
MINNEHAHA COUNTIES...

At 819 PM CDT, the public reported a severe thunderstorm producing
large damaging hail up to golf ball size and destructive winds in
excess of 70 mph. This storm was located near Colman, or 17 miles
southeast of Madison, moving southeast at 20 mph.

This severe storm will be near...
  Dell Rapids and Trent around 835 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you are in the path of this storm, prepare immediately for large
hail and damaging winds. People outside should move to a shelter,
preferably inside a strong building and away from windows.

In addition to large hail and damaging winds, 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 4389 9694 4397 9679 4392 9660 4372 9684
TIME...MOT...LOC 0119Z 306DEG 18KT 4390 9680 

$$

SSC

311 
WWUS53 KFSD 060136
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
836 PM CDT Thu Aug 5 2021

SDC079-099-101-060145-
/O.EXP.KFSD.SV.W.0073.000000T0000Z-210806T0145Z/
Moody SD-Lake SD-Minnehaha SD-
836 PM CDT Thu Aug 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MOODY...
SOUTHEASTERN LAKE AND NORTH CENTRAL MINNEHAHA COUNTIES WILL EXPIRE AT
845 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail,
gusty winds and heavy rain are still possible with this thunderstorm.

Remember, a Severe Thunderstorm Warning still remains in effect for
Minnehaha County until 9:15 PM.

LAT...LON 4389 9694 4397 9679 4392 9660 4372 9684
TIME...MOT...LOC 0135Z 306DEG 18KT 4386 9672 

$$

SSC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 7:00 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Moody	45 min
Aug 5, 7:28 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Moody	32 min
Aug 5, 7:44 PM CDT	Severe Thunderstorm Warning	FSD	Moody	33 min
Aug 5, 8:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Minnehaha, Moody	51 min
Aug 5, 8:57 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lincoln, Minnehaha	48 min
Aug 5, 9:04 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	28 min
Aug 5, 10:04 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, McCook, Minnehaha, Turner	41 min
Aug 5, 10:36 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Turner, Union	39 min
Aug 5, 11:40 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	50 min
Aug 6, 12:10 AM CDT	Severe Thunderstorm Warning	FSD	Union	35 min
Aug 6, 1:06 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln	39 min
Aug 6, 1:36 AM CDT	Severe Thunderstorm Warning	FSD	Union	24 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.