Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 49, NWS Sioux Falls, SD

July 8, 2021Clay County, Yankton County, South Dakota; Dixon County, Nebraska

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 8, 2021, 11:11 PM CDT for Clay County, Yankton County, South Dakota; Dixon County, Nebraska. It was in force for 34 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: Jul 8, 2021, 11:11 PM CDT (04:11 UTC)
Expired: Jul 8, 2021, 11:45 PM CDT
In force: 34 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Dixon County, NE, Clay County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 100 km from the middle of the area, began a volume at 04:10 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, 11:37 PM CDT	HAIL 1.25	5 Nne Dixon, NE	CORRECTS PREVIOUS HAIL REPORT FROM 5 NNE DIXON. [DELAYED REPORT] - MOSTLY QUARTER TO HALF-DOLLAR SIZED HAIL, VERY LITTLE RAINFALL.
Jul 8, 11:40 PM CDT	HAIL 0.88	5 Wsw Martinsburg, NE	[DELAYED REPORT] NICKEL AND DIMES FELL ALONG WITH HEAVY RAIN, NO WIND.

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, 4.2 hours before the alert went out and 166 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.

490 
WUUS53 KFSD 090411
SVRFSD
NEC051-SDC027-135-090445-
/O.NEW.KFSD.SV.W.0049.210709T0411Z-210709T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1111 PM CDT Thu Jul 8 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northwestern Dixon County in northeastern Nebraska...
  Southern Clay County in southeastern South Dakota...
  Southeastern Yankton County in southeastern South Dakota...

* Until 1145 PM CDT.

* At 1111 PM CDT, severe thunderstorms were located along a line
  extending from 6 miles west of Meckling to near Wynot to near
  Hartington, moving southeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Meckling around 1120 PM CDT.
  Maskell around 1130 PM CDT.
  Vermillion around 1135 PM CDT.
  Newcastle around 1140 PM CDT.
  Martinsburg around 1145 PM CDT.

Other locations impacted by these severe thunderstorms include
Gayville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4249 9702 4276 9701 4277 9704 4277 9713
      4280 9716 4281 9721 4284 9722 4286 9726
      4291 9723 4283 9681 4258 9681 4243 9684
TIME...MOT...LOC 0411Z 296DEG 31KT 4283 9719 4274 9721 4264 9723 

HAIL...<.75IN
WIND...60MPH
 
$$

APT

1 follow-up statement

388 
WWUS53 KFSD 090428
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1128 PM CDT Thu Jul 8 2021

NEC051-SDC027-135-090445-
/O.CON.KFSD.SV.W.0049.000000T0000Z-210709T0445Z/
Dixon NE-Clay SD-Yankton SD-
1128 PM CDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR NORTHWESTERN DIXON...SOUTHERN CLAY AND SOUTHEASTERN YANKTON
COUNTIES...

At 1128 PM CDT, severe thunderstorms were located along a line
extending from near Meckling to near Maskell to 8 miles northeast of
Coleridge, moving southeast at 35 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.

These severe storms will be near...
  Newcastle around 1140 PM CDT.
  Martinsburg around 1150 PM CDT.

Other locations impacted by these severe thunderstorms include
Gayville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4249 9702 4276 9701 4277 9704 4277 9713
      4280 9716 4281 9721 4284 9722 4286 9726
      4291 9723 4283 9681 4258 9681 4243 9684
TIME...MOT...LOC 0428Z 295DEG 31KT 4280 9702 4268 9704 4258 9706 

HAIL...1.00IN
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, 11:21 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, 2:15 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
Jul 8, 11:45 PM CDT	Severe Thunderstorm Warning	FSD	Dakota, Dixon	45 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021 Severe Thunderstorm Warnings in Nebraska, 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.