Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 53, NWS Sioux Falls, SD

July 8, 20214 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 8, 2021, 11:59 PM CDT for 4 counties in South Dakota. It was in force for 46 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, 11:59 PM CDT (04:59 UTC)
Expired
Jul 9, 2021, 12:45 AM CDT
In force
46 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Clay County, SD, Lincoln County, SD, Turner County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 51 km from the middle of the area, began a volume at 04:59 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

TimeReportWhereRemark
Jul 9, 12:25 AM CDTHAIL 16 Sse Centerville, SD
Jul 9, 12:47 AM CDTHAIL 15 Sw Alcester, SD[DELAYED REPORT] - ESTIMATES HAIL WAS QUARTER SIZE, BUT NO DAMAGE TO REPORT.

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.

IssuedProductOfficeLasted
Jul 8, 9:33 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.0 hours before the alert went out and 203 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2021-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 155 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2021-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 200 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

733 
WUUS53 KFSD 090459
SVRFSD
SDC027-083-125-127-090545-
/O.NEW.KFSD.SV.W.0053.210709T0459Z-210709T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1159 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...
  Lincoln County in southeastern South Dakota...
  Eastern Turner County in southeastern South Dakota...
  Northern Union County in southeastern South Dakota...

* Until 1245 AM CDT.

* At 1159 PM CDT, severe thunderstorms were located along a line
  extending from near Chancellor to near Centerville to 6 miles east
  of Wakonda, moving east 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.

* Severe thunderstorms will be near...
  Beresford and Worthing around 1220 AM CDT.
  Alcester around 1235 AM CDT.
  Canton and Newton Hills State Park around 1240 AM CDT.
  Hawarden and Hudson around 1245 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4300 9709 4343 9713 4334 9653 4331 9653
      4330 9658 4327 9658 4326 9655 4324 9657
      4322 9652 4322 9647 4311 9644 4306 9646
      4304 9651 4300 9649 4298 9652 4296 9650
      4292 9654 4289 9653
TIME...MOT...LOC 0459Z 282DEG 31KT 4334 9701 4316 9699 4300 9697 

HAIL...1.00IN
WIND...60MPH
 
$$

APT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 10:53 PM CDTSevere Thunderstorm WarningFSDBon Homme, Hutchinson, Turner, Yankton52 min
Jul 8, 10:56 PM CDTSevere Thunderstorm WarningFSDYankton19 min
Jul 8, 11:11 PM CDTSevere Thunderstorm WarningFSDClay, Yankton34 min
Jul 8, 11:21 PM CDTSevere Thunderstorm WarningFSDClay, Hutchinson, Lincoln, Turner, Yankton39 min
Jul 8, 11:50 PM CDTSevere Thunderstorm WarningFSDClay, Union40 min
Jul 9, 12:44 AM CDTSevere Thunderstorm WarningFSDClay, Union46 min
Jul 9, 12:46 AM CDTSevere Thunderstorm WarningFSDLincoln, Union44 min
Jul 9, 1:22 AM CDTSevere Thunderstorm WarningFSDAurora, Davison, Jerauld, Sanborn38 min
Jul 9, 2:15 AM CDTSevere Thunderstorm WarningFSDLincoln, Union45 min
Jul 9, 2:34 AM CDTSevere Thunderstorm WarningFSDHanson, Lake, McCook, Miner41 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021Every 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.