Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 56, NWS Aberdeen, SD

July 9, 2021Dewey County, Sully County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 9, 2021, 3:17 AM MDT for Dewey County, Sully County, South Dakota. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 9, 2021, 3:17 AM MDT (09:17 UTC)
Expired: Jul 9, 2021, 3:44 AM MDT
In force: 27 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Dewey County, SD, Sully County, SD

The radar

The Aberdeen radar (KABR), 171 km from the middle of the area, began a volume at 09:17 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 9.3 hours before the alert went out and 160 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.

241 
WUUS53 KABR 090917
SVRABR
SDC041-119-091015-
/O.NEW.KABR.SV.W.0056.210709T0917Z-210709T1015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
417 AM CDT Fri Jul 9 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Western Sully County in central South Dakota...
  Southeastern Dewey County in north central South Dakota...

* Until 515 AM CDT/415 AM MDT/.

* At 416 AM CDT/316 AM MDT/, a severe thunderstorm was located 8
  miles southwest of Lake Oahe, or 31 miles northwest of Onida,
  moving southeast at 25 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.

* Locations impacted include...
  Sutton Bay Rec Area and Bush'S Landing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Oahe, get away from the water and move indoors or 
inside a vehicle. Remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 4502 10059 4494 10042 4491 10041 4490 10040
      4490 10033 4479 10010 4459 10043 4497 10066
TIME...MOT...LOC 0916Z 320DEG 23KT 4495 10060 

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

Dorn

2 follow-up statements

711 
WWUS53 KABR 090931
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
431 AM CDT Fri Jul 9 2021

SDC041-119-091015-
/O.CON.KABR.SV.W.0056.000000T0000Z-210709T1015Z/
Sully SD-Dewey SD-
431 AM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 AM
CDT/415 AM MDT/ FOR WESTERN SULLY AND SOUTHEASTERN DEWEY COUNTIES...

At 430 AM CDT/330 AM MDT/, a severe thunderstorm was located 7 miles
west of Sutton Bay Rec Area, or 24 miles northwest of Onida, moving
southeast at 25 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Sutton Bay Rec Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Oahe, get away from the water and move indoors or 
inside a vehicle. remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 4492 10046 4491 10041 4490 10040 4490 10033
      4479 10010 4459 10043 4488 10054
TIME...MOT...LOC 0930Z 320DEG 23KT 4488 10051 

HAIL...0.75IN
WIND...60MPH
 
$$

Dorn

935 
WWUS53 KABR 090944
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
444 AM CDT Fri Jul 9 2021

SDC041-119-090953-
/O.CAN.KABR.SV.W.0056.000000T0000Z-210709T1015Z/
Sully SD-Dewey SD-
444 AM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SULLY AND SOUTHEASTERN
DEWEY COUNTIES IS CANCELLED...
                
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 has been cancelled.

LAT...LON 4492 10046 4491 10041 4490 10040 4490 10033
      4479 10010 4459 10043 4488 10054
TIME...MOT...LOC 0943Z 320DEG 23KT 4481 10043 

$$

Dorn

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:35 PM MDT	Severe Thunderstorm Warning	ABR	Dewey	26 min
Jul 8, 9:45 PM MDT	Severe Thunderstorm Warning	ABR	Corson	45 min
Jul 8, 10:22 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	53 min
Jul 9, 1:46 AM MDT	Special Weather Statement	ABR	Dewey	44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.