Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 52, NWS Aberdeen, SD

July 5, 2021Lyman County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 5, 2021, 2:30 PM CDT for Lyman County, South Dakota. It was in force for 30 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 5, 2021, 2:30 PM CDT (19:30 UTC)
Expired: Jul 5, 2021, 3:00 PM CDT
In force: 30 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Possible
Hail: 1.25 in
Wind: 60.0 mph

County Lyman County, SD

The radar

The Aberdeen radar (KABR), 209 km from the middle of the area, began a volume at 19:33 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 12:00Z, 7.5 hours before the alert went out and 155 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1844 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

894 
WUUS53 KABR 051930
SVRABR
SDC085-052015-
/O.NEW.KABR.SV.W.0052.210705T1930Z-210705T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
230 PM CDT Mon Jul 5 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Southeastern Lyman County in central South Dakota...

* Until 315 PM CDT.

* At 229 PM CDT, a severe thunderstorm was located near Dude Ranch,
  or 10 miles southwest of Chamberlain, moving northeast at 5 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...
  Lake Francis Case, Oacoma and Dude Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Aberdeen.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4369 9962 4373 9962 4392 9951 4383 9933
      4379 9938 4378 9941 4374 9942 4373 9941
      4371 9941 4368 9947 4365 9945 4366 9938
      4362 9944
TIME...MOT...LOC 1929Z 214DEG 6KT 4371 9950 

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

Dorn

2 follow-up statements

497 
WWUS53 KABR 051944
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
244 PM CDT Mon Jul 5 2021

SDC085-052015-
/O.CON.KABR.SV.W.0052.000000T0000Z-210705T2015Z/
Lyman SD-
244 PM CDT Mon Jul 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR SOUTHEASTERN LYMAN COUNTY...

At 244 PM CDT, a severe thunderstorm was located near Dude Ranch, or
9 miles west of Chamberlain, moving north at 10 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...
Oacoma, Dude Ranch and Lake Francis Case. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Aberdeen.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4369 9962 4373 9962 4392 9951 4383 9933
      4379 9938 4378 9941 4374 9942 4373 9941
      4371 9941 4368 9947 4365 9945 4366 9938
      4362 9944
TIME...MOT...LOC 1944Z 183DEG 10KT 4374 9951 

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

Dorn

280 
WWUS53 KABR 052000
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
300 PM CDT Mon Jul 5 2021

SDC085-052010-
/O.CAN.KABR.SV.W.0052.000000T0000Z-210705T2015Z/
Lyman SD-
300 PM CDT Mon Jul 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LYMAN COUNTY IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe 
limits. Therefore, the warning has been cancelled.  However heavy 
rain is still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Aberdeen.

LAT...LON 4369 9962 4373 9962 4392 9951 4383 9933
      4379 9938 4378 9941 4374 9942 4373 9941
      4371 9941 4368 9947 4365 9945 4366 9938
      4362 9944
TIME...MOT...LOC 1956Z 214DEG 6KT 4379 9950 

$$

Dorn

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 11:15 AM CDT	Special Weather Statement	ABR	Stanley	30 min
Jul 5, 11:48 AM CDT	Special Weather Statement	ABR	Stanley	27 min
Jul 5, 12:14 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley, Sully	46 min
Jul 5, 12:48 PM CDT	Special Weather Statement	ABR	Hughes	42 min
Jul 5, 1:30 PM CDT	Special Weather Statement	ABR	Lyman	45 min
Jul 5, 1:50 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	40 min
Jul 5, 3:13 PM CDT	Areal Flood Warning	ABR	Lyman	6 hr
Jul 5, 3:18 PM CDT	Areal Flood Warning	ABR	Jones	6 hr

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.