Alert archive / South Dakota / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Aberdeen, SD

June 8, 2021Corson County, South Dakota

NWS Aberdeen, SD issued this flash flood warning at Jun 8, 2021, 6:22 PM MDT for Corson County, South Dakota. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 8, 2021, 6:22 PM MDT (00:22 UTC)
Expired: Jun 8, 2021, 9:30 PM MDT
In force: 3 hr
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Flood severity: None

County Corson County, SD

The radar

The Bismarck radar (KBIS), 125 km from the middle of the area, began a volume at 00:20 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.4 hours before the alert went out and 127 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: 113 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 2317 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

988 
WGUS53 KABR 090022
FFWABR
SDC031-090330-
/O.NEW.KABR.FF.W.0001.210609T0022Z-210609T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Aberdeen SD
722 PM CDT Tue Jun 8 2021

The National Weather Service in Aberdeen has issued a

* Flash Flood Warning for...
  Northwestern Corson County in north central South Dakota...

* Until 930 PM MDT.

* At 622 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 4 inches of rain have 
  fallen. Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Standing Rock Nation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4585 10156 4584 10142 4565 10150 4576 10171

FLASH FLOOD...RADAR INDICATED

$$

Parkin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 6:17 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	43 min
Jun 8, 6:44 PM MDT	Flash Flood Warning	ABR	Corson, Dewey	3 hr
Jun 8, 6:44 PM MDT	Special Weather Statement	ABR	Corson	31 min
Jun 8, 7:02 PM MDT	Special Weather Statement	ABR	Corson	28 min
Jun 8, 7:11 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	49 min
Jun 8, 7:21 PM MDT	Tornado Warning Tornado observed	ABR	Corson, Dewey	24 min
Jun 8, 7:25 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	50 min
Jun 8, 7:44 PM MDT	Tornado Warning	ABR	Corson	16 min
Jun 8, 8:11 PM MDT	Special Weather Statement	ABR	Corson	34 min
Jun 8, 8:28 PM MDT	Severe Thunderstorm Warning	ABR	Dewey	47 min
Jun 8, 9:12 PM MDT	Severe Thunderstorm Warning	ABR	Dewey	36 min
Jun 8, 9:33 PM MDT	Flash Flood Warning Considerable damage threat	ABR	Corson, Dewey	8 hr
Jun 8, 10:54 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	66 min
Jun 8, 11:58 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Jones, Stanley	37 min
Jun 9, 12:03 AM MDT	Special Weather Statement	ABR	Corson, Dewey	57 min
Jun 9, 12:40 AM MDT	Special Weather Statement	ABR	Jones, Stanley	65 min

Nearby

Flash Flood Warnings in South Dakota, 2021 Every flash flood 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.