Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 197, NWS Aberdeen, SD

August 23, 2018Dewey County, Potter County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 23, 2018, 7:37 PM MDT for Dewey County, Potter County, South Dakota. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 23, 2018, 7:37 PM MDT (01:37 UTC)
Expired: Aug 23, 2018, 8:00 PM MDT
In force: 23 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Dewey County, SD, Potter County, SD

The radar

The Aberdeen radar (KABR), 161 km from the middle of the area, began a volume at 01:37 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 23, 5:01 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.6 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: 1172 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 816 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 23, 5:32 PM MDT, 2 hours 5 minutes earlier.

Area forecast discussion, Aug 23, 5:32 PM MDT, 2 hours 5 minutes before

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Hazardous weather outlook, Aug 23, 3:33 AM MDT, 16 hours 4 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
433 AM CDT Thu Aug 23 2018

SDZ003>005-009-010-015>017-033>037-045-048-051-240945-
Corson-Campbell-McPherson-Walworth-Edmunds-Dewey-Potter-Faulk-
Stanley-Sully-Hughes-Hyde-Hand-Jones-Lyman-Buffalo-
433 AM CDT Thu Aug 23 2018 /333 AM MDT Thu Aug 23 2018/

This Hazardous Weather Outlook is for central South Dakota and
north central South Dakota.

.DAY ONE...Today and tonight.

Thunderstorms are possible this afternoon through tonight. A few
storms could become strong to severe late this afternoon through this
evening, mainly between the Missouri River to the James River.
Strong winds and large hail will be the main threats, along with
brief heavy rain.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested. Weather spotters are encouraged
to submit reports to the National Weather Service in Aberdeen. The
public can submit reports on our web page, Facebook page, or our
Twitter feed.

MNZ039-046-SDZ006>008-011-018>023-240945-
Traverse-Big Stone-Brown-Marshall-Roberts-Day-Spink-Clark-Codington-
Grant-Hamlin-Deuel-
433 AM CDT Thu Aug 23 2018

This Hazardous Weather Outlook is for west central Minnesota and
northeast South Dakota.

.DAY ONE...Today and tonight.

Thunderstorms are possible this afternoon through tonight. A few
storms could become strong to severe late this afternoon through this
evening, mainly between the Missouri River to the James River.
Strong winds and large hail will be the main threats, along with
brief heavy rain.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Thunderstorms will be possible Friday. However, severe weather is
not expected.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested. Weather spotters are encouraged
to submit reports to the National Weather Service in Aberdeen. The
public can submit reports on our web page, Facebook page, or our
Twitter feed.

KF

In the hours before

Local storm report, Aug 23, 5:19 PM MDT, 2 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
619 PM CDT THU AUG 23 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0601 PM     HAIL             2 N HOVEN               45.27N 99.78W
08/23/2018  E1.75 INCH       WALWORTH           SD   PUBLIC

            MOST HAILSTONES WERE AROUND NICKLE SIZED,
            BUT A COUPLE TO GOLF BALL DIAMETER WERE ALSO
            OBSERVED. RADAR ESTIMATED TIME.

&&

RL

Local storm report, Aug 23, 5:32 PM MDT, 2 hours 5 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 6:08 PM MDT	Severe Thunderstorm Warning	ABR	Hand, Hyde	52 min
Aug 23, 6:13 PM MDT	Severe Thunderstorm Warning	ABR	Corson	47 min
Aug 23, 6:25 PM MDT	Severe Thunderstorm Warning	ABR	Lyman	42 min
Aug 23, 7:14 PM MDT	Special Weather Statement	ABR	Hughes, Hyde	31 min
Aug 23, 7:41 PM MDT	Special Weather Statement	ABR	Corson	34 min
Aug 23, 8:01 PM MDT	Severe Thunderstorm Warning	ABR	Brown	17 min
Aug 23, 8:06 PM MDT	Special Weather Statement	ABR	Hand	24 min
Aug 23, 8:24 PM MDT	Special Weather Statement	ABR	Campbell, Walworth	51 min
Aug 23, 8:39 PM MDT	Special Weather Statement	ABR	Day	36 min
Aug 23, 9:31 PM MDT	Special Weather Statement	ABR	Day	29 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2018 Every severe thunderstorm warning in 2018

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.