Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 185, NWS Aberdeen, SD

August 6, 2018Jones County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 6, 2018, 5:59 PM CDT for Jones County, South Dakota. It was in force for 31 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 6, 2018, 5:59 PM CDT (22:59 UTC)
Expired: Aug 6, 2018, 6:30 PM CDT
In force: 31 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Jones County, SD

The radar

The Rapid City radar (KUDX), 172 km from the middle of the area, began a volume at 23:00 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

Rapid City, SD (KRAP), launched 12:00Z, 11.0 hours before the alert went out and 176 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: 1536 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 6, 2:04 PM CDT, 3 hours 55 minutes earlier.

Area forecast discussion, Aug 6, 2:04 PM CDT, 3 hours 55 minutes before

Area Forecast Discussion
National Weather Service Aberdeen SD
204 PM CDT Mon Aug 6 2018

.SHORT TERM...(This Evening through Tuesday)
Issued at 204 PM CDT Mon Aug 6 2018

Pcpn chances remain the biggest challenge through tonight. The
latest models, both CAM and non-CAM suggest a couple areas of
heightened shower/storm activity into the evening and overnight
hours. The first area is over the northeast CWA.  This is where the
models and latest SPC meso data suggest a moisture/instability axis
will continue to set up through early evening. 88D currently shows
activity over this region, and suspect isold/sct activity will
continue into the evening hours. Shear is pretty weak, but
instability per MLCAPEs approaching or exceeding 1k J/kg suggests at
least weak to moderate instability to work with.

The next area of concern is southwest and south central South
Dakota. It appears that convection forming over the Black Hills will
spread out into the plains, and then move across the southern third
of the state this evening and tonight, perhaps forming into a
relatively small MCS in the process. This activity could feed off of
better deep layer shear per strong H5 winds across Nebraska and far
southern South Dakota. The best chance for isolated svr weather this
evening would be along and south of I90.

.LONG TERM...(Tuesday Night through Monday)
Issued at 204 PM CDT Mon Aug 6 2018

Mostly dry with above normal temperatures will be the rule this
period. The overall 500mb pattern shows low pressure over north
central Canada, with a trough extending across the northeastern
third of the nation. An additional low would be set up off the
Pacific Coast. In between, high pressure dominates the southern half
of the nation, with a ridge extending into British Columbia.

The steady 500 mb high over the southwestern states will push its
ridge into the Northern and Central Plains Friday night into Sunday,
before the entire ridge becomes supressed as the Pacific low moves
across the Pacific Northwest.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday Afternoon)
Issued at 1243 PM CDT Mon Aug 6 2018

VFR conditions expected overnight with some mid and high clouds.
Some scattered showers/storms expected to develop this afternoon
bringing some low clouds and may affect KPIR/KATY. Possibility
these storms could reach KABR however not enough confidence to
include in TAF.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
&&

SHORT TERM...TDK
LONG TERM...KF
AVIATION...ALD

Hazardous weather outlook, Aug 6, 9:34 AM CDT, 8 hours 25 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Aberdeen SD
934 AM CDT Mon Aug 6 2018

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-071445-
Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall-Roberts-
Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark-Codington-Grant-
Hamlin-Deuel-Stanley-Sully-Hughes-Hyde-Hand-Jones-Lyman-Buffalo-
934 AM CDT Mon Aug 6 2018 /834 AM MDT Mon Aug 6 2018/

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

.DAY ONE...Today and tonight.

Scattered showers and thunderstorms are expected across the region
this afternoon and tonight. The threat of severe weather is low.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

tdk

In the hours before

Special weather statement, Aug 6, 3:36 PM CDT, 2 hours 23 minutes before

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Special weather statement, Aug 6, 3:52 PM CDT, 2 hours 7 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
352 PM CDT MON AUG 6 2018

MNZ046-062130-
Big Stone MN-
352 PM CDT MON AUG 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BIG STONE COUNTY
UNTIL 430 PM CDT...

At 352 PM CDT, Doppler radar was tracking a strong thunderstorm over
Yankeetown, or 17 miles southeast of Sisseton, moving east at 20 mph.

Dime size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Yankeetown, Big Stone Lake and Bonanza Grove.

LAT...LON 4541 9662 4541 9664 4545 9672 4550 9675
      4554 9679 4557 9658 4539 9657
TIME...MOT...LOC 2052Z 268DEG 16KT 4550 9676

KF

Special weather statement, Aug 6, 5:11 PM CDT, 48 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
511 PM CDT MON AUG 6 2018

SDZ045-062245-
Jones SD-
511 PM CDT MON AUG 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN JONES COUNTY UNTIL
545 PM CDT...

At 511 PM CDT, Doppler radar was tracking a strong thunderstorm near
Capa, or 15 miles northwest of Murdo, moving east at 20 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

This storm will remain over mainly rural areas of northwestern Jones
County.

LAT...LON 4407 10104 4413 10089 4412 10065 4388 10088
      4404 10104
TIME...MOT...LOC 2211Z 291DEG 18KT 4404 10096

KF

Special weather statement, Aug 6, 5:18 PM CDT, 41 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
418 PM MDT MON AUG 6 2018

SDZ003-062245-
Corson SD-
418 PM MDT MON AUG 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CORSON COUNTY UNTIL 445
PM MDT...

At 418 PM MDT, Doppler radar was tracking a strong thunderstorm near
Bullhead, or 16 miles west of Mclaughlin, moving east at 10 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Bullhead.

LAT...LON 4578 10121 4584 10117 4581 10094 4569 10102
TIME...MOT...LOC 2218Z 286DEG 8KT 4580 10115

KF

Special weather statement, Aug 6, 5:24 PM CDT, 35 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
524 PM CDT MON AUG 6 2018

SDZ045-062300-
Jones SD-
524 PM CDT MON AUG 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL JONES COUNTY UNTIL
600 PM CDT...

At 524 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Okaton, or 16 miles west of Murdo, moving southeast at
20 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Okaton.

LAT...LON 4382 10097 4384 10096 4383 10098 4385 10099
      4384 10103 4386 10103 4385 10106 4399 10106
      4399 10105 4391 10085 4382 10092 4383 10094
      4381 10095
TIME...MOT...LOC 2224Z 307DEG 16KT 4390 10104

KF

Special weather statement, Aug 6, 5:44 PM CDT, 15 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
544 PM CDT MON AUG 6 2018

SDZ045-062315-
Jones SD-
544 PM CDT MON AUG 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL JONES COUNTY UNTIL 615 PM
CDT...

At 544 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles north of Draper to near Okaton.
Movement was east at 25 mph.

Dime size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Murdo, Draper, Okaton and Westover.

LAT...LON 4374 10075 4372 10079 4376 10081 4376 10084
      4379 10086 4378 10088 4380 10088 4379 10090
      4383 10093 4381 10095 4385 10099 4384 10103
      4386 10103 4385 10106 4388 10106 4410 10055
      4400 10036 4390 10037 4371 10074
TIME...MOT...LOC 2244Z 284DEG 22KT 4404 10051 4384 10096

KF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 2:15 PM CDT	Special Weather Statement	ABR	Roberts	60 min
Aug 6, 5:11 PM CDT	Special Weather Statement	ABR	Jones	34 min
Aug 6, 5:18 PM CDT	Special Weather Statement	ABR	Corson	27 min
Aug 6, 5:24 PM CDT	Special Weather Statement	ABR	Jones	36 min
Aug 6, 5:44 PM CDT	Special Weather Statement	ABR	Jones	31 min
Aug 6, 6:08 PM CDT	Special Weather Statement	ABR	Jones	37 min
Aug 6, 6:21 PM CDT	Special Weather Statement	ABR	Lyman	39 min
Aug 6, 6:35 PM CDT	Special Weather Statement	ABR	Lyman	25 min
Aug 6, 6:38 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	37 min
Aug 6, 6:51 PM CDT	Special Weather Statement	ABR	Lyman	24 min
Aug 6, 3:15 PM CDT	Special Weather Statement	ABR	Traverse	45 min
Aug 6, 3:36 PM CDT	Special Weather Statement	ABR	Traverse	24 min
Aug 6, 3:52 PM CDT	Special Weather Statement	ABR	Big Stone	38 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.