Alert archive / South Dakota / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 155, NWS Aberdeen, SD

August 15, 2019Clark County, Codington County, Hamlin County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 15, 2019, 5:24 PM CDT for Clark County, Codington County, Hamlin County, South Dakota. It was in force for 51 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 15, 2019, 5:24 PM CDT (22:24 UTC)
Expired: Aug 15, 2019, 6:15 PM CDT
In force: 51 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Clark County, SD, Codington County, SD, Hamlin County, SD

The radar

The Aberdeen radar (KABR), 107 km from the middle of the area, began a volume at 22:27 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 15, 3:09 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.4 hours before the alert went out and 82 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: 1279 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 113 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 15, 1:07 PM CDT, 4 hours 17 minutes earlier.

Area forecast discussion, Aug 15, 1:07 PM CDT, 4 hours 17 minutes before

Area Forecast Discussion
National Weather Service Aberdeen SD
107 PM CDT Thu Aug 15 2019

.DISCUSSION...
Issued at 107 PM CDT Thu Aug 15 2019

Showers and thunderstorms quickly intensified near the central ND/SD
border after 17Z as the shortwave caught up to the surface low/cold
front. Discrete cells look to be the theme for the next couple of
hours with bulk shear of around 30-35kts, before more of a linear
look/wind threat emerges. This is similar to the latest CAM
solutions. At this point, the timing would bring the higher
potential for strong storms to ABR 2100-2230Z, and ATY 2300-0030Z,
before exiting into MN. Any thunderstorm could easily produce a
quick 0.5in or more, with PW values maxing out around 1.6in along
the line of strong storms.

Dry air will quickly push in behind the surface trough, but not dry
enough to diminish the potential for 09-14Z fog across E SD
(Sisseton Hills/ATY areas). Otherwise, the next chance of more
widespread precipitation will hold off until Saturday afternoon
through Sunday night with the 500mb trough digging trough while the
main low pushes across south central Canada. The nearly stacked sfc-
500mb low will drag a cold front across western SD Saturday morning.
This boundary will sink to our southeast shortly after 00Z Sunday.
With instability diminishing pretty quickly over the west, the
chance of thunderstorms was diminished when our chance of moderate
to heavy rain is expected. This will be 00-06Z Sunday. At this point
we're forecasting 0.25-0.50in of liquid, but will will continue to
monitor this time period as thunderstorms could bring more rain to
eastern SD and western MN.

From 12Z Sunday through Thursday, we'll have a couple of period of
slight chance pops. However, nothing is indicating either widespread
of heavy precipitation at this time. The main trend will be a return
of near normal/seasonal temperatures for Monday through Thursday.

A couple systems to deal with at the start of the extended period.
First weak wave moves through Friday night, and has appeared to
weaken in recent model runs. A larger system looks to move through
Saturday into Saturday night. Models are showing a stronger
shortwave along with a surface cold front. Have increased POPs a bit
above NBM. Concerning temperatures, models are still showing a warm
up early next week, with highs back into the 80s across the region.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday Afternoon)
Issued at 1226 PM CDT Thu Aug 15 2019

Starting with VFR ceilings and vis this afternoon, with showers
and thunderstorms quickly developing along the ND/SD border
already at 17Z. Expecting discrete cells early this afternoon to
become more linear, with more of a wind threat as they move closer
to ATY. The highest confidence in thunderstorms is at ABR 21-22Z,
so have added the potential of TS. At this point we expect TS
activity to exit southeast by around 01Z. The concern overnight
into the mid morning hours will be the potential for fog. Added
MVFR ceilings/vis with the mention of fog where it will be most
likely, near ATY.

&&

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

DISCUSSION...KF
AVIATION...KF

Hazardous weather outlook, Aug 15, 4:34 PM CDT, 50 minutes before

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In the hours before

Local storm report, Aug 15, 4:05 PM CDT, 1 hour 19 minutes before

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Local storm report, Aug 15, 4:23 PM CDT, 1 hour 1 minute before

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Special weather statement, Aug 15, 4:24 PM CDT, 1 hour before

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Local storm report, Aug 15, 4:42 PM CDT, 42 minutes before

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Special weather statement, Aug 15, 4:43 PM CDT, 41 minutes before

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Local storm report, Aug 15, 5:14 PM CDT, 10 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 15, 12:26 PM CDT	Special Weather Statement	ABR	Corson	49 min
Aug 15, 1:39 PM CDT	Special Weather Statement	ABR	Campbell	36 min
Aug 15, 2:51 PM CDT	Severe Thunderstorm Warning	ABR	Jones	17 min
Aug 15, 3:39 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman, Stanley	36 min
Aug 15, 3:49 PM CDT	Special Weather Statement	ABR	Brown	41 min
Aug 15, 4:10 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	20 min
Aug 15, 4:24 PM CDT	Special Weather Statement	ABR	Brown	51 min
Aug 15, 4:43 PM CDT	Special Weather Statement	ABR	Spink	47 min
Aug 15, 5:12 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Day, Marshall	48 min
Aug 15, 5:30 PM CDT	Severe Thunderstorm Warning	ABR	Day, Marshall, Roberts	45 min
Aug 15, 5:46 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Day, Grant, Roberts	44 min
Aug 15, 5:56 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Deuel, Grant, Hamlin	49 min
Aug 15, 6:28 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Deuel, Grant, Hamlin	47 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2019 Every severe thunderstorm warning in 2019

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.