Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 164, NWS Aberdeen, SD

July 18, 2018Lyman County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 18, 2018, 6:18 PM CDT for Lyman County, South Dakota. It was in force for 42 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: Jul 18, 2018, 6:18 PM CDT (23:18 UTC)
Expired: Jul 18, 2018, 7:00 PM CDT
In force: 42 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Lyman County, SD

The radar

The Aberdeen radar (KABR), 207 km from the middle of the area, began a volume at 23:19 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
Jul 18, 3:43 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.3 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1815 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -90 m²/s²
0-3 km storm-relative helicity: -9 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 Jul 18, 3:35 PM CDT, 2 hours 43 minutes earlier.

Area forecast discussion, Jul 18, 3:35 PM CDT, 2 hours 43 minutes before

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Hazardous weather outlook, Jul 18, 4:30 AM CDT, 13 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
430 AM CDT Wed Jul 18 2018

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-190930-
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-
430 AM CDT Wed Jul 18 2018 /330 AM MDT Wed Jul 18 2018/

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

.DAY ONE...Today and Tonight

Areas of showers and thunderstorms are expected across the region
this afternoon and evening. A few storms could be on the strong
side with hail, gusty winds, and heavy rain. Also, there is an
isolated tornado threat over south central South Dakota.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

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.

TMT

In the hours before

Special weather statement, Jul 18, 5:45 PM CDT, 33 minutes before

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Local storm report, Jul 18, 5:48 PM CDT, 30 minutes before

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Local storm report, Jul 18, 5:49 PM CDT, 29 minutes before

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Local storm report, Jul 18, 6:05 PM CDT, 13 minutes before

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Special weather statement, Jul 18, 6:05 PM CDT, 13 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
605 PM CDT WED JUL 18 2018

SDZ048-182330-
Lyman SD-
605 PM CDT WED JUL 18 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LYMAN COUNTY UNTIL
630 PM CDT...

At 605 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles northeast of Vivian, or 11 miles northwest of Presho, moving
east at 10 mph.

Nickel 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 Lyman
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A Tornado Watch remains in effect until 1100 PM CDT for central South
Dakota.

LAT...LON 4402 10031 4409 10031 4415 10006 4394 10005
TIME...MOT...LOC 2305Z 269DEG 10KT 4404 10021

KF

Local storm report, Jul 18, 6:14 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
614 PM CDT WED JUL 18 2018

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

0539 PM     TSTM WND GST     2 ENE PIERRE            44.38N 100.28W
07/18/2018  M59 MPH          HUGHES             SD   ASOS

&&

JT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 10:32 AM CDT	Areal Flood Warning	ABR	Dewey	3 hr
Jul 18, 11:17 AM CDT	Special Weather Statement	ABR	Lyman	43 min
Jul 18, 11:27 AM CDT	Severe Thunderstorm Warning	ABR	Lyman	27 min
Jul 18, 3:17 PM CDT	Special Weather Statement	ABR	Stanley	43 min
Jul 18, 3:30 PM CDT	Severe Thunderstorm Warning	ABR	Stanley	49 min
Jul 18, 3:51 PM CDT	Special Weather Statement	ABR	Dewey	39 min
Jul 18, 4:35 PM CDT	Special Weather Statement	ABR	Stanley	40 min
Jul 18, 4:40 PM CDT	Special Weather Statement	ABR	Hand	50 min
Jul 18, 5:04 PM CDT	Special Weather Statement	ABR	Stanley	41 min
Jul 18, 5:21 PM CDT	Severe Thunderstorm Warning	ABR	Hand	52 min
Jul 18, 5:24 PM CDT	Special Weather Statement	ABR	Hughes	51 min
Jul 18, 5:29 PM CDT	Special Weather Statement	ABR	Lyman	61 min
Jul 18, 5:33 PM CDT	Severe Thunderstorm Warning	ABR	Hughes	29 min
Jul 18, 5:42 PM CDT	Severe Thunderstorm Warning	ABR	Hand	30 min
Jul 18, 5:45 PM CDT	Special Weather Statement	ABR	Dewey	60 min
Jul 18, 6:05 PM CDT	Special Weather Statement	ABR	Lyman	25 min
Jul 18, 6:30 PM CDT	Special Weather Statement	ABR	Spink	30 min
Jul 18, 6:34 PM CDT	Special Weather Statement	ABR	Lyman	41 min
Jul 18, 6:43 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	47 min
Jul 18, 6:48 PM CDT	Special Weather Statement	ABR	Dewey	42 min
Jul 18, 6:55 PM CDT	Severe Thunderstorm Warning	ABR	Hand	35 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.