Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 160, NWS Aberdeen, SD

July 18, 2018Stanley County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 18, 2018, 2:30 PM MDT for Stanley County, South Dakota. It was in force for 49 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, 2:30 PM MDT (20:30 UTC)
Expired: Jul 18, 2018, 3:19 PM MDT
In force: 49 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Stanley County, SD

The radar

The Rapid City radar (KUDX), 170 km from the middle of the area, began a volume at 20:31 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, 8.5 hours before the alert went out and 175 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: 1200 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 92 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, 11:56 AM MDT, 2 hours 34 minutes earlier.

Area forecast discussion, Jul 18, 11:56 AM MDT, 2 hours 34 minutes before

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Hazardous weather outlook, Jul 18, 3:30 AM MDT, 11 hours 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, 10:17 AM MDT, 4 hours 13 minutes before

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Local storm report, Jul 18, 12:36 PM MDT, 1 hour 54 minutes before

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Special weather statement, Jul 18, 2:17 PM MDT, 13 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
Jul 18, 9:32 AM MDT	Areal Flood Warning	ABR	Dewey	3 hr
Jul 18, 10:17 AM MDT	Special Weather Statement	ABR	Lyman	43 min
Jul 18, 10:27 AM MDT	Severe Thunderstorm Warning	ABR	Lyman	27 min
Jul 18, 2:17 PM MDT	Special Weather Statement	ABR	Stanley	43 min
Jul 18, 2:51 PM MDT	Special Weather Statement	ABR	Dewey	39 min
Jul 18, 3:35 PM MDT	Special Weather Statement	ABR	Stanley	40 min
Jul 18, 3:40 PM MDT	Special Weather Statement	ABR	Hand	50 min
Jul 18, 4:04 PM MDT	Special Weather Statement	ABR	Stanley	41 min
Jul 18, 4:21 PM MDT	Severe Thunderstorm Warning	ABR	Hand	52 min
Jul 18, 4:24 PM MDT	Special Weather Statement	ABR	Hughes	51 min
Jul 18, 4:29 PM MDT	Special Weather Statement	ABR	Lyman	61 min
Jul 18, 4:33 PM MDT	Severe Thunderstorm Warning	ABR	Hughes	29 min
Jul 18, 4:42 PM MDT	Severe Thunderstorm Warning	ABR	Hand	30 min
Jul 18, 4:45 PM MDT	Special Weather Statement	ABR	Dewey	60 min
Jul 18, 5:05 PM MDT	Special Weather Statement	ABR	Lyman	25 min
Jul 18, 5:18 PM MDT	Severe Thunderstorm Warning	ABR	Lyman	42 min
Jul 18, 5:30 PM MDT	Special Weather Statement	ABR	Spink	30 min
Jul 18, 5:34 PM MDT	Special Weather Statement	ABR	Lyman	41 min
Jul 18, 5:43 PM MDT	Severe Thunderstorm Warning	ABR	Lyman	47 min
Jul 18, 5:48 PM MDT	Special Weather Statement	ABR	Dewey	42 min
Jul 18, 5:55 PM MDT	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.