Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 36, NWS Aberdeen, SD

May 24, 2018Lyman County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at May 24, 2018, 6:55 PM CDT for Lyman County, South Dakota. It was in force for 35 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: May 24, 2018, 6:55 PM CDT (23:55 UTC)
Expired: May 24, 2018, 7:30 PM CDT
In force: 35 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 23:58 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

Aberdeen, SD (KABR), launched 12:00Z, 11.9 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: 23 J/kg
Mixed-layer CIN: -396 J/kg
Mixed-layer LCL: 1740 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 24 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 May 24, 6:24 PM CDT, 31 minutes earlier.

Area forecast discussion, May 24, 6:24 PM CDT, 31 minutes before

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Hazardous weather outlook, May 24, 4:20 AM CDT, 14 hours 35 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
420 AM CDT Thu May 24 2018

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-250930-
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-
420 AM CDT Thu May 24 2018 /320 AM MDT Thu May 24 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

Thunderstorms are possible again this afternoon and evening,
mainly east of the Missouri River. Some storms could be strong to
severe with large hail and strong winds, especially across
northeast South Dakota and west central Minnesota.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

On and off thunderstorm chances are in the forecast this weekend
into early next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be necessary this afternoon and evening
east of the Missouri River.

TMT

In the hours before

Special weather statement, May 24, 5:11 PM CDT, 1 hour 44 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
511 PM CDT THU MAY 24 2018

SDZ048-242245-
Lyman SD-
511 PM CDT THU MAY 24 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LYMAN COUNTY UNTIL 545 PM
CDT...

At 510 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles north of Hamill, or 20 miles west of Chamberlain, moving
northeast at 20 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Lyman and Lake Francis Case.

LAT...LON 4374 9962 4374 9964 4377 9965 4373 9967
      4375 9968 4376 9968 4376 9969 4372 9972
      4375 9974 4374 9976 4371 9975 4369 9984
      4370 9986 4367 9987 4370 9990 4370 9994
      4381 9984 4390 9972 4378 9945 4360 9962
TIME...MOT...LOC 2210Z 223DEG 19KT 4373 9972

Telken

Special weather statement, May 24, 5:59 PM CDT, 56 minutes before

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Special weather statement, May 24, 6:13 PM CDT, 42 minutes before

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Special weather statement, May 24, 6:36 PM CDT, 19 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
May 23, 7:52 PM CDT	Special Weather Statement	ABR	McPherson	23 min
May 23, 10:17 PM CDT	Special Weather Statement	ABR	Jones	43 min
May 23, 10:29 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Stanley	46 min
May 23, 11:12 PM CDT	Special Weather Statement	ABR	Dewey	48 min
May 24, 12:40 AM CDT	Special Weather Statement	ABR	Edmunds, Faulk, McPherson	50 min
May 24, 12:56 AM CDT	Special Weather Statement	ABR	Corson	49 min
May 24, 5:11 PM CDT	Special Weather Statement	ABR	Lyman	34 min
May 24, 5:18 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	42 min
May 24, 5:59 PM CDT	Special Weather Statement	ABR	Lyman	31 min
May 24, 6:13 PM CDT	Special Weather Statement	ABR	Hand	47 min
May 24, 6:36 PM CDT	Special Weather Statement	ABR	Big Stone	24 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.