Alert archive / South Dakota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 101, NWS Aberdeen, SD

July 17, 2017Buffalo County, Lyman County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 17, 2017, 7:12 PM CDT for Buffalo County, Lyman County, South Dakota. It was in force for 63 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 17, 2017, 7:12 PM CDT (00:12 UTC)
Expired: Jul 17, 2017, 8:15 PM CDT
In force: 63 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Buffalo County, SD, Lyman County, SD

The radar

The Aberdeen radar (KABR), 186 km from the middle of the area, began a volume at 00:12 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 00:00Z, 0.2 hours before the alert went out and 135 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: 486 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 3095 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 17, 6:40 PM CDT, 32 minutes earlier.

Area forecast discussion, Jul 17, 6:40 PM CDT, 32 minutes before

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Hazardous weather outlook, Jul 17, 3:37 AM CDT, 15 hours 35 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
337 AM CDT Mon Jul 17 2017

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-180845-
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-
337 AM CDT Mon Jul 17 2017 /237 AM MDT Mon Jul 17 2017/

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

Hot air across the area will allow for temperatures to top out in
the upper 90s to over 100 degrees. There is also a touch of
humidity to the air and heat index values may also top 100
degrees for an hour or two this afternoon.

We will also see breezy conditions, mainly east of the Missouri
river. Wind gusts between 20 and 30mph, when combined with the hot
temperatures and drought conditions will also result in High to
Very High grassland fire danger today.

Additionally, A front moving across the area will generate
thunderstorms capable of producing strong winds and large hail.
The threat will be focused mainly across eastern and central South
Dakota today, moving east this evening and during the early
overnight hours.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

An active weather pattern is expected for the area through most of
the work week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested late this afternoon and
through the evening.

Connelly

In the hours before

Special weather statement, Jul 17, 6:33 PM CDT, 39 minutes before

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Local storm report, Jul 17, 6:36 PM CDT, 36 minutes before

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Special weather statement, Jul 17, 6:40 PM CDT, 32 minutes before

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Special weather statement, Jul 17, 6:43 PM CDT, 29 minutes before

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Local storm report, Jul 17, 6:45 PM CDT, 27 minutes before

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Special weather statement, Jul 17, 6:53 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
Jul 17, 7:05 PM CDT	Severe Thunderstorm Warning	ABR	Clark	25 min
Jul 17, 8:39 PM CDT	Special Weather Statement	ABR	Brule	21 min
Jul 18, 2:18 AM CDT	Special Weather Statement	ABR	Corson	57 min
Jul 18, 3:26 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Edmunds, McPherson, Walworth	64 min
Jul 18, 4:36 AM CDT	Special Weather Statement	ABR	Edmunds, McPherson	54 min
Jul 18, 5:38 AM CDT	Special Weather Statement	ABR	Brown, Spink	52 min
Jul 18, 3:03 PM CDT	Heat Advisory	ABR	Buffalo, Hand, Hughes, Hyde, Jones, Lyman and 2 more	29 hr

Nearby

Severe Thunderstorm Warnings in South Dakota, 2017 Every severe thunderstorm warning in 2017

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.