Alert archive / South Dakota / Special Weather Statements in 2017

Special Weather Statement, NWS Aberdeen, SD

August 9, 2017Deuel County, South Dakota

NWS Aberdeen, SD issued this special weather statement at Aug 9, 2017, 6:56 PM CDT for Deuel County, South Dakota. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 9, 2017, 6:56 PM CDT (23:56 UTC)
Expired
Aug 9, 2017, 8:00 PM CDT
In force
64 min
Issued by
NWS Aberdeen, SD

County Deuel County, SD

The radar

The Sioux Falls radar (KFSD), 134 km from the middle of the area, began a volume at 23:59 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 118 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-pSkew-T log-p diagram, Aberdeen, SD at 12:00Z on 2017-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 352 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2017-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
352 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
856 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 9, 6:29 PM CDT, 27 minutes earlier.

Area forecast discussion, Aug 9, 6:29 PM CDT, 27 minutes before
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Hazardous weather outlook, Aug 9, 3:20 AM CDT, 15 hours 36 minutes before
Hazardous Weather Outlook
National Weather Service Aberdeen SD
320 AM CDT Wed Aug 9 2017

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-101200-
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-
320 AM CDT Wed Aug 9 2017 /220 AM MDT Wed Aug 9 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

Isolated thunderstorms are possible this morning east of the
Missouri river. Lightning will be the primary threat with any
thunderstorms.

Strong to severe thunderstorms are possible from mid afternoon
through early evening, mainly east of a line from McIntosh and
Mobridge to Miller. The strongest storms may produce hail around
one inch in diameter and wind gusts to 60 mph.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thunderstorms are possible Friday night into Saturday night. An
isolated severe storm may occur during that period.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed over northeast South Dakota and
west central Minnesota this afternoon and evening.

SRF

In the hours before

Special weather statement, Aug 9, 6:00 PM CDT, 56 minutes before
Special Weather Statement
National Weather Service Aberdeen SD
600 PM CDT WED AUG 9 2017

SDZ007-008-011-092345-
Marshall SD-Day SD-Roberts SD-
600 PM CDT WED AUG 9 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN ROBERTS...
NORTHEASTERN DAY AND SOUTHEASTERN MARSHALL COUNTIES UNTIL 645 PM
CDT...

At 559 PM CDT, Doppler radar was tracking a strong thunderstorm over
Enemy Swim Housing, or 13 miles northeast of Webster, moving east at
30 mph.

Nickel size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Wilmot, Peever, Grenville, Peever Flats Housing, Agency Village,
Finley Heights Housing, Enemy Swim Housing, Waubay Lake, Rudebusch
Corner, Waubay Wildlife Rec Area, Enemy Swim Lake, Campbell Slough,
Pickerel Lake Rec Area and Piyas Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Aberdeen.

&&

LAT...LON 4555 9680 4554 9679 4533 9687 4541 9742
      4558 9737
TIME...MOT...LOC 2259Z 274DEG 28KT 4546 9730

TMT
Special weather statement, Aug 9, 6:23 PM CDT, 33 minutes before
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Local storm report, Aug 9, 6:42 PM CDT, 14 minutes before
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Special weather statement, Aug 9, 6:43 PM CDT, 13 minutes before
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Local storm report, Aug 9, 6:56 PM CDT, 0 minutes before
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Special weather statement, Aug 9, 6:56 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 5:36 PM CDTSpecial Weather StatementABRDay24 min
Aug 9, 6:00 PM CDTSpecial Weather StatementABRRoberts45 min
Aug 9, 6:06 PM CDTSevere Thunderstorm WarningABRDay, Grant, Roberts19 min
Aug 9, 6:23 PM CDTSpecial Weather StatementABRCodington52 min
Aug 9, 6:28 PM CDTSevere Thunderstorm WarningABRCodington, Deuel, Grant47 min
Aug 9, 6:43 PM CDTSpecial Weather StatementABRGrant47 min

Nearby

Special Weather Statements in South Dakota, 2017Every special weather statement 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.