Alert archive / South Dakota / Special Weather Statements in 2021

Special Weather Statement, NWS Aberdeen, SD

July 9, 2021Dewey County, South Dakota

NWS Aberdeen, SD issued this special weather statement at Jul 9, 2021, 1:46 AM MDT for Dewey County, South Dakota. It was in force for 44 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: Jul 9, 2021, 1:46 AM MDT (07:46 UTC)
Expired: Jul 9, 2021, 2:30 AM MDT
In force: 44 min
Issued by: NWS Aberdeen, SD

County Dewey County, SD

The radar

The Bismarck radar (KBIS), 162 km from the middle of the area, began a volume at 07:48 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 7.8 hours before the alert went out and 163 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: 624 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1380 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.8

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 Jul 9, 1:25 AM MDT, 21 minutes earlier.

Area forecast discussion, Jul 9, 1:25 AM MDT, 21 minutes before

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Hazardous weather outlook, Jul 8, 3:27 PM MDT, 10 hours 19 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
427 PM CDT Thu Jul 8 2021

SDZ003>005-009-010-015>017-033>037-045-048-051-092130-
Corson-Campbell-McPherson-Walworth-Edmunds-Dewey-Potter-Faulk-
Stanley-Sully-Hughes-Hyde-Hand-Jones-Lyman-Buffalo-
427 PM CDT Thu Jul 8 2021 /327 PM MDT Thu Jul 8 2021/

This Hazardous Weather Outlook is for central South Dakota and
north central South Dakota.

.DAY ONE...Tonight.

Scattered thunderstorms are expected. A few may become strong to
severe late this evening into the overnight hours. The highest chance
for large hail of 2 inches in diameter or greater, or winds over 75
mph, will be near and west of the Missouri River.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Showers and thunderstorms will remain possible, mainly Friday evening
into Saturday morning. The threat for strong to severe storms will
likely be along and south of I-90.

.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.

MNZ039-046-SDZ006>008-011-018>023-092130-
Traverse-Big Stone-Brown-Marshall-Roberts-Day-Spink-Clark-Codington-
Grant-Hamlin-Deuel-
427 PM CDT Thu Jul 8 2021

This Hazardous Weather Outlook is for west central Minnesota and
northeast South Dakota.

.DAY ONE...Tonight.

Scattered thunderstorms will be possible, mainly overnight. A few
may become strong to severe, with gusty winds and mainly small hail.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Showers and thunderstorms will remain possible, mainly Friday evening
into Saturday morning. Severe weather is not 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.

KF

In the hours before

Special weather statement, Jul 9, 1:46 AM MDT, 0 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 8, 8:35 PM MDT	Severe Thunderstorm Warning	ABR	Dewey	26 min
Jul 8, 9:45 PM MDT	Severe Thunderstorm Warning	ABR	Corson	45 min
Jul 8, 10:22 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	53 min
Jul 9, 3:17 AM MDT	Severe Thunderstorm Warning	ABR	Dewey, Sully	27 min

Nearby

Special Weather Statements in South Dakota, 2021 Every special weather statement in 2021

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.