Alert archive / South Dakota / Flash Flood Watches in 2018

Flash Flood Watch 1, NWS Aberdeen, SD

June 16, 201818 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this flash flood watch at Jun 16, 2018, 3:00 PM CDT for 18 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Jun 16, 2018, 7:00 PM CDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Jun 16, 2018, 3:00 PM CDT (20:00 UTC)
In effect from: Jun 16, 2018, 7:00 PM CDT
Expired: Jun 17, 2018, 5:40 AM CDT
In force: 11 hr
Issued by: NWS Aberdeen, SD
Flood severity: None

Counties Big Stone County, MN, Traverse County, MN, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Marshall County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Stanley County, SD, Sully County, SD

The radar

The Aberdeen radar (KABR), 55 km from the middle of the area, began a volume at 20:01 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, 8.0 hours before the alert went out and 17 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: 177 J/kg
Mixed-layer CIN: -361 J/kg
Mixed-layer LCL: 1088 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 283 m²/s²
0-3 km storm-relative helicity: 383 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jun 16, 12:38 PM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Jun 16, 12:38 PM CDT, 2 hours 22 minutes before

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Hazardous weather outlook, Jun 16, 5:46 AM CDT, 9 hours 14 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
546 AM CDT Sat Jun 16 2018

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-171100-
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-
546 AM CDT Sat Jun 16 2018 /446 AM MDT Sat Jun 16 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

Early morning storms will move across northeast South Dakota.
Widespread severe weather is not anticipated though we can not
rule out an isolated severe storm or two, with the risk being
mainly in the form of hail and gusty winds.

The main threat for severe weather appears to be highlighted
between 5 PM CDT this afternoon and 11 PM CDT tonight, in the form
of large hail, damaging winds and possibly a tornado or two. The
severe weather threat currently looks to reside east of a line
from roughly Leola to Redfield. By late evening into the late
night hours, the severe weather threat transitions to heavy rain
and a potential flooding risk.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

A severe weather threat of heavy rain exists on Sunday.

.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.

Dorn

In the hours before

Local storm report, Jun 16, 9:14 AM CDT, 5 hours 46 minutes before

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Local storm report, Jun 16, 9:20 AM CDT, 5 hours 40 minutes before

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Local storm report, Jun 16, 9:41 AM CDT, 5 hours 19 minutes before

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Local storm report, Jun 16, 10:16 AM CDT, 4 hours 44 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
Jun 16, 4:54 AM CDT	Special Weather Statement	ABR	Clark	36 min
Jun 16, 5:26 AM CDT	Special Weather Statement	ABR	Clark	49 min
Jun 16, 5:50 AM CDT	Special Weather Statement	ABR	Spink	25 min
Jun 16, 8:24 AM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	51 min
Jun 16, 8:53 AM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	52 min
Jun 16, 6:23 PM CDT	Special Weather Statement	ABR	Hamlin	52 min
Jun 16, 6:24 PM CDT	Special Weather Statement	ABR	Hyde	51 min
Jun 16, 6:31 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Deuel, Hamlin	44 min
Jun 16, 6:32 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Hyde, Sully	43 min
Jun 16, 6:59 PM CDT	Special Weather Statement	ABR	Deuel	31 min

Nearby

Flash Flood Watches in South Dakota, 2018 Flash Flood Watches in Minnesota, 2018 Every flash flood watch 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.