Alert archive / South Dakota / Flash Flood Watches in 2015

Flash Flood Watch 4, NWS Aberdeen, SD

August 6, 20156 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this flash flood watch at Aug 6, 2015, 11:07 AM CDT for 6 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Aug 6, 2015, 1:00 PM CDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Aug 6, 2015, 11:07 AM CDT (16:07 UTC)
In effect from: Aug 6, 2015, 1:00 PM CDT
Expired: Aug 6, 2015, 6:17 PM CDT
In force: 5 hr
Issued by: NWS Aberdeen, SD
Flood severity: None

Counties Big Stone County, MN, Traverse County, MN, Brown County, SD, Day County, SD, Edmunds County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 55 km from the middle of the area, began a volume at 16:09 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, 4.1 hours before the alert went out and 93 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: 638 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 25 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 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 Aug 6, 7:44 AM CDT, 3 hours 23 minutes earlier.

Area forecast discussion, Aug 6, 7:44 AM CDT, 3 hours 23 minutes before

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Hazardous weather outlook, Aug 6, 4:35 AM CDT, 6 hours 32 minutes before

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In the hours before

Local storm report, Aug 6, 8:19 AM CDT, 2 hours 48 minutes before

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Local storm report, Aug 6, 8:27 AM CDT, 2 hours 40 minutes before

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Local storm report, Aug 6, 8:28 AM CDT, 2 hours 39 minutes before

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Local storm report, Aug 6, 9:22 AM CDT, 1 hour 45 minutes before

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Local storm report, Aug 6, 9:24 AM CDT, 1 hour 43 minutes before

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Local storm report, Aug 6, 9:49 AM CDT, 1 hour 18 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
Aug 5, 11:42 PM CDT	Special Weather Statement	ABR	Brown	48 min
Aug 6, 12:02 AM CDT	Severe Thunderstorm Warning	ABR	Brown	26 min
Aug 6, 12:31 AM CDT	Special Weather Statement	ABR	Brown	59 min
Aug 6, 12:51 AM CDT	Severe Thunderstorm Warning	ABR	Brown	39 min
Aug 6, 1:30 AM CDT	Severe Thunderstorm Warning	ABR	Brown, Day, Marshall	60 min
Aug 6, 2:28 AM CDT	Special Weather Statement	ABR	Day	62 min
Aug 6, 3:21 AM CDT	Flash Flood Warning	ABR	Brown	6 hr
Aug 6, 9:26 AM CDT	Areal Flood Warning	ABR	Brown	24 hr
Aug 6, 2:49 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Hamlin	56 min
Aug 6, 3:16 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Deuel, Hamlin	43 min
Aug 6, 4:39 PM CDT	Special Weather Statement	ABR	Deuel	21 min
Aug 6, 5:10 PM CDT	Areal Flood Warning	ABR	Deuel	6 hr

Nearby

Flash Flood Watches in South Dakota, 2015 Flash Flood Watches in Minnesota, 2015 Every flash flood watch in 2015

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.