Alert archive / South Dakota / Flash Flood Watches in 2007

Flash Flood Watch 4, NWS Aberdeen, SD

June 11, 200726 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this flash flood watch at Jun 11, 2007, 1:22 PM CDT for 26 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Jun 12, 2007, 1:00 PM CDT. It was in force for 27 hr.

The area

The counties it named.

The facts

Issued: Jun 11, 2007, 1:22 PM CDT (18:22 UTC)
In effect from: Jun 12, 2007, 1:00 PM CDT
Expired: Jun 13, 2007, 3:39 PM CDT
In force: 27 hr
Issued by: NWS Aberdeen, SD
Flood severity: None

All 28 counties

Big Stone County, MN, Traverse County, MN, Brown County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Day County, SD, Deuel County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 56 km from the middle of the area, began a volume at 18:22 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

Rapid City, SD (KUNR), launched 12:00Z, 6.4 hours before the alert went out and 341 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: 114 J/kg
Mixed-layer CIN: -470 J/kg
Mixed-layer LCL: 2676 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 55 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 Jun 11, 10:34 AM CDT, 2 hours 48 minutes earlier.

Area forecast discussion, Jun 11, 10:34 AM CDT, 2 hours 48 minutes before

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Hazardous weather outlook, Jun 11, 5:12 AM CDT, 8 hours 10 minutes before

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In the hours before

Local storm report, Jun 11, 8:31 AM CDT, 4 hours 51 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 10, 10:23 PM CDT	Severe Thunderstorm Warning	ABR	Corson	52 min
Jun 10, 11:04 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson	41 min
Jun 10, 11:15 PM CDT	Severe Thunderstorm Warning	ABR	Corson	45 min
Jun 10, 11:27 PM CDT	Severe Thunderstorm Warning	ABR	Campbell	22 min
Jun 10, 11:54 PM CDT	Severe Thunderstorm Warning	ABR	Corson	36 min
Jun 11, 12:45 AM CDT	Severe Thunderstorm Warning	ABR	McPherson	30 min
Jun 11, 1:21 AM CDT	Severe Thunderstorm Warning	ABR	McPherson	24 min
Jun 11, 6:19 PM CDT	Severe Thunderstorm Warning	ABR	Corson	56 min
Jun 11, 6:49 PM CDT	Severe Thunderstorm Warning	ABR	Dewey	56 min
Jun 10, 7:59 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	30 min

Nearby

Flash Flood Watches in South Dakota, 2007 Flash Flood Watches in Minnesota, 2007 Every flash flood watch in 2007

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.