Alert archive / South Dakota / Flash Flood Warnings in 2008

Flash Flood Warning 4, NWS Aberdeen, SD

July 18, 2008Dewey County, South Dakota

NWS Aberdeen, SD issued this flash flood warning at Jul 18, 2008, 11:08 PM MDT for Dewey County, South Dakota. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 18, 2008, 11:08 PM MDT (05:08 UTC)
Expired: Jul 19, 2008, 5:00 AM MDT
In force: 6 hr
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Flood severity: None

County Dewey County, SD

The radar

The Bismarck radar (KBIS), 180 km from the middle of the area, began a volume at 05:09 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

Rapid City, SD (KUNR), launched 00:00Z, 5.1 hours before the alert went out and 200 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: 796 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 1821 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 warning went out at Jul 18, 2:58 PM MDT, 8 hours 10 minutes earlier.

Area forecast discussion, Jul 18, 2:58 PM MDT, 8 hours 10 minutes before

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Hazardous weather outlook, Jul 18, 2:37 AM MDT, 20 hours 31 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 18, 6:20 PM MDT	Severe Thunderstorm Warning	ABR	Corson	40 min
Jul 18, 7:01 PM MDT	Severe Thunderstorm Warning	ABR	Corson	29 min
Jul 18, 7:28 PM MDT	Severe Thunderstorm Warning	ABR	Dewey	62 min
Jul 18, 8:29 PM MDT	Severe Thunderstorm Warning	ABR	Dewey	61 min
Jul 18, 9:23 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Sully	67 min
Jul 18, 10:05 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley, Sully	55 min
Jul 18, 10:54 PM MDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley, Sully	51 min
Jul 18, 11:16 PM MDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	44 min
Jul 18, 11:41 PM MDT	Severe Thunderstorm Warning	ABR	Buffalo, Hand, Hughes, Hyde, Lyman, Stanley and 1 more	64 min
Jul 18, 11:48 PM MDT	Areal Flood Advisory	ABR	Potter, Sully	6 hr
Jul 19, 12:20 AM MDT	Severe Thunderstorm Warning	ABR	Buffalo, Hand, Hyde	35 min
Jul 19, 3:02 AM MDT	Areal Flood Advisory	ABR	Brown, Faulk, Spink	3 hr
Jul 19, 5:37 PM MDT	Severe Thunderstorm Warning	ABR	Campbell, McPherson	53 min

Nearby

Flash Flood Warnings in South Dakota, 2008 Every flash flood warning in 2008

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.