Alert archive / South Dakota / Flash Flood Warnings in 2015

Flash Flood Warning 19, NWS Sioux Falls, SD

October 23, 2015Lincoln County, Minnehaha County, Turner County, South Dakota

NWS Sioux Falls, SD issued this flash flood warning at Oct 23, 2015, 4:18 PM CDT for Lincoln County, Minnehaha County, Turner County, South Dakota. It was in force for 3 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
Oct 23, 2015, 4:18 PM CDT (21:18 UTC)
Expired
Oct 23, 2015, 7:15 PM CDT
In force
3 hr
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Flood severity
None

Counties Lincoln County, SD, Minnehaha County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 22 km from the middle of the area, began a volume at 21:18 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

Omaha, NE (KOAX), launched 12:00Z, 9.3 hours before the alert went out and 237 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2015-10-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 28 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2015-10-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 240 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
28 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
554 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
240 m²/s²
0-3 km storm-relative helicity
233 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 23, 5:43 PM CDTTornado Warning Tornado observedFSDSioux32 min
Oct 23, 5:45 PM CDTTornado WarningFSDCherokee30 min
Oct 23, 5:47 PM CDTTornado WarningFSDPlymouth28 min
Oct 23, 6:08 PM CDTTornado Warning Tornado observedFSDO'Brien37 min
Oct 23, 6:12 PM CDTTornado WarningFSDPlymouth, Sioux33 min
Oct 23, 6:16 PM CDTTornado WarningFSDCherokee, O'Brien29 min
Oct 23, 6:42 PM CDTTornado Warning Tornado observedFSDO'Brien14 min
Oct 23, 6:44 PM CDTTornado WarningFSDO'Brien, Osceola31 min

Nearby

Flash Flood Warnings in South Dakota, 2015Every flash flood warning 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.