Alert archive / South Dakota / Areal Flood Warnings in 2019

Areal Flood Warning 13, NWS Sioux Falls, SD

August 2, 2019Brule County, Charles Mix County, Gregory County, South Dakota

NWS Sioux Falls, SD issued this areal flood warning at Aug 2, 2019, 10:44 AM CDT for Brule County, Charles Mix County, Gregory 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: Aug 2, 2019, 10:44 AM CDT (15:44 UTC)
Expired: Aug 2, 2019, 4:45 PM CDT
In force: 6 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Brule County, SD, Charles Mix County, SD, Gregory County, SD

The radar

The Sioux Falls radar (KFSD), 181 km from the middle of the area, began a volume at 15:47 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 3.7 hours before the alert went out and 284 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: 733 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this areal flood warning went out at Aug 2, 5:48 AM CDT, 4 hours 56 minutes earlier.

Area forecast discussion, Aug 2, 5:48 AM CDT, 4 hours 56 minutes before

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Hazardous weather outlook, Aug 2, 4:10 AM CDT, 6 hours 34 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
410 AM CDT Fri Aug 2 2019

NEZ013-014-SDZ038>040-050-052>071-030915-
Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn-
Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-
Charles Mix-Douglas-Hutchinson-Turner-Lincoln-Bon Homme-Yankton-Clay-
Union-
410 AM CDT Fri Aug 2 2019

This Hazardous Weather Outlook is for northeast Nebraska, central
South Dakota, east central South Dakota, south central South Dakota
and southeast South Dakota.

.DAY ONE...Today and tonight.

Scattered showers and thunderstorms will be possible across the area
through this evening. While severe storms are not expected, brief
locally heavy rain is possible, mainly over south central SD and the
James River Valley.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-030915-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-
410 AM CDT Fri Aug 2 2019

This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa and southwest Minnesota.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Aug 2, 10:23 AM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1023 AM CDT FRI AUG 2 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1020 AM     HEAVY RAIN       5 S CHAMBERLAIN         43.73N 99.31W
08/02/2019  M2.50 INCH       BRULE              SD   CO-OP OBSERVER

            2.5 INCHES OF RAIN HAS FALLEN IN THE LAST 30
            MINUTES, WITH RAIN CONTINUING TO FALL.

&&

AT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 10:37 AM CDT	Areal Flood Warning	FSD	Beadle	6 hr
Aug 2, 11:59 AM CDT	Areal Flood Warning	FSD	Beadle, Jerauld, Kingsbury, Miner, Sanborn	3 hr
Aug 2, 2:44 PM CDT	Areal Flood Warning	FSD	Beadle, Jerauld, Kingsbury, Miner, Sanborn	2 hr

Nearby

Areal Flood Warnings in South Dakota, 2019 Every areal flood warning in 2019

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.