Alert archive / South Dakota / Flash Flood Warnings in 2015

Flash Flood Warning 4, NWS Aberdeen, SD

July 2, 2015Corson County, South Dakota

NWS Aberdeen, SD issued this flash flood warning at Jul 2, 2015, 4:16 AM MDT for Corson 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 2, 2015, 4:16 AM MDT (10:16 UTC)
Expired: Jul 2, 2015, 10:15 AM MDT
In force: 6 hr
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Flood severity: None

County Corson County, SD

The radar

The Bismarck radar (KBIS), 123 km from the middle of the area, began a volume at 10:20 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 10.3 hours before the alert went out and 124 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: 348 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1340 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 2, 2:07 AM MDT, 2 hours 9 minutes earlier.

Area forecast discussion, Jul 2, 2:07 AM MDT, 2 hours 9 minutes before

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Hazardous weather outlook, Jul 2, 2:15 AM MDT, 2 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
315 AM CDT THU JUL 2 2015

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-030815-
TRAVERSE-BIG STONE-CORSON-CAMPBELL-MCPHERSON-BROWN-MARSHALL-
ROBERTS-WALWORTH-EDMUNDS-DAY-DEWEY-POTTER-FAULK-SPINK-CLARK-
CODINGTON-GRANT-HAMLIN-DEUEL-STANLEY-SULLY-HUGHES-HYDE-HAND-JONES-
LYMAN-BUFFALO-
315 AM CDT THU JUL 2 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
MINNESOTA...CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND
NORTHEAST SOUTH DAKOTA.

.DAY ONE...TODAY AND TONIGHT

A FEW STRONG STORMS ARE POSSIBLE THIS MORNING AND AGAIN THIS
AFTERNOON...WITH AN ISOLATED SEVERE STORM. THE RISK IS MAINLY FOR
HAIL AND STRONG WINDS. AGAIN...WIDESPREAD SEVERE WEATHER IS NOT
EXPECTED.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

ADDITIONAL OPPORTUNITIES FOR STORMS EXIST SATURDAY AFTERNOON AS
WELL AS SUNDAY AFTERNOON AND OVERNIGHT. THE RISK FOR SEVERE
WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

CONNELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 4:15 AM MDT	Flash Flood Warning	ABR	Hyde, Potter, Sully	6 hr
Jul 2, 4:28 AM MDT	Severe Thunderstorm Warning	ABR	Buffalo, Lyman	62 min
Jul 2, 5:51 AM MDT	Severe Thunderstorm Warning	ABR	Lyman	24 min
Jul 2, 10:13 AM MDT	Special Weather Statement	ABR	Edmunds, Faulk	2 hr

Nearby

Flash Flood Warnings in South Dakota, 2015 Every 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.