Alert archive / South Dakota / Flash Flood Warnings in 2016

Flash Flood Warning 18, NWS Sioux Falls, SD

June 30, 2016Union County, South Dakota; Dixon County, Nebraska

NWS Sioux Falls, SD issued this flash flood warning at Jun 30, 2016, 12:50 AM CDT for Union County, South Dakota; Dixon County, Nebraska. 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 outline as issued.

The facts

Issued
Jun 30, 2016, 12:50 AM CDT (05:50 UTC)
Expired
Jun 30, 2016, 3:45 AM CDT
In force
3 hr
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Flood severity
None

Counties Dixon County, NE, Union County, SD

The radar

The Sioux Falls radar (KFSD), 98 km from the middle of the area, began a volume at 05:50 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 00:00Z, 5.8 hours before the alert went out and 156 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 00:00Z on 2016-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2339 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2016-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.193958Sfc1 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
2339 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1166 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
178 m²/s²
Significant tornado parameter
1.2
Supercell composite
10.0

Open this sounding in Storm Lab

The text

As transmitted.

715 
WGUS53 KFSD 300550
FFWFSD
NEC051-SDC127-300845-
/O.NEW.KFSD.FF.W.0018.160630T0550Z-160630T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1250 AM CDT THU JUN 30 2016

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN DIXON COUNTY IN NORTHEASTERN NEBRASKA...
  SOUTHWESTERN UNION COUNTY IN SOUTHEASTERN SOUTH DAKOTA...

* UNTIL 345 AM CDT

* AT 1250 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE
  ALREADY FALLEN IN THE PAST 30 MINUTES. FLASH FLOODING IS EXPECTED
  TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ELK POINT AND PONCA STATE PARK. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 4256 9654 4262 9678 4282 9681 4283 9681
      4283 9674

$$

WEISSER
2 follow-up statements
515 
WGUS73 KFSD 300711
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
211 AM CDT THU JUN 30 2016

NEC051-SDC127-300845-
/O.CON.KFSD.FF.W.0018.000000T0000Z-160630T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DIXON NE-UNION SD-
211 AM CDT THU JUN 30 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 AM CDT FOR
NORTHEASTERN DIXON AND SOUTHWESTERN UNION COUNTIES...

AT 210 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE ALREADY
FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ELK POINT...INCLUDING INTERSTATE 29 BETWEEN EXITS 18 AND 26. 

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 4256 9654 4262 9678 4282 9681 4283 9681
      4283 9674

$$

WEISSER
145 
WGUS73 KFSD 300844
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
344 AM CDT THU JUN 30 2016

NEC051-SDC127-300851-
/O.EXP.KFSD.FF.W.0018.000000T0000Z-160630T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DIXON NE-UNION SD-
344 AM CDT THU JUN 30 2016

...THE FLASH FLOOD WARNING FOR NORTHEASTERN DIXON AND SOUTHWESTERN
UNION COUNTIES WILL EXPIRE AT 345 AM CDT...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT, HOWEVER ADDITIONAL THUNDERSTORM ACTIVITY COULD BRING
ANADDITIONAL HALF INCH OF RAINFALL TO THE AREA. PLEASE CONTINUE TO
HEED ANY REMAINING ROAD CLOSURES AND PROCEED WITH CAUTION WHEN
ENCOUNTERING WATER ON ROADWAYS.

LAT...LON 4256 9654 4262 9678 4282 9681 4283 9681
      4283 9674

$$

WEISSER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 9:17 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory58 min

Nearby

Flash Flood Warnings in South Dakota, 2016Flash Flood Warnings in Nebraska, 2016Every flash flood warning in 2016

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.