Alert archive / South Dakota / Flash Flood Warnings in 2016

Flash Flood Warning 2, NWS Sioux Falls, SD

May 22, 20164 counties in South Dakota

NWS Sioux Falls, SD issued this flash flood warning at May 22, 2016, 10:45 PM CDT for 4 counties in South Dakota. It was in force for 6 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 22, 2016, 10:45 PM CDT (03:45 UTC)
Expired: May 23, 2016, 4:45 AM CDT
In force: 6 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

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

The radar

The North Platte radar (KLNX), 190 km from the middle of the area, began a volume at 03:48 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.

What was reported inside it

Time	Report	Where	Remark
May 23, 1:00 AM CDT	FLASH FLOOD	Platte, SD	STREET FLOODING WITHIN THE CITY OF PLATTE. WATER OVER 1 FOOT DEEP ON SOME STREETS. REPORTS AND IMAGES OF FLOODING RELAYED VIA TWITTER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.8 hours before the alert went out and 187 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: 1223 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1730 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

878 
WGUS53 KFSD 230345
FFWFSD
SDC003-015-023-053-230945-
/O.NEW.KFSD.FF.W.0002.160523T0345Z-160523T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1045 PM CDT SUN MAY 22 2016

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN AURORA COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...
  SOUTHWESTERN GREGORY COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...
  NORTHWESTERN CHARLES MIX COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...
  SOUTHEASTERN BRULE COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...

* UNTIL 445 AM CDT MONDAY

* AT 1043 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO 2 TO 3 INCHES OF RAIN
  HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.
  THUNDERSTORMS ARE EXPECTED TO CONTINUE FOR AN ADDITIONAL 1 TO 2
  HOURS AND TOTAL RAINFALL MAY REACH 3 TO 5 INCHES. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GREGORY...PLATTE...BURKE AND DALLAS. CREEKS THAT MAY EXPERIENCE
  FLOODING INCLUDE...WHETSTONE CREEK...PLATTE CREEK...AND CASTALIA
  CREEK. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4323 9953 4331 9918 4358 9892 4358 9865
      4334 9881 4319 9904 4300 9953

$$

DUX

2 follow-up statements

895 
WGUS73 KFSD 230601
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
101 AM CDT MON MAY 23 2016

SDC003-015-023-053-230945-
/O.CON.KFSD.FF.W.0002.000000T0000Z-160523T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
AURORA SD-GREGORY SD-CHARLES MIX SD-BRULE SD-
101 AM CDT MON MAY 23 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM CDT MONDAY
FOR SOUTHWESTERN AURORA...SOUTHWESTERN GREGORY...NORTHWESTERN CHARLES
MIX AND SOUTHEASTERN BRULE COUNTIES...

AT 1259 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS HAD PRODUCED
HEAVY RAINFALL ACROSS THE WARNING AREA. UP TO TWO TO AS MANY AS
THREE INCHES OF RAIN HAVE ALREADY FALLEN. FLASH FLOODING WILL
CONTINUE AS WATER SLOWLY RECEDES.  THUNDERSTORMS HAVE MOVED EAST OF
THE WARNING AREA...NO ADDITIONAL RAINFALL IS EXPECTED. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
GREGORY...PLATTE...BURKE AND DALLAS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4323 9953 4331 9918 4358 9892 4358 9865
      4334 9881 4319 9904 4300 9953

$$

DUX

038 
WGUS73 KFSD 230943
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
443 AM CDT MON MAY 23 2016

SDC003-015-023-053-230952-
/O.EXP.KFSD.FF.W.0002.000000T0000Z-160523T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
AURORA SD-GREGORY SD-CHARLES MIX SD-BRULE SD-
443 AM CDT MON MAY 23 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN AURORA...SOUTHWESTERN
GREGORY...NORTHWESTERN CHARLES MIX AND SOUTHEASTERN BRULE COUNTIES
WILL EXPIRE AT 445 AM CDT...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO USE CAUTION IF YOU ENCOUNTER AREAS OF
PONDED WATER.

LAT...LON 4323 9953 4331 9918 4358 9892 4358 9865
      4334 9881 4319 9904 4300 9953

$$

JH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 8:34 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	41 min
May 22, 9:13 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	47 min
May 22, 9:51 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Douglas	39 min
May 22, 10:06 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	39 min
May 22, 10:23 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Davison, Douglas, Jerauld, Sanborn	52 min
May 23, 5:22 PM CDT	Severe Thunderstorm Warning	FSD	Union	23 min
May 23, 5:58 PM CDT	Flash Flood Warning	FSD	Union	4 hr

Nearby

Flash Flood Warnings in South Dakota, 2016 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.