Alert archive / South Dakota / Flash Flood Warnings in 2015

Flash Flood Warning 5, NWS Sioux Falls, SD

July 6, 20155 counties in South Dakota

NWS Sioux Falls, SD issued this flash flood warning at Jul 6, 2015, 12:18 AM CDT for 5 counties in South Dakota. It was in force for 3 hr. 2 reports 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: Jul 6, 2015, 12:18 AM CDT (05:18 UTC)
Expired: Jul 6, 2015, 3:15 AM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Aurora County, SD, Davison County, SD, Hanson County, SD, Hutchinson County, SD, McCook County, SD

The radar

The Sioux Falls radar (KFSD), 90 km from the middle of the area, began a volume at 05:18 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.

What was reported inside it

Time	Report	Where	Remark
Jul 6, 2:00 AM CDT	FLASH FLOOD	Mitchell, SD	SIGNIFICANT STREET FLOODING IN TOWN.
Jul 6, 2:30 AM CDT	HEAVY RAIN 4	Salem, SD	MINIMAL FLOODDING, MAINLY OVER TOWN

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, 5.3 hours before the alert went out and 147 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: 1725 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1201 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

497 
WGUS53 KFSD 060518
FFWFSD
SDC003-035-061-067-087-060815-
/O.NEW.KFSD.FF.W.0005.150706T0518Z-150706T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1218 AM CDT MON JUL 6 2015

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DAVISON COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  NORTH CENTRAL HUTCHINSON COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  WESTERN MCCOOK COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  SOUTHEASTERN AURORA COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...
  HANSON COUNTY IN SOUTHEASTERN SOUTH DAKOTA...

* UNTIL 315 AM CDT
    
* AT 1217 AM CDT...TRAINED WEATHER SPOTTERS REPORTED A THUNDERSTORM
  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...
  MITCHELL...PLANKINTON...SALEM...ALEXANDRIA...BRIDGEWATER...MOUNT
  VERNON...EMERY...STICKNEY...SPENCER IN MCCOOK COUNTY...FULTON...
  LOOMIS AND FARMER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4381 9735 4352 9732 4342 9778 4357 9783
      4357 9865 4379 9865

$$

HANKO

2 follow-up statements

517 
WGUS73 KFSD 060700
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
200 AM CDT MON JUL 6 2015

SDC003-035-061-067-087-060815-
/O.CON.KFSD.FF.W.0005.000000T0000Z-150706T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAVISON SD-HUTCHINSON SD-MCCOOK SD-AURORA SD-HANSON SD-
200 AM CDT MON JUL 6 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM CDT FOR
DAVISON...NORTH CENTRAL HUTCHINSON...WESTERN MCCOOK...SOUTHEASTERN
AURORA AND HANSON COUNTIES...

AT 159 AM CDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING IN 
MITCHELL. UP TO THREE INCHES OF RAIN HAVE ALREADY FALLEN. FLASH 
FLOODING IS ALREADY OCCURRING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
MITCHELL...PLANKINTON...SALEM...ALEXANDRIA...BRIDGEWATER...MOUNT
VERNON...EMERY...STICKNEY...SPENCER IN MCCOOK COUNTY...FULTON...
LOOMIS AND FARMER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4381 9735 4352 9732 4342 9778 4357 9783
      4357 9865 4379 9865

$$

HANKO

009 
WGUS73 KFSD 060812
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
312 AM CDT MON JUL 6 2015

SDC003-035-061-067-087-060821-
/O.EXP.KFSD.FF.W.0005.000000T0000Z-150706T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAVISON SD-HUTCHINSON SD-MCCOOK SD-AURORA SD-HANSON SD-
312 AM CDT MON JUL 6 2015

...THE FLASH FLOOD WARNING FOR DAVISON...NORTH CENTRAL HUTCHINSON...
WESTERN MCCOOK...SOUTHEASTERN AURORA AND HANSON COUNTIES WILL EXPIRE
AT 315 AM CDT...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.

LAT...LON 4381 9735 4352 9732 4342 9778 4357 9783
      4357 9865 4379 9865

$$

HANKO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 9:02 PM CDT	Flash Flood Watch	FSD	Aurora, Bon Homme, Brookings, Brule, Charles Mix, Clay and 16 more	8 hr
Jul 5, 9:12 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	48 min
Jul 5, 10:00 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	45 min
Jul 5, 11:23 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison	37 min
Jul 5, 11:53 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson, McCook	37 min
Jul 6, 12:20 AM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	25 min
Jul 6, 12:23 AM CDT	Tornado Warning	FSD	McCook, Turner	24 min
Jul 6, 12:54 AM CDT	Tornado Warning	FSD	Minnehaha	23 min
Jul 6, 1:11 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Union	49 min
Jul 6, 2:15 AM CDT	Flash Flood Warning	FSD	Lake, McCook, Minnehaha, Moody	3 hr
Jul 6, 9:06 AM CDT	River Flood Warning	FSD	Moody	7 days
Jul 6, 9:06 AM CDT	River Flood Warning	FSD	Minnehaha	58 hr
Jul 6, 1:21 PM CDT	River Flood Warning	FSD	Minnehaha	7 days

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.