Alert archive / South Dakota / Flash Flood Warnings in 2015

Flash Flood Warning 6, NWS Sioux Falls, SD

July 6, 20154 counties in South Dakota

NWS Sioux Falls, SD issued this flash flood warning at Jul 6, 2015, 2:15 AM CDT for 4 counties in South Dakota. It was in force for 3 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: Jul 6, 2015, 2:15 AM CDT (07:15 UTC)
Expired: Jul 6, 2015, 5:15 AM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Lake County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 27 km from the middle of the area, began a volume at 07:14 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, 2:27 AM CDT	FLASH FLOOD	Colton, SD	SIGNIFICANT STREET FLOODING

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, 7.3 hours before the alert went out and 173 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.

618 
WGUS53 KFSD 060715
FFWFSD
SDC079-087-099-101-061015-
/O.NEW.KFSD.FF.W.0006.150706T0715Z-150706T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN MINNEHAHA COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  SOUTHERN MOODY COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  SOUTHEASTERN LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  EASTERN MCCOOK COUNTY IN SOUTHEASTERN SOUTH DAKOTA...

* UNTIL 515 AM CDT
    
* AT 214 AM CDT...DOPPLER RADAR INDICATED A LINE OF 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...
  LAKE VERMILLION STATE RECREATION AREA...DELL RAPIDS...HARTFORD...
  COLTON...CANISTOTA...COLMAN...HUMBOLDT...MONTROSE...EGAN...TRENT
  AND CHESTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 4400 9647 4383 9648 4376 9677 4361 9697
      4351 9731 4382 9734 4400 9689

$$

JM

2 follow-up statements

308 
WGUS73 KFSD 060853
FFSFSD

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

SDC079-087-099-101-061015-
/O.CON.KFSD.FF.W.0006.000000T0000Z-150706T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MINNEHAHA SD-MOODY SD-LAKE SD-MCCOOK SD-
353 AM CDT MON JUL 6 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 AM CDT FOR
NORTHERN MINNEHAHA...SOUTHERN MOODY...SOUTHEASTERN LAKE AND EASTERN
MCCOOK COUNTIES...

AT 353 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE ALREADY
FALLEN. FLASH FLOODING MAY BE ONGOING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
LAKE VERMILLION STATE RECREATION AREA...DELL RAPIDS...HARTFORD...
COLTON...CANISTOTA...COLMAN...HUMBOLDT...MONTROSE...EGAN...TRENT AND
CHESTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 4400 9647 4383 9648 4376 9677 4361 9697
      4351 9731 4382 9734 4400 9689

$$

JM

473 
WGUS73 KFSD 060947
FFSFSD

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

SDC079-087-099-101-060957-
/O.CAN.KFSD.FF.W.0006.000000T0000Z-150706T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MINNEHAHA SD-MOODY SD-LAKE SD-MCCOOK SD-
447 AM CDT MON JUL 6 2015

...THE FLASH FLOOD WARNING FOR NORTHERN MINNEHAHA...SOUTHERN MOODY...
SOUTHEASTERN LAKE AND EASTERN MCCOOK COUNTIES IS CANCELLED...

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

LAT...LON 4400 9647 4383 9648 4376 9677 4361 9697
      4351 9731 4382 9734 4400 9689

$$

JM

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, 12:18 AM CDT	Flash Flood Warning	FSD	Aurora, Davison, Hanson, Hutchinson, McCook	3 hr
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, 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.