Alert archive / South Dakota / Flash Flood Warnings in 2016

Flash Flood Warning 30, NWS Sioux Falls, SD

September 15, 20169 counties in South Dakota; Dixon County, Nebraska; Lyon County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Sep 15, 2016, 2:11 PM CDT for 9 counties in South Dakota; Dixon County, Nebraska; Lyon County, Iowa. It was in force for 3 hr. 11 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: Sep 15, 2016, 2:11 PM CDT (19:11 UTC)
Expired: Sep 15, 2016, 5:15 PM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Lyon County, IA, Dixon County, NE, Bon Homme County, SD, Clay County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 87 km from the middle of the area, began a volume at 19:10 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
Sep 15, 2:35 PM CDT	FLASH FLOOD	4 N Tea, SD	FLOODING AT PETTIGREW ELEMENTARY SCHOOL AND PARK.
Sep 15, 2:42 PM CDT	FLASH FLOOD	4 Se Sioux Falls, SD	57TH STREET FLOODED BETWEEN SOUTHEASTERN AVE AND SYCAMORE AVE.
Sep 15, 2:45 PM CDT	HEAVY RAIN 6.05	4 N Harrisburg, SD	69TH STREET AND SOUTHEASTERN AVENUE.
Sep 15, 2:55 PM CDT	FLASH FLOOD	1 Sw Sioux Falls, SD	FLASH FLOODING AT 26TH STREET AND WESTERN AVE.
Sep 15, 2:57 PM CDT	FLASH FLOOD	1 Ssw Yankton, SD	FLASH FLOODING IN PEOPLE'S YARDS.
Sep 15, 3:15 PM CDT	HEAVY RAIN 3.62	4 Ene Tea, SD	.
Sep 15, 3:15 PM CDT	HEAVY RAIN 5.06	3 Sse Sioux Falls, SD	.
Sep 15, 3:45 PM CDT	HEAVY RAIN 4.55	3 Se Sioux Falls, SD	.
Sep 15, 4:00 PM CDT	HEAVY RAIN 3.63	4 Sw Brandon, SD	.
Sep 15, 4:00 PM CDT	HEAVY RAIN 4.39	4 Nnw Harrisburg, SD	.
Sep 15, 4:10 PM CDT	HEAVY RAIN 5.02	4 Sse Sioux Falls, SD	NEAR 69TH AND TOMAR ROAD.

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

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.2 hours before the alert went out and 190 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: 696 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 648 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

077 
WGUS53 KFSD 151911
FFWFSD
IAC119-NEC051-SDC009-027-067-083-087-099-125-127-135-152215-
/O.NEW.KFSD.FF.W.0030.160915T1911Z-160915T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
211 PM CDT THU SEP 15 2016

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN LYON COUNTY IN NORTHWESTERN IOWA...
  NORTHWESTERN DIXON COUNTY IN NORTHEASTERN NEBRASKA...
  SOUTHERN MINNEHAHA COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  SOUTHEASTERN HUTCHINSON COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  NORTHWESTERN UNION COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  YANKTON COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  CLAY COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  SOUTHEASTERN MCCOOK COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  LINCOLN COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  SOUTHEASTERN BON HOMME COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  TURNER COUNTY IN SOUTHEASTERN SOUTH DAKOTA...

* UNTIL 515 PM CDT

* AT 209 PM CDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED
  HEAVY RAIN FALLING ACROSS THE WARNED AREA. UP TO FIVE INCHES OF
  RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS ALREADY OCCURRING.

ADDITIONAL RAINFALL AMOUNTS OF UP TO 2 INCHES ARE POSSIBLE IN THE
WARNED AREA. THIS EXTENDS THE EARLIER FLASH FLOOD WARNING THAT WAS
IN EFFECT UNTIL 230 PM CDT FOR THIS AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4274 9702 4276 9702 4277 9705 4277 9713
      4280 9716 4281 9721 4285 9722 4285 9729
      4287 9731 4286 9736 4287 9741 4285 9744
      4286 9750 4285 9755 4286 9760 4284 9766
      4285 9776 4371 9719 4372 9646 4271 9681

$$

GILLISPIE

1 follow-up statement

666 
WGUS73 KFSD 152210
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
510 PM CDT THU SEP 15 2016

IAC119-NEC051-SDC009-027-067-083-087-099-125-127-135-152219-
/O.EXP.KFSD.FF.W.0030.000000T0000Z-160915T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON IA-DIXON NE-MINNEHAHA SD-HUTCHINSON SD-UNION SD-YANKTON SD-
CLAY SD-MCCOOK SD-LINCOLN SD-BON HOMME SD-TURNER SD-
510 PM CDT THU SEP 15 2016

...THE FLASH FLOOD WARNING FOR NORTHWESTERN LYON...NORTHWESTERN
DIXON...SOUTHERN MINNEHAHA...SOUTHEASTERN HUTCHINSON...NORTHWESTERN
UNION...YANKTON...CLAY...SOUTHEASTERN MCCOOK...LINCOLN...SOUTHEASTERN
BON HOMME AND TURNER COUNTIES WILL EXPIRE AT 515 PM CDT...

THE HEAVY RAIN HAS ENDED. FLOOD WATERS HAVE RECEDED. FLOODING IS NO
LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ANY
REMAINING ROAD CLOSURES.

LAT...LON 4274 9702 4276 9702 4277 9705 4277 9713
      4280 9716 4281 9721 4285 9722 4285 9729
      4287 9731 4286 9736 4287 9741 4285 9744
      4286 9750 4285 9755 4286 9760 4284 9766
      4285 9776 4371 9719 4372 9646 4271 9681

$$

GILLISPIE

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 11:34 AM CDT	Flash Flood Warning	FSD	Bon Homme, Clay, Hutchinson, Lincoln, McCook, Minnehaha and 3 more	3 hr
Sep 15, 1:40 PM CDT	Flash Flood Warning	FSD	Lincoln, Minnehaha	3 hr
Sep 15, 4:37 PM CDT	Flash Flood Warning	FSD	Lincoln	3 hr
Sep 15, 4:07 PM CDT	Flash Flood Warning	FSD	Clay, Dickinson, O'Brien, Osceola, Sioux	3 hr
Sep 15, 5:53 PM CDT	Flash Flood Warning	FSD	Buena Vista, Cherokee, Clay, O'Brien	3 hr

Nearby

Flash Flood Warnings in South Dakota, 2016 Flash Flood Warnings in Nebraska, 2016 Flash Flood Warnings in Iowa, 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.