Flash Flood Warning 12, NWS Sioux Falls, SD

Issued

Jun 20, 2011, 9:18 PM CDT (02:18 UTC)

Expired

Jun 20, 2011, 11:30 PM CDT

In force

2 hr

Issued by

NWS Sioux Falls, SD

Area

Storm-based polygon

Flood severity

None

Counties Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Dakota County, NE, Lincoln County, SD, Union County, SD

The Sioux Falls radar (KFSD), 97 km from the middle of the area, began a volume at 02:21 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.

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

352 
WGUS53 KFSD 210218
FFWFSD
IAC149-167-193-NEC043-SDC083-127-210430-
/O.NEW.KFSD.FF.W.0012.110621T0218Z-110621T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
918 PM CDT MON JUN 20 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DAKOTA COUNTY IN NORTHEAST NEBRASKA
  NORTHWESTERN WOODBURY COUNTY IN WEST CENTRAL IOWA
  SOUTHERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA
  SOUTHWESTERN SIOUX COUNTY IN NORTHWEST IOWA
  UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
  WESTERN PLYMOUTH COUNTY IN NORTHWEST IOWA

* UNTIL 1130 PM CDT

* AT 911 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
  RAINFALL ESTIMATES OF 2 TO 3 INCHES WERE COMMON IN WESTERN DAKOTA 
  COUNTY. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BERESFORD...HAWARDEN...SIOUX CITY...AKRON...ALCESTER...CRAIG...
  DAKOTA CITY...ELK POINT...HINTON...HOMER...HUBBARD...HUDSON...
  IRETON...JACKSON...JEFFERSON...MERRILL...NORTH SIOUX CITY...
  SALIX...SERGEANT BLUFF...SOUTH SIOUX CITY AND STONE STATE PARK.

A LINE OF THUNDERSTORMS WILL BE MOVING NORTHWARD ACROSS THE LOWER   
BIG SIOUX VALLEY AREA PRODUCING WIDESPREAD 1 TO 3 INCH RAINFALL   
AMOUNTS OVER THE NEXT 1 TO 2 HOURS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4253 9668 4253 9664 4255 9664 4259 9670
      4263 9671 4265 9668 4267 9672 4302 9681
      4308 9680 4309 9683 4317 9685 4316 9631
      4230 9617 4231 9663

$$

MJF

149 
WGUS73 KFSD 210355
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1055 PM CDT MON JUN 20 2011

IAC149-167-193-NEC043-SDC083-127-210430-
/O.CON.KFSD.FF.W.0012.000000T0000Z-110621T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SIOUX IA-PLYMOUTH IA-WOODBURY IA-DAKOTA NE-LINCOLN SD-UNION SD-
1055 PM CDT MON JUN 20 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR UNION...SOUTHERN
LINCOLN...DAKOTA...NORTHWESTERN WOODBURY...WESTERN PLYMOUTH AND
SOUTHWESTERN SIOUX COUNTIES UNTIL 1130 PM CDT...

AT 1048 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH MODERATE RAINFALL CONTINUING ACROSS THE WARNED 
AREA. RAINFALL RATES ARE DECREASING...AND SHOWER AND THUNDERSTORM 
ACTIVITY SHOULD BECOME LESS WIDESPREAD AFTER MIDNIGHT. RAINFALL 
RATES EARLIER THIS EVENING IN THE WARNED AREA WERE JUST OVER 2 
INCHES PER HOUR.

RUNOFF FROM THE EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR. IT IS LIKELY THERE IS STILL RESIDUAL FLOODING...ESPECIALLY IN 
LOW LYING AND POOR DRAINAGE AREAS...BOTH IN RURAL AND URBAN AREAS.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE MINOR FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4253 9668 4253 9664 4255 9664 4259 9670
      4263 9671 4265 9668 4267 9672 4302 9681
      4308 9680 4309 9683 4317 9685 4316 9631
      4230 9617 4231 9663

$$

MJF

339 
WGUS73 KFSD 210425
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1125 PM CDT MON JUN 20 2011

IAC149-167-193-NEC043-SDC083-127-210440-
/O.EXP.KFSD.FF.W.0012.000000T0000Z-110621T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SIOUX IA-PLYMOUTH IA-WOODBURY IA-DAKOTA NE-LINCOLN SD-UNION SD-
1125 PM CDT MON JUN 20 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR UNION...SOUTHERN
LINCOLN...DAKOTA...NORTHWESTERN WOODBURY...WESTERN PLYMOUTH AND
SOUTHWESTERN SIOUX COUNTIES WILL BE ALLOWED TO EXPIRE AT 1130 PM
CDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 4253 9668 4253 9664 4255 9664 4259 9670
      4263 9671 4265 9668 4267 9672 4302 9681
      4308 9680 4309 9683 4317 9685 4316 9631
      4230 9617 4231 9663

$$

MJF

Flash Flood Warnings in Iowa, 2011Flash Flood Warnings in South Dakota, 2011Flash Flood Warnings in Nebraska, 2011Every flash flood warning in 2011

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.