Flash Flood Warning 13, NWS Sioux Falls, SD

Issued

Jun 20, 2011, 9:39 PM CDT (02:39 UTC)

Expired

Jun 21, 2011, 12:30 AM CDT

In force

3 hr

Issued by

NWS Sioux Falls, SD

Area

Storm-based polygon

Flood severity

None

Counties Lyon County, IA, Sioux County, IA, Lincoln County, SD, Minnehaha County, SD, Turner County, SD

The Sioux Falls radar (KFSD), 5 km from the middle of the area, began a volume at 02:39 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.

886 
WGUS53 KFSD 210239
FFWFSD
IAC119-167-SDC083-099-125-210530-
/O.NEW.KFSD.FF.W.0013.110621T0239Z-110621T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA
  MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHEASTERN TURNER COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHWESTERN SIOUX COUNTY IN NORTHWEST IOWA
  WESTERN LYON COUNTY IN NORTHWEST IOWA

* UNTIL 1230 AM CDT

* AT 934 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING ACROSS THE WARNED 
  AREA. VERY HEAVY RAINFALL AMOUNTS OF 1 TO 2 INCHES IN LESS THAN AN 
  HOUR HAVE BEEN REPORTED WITH THIS LINE OF STORMS. 
  FURTHERMORE...THE LINE OF STORMS AFFECTING THE BIG SIOUX RIVER 
  VALLEY IS ELONGATED IN A NORTH TO SOUTH DIRECTION ALONG I 29...AND 
  ARE MOVING NORTHWARD. THIS MEANS THE RAINFALL COULD LAST OVER AN 
  HOUR IN SOME LOCATIONS...PRODUCING 2 TO 4 INCHES OF RAIN. URBAN 
  FLOODING IN LOW LYING AND POOR DRAINAGE AREAS WILL BE A SERIOUS 
  THREAT.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CANTON...SIOUX FALLS...BALTIC...BRANDON...CHANCELLOR...COLTON...
  CROOKS...FAIRVIEW...HARRISBURG...HARTFORD...LENNOX...NEWTON HILLS
  STATE PARK...ROWENA...TEA...WALL LAKE AND WORTHING.

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 4380 9662 4317 9640 4316 9695 4380 9711

$$

MJF

132 
WGUS73 KFSD 210402
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1102 PM CDT MON JUN 20 2011

IAC119-167-SDC083-099-125-210530-
/O.CON.KFSD.FF.W.0013.000000T0000Z-110621T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SIOUX IA-LYON IA-MINNEHAHA SD-LINCOLN SD-TURNER SD-
1102 PM CDT MON JUN 20 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHEASTERN TURNER...
LINCOLN...MINNEHAHA...WESTERN LYON AND NORTHWESTERN SIOUX COUNTIES
UNTIL 1230 AM CDT...

AT 1053 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH MODERATE RAINFALL ACROSS THE WARNED AREA. 
RAINFALL RATES ARE BEGINNING TO DECREASE ACROSS THE WARNED AREA AS 
THE HEAVIEST RAINFALL MOVES NORTHWARD. HOWEVER RAINFALL WILL 
CONTINUE FOR THE NEXT TWO HOURS...WHICH WILL LIMIT THE ABILITY OF 
EXCESS WATER RUNOFF TO DRAIN AWAY FROM LOW LYING AND POOR DRAINAGE 
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 4380 9662 4317 9640 4316 9695 4380 9711

$$
MJF

880 
WGUS73 KFSD 210529
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1229 AM CDT TUE JUN 21 2011

IAC119-167-SDC083-099-125-210539-
/O.EXP.KFSD.FF.W.0013.000000T0000Z-110621T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SIOUX IA-LYON IA-MINNEHAHA SD-LINCOLN SD-TURNER SD-
1229 AM CDT TUE JUN 21 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHEASTERN
TURNER...LINCOLN...MINNEHAHA...WESTERN LYON AND NORTHWESTERN SIOUX
COUNTIES WILL BE ALLOWED TO EXPIRE AT 1230 AM CDT...

EXCESS RUNOFF IN URBAN AREAS FROM HEAVY RAIN HAS ENDED OVER THE 
WARNED AREA. SMALL STREAMS AND CREEKS IN THE WARNED AREA WILL SLOWLY 
RECEDE OVER THE NEXT FEW HOURS. LARGER RIVERS SUCH AS THE SKUNK AND 
SPLIT ROCK CREEK ARE WELL BELOW FLOOD STAGE. REMEMBER NIGHT TIME 
CONDITIONS INVOLVING EXCESS WATER ARE DANGEROUS. IF TRAVELING IN 
RURAL AREAS ON SECONDARY ROADS...BE AWARE THAT SOME LOW LYING AREAS 
COULD BE WASHED OUT. 

LAT...LON 4380 9662 4317 9640 4316 9695 4380 9711

$$

MJF

Flash Flood Warnings in South Dakota, 2011Flash Flood Warnings in Iowa, 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.