Flash Flood in South Dakota, April 7, 2006

Name: Flash Flood in South Dakota, April 7, 2006
Start: 2006-04-07T00:00
End: 2006-04-07T04:45
Location: South Dakota

April 7, 2006 · NWS FSD · 1 event in 1 county or zone

1 flash flood, as filed by the National Weather Service.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before the first event at Apr 6, 8:35 PM CST, 3 hours 25 minutes earlier.

Area forecast discussion, Apr 6, 8:35 PM CST, 3 hours 25 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
935 PM CDT THU APR 6 2006

.DISCUSSION...
DEALING WITH SVR WX EVENT WHICH IS EXPECTED TO WANE SHORTLY AS
INSTBLTY DOES THE SAME. INDICATIONS ARE MORE SURGES OF LIFT WILL
CONT TO COME UP INTO ERN FCST AREA WITH AXIS OF RICH MOISTR TO FEED
ON AS SYS TRANSLATES EWD AND LOBES SWING UP INTO AREA. WE WILL WIND
UP THEN WITH HVY RAIN AND FLOODING THREAT AS WE HAVE BEEN GOING FOR.
CURNT FLOOD WATCH LOOKS GOOD WITH FIRST SURGE RAINING ON LWR MO RVR
VALLEY...AND WDSPRD POTENTLY HVY RAIN SPRDG NWD INTO NWRN IA AS TIME
PASSES TNGT WITH THIS HVY RAIN PATTRN BCMG ESTABLISHD INTO ERY FRI
MRNG. BTWN WET GROUND AND HI RVRS...AN INCH OR TWO OF WDSPRD RAIN
CAN CAUSE SIGNFCNT LCL FLOODING PRBLMS...AND SEND RVRS AND STREAMS
GOING UP AGAIN. CURNT IDEA OF HVY RAIN POTNTL GETTING UP CLOSE TO
MN/IA BDR LOOKS RIGHT ON WITH DRIER AIR FEEDIN IN FROM N CUTTING
DOWN POTENTL RPDLY TO THE N FROM THERE. FAR SERN SD PART OF WATCH
LOOKS GOOD AS WELL WITH HVY RAIN POTENTL NOT AS FAR N.

WIND ADVY LOOKS GOOD AS WELL WITH GRADNT FIRST TIGHTENG FROM THE
NW...THEN STG PRES RISES SETTING IN LATE TNGT AND FRI MRNG AS SYS
PULLS OUT AND HI PRES STARTS TO NOSE IN. ALL OF FCST AREA WILL CONT
TO HAVE THIS ADVY WITH POTENTIAL TO NOON ERN PART OF FCST AREA. THIS
DOESNT LOOK LIKE A MARGINAL CASE...THO DONT THINK ERYR 56KT GUSTS
WAY UP AT MBG AN INDICATION OF A NEED TO UPGRADE TO WARNG. THAT
SEEMS TO BE PARTIALLY A RESULT OF LCL EFFECTS.

DESPITE QUICK DROPOFF OF HVY RAIN POTENTL N OF I90...RAINFALL SHUD
STILL SPREAD...OR RESPREAD...NWD TO NRN PART OF FCST ARAE SO WILL
KEEP THE POPS UP THERE TNGT.

.PREV DISCUSSION...
SIGNIFICANT SEVERE WEATHER OUTBREAK UNFOLDING ACROSS THE WESTERN
PLAINS THIS AFTERNOON AS A LOW PRESSURE SYSTEM RAPIDLY DEEPENS OVER
EASTERN NEBRASKA. SHOWERS AND THUNDERSTORMS ASSOCIATED WITH ELEVATED
FRONTAL BOUNDARY MOVING VERY SLOWLY CREATING AREAS OF SIGNIFICANT
RAINFALL JUST TO THE NORTH OF THE CWA. FURTHER SOUTH...THUNDERSTORMS
BEGINNING TO DEVELOP IN NORTHEASTERN KANSAS ASSOCIATED WITH A SHORT
WAVE LIFTING NORTHEAST. EXPECT THUNDERSTORMS TO CONTINUE TO DEVELOP
ACROSS EASTERN NEBRASKA LATE THIS AFTERNOON...AND MOVE INTO THE
FORECAST AREA THIS EVENING. WITH SURFACE WARM FRONT EXTENDING FROM
YANKTON TO ORANGE CITY TO NORTH OF STORM LAKE...EXPECT THE THREAT FOR
TORNADOES SOUTH OF HIGHWAY 18...THOUGH THE AMOUNT OF DRY AIR ON THE
KOMA SOUNDING IS CONCERNING. FURTHER NORTH...EXPECT THE THREAT FOR
HAIL THROUGH LATE THIS EVENING. POTENTIAL FOR HEAVY RAIN ALSO STILL
LOOKS GOOD ACROSS THE SOUTHERN CWA NEAR THE BOUNDARY LATER TONIGHT...
WHERE RIVERS ARE ALREADY RUNNING NEAR BANKFUL OR ABOVE. WILL CONTINUE
WITH EXISTING FLOOD WATCH FOR THIS PERIOD...BUT EXTEND INTO EARLY
FRIDAY MORNING AS IT LOOKS AS THOUGH RAIN WILL LINGER PAST SUNRISE.

NORTHEAST WINDS WILL REALLY START CRANKING THIS EVENING AND WILL
ISSUE A WIND ADVISORY FOR THE WESTERN PORTIONS OF THE CWA BEGINNING
AT 03Z...AND THE REMAINDER OF THE CWA AT 06Z. BEST PRESSURE RISES
MOVE OUT OF THE CWA DURING THE MORNING HOURS...AND WILL END ADVISORY
FROM WEST TO EAST BETWEEN 15-18Z.

GET INTO A QUIET PERIOD AGAIN AFTER RAIN MOVES SOUTH OF THE AREA
DURING THE MORNING. SHOULD GET A GOOD PUSH OF DRY AIR FROM THE NORTH
TO CLEAR SKIES NORTH TO SOUTH THROUGH THE LATE MORNING/AFTERNOON...
WITH MOSTLY CLEAR SKIES CONTINUING THROUGH FRIDAY NIGHT AND MUCH OF
SATURDAY. NAM/GFS BOTH SHOWING A WEAK WAVE LIFTING INTO THE UPPER
LEVEL RIDGE SATURDAY NIGHT/SUNDAY. AT THIS TIME...APPEARS THERE IS
QUITE A BIT OF DRY AIR IN PLACE AHEAD OF THE WAVE...AND BEST DYNAMICS
WITH THE WAVE SLIDE NORTH OF THE AREA...SO WILL LEAVE OUR CWA DRY FOR
NOW.

GOOD WARMING AGAIN LATE IN THE WEEKEND/EARLY NEXT WEEK...WITH HIGHS
IN THE 60S TO LOWER 70S AGAIN A PRETTY GOOD BET SUNDAY AND MONDAY.
GFS AND OTHER LONG RANGE MODELS STILL SHOWING A WAVE PUSHING INTO THE
AREA EARLY-MIDWEEK...ALTHOUGH STILL SOME TIMING DIFFERENCES AMONG THE
MODELS LEADING TO SOME UNCERTAINTY. ECMWF IS SLOWEST...12-24 HOURS
BEHIND THE GFS...WITH UKMET AND CANADIAN BETWEEN THE TWO. WILL STICK
WITH GOING TIMING OF MONDAY NIGHT THROUGH TUESDAY NIGHT FOR NEXT
CHANCE OF THUNDERSTORMS...BUT BEST CHANCE AT THIS TIME APPEARS TO BE
TUESDAY INTO TUESDAY EVENING.

&&

.AVIATION...
SHOWERS AND THUNDERSTORMS WILL AFFECT ALL TAF SITES THIS EVENING
INTO THE OVERNIGHT AS A LOW PRESSURE SYSTEM DEEPENS OVER EASTERN
NEBRASKA. AS THIS OCCURS..STRONG NORTHEASTERLY WINDS WILL DEVELOP
ACROSS THE AREA...WITH SURFACE GUSTS APPROACHING 45MPH FROM 09-15Z
FRIDAY MORNING.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
IA...WIND ADVISORY FROM 1 AM TO 1 PM CDT FRIDAY FOR IAZ001-IAZ002-
     IAZ003-IAZ012-IAZ013-IAZ014-IAZ020-IAZ021-IAZ022-IAZ031-
     IAZ032.
     FLOOD WATCH FROM 7 PM CDT THIS EVENING THROUGH FRIDAY MORNING
     FOR IAZ002-IAZ003-IAZ012-IAZ013-IAZ014-IAZ020-IAZ021-IAZ022-
     IAZ031-IAZ032.
MN...WIND ADVISORY FROM 1 AM TO 1 PM CDT FRIDAY FOR MNZ071-MNZ072-
     MNZ080-MNZ081-MNZ089-MNZ090-MNZ097-MNZ098.
NE...WIND ADVISORY FROM 1 AM TO 1 PM CDT FRIDAY FOR NEZ013-NEZ014.
     FLOOD WATCH FROM 7 PM CDT THIS EVENING THROUGH FRIDAY MORNING
     FOR NEZ013-NEZ014.
SD...WIND ADVISORY FROM 1 AM TO 1 PM CDT FRIDAY FOR SDZ040-SDZ055-
     SDZ056-SDZ061-SDZ062-SDZ065-SDZ066-SDZ067-SDZ068-SDZ069-
     SDZ070-SDZ071.
     WIND ADVISORY FROM 10 PM THIS EVENING TO 10 AM CDT FRIDAY FOR
     SDZ038-SDZ039-SDZ050-SDZ052-SDZ053-SDZ054-SDZ057-SDZ058-
     SDZ059-SDZ060-SDZ063-SDZ064.
     FLOOD WATCH FROM 7 PM CDT THIS EVENING THROUGH FRIDAY MORNING
     FOR SDZ069-SDZ070-SDZ071.

&&

WILLIAMS

Hazardous weather outlook, Apr 6, 4:39 PM CST, 7 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
539 PM CDT THU APR 06 2006

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-071200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
539 PM CDT THU APR 06 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
STORMS OVER NORTHEAST NEBRASKA WILL MOVE NORTHEAST INTO
NORTHEASTERN NEBRASKA...SOUTHEASTERN SOUTH DAKOTA...AND
NORTHWESTERN IOWA. THESE STORMS WILL MAINLY PRODUCE HAIL TO THE
SIZE OF HALF DOLLARS...THOUGH AN ISOLATED TORNADO WILL BE
POSSIBLE MAINLY SOUTH OF HIGHWAY 18 THROUGH 9 PM. AREAS TO THE
NORTH AND WEST OF HERE WILL SEE SOME POTENTIAL FOR FOR HAIL TO
THE SIZE OF NICKELS DURING THIS TIME.

FLOODING...
MINOR FLOODING WILL CONTINUE ALONG SOME RIVERS AND STREAMS FROM
SOUTHEAST SOUTH DAKOTA...INTO NORTHWEST IOWA AND SOUTHWEST
MINNESOTA.

THUNDERSTORMS WILL DEVELOP LATE THIS AFTERNOON AND EVENING ACROSS
THE AREA...BRINGING HEAVY RAIN TO MANY LOCATIONS. THE HEAVIEST
RAIN...POSSIBLY REACHING TWO AND A HALF INCHES...SHOULD OCCUR
ALONG AND SOUTH OF A YANKTON TO SPENCER IOWA LINE. THIS MAY
EXACERBATE ANY ONGOING FLOODING OR POSSIBLY CREATE NEW FLOODING
PROBLEMS.

WIND AND FOG...
NORTHEAST WINDS WILL INCREASE LATE THIS AFTERNOON AND
EVENING...WITH SUSTAINED WINDS AROUND 30 MPH POSSIBLE AND GUSTS
AS HIGH AS 40 MPH POSSIBLE. THE STRONGEST WINDS SHOULD OCCUR FROM
ABOUT MIDNIGHT THROUGH NOON ON FRIDAY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

STRONG NORTH TO NORTHEAST WINDS WILL DECREASE THROUGHOUT THE DAY
ON FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.
SPOTTER ACTIVATION WILL BE POSSIBLE AFTER
SPOTTER ACTIVATION WILL BE LIKELY AFTER

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

In the hours before

Local storm report, Apr 6, 7:37 PM CST, 4 hours 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
837 PM CDT THU APR 06 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0828 PM     HAIL             SIOUX CITY              42.50N 96.39W
04/06/2006  E0.88 INCH       WOODBURY           IA   TRAINED SPOTTER

            MARBLE TO NICKEL SIZE HAIL.

0831 PM     HAIL             NEWCASTLE               42.65N 96.87W
04/06/2006  E1.00 INCH       DIXON              NE   TRAINED SPOTTER

            3/4 TO 1 INCH HAIL, ENOUGH TO COVER THE GROUND.

&&

BUSS

Local storm report, Apr 6, 7:50 PM CST, 4 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
850 PM CDT THU APR 06 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0842 PM     HAIL             2 S GAYVILLE            42.86N 97.17W
04/06/2006  E0.75 INCH       YANKTON            SD   TRAINED SPOTTER

0845 PM     HAIL             2 NE UTICA              43.00N 97.47W
04/06/2006  E1.00 INCH       YANKTON            SD   TRAINED SPOTTER

0845 PM     HAIL             4 W VOLIN               42.96N 97.26W
04/06/2006  E1.00 INCH       YANKTON            SD   TRAINED SPOTTER

&&

BUSS

Local storm report, Apr 6, 8:12 PM CST, 3 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
912 PM CDT THU APR 06 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0840 PM     HAIL             MECKLING                42.84N 97.07W
04/06/2006  E0.88 INCH       CLAY               SD   TRAINED SPOTTER

0845 PM     HAIL             ELK POINT               42.68N 96.68W
04/06/2006  E0.75 INCH       UNION              SD   TRAINED SPOTTER

&&

BUSS

Local storm report, Apr 6, 8:43 PM CST, 3 hours 17 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Apr 6, 9:38 PM CST, 2 hours 22 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1038 PM CDT THU APR 06 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0828 PM     HAIL             SIOUX CITY              42.50N 96.39W
04/06/2006  E0.88 INCH       WOODBURY           IA   TRAINED SPOTTER

            MARBLE TO NICKEL SIZE HAIL.

0831 PM     HAIL             NEWCASTLE               42.65N 96.87W
04/06/2006  E1.00 INCH       DIXON              NE   TRAINED SPOTTER

            3/4 TO 1 INCH HAIL, ENOUGH TO COVER THE GROUND.

0840 PM     HAIL             MECKLING                42.84N 97.07W
04/06/2006  E0.88 INCH       CLAY               SD   TRAINED SPOTTER

0842 PM     HAIL             2 S GAYVILLE            42.86N 97.17W
04/06/2006  E0.75 INCH       YANKTON            SD   TRAINED SPOTTER

0845 PM     HAIL             2 NE UTICA              43.00N 97.47W
04/06/2006  E1.00 INCH       YANKTON            SD   TRAINED SPOTTER

0845 PM     HAIL             4 W VOLIN               42.96N 97.26W
04/06/2006  E1.00 INCH       YANKTON            SD   TRAINED SPOTTER

0845 PM     HAIL             ELK POINT               42.68N 96.68W
04/06/2006  E0.75 INCH       UNION              SD   TRAINED SPOTTER

0932 PM     HAIL             3 SE LENNOX             43.32N 96.85W
04/06/2006  E0.75 INCH       LINCOLN            SD   PUBLIC

0943 PM     HAIL             CANTON                  43.30N 96.58W
04/06/2006  E0.88 INCH       LINCOLN            SD   LAW ENFORCEMENT

&&

BUSS

The radar

The Sioux Falls radar (KFSD), 17 km away, was scanning. The volume nearest the first event began at 05:59 UTC.

Open the radar archive at this moment

Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Minnehaha

When: April 7, 12:00 AM CST to 4:45 AM CST
Where: Minnehaha County, South Portion
Reported by: TRAINED SPOTTER
Coordinates: 43.717, -96.833

Heavy rainfall of 3 to 5 inches caused flooding of low areas and roads, with a few roads being washed out. Some basements of homes and other buildings were flooded. Flooded areas included a golf course in Brandon which was temporarily closed. The heaviest rainfall was reported at Renner, just north of Sioux Falls, where 4.9 inches of rain was reliably measured, with an unofficial report of 6.4 inches in another gauge. Considerable urban flooding was reported in Sioux Falls.

What these are

Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in South Dakota in 2006 Every state in 2006 This day in weather history Warnings in South Dakota, April 2006

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 5502022.