River Flood Warning 14, NWS Sioux Falls, SD

386 
WGUS83 KFSD 262108
FLSFSD
FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
408 PM CDT SUN MAY 26 2013

...THE FLOOD WARNING IS CANCELLED FOR THE FOLLOWING RIVERS IN SOUTH 
DAKOTA...IOWA...

  BIG SIOUX RIVER AT WESTERN AVE 
  FLOYD RIVER AT LE MARS 

...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS IN SOUTH 
DAKOTA...IOWA...
  JAMES RIVER AT HURON
  JAMES RIVER NEAR FORESTBURG
  JAMES RIVER AT MITCHELL
  VERMILLION RIVER NEAR DAVIS
  VERMILLION RIVER NEAR WAKONDA
  BIG SIOUX RIVER AT HAWARDEN
  BIG SIOUX RIVER AT AKRON
  FLOYD RIVER AT ALTON 
  LITTLE SIOUX RIVER AT SPENCER 
  LITTLE SIOUX RIVER AT LINN GROVE 
   
.THE FOLLOWING RIVER FORECASTS INCLUDE FORECAST PRECIPITATION THROUGH
TONIGHT. ANY ADDITIONAL FUTURE RAINS COULD AFFECT THE CREST 
FORECASTS. 
 
OVERNIGHT THUNDERSTORMS DUMPED HEAVY RAINFALL FROM 2 TO 6 INCHES OVER A
WIDESPREAD AREA OF SOUTHEAST SOUTH DAKOTA AND NORTHWEST IOWA. HEAVIEST 
RAINFALL OCCURRED IN AN AXIS FROM NEAR SALEM SOUTH DAKOTA...THROUGH
SIOUX FALLS...TO ORANGE CITY AND SPENCER IOWA. RUNOFF FROM THESE RAINS...
ALONG WITH POTENTIAL HEAVY RAINS AGAIN TONIGHT IN SOME AREAS...WILL BRING
MINOR TO MODERATE FLOODING TO MANY OF THE MAINSTEM RIVERS OVER THE NEXT
SEVERAL DAYS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...DO NOT DRIVE CARS THROUGH FLOODED AREAS.  THE WATER 
DEPTH AND ROAD CONDITION MAY BE UNSAFE.

ADDITIONAL INFORMATION IS AVAILABLE AT 
 
HTTP://WWW.WATER.WEATHER.GOV/AHPS2/INDEX.PHP?WFO=FSD

STAY TUNED FOR FURTHER UPDATES BY LISTENING TO NOAA WEATHER RADIO...
OR YOUR LOCAL RADIO AND TV STATIONS.

THE NEXT SCHEDULED STATEMENT WILL BE ISSUED TOMORROW MORNING. 

&&

SDC125-280108-
/O.CON.KFSD.FL.W.0007.130527T0824Z-130530T0430Z/
/DVSS2.1.ER.130527T0824Z.130527T1800Z.130529T0430Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE VERMILLION RIVER NEAR DAVIS.
* FROM LATE TONIGHT TO WEDNESDAY EVENING.
* FLOOD STAGE IS 11.0 FEET.
* AT STAGES NEAR 13.0 FEET...MODERATE FLOODING OF AGRICULTURAL LAND 
  BEGINS. 

$$

SDC027-280108-
/O.CON.KFSD.FL.W.0008.130529T0349Z-130601T0300Z/
/WKAS2.2.ER.130529T0349Z.130530T0000Z.130531T0300Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE VERMILLION RIVER NEAR WAKONDA.
* FROM TUESDAY EVENING TO FRIDAY EVENING.
* AT 07AM SUNDAY THE STAGE WAS 3.8 (ESTIMATED) FEET.
* FLOOD STAGE IS 14.0 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE BY 11 PM TUESDAY AND CREST NEAR 
  15.5 FEET BY WEDNESDAY MAY 29. THE RIVER WILL FALL BELOW FLOOD 
  STAGE BY THURSDAY MAY 30.
* AT STAGES NEAR 15.5 FEET...WATER REACHES THE BOTTOM OF THE BRIDGE 
  ON HIGHWAY 19 NEAR LODI...AND 306TH STREET NEAR HUB CITY WILL FLOOD 
  ALONG WITH SEVERAL OTHER COUNTY ROADS. 

$$

SDC083-099-262138-
/O.CAN.KFSD.FL.W.0005.000000T0000Z-130526T2108Z/
/WAVS2.1.ER.130526T0635Z.130526T0900Z.130526T1151Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING IS CANCELLED FOR
  THE BIG SIOUX RIVER AT WESTERN AVE.
* AT 03PM SUNDAY THE STAGE WAS 6.3 FEET.
* FLOOD STAGE IS 10.0 FEET.

$$

IAC167-SDC083-127-280107-
/O.CON.KFSD.FL.W.0009.130527T0630Z-130531T1100Z/
/HAWI4.1.ER.130527T0630Z.130528T1200Z.130530T1100Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE BIG SIOUX RIVER AT HAWARDEN.
* FROM LATE TONIGHT TO FRIDAY MORNING.
* AT 07AM SUNDAY THE STAGE WAS 7.1 (ESTIMATED) FEET.
* FLOOD STAGE IS 15.0 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE BY 1 AM MONDAY AND CREST NEAR 
  18.1 FEET BY TUESDAY MAY 28. THE RIVER WILL FALL BELOW FLOOD STAGE 
  BY THURSDAY MAY 30.
* AT STAGES NEAR 19.0 FEET...SOUTH DAKOTA HIGHWAY 46 BEGINS TO FLOOD.

$$

IAC149-SDC127-280107-
/O.CON.KFSD.FL.W.0010.130527T1905Z-130531T2254Z/
/AKRI4.2.ER.130527T1905Z.130529T0000Z.130530T2254Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE BIG SIOUX RIVER AT AKRON.
* FROM MONDAY AFTERNOON TO FRIDAY AFTERNOON.
* AT 03PM SUNDAY THE STAGE WAS 7.8 FEET.
* FLOOD STAGE IS 16.0 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE BY 2 PM MONDAY AND CREST NEAR 
  19.1 FEET BY TUESDAY MAY 28. THE RIVER WILL FALL BELOW FLOOD STAGE 
  BY THURSDAY MAY 30.
* AT STAGES NEAR 19.5 FEET...SEVERAL FARM HOUSES ARE FLOODED. 

$$

SDC005-280107-
/O.CON.KFSD.FL.W.0011.130602T1200Z-000000T0000Z/
/HURS2.1.ER.130602T1200Z.130602T1200Z.000000T0000Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE JAMES RIVER AT HURON.
* FROM SUNDAY JUNE 02 UNTIL FURTHER NOTICE.
* AT 03PM SUNDAY THE STAGE WAS 10.2 FEET.
* FLOOD STAGE IS 11.0 FEET.
* FORECAST...THE RIVER IS EXPECTED TO RISE TO NEAR FLOOD STAGE 7 AM 
  SUNDAY.
* AT STAGES NEAR 11.0 FEET...SIGNIFICANT AMOUNTS OF RURAL AREAS WILL 
  EXPERIENCE FLOODING. 

$$

SDC111-280107-
/O.CON.KFSD.FL.W.0012.130528T2200Z-000000T0000Z/
/FORS2.1.ER.130528T2200Z.130531T0000Z.000000T0000Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE JAMES RIVER NEAR FORESTBURG.
* FROM TUESDAY AFTERNOON UNTIL FURTHER NOTICE.
* AT 03PM SUNDAY THE STAGE WAS 7.8 FEET.
* FLOOD STAGE IS 12.0 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE BY 5 PM TUESDAY AND CREST NEAR 
  13.9 FEET BY THURSDAY MAY 30.
* AT STAGES NEAR 14.0 FEET...MANY OF THE COUNTY AND TOWNSHIP ROADS 
  ALONG THE RIVER ARE UNDER WATER. 

$$

SDC035-061-280107-
/O.CON.KFSD.FL.W.0013.130531T0300Z-000000T0000Z/
/JRMS2.1.ER.130531T0300Z.130602T0600Z.000000T0000Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE JAMES RIVER AT MITCHELL.
* FROM THURSDAY EVENING UNTIL FURTHER NOTICE.
* AT 02PM SUNDAY THE STAGE WAS 13.4 FEET.
* FLOOD STAGE IS 17.0 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE BY 10 PM THURSDAY AND CONTINUE TO
  RISE TO NEAR 18.7 FEET BY 1 AM SUNDAY. ADDITIONAL RISES ARE 
  POSSIBLE THEREAFTER.
* AT STAGES NEAR 20.0 FEET...THE HIGHER BANKS OVERFLOW. 

$$

IAC167-280107-
/O.EXT.KFSD.FL.W.0006.000000T0000Z-130529T0120Z/
/ALTI4.1.ER.130526T0846Z.130526T1030Z.130528T0120Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE FLOYD RIVER AT ALTON.
* UNTIL TUESDAY EVENING.
* AT 03PM SUNDAY THE STAGE WAS 11.0 FEET.
* FLOOD STAGE IS 12.0 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE BY 5 PM MONDAY AND CREST NEAR 
  12.2 FEET BY MONDAY MAY 27. THE RIVER WILL FALL BELOW FLOOD STAGE 
  BY MONDAY MAY 27.
* AT STAGES NEAR 12.0 FEET...FLOODING BEGINS TO AFFECT THE LOWER 
  LYING AGRICULTURAL LANDS ALONG THE RIVER. 

$$

IAC149-262138-
/O.CAN.KFSD.FL.W.0014.000000T0000Z-130527T2125Z/
/LMRI4.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING IS CANCELLED FOR
  THE FLOYD RIVER AT LE MARS.
* AT 01PM SUNDAY THE STAGE WAS 17.0 (ESTIMATED) FEET.
* FLOOD STAGE IS 20.0 FEET.
* FORECAST...THE RIVER WILL CREST BELOW FLOOD STAGE AT 19.2 FEET 1 PM
  MONDAY.
* AT STAGES NEAR 20.0 FEET...SOME AGRICULTURAL LAND BEGINS TO 
  FLOOD...AND THE LOW LYING AREAS IN THE WESTERN EDGES OF LE MARS BEGIN
  TO FLOOD. 

$$

IAC041-280107-
/O.EXT.KFSD.FL.W.0015.130527T2230Z-000000T0000Z/
/SPWI4.1.ER.130527T2230Z.130529T0600Z.000000T0000Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE LITTLE SIOUX RIVER AT SPENCER.
* FROM MONDAY AFTERNOON UNTIL FURTHER NOTICE.
* FLOOD STAGE IS 10.0 FEET.

$$

IAC021-041-280107-
/O.EXT.KFSD.FL.W.0016.130528T1200Z-000000T0000Z/
/LNNI4.1.ER.130528T1200Z.130531T1800Z.000000T0000Z.NO/
408 PM CDT SUN MAY 26 2013

THE FLOOD WARNING CONTINUES FOR
  THE LITTLE SIOUX RIVER AT LINN GROVE.
* FROM TUESDAY MORNING UNTIL FURTHER NOTICE.
* AT 03PM SUNDAY THE STAGE WAS 16.3 FEET.
* FLOOD STAGE IS 18.0 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE BY 7 AM TUESDAY AND CONTINUE TO 
  RISE TO NEAR 19.0 FEET BY 1 PM FRIDAY. ADDITIONAL RISES ARE 
  POSSIBLE THEREAFTER.
* AT STAGES NEAR 18.5 FEET...THE CITY PARK IN SIOUX RAPIDS IS 
  FLOODED. 

$$

&& 
LOCATION FLOOD  LATEST OBSERVED  MAXIMUM FORECAST  RECENT OBSERVED
         STAGE  STAGE  TIME      STAGE   TIME      CREST  TIME

VERMILLION RIVER
DVSS2    11.0                     12.9  MON 1 PM 
WKAS2    14.0   E3.80 SUN 7 AM    15.5  WED 7 PM 

BIG SIOUX RIVER
WAVS2    10.0    6.26 SUN 3 PM                     11.2  SUN MAY 26
HAWI4    15.0   E7.10 SUN 7 AM    18.1  TUE 7 AM
AKRI4    16.0    7.79 SUN 3 PM    19.1  TUE 7 PM

JAMES RIVER
HURS2    11.0   10.20 SUN 3 PM    11.0  SUN 7 AM 
FORS2    12.0    7.78 SUN 3 PM    13.9  THU 7 PM 
JRMS2    17.0   13.39 SUN 3 PM    18.7  SUN 1 AM 

FLOYD RIVER
ALTI4    12.0   11.03 SUN 3 PM    12.2  MON 7 PM    15.4  SUN MAY 26
LMRI4    20.0   17.00 SUN 2 PM    19.2  MON 1 PM

LITTLE SIOUX RIVER
SPWI4    10.0                     12.1  WED 1 AM
LNNI4    18.0   16.29 SUN 3 PM    19.0  FRI 1 PM

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
725 AM CDT SUN MAY 26 2013

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 545 AM CDT SUN MAY 26 2013

BUSY MORNING CONTINUES ACROSS THE CWA. CONVECTION FIRED LAST EVENING
AS THE LOW LEVEL JET PICKED UP AND ADVECTED RICH THETAE AIR OVER A
LOW LEVEL FRONTAL BOUNDARY. THE BOUNDARY REMAINED NEARLY STATIONARY
MUCH OF THE NIGHT ALLOWING FOR CONTINUED REGENERATION OF HEAVY
SHOWERS AND THUNDERSTORMS. COOL OUTFLOW FINALLY ALLOWED THIS TO PUSH
SOUTH INTO PORTIONS OF NORTHWEST IOWA. RAINFALL TOTALS IN THE BAND
OF HEAVY RAIN HAVE GENERALLY BEEN FROM 2 TO 4 INCHES...WITH ISOLATED
6 INCH AMOUNTS. AT THIS POINT THE WAA RAIN SEEMS TO BE IN A
WEAKENING TREND...ALTHOUGH STILL SOME HEAVY RAIN OVER PORTIONS OF
NORTHWEST IOWA. THINK THIS TREND SHOULD CONTINUE...AS DAYLIGHT AND
THE USUAL DIURNAL WEAKENING TREND TAKES OVER. RADAR SHOWS TWO
UPSTREAM THUNDERSTORM COMPLEXES AS WELL. NO MODEL IS HANDLING THE
SITUATION WELL. BUT THOUGHT CONTINUES TO BE THAT THESE THUNDERSTORM
COMPLEXES SHOULD CONTINUE A WEAKENING TREND AS THEY APPROACH OUR
WORKED OVER ATMOSPHERE. THE FIRST COMPLEX CURRENTLY APPROACHING
HURON APPEARS TO  BE MOVING MORE WITH THE MEAN CLOUD LAYER
WIND...WHICH SHOULD KEEP MOST OF IT MAINLY NORTH OF INTERSTATE 90.
THIS SHOULD STAY SUB SEVERE...AS IT MOVES INTO A LOWER MUCAPE
ATMOSPHERE. THE SECOND AREA HAS ORGANIZED ALONG ITS OUTFLOW AND IS
MOVING MORE WITH THE CORFIDI VECTORS. THAT WOULD SUGGEST THIS AREA
MAY IMPACT AREAS ALONG AND WEST OF THE JAMES RIVER AROUND MID
MORNING...IF IT SURVIVES THE TRIP...AS THE LINE IS NOT TOO
IMPRESSIVE AT THIS POINT...AND DONT SEE MUCH OF A REASON WHY IT
WOULD STRENGTHEN.

SO WITH ALL THAT SAID...THE MAIN TAKE AWAY IS THAT WE SHOULD
PROBABLY GET A LULL IN THE ACTION FOR A PERIOD THIS AFTERNOON.
TEMPERATURES ARE TRICKY AND AGAIN DEPENDENT ON CLOUD COVER. FOR NOW
LOWERED HIGHS SOME IN THE EAST WHERE STRATUS WILL PROBABLY DOMINATE
THE DAY...AND RAISED THEM SOME IN OUR WEST WHERE AFTERNOON SUN IS
MORE LIKELY. CONVECTION WILL LIKELY GET GOING AGAIN THIS EVENING
ALONG THE LOW LEVEL BOUNDARY...BUT THOUGHT IS THIS PROBABLY WAITS
UNTIL AFTER 0Z...AND THAT WILL BE DISCUSSED BELOW. /

AGAIN LOOKING FOR RESURGENCE IN CONVECTION DURING NOCTURNAL PERIOD
ACROSS THE AREA. GIVEN THE UPSTREAM PRECIPITABLE WATER OF 1.3 TO
1.5 INCHES...LIKELY BOUNDARY LOCATION TO THE SOUTH AFTER RAINFALL
REINFORCEMENT...LOW LEVEL JET...AND A WEAK WAVE INDICATED IN NEARLY
ALL THE DETERMINISTIC GUIDANCE...CERTAINLY LITTLE QUESTION OF A
HEIGHTENED FLASH FLOODING RISK. THIS WITHOUT CONSIDERING THE
RAINFALL FROM THE CURRENT NIGHT...WHICH MAKES THE SETUP ALL THE
MORE DIRE. SHOULD ALSO BE GOOD FOR EFFICIENT WARMER RAIN PROCESSES
WITH 12-13KFT WARM CLOUD DEPTH. HIGH RESOLUTION MODELS HITTING
AREAS MOSTLY ALONG AND SOUTH OF INTERSTATE 90 THE TOUGHEST
OVERNIGHT...AND WOULD TEND TO AGREE WITH THAT ASSESSMENT. EARLY
EVENING WILL FIND ANOTHER SETUP OF SLIGHTLY ELEVATED 1000-1500
J/KG WITH DEEP SHEAR A BIT WEAK FOR SUPERCELLULAR DEVELOPMENT
OVERALL...BUT LIKELY TO FAVOR DECENT MULTICELLULAR ORGANIZATION.
INITIAL STORMS WILL DEVELOP LIKELY THROUGH THE MISSOURI RIVER
CORRIDOR WILL BE CAPABLE OF SEVERE STORMS WITH HAIL AND DAMAGING
WIND. LIKELY TO AGAIN BE LOOKING AT A SETUP FOR SOME TRAINING OF
CELLS ALONG THE BOUNDARY...BUT LOW LEVEL JET SHOULD BE A BIT MORE
WILLING TO VEER WITH WAVE WORKING ACROSS THE AREA THROUGH THE
NIGHT. HAVE ISSUED A FLASH FLOOD WATCH FOR ALL OF NORTHWEST
IOWA...AND SOUTHEAST SOUTH DAKOTA WITH NORTHERN AREAS DEFINED BY
LOCATION IMPACTED BY HEAVIER OVERNIGHT RAINFALL...AS WELL AS
EXTREME NORTHEAST NEBRASKA.

.LONG TERM...(MONDAY THROUGH SATURDAY)
ISSUED AT 545 AM CDT SUN MAY 26 2013

RAINFALL WILL LINGER INTO MONDAY MORNING IN EASTERN LOCATIONS AS
DIURNAL CYCLE...EXITING WAVE AND EVENTUAL WEAKENING OF LOW LEVEL
JET TAKE TOLL ON PRECIP...LEAVING MUCH OF THE AREA WILL HAVE A
DOWNTIME CONVECTIVELY MONDAY. LIKELY TO HAVE A FAIR AMOUNT OF
DEBRIS AROUND IN TERMS OF CLOUDINESS...WITH OVERALL NET LOW LEVEL
MOISTURE INCREASING. HEADING INTO MONDAY NIGHT...MAY GET SOMEWHAT
OF A LESSER OVERALL COVERAGE OF PRECIP...BUT WILL MAINLY MODERATE
TO HIGH CHANCE POPS...MAINLY WEST AND SOUTH IN THE AREA...AS MORE
FAVORED WESTERN AREAS THERMODYNAMICALLY LEAK THUNDERSTORMS INTO
THE WEST...AND THE MORE LOW LEVEL JET DRIVEN ACTION FIRES OFF TO
THE SOUTH AND EAST. HARD TO COMPLETELY RULE OUT ANYWHERE THOUGH AT
THIS TIME.

REALLY LOOK AT POTENTIAL FOR TUESDAY AFTERNOON WITH LIKELIHOOD OF
DEVELOPING SOME GREATER INSTABILITY ACROSS THE AREA...AND
PROGRESSION OF A WEAK SURFACE BOUNDARY INTO THE CWA. INSTABILITY
WILL BE UP A BIT FROM PREVIOUS DAYS...PERHAPS REACHING 2KJ/KG...
AND SLIGHT INCREASE IN MID LEVEL WINDS PROVIDING A DEEPER SHEAR
PROFILE. LIKELIHOOD OF CONVECTION SHOULD INCREASE NOTABLY OVERNIGHT
AS PRESSURE FALLS IN WESTERN PLAINS DRIVE MORE SOLID INCREASE AND
BACKING TO EARLIER WEAK LOW LEVEL JET.

PERHAPS THE BEST CHANCE FOR SEVERE WEATHER WILL BE LATER WEDNESDAY
THROUGH THURSDAY AS DEEP WESTERN TROUGH MOVES EASTWARD...WRAPPING
A FAIRLY GOOD WAVE NORTHWARD THROUGH THE PLAINS...AND STRENGTHENS
THE SHEAR BY PUSHING A DECENT MID LEVEL WIND MAX ACROSS THE AREA.
GIVEN THE ONGOING WEATHER...NOT MUCH TIME TO DIAGNOSE THE LAST FEW
DAYS OF THE FORECAST. UPPER LEVEL LOW WILL WIND UP ACROSS THE
NORTHERN PLAINS...BUT BEST OF THE INSTABILITY AND SHEAR MAY
ACTUALLY END UP SHIFTING MORE TO THE SOUTH AND EAST BY FRIDAY.

WHILE CURRENT FLASH FLOOD WATCH ENDS MONDAY MORNING...IT IS LIKELY
THAT THERE WILL BE FURTHER HYDROLOGIC CONCERNS THROUGH THE
UPCOMING WEEK.

&&

.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z MONDAY MORNING)
ISSUED AT 725 AM CDT SUN MAY 26 2013

ANOTHER LOW CONFIDENCE TAF FORECAST TODAY. SHOWERS AND STORMS SHOULD
CONTINUE TO BE ON A DOWNWARD TREND THROUGH THIS MORNING...WITH THE AFTERNOON
EXPECTED TO BE DRY. LOW STRATUS IS ANOTHER ISSUE. MOST MODEL GUIDANCE
KEEP IT LOCKED IN THROUGH THE DAY AT FSD AND HON...WITH ONLY KSUX
ABLE TO BREAK THROUGH BY AFTERNOON. THUS WILL LEAN THE TAFS IN THIS
DIRECTION. ANOTHER ROUND OF CONVECTION IS LIKELY TONIGHT. CURRENT
THOUGHT IS IT FIRES NEAR THE LOW LEVEL BOUNDARY AND FORMS INTO
ANOTHER COMPLEX WITH HEAVY RAIN. STILL UNCERTAIN WHERE THIS
FORMS...BUT BEST CHANCE SEEMS TO BE SOUTH OF INTERSTATE 90. STRATUS
SHOULD LINGER THROUGH THE NIGHT...WITH MVFR OR IFR CIGS.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR SDZ061-062-065>071.

MN...NONE.
IA...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR IAZ001>003-012>014-
     020>022-031-032.

NE...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR NEZ013-014.

&&

SHORT TERM...CHAPMAN/CHENARD
LONG TERM...CHAPMAN
AVIATION...CHENARD

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
649 AM CDT SUN MAY 26 2013

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-271200-
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-
649 AM CDT SUN MAY 26 2013

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
AN AREA OF THUNDERSTORM WITH VERY HEAVY RAINFALL WILL CONTINUE
EARLY THIS MORNING ACROSS AREAS SOUTH OF HIGHWAY 3 IN NORTHWEST
IOWA. A FEW STORMS MAY PRODUCE DIME TO NICKEL SIZE HAIL THROUGH 8
AM FROM AROUND SIOUX CITY EASTWARD TO HOLSTEIN AND IDA GROVE.
ANOTHER CLUSTER OF THUNDERSTORMS WILL MOVE SOUTHEAST FROM AROUND
HURON TOWARD SIOUX FALLS AND SOUTHWEST MINNESOTA THROUGH MID TO
LATE MORNING. THESE STORMS ARE NOT EXPECTED TO BE SEVERE.

ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED TO DEVELOP THIS
EVENING WITH INITIATION FROM PARTS OF WESTERN SOUTH DAKOTA TOWARD
THE LOWER MISSOURI VALLEY. THESE STORMS COULD INITIALLY BE SEVERE
WITH POTENTIAL FOR HAIL UP TO PING PONG BALL SIZE AND WIND GUSTS
TO 60 MPH. AS THE NIGHT PROGRESSES...A LARGE COMPLEX OF STORMS IS
AGAIN EXPECTED TO DEVELOP...AFFECTING AREAS MAINLY ALONG AND
SOUTH OF INTERSTATE 90. TRAINING STORMS WILL BE CAPABLE OF
PRODUCING VERY HEAVY RAINFALL... WITH ISOLATED STORM CAPABLE OF
HAIL TO QUARTER SIZE WELL INTO THE NIGHT ALONG THE SOUTHERN EDGE
OF THE BAND.

FLOODING...
SEVERAL SMALL CREEKS AND STREAMS ACROSS NORTHWEST IOWA REMAIN IN
FLOOD EARLY THIS MORNING...AND HEAVY RAINFALL CONTINUES TO
PRODUCE A FLASH FLOOD THREAT SOUTH OF HIGHWAY 3 AND NORTH OF
HIGHWAY 20. FLOODING CONTINUES THIS MORNING ALONG THE BIG SIOUX
RIVER AROUND SIOUX FALLS...AND THE FLOYD RIVER NEAR ALTON.

A FLASH FLOOD WATCH HAS BEEN ISSUED FOR SOUTHEAST SOUTH
DAKOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. THIS IS
PRIMARILY IN RESPONSE TO THE THREAT FOR ADDITIONAL HEAVY RAINFALL
DEVELOPING TONIGHT...WHERE ANOTHER 2 TO 5 INCH RAINFALL WILL BE
POSSIBLE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

ANOTHER ROUND OF THUNDERSTORMS ARE EXPECTED BY MEMORIAL DAY LATE
AFTERNOON AND EVENING...AND AGAIN TUESDAY...EACH WITH THE THREAT
FOR A SEVERE STORM.

THE UNSETTLED PATTERN WILL CONTINUE THROUGH MUCH OF THE UPCOMING
WEEK WITH PERIODIC CHANCES FOR THUNDERSTORMS THROUGH FRIDAY.
SEVERE STORMS WILL REMAIN A POSSIBILITY AROUND THE
AREA...FOCUSING MAINLY DURING LATE DAY AND EVENING HOURS. THE
RISK FOR FLASH FLOODING WILL BE MODERATE TO HIGH...GIVEN THE
POTENTIAL FOR SEVERAL ROUNDS OF HEAVY  RAINFALL. HOWEVER...FOR
EACH OF THE FLOODING AND SEVERE WEATHER THREATS LATER INTO THE
WEEK...IT IS DIFFICULT TO LOCATE WHERE THE GREATEST RISK IS AT
THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 700 PM CDT THROUGH AND
NEAR THE MISSOURI RIVER VALLEY.

&&

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
646 AM CDT SUN MAY 26 2013

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

0644 AM     HEAVY RAIN       W ROCK VALLEY           43.20N 96.31W
05/26/2013  M3.35 INCH       SIOUX              IA   CO-OP OBSERVER

&&

JCHAPMAN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
709 AM CDT SUN MAY 26 2013

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

0630 AM     FLASH FLOOD      AURELIA                 42.71N 95.44W
05/26/2013                   CHEROKEE           IA   LAW ENFORCEMENT

            WATER OVER ROADWAY IN TOWN.

&&

JCHAPMAN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
826 AM CDT SUN MAY 26 2013

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

0815 AM     HAIL             8 W WESSINGTON SPRINGS  44.08N 98.73W
05/26/2013  M1.25 INCH       JERAULD            SD   TRAINED SPOTTER

&&

JCHAPMAN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
900 AM CDT SUN MAY 26 2013

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

0830 AM     HEAVY RAIN       SE AKRON                42.83N 96.56W
05/26/2013  M0.75 INCH       PLYMOUTH           IA   CO-OP OBSERVER

&&

JCHAPMAN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
929 AM CDT SUN MAY 26 2013

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

0510 AM     HEAVY RAIN       N HOSPERS               43.07N 95.90W
05/26/2013  M3.83 INCH       SIOUX              IA   TRAINED SPOTTER

            IN ADDITION TO THE 3.83 INCHES OF RAINFALL, THERE WAS
            FLOODING IN THE FLOYD RIVER BOTTOMS.

0725 AM     HEAVY RAIN       CHEROKEE                42.75N 95.55W
05/26/2013  M2.64 INCH       CHEROKEE           IA   TRAINED SPOTTER

0920 AM     HEAVY RAIN       1 NW SALEM              43.73N 97.40W
05/26/2013  M3.19 INCH       MCCOOK             SD   TRAINED SPOTTER

            IN ADDITION TO THE 3.19 INCHES OF RAINFALL, THERE WAS
            ALSO SOME HAIL OVERNIGHT.

&&

TRM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
932 AM CDT SUN MAY 26 2013

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

0928 AM     HEAVY RAIN       4 WSW SIOUX FALLS       43.53N 96.82W
05/26/2013  M6.60 INCH       MINNEHAHA          SD   NWS EMPLOYEE

            24 HOUR RAINFALL TOTAL

0928 AM     HEAVY RAIN       3 SE SIOUX FALLS        43.52N 96.68W
05/26/2013  M3.70 INCH       MINNEHAHA          SD   PUBLIC

&&