Flash Flood Warning 28, NWS Sioux Falls, SD

000 
WGUS73 KFSD 040323
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1021 PM CDT FRI AUG 3 2007

SDC043-040530-
DOUGLAS SD-
1021 PM CDT FRI AUG 3 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR
EASTERN DOUGLAS COUNTY...

AT 1020 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

RADAR CONTINUES TO INDICATE HEAVY RAINFALL FALLING OVER THE WARNED 
AREA.  RADAR ESTIMATES SUGGEST RAINFALL AMOUNTS OVER THE LAST HOUR 
TOTAL FROM ONE TO TWO INCHES...WITH LOCALIZED AREAS OF TWO TO THREE 
INCHES. 

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

LAT...LON 4328 9840 4327 9812 4350 9812 4349 9841

$$

BT

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
335 PM CDT FRI AUG 3 2007

.DISCUSSION...
COMPLEX FCST IN THE NEAR TERM TONIGHT. ATTM...NMRS SHRA AND TS CONT
TO HOLD TOGETHER IN CENTRAL SD...WITH OTHER ISOLD ACTIVITY BEHIND
AND TO THE SOUTH OF THE MCV WHERE THE AIRMASS HAS DESTABILIZED. NOT
REAL CONCERNED ABOUT SVR WX LATE THIS PM AND EVENING. THE ONLY
SECTION OF THE CWFA THAT IS A BIT UNSTABLE IS OUR SW CORNER...WHERE
ELEVATED MU CAPES JUST EXCEED 1000 J/KG. WIND SHEAR IS EXCELLENT.
HOWEVER WITH THE OBVIOUS STABILITY GOING ON RIGHT NOW WITH THE MCV...
LAPSE RATES HAVE BECOME STABILIZED IN THAT AREA. CANNOT RULE OUT AN
ISOLD SVR CELL IN OUR SWRN CWFA THRU 02Z...BUT ELSEWHERE IT WL BE
TOUGH. FOR TONIGHT...FOLLOWED A BLEND OF THE GFS AND HPC OUTPUT AS
THE NAM AND GEM LOOK TO BE PLACING THE QPF TOO FAR NORTH BASED ON
CURRENT REALITY. THAT BEING SAID...THE NAM AND GFS ARE VERY CLOSE
WITH THEIR RESPECTIVE DYNAMICAL PARAMETERS. BOTH MODELS SHOW
EXTREMELY STRONG H85 WAA IN THE ENTIRE FSD FA TONIGHT...WITH A
STRENGTHENING LOW LEVEL JET. THIS FA IS ALSO IN A SUBTLE RR ENTRANCE
OF A JET STREAK TO THE NE...WITH STRONG MID LVL -DIV Q CENTERED ON I
90. THE NAM PLACED A CONVECTIVE BULLSEYE LATE THIS PM JUST WSW OF
MOBRIDGE SD ALONG A CONVECTIVELY INDUCED INVERTED TROF. THAT IS
INCREASINGLY LOOKING LESS LIKELY. FURTHERMORE... CORFIDI VECTORS
DEFINITELY SHOW A SEWD SLANT...AND THE ENTIRE WAVE BY MIDNIGHT
BEGINS TO ERODE THE S/W RIDGE IN FRONT OF IT...AND TAKE MORE OF A
ESE TURN. THEREFORE AM EXPECTING THE PCPN TO FILL IN BEHIND THE
CURRENT MCV IN CENTRAL SD...AS THE CURRENT ISOLD ACTIVITY BECOMES
ORGANIZED AND FILLS IN TO THE WEST AND SW OF THE FA. THE ACTIVITY
SHOULD TRACK INITIALLY EWD THRU THE WRN FA...THEN TAKE A SEWD TRACK
AS THE OVERNIGHT PROGRESSES INTO THE SE QUAD OF THE FSD FA. AREAS OF
HVY RAIN WL BE PROBABLE AS PWATS ARE WELL ABV NORMAL TONIGHT...AND
WITH REDEVELOPMENT PERSISTENT. COOLED LOWS TONIGHT AS HIGHS TODAY
WERE MODERATED BY THE CLOUDS...AND AM WORRIED ABOUT A LOT OF RAIN
COOLED AIR TONIGHT.

THE ACTIVITY WL SLOWLY EXIT ESE SAT MORNING WITH THE WAVE...WITH
MORE HEAVY RAIN POTENTIAL IN THE IA GRTLKS REGION BEFORE IT GOES.
FCST CONTINUES COMPLEX...DUE TO CONVECTIVE COMPLEX AND ITS WANING
REMANTS. REJECTED NAM SLN AS APPEARS TO OVERDEVELOP PCPN IN WRONG
PLACE OVERNIGHT...AND THEN OVERAMPLIFIES SFC WAVE ON BNDRY WITH
VERY LITTLE INDICATION OF OUTFLOW BNDRY SAT...RESULTING IN
INCREDIBLE INSTABILITY AND SHEAR. IN ACTUALITY...NOT TERRIBLY HIGH
ON SEVERE WEATHER THREAT OVER MUCH OF CWA AS EXPECT A VAST PROBLEM
WITH DESTABILIZING IN WAKE OF OVERNIGHT AND MORNING CONVECTIVE COLD
POOL. WL HAVE TO MONITOR HOW FAR SWRD THE OUTFLOW BNDRY CAN
PUSH...BUT WOULD APPEAR THAT IT WILL WELL CLEAR THE CWA TO THE
SOUTH...LEAVING ELEVATED INSTABILITY THE MAIN THREAT SOURCE. SREF
LOOKS TO KEEP A HIGH PROBABILITY OF MEASURABLE THRU SRN TIER THRU
EVNG...AND LIKE THE GFS CLUSTER OF SLNS ON THAT FRONT. WK PUSH OF
DRIER AIR BEHIND SYSTEM ON SAT NIGHT WITH SFC RIDGE BECOMING
CENTERED OVER AREA. WL HAVE TO WATCH FOR FOG THREAT...AS WL HAVE A
VERY SIGNIFICANT INVERSION. BNDRY WL START TO SAG INTO AREA FROM
NORTH IN RESPONSE TO IMPULSE IN WLY FLOW...BUT WL SLOW HEAING TOWARD
I90 LTR SUN NIGHT AND MON. THIS WL SET UP POTENTIAL FOR A VERY
STRONG THERMAL CONTRAST ON MON...ESPLY IF CLOUDS AND PRECIP CAN
ENHANCE CONTRAST OVR BNDRY. ANOTHER WAVE COMING OUT OF MEAN WRN
TROUGH WL START TO ENHANCE LOW LVL FLOW SUN NIGHT...ON EDGE OF
DEEPER MOISTURE RETURN...EVENTUALLY FAVORING A LOW CHANCE BY AFTN
ACRS NRN CWA. ONE LOCATION TO BE WARY OF BY LATER MON AFTN/EVNG FOR
SVR THREAT WOULD BE THE EMERGING TRIPLE POINT AT WARMFRONT/DRYLINE
INTERSECTION IN SCNTRL SD. IT IS VERY WARM ALFT...BUT MAY BE ABLE TO
HEAT CLOSER TO THE CENTURY MARK AND BREAK STRONGER CAP...ALL THE TIME
ELEVATED CONVECTION CONTINUES ARCING TO THE NE OF THIS AREA.

PATTERN IN THE EXTENDED RANGE IS QUITE INTRIGUING...A CLASSIC
NOCTURNAL RIDGE RIDER PATTERN ON THE SOUTHERN EDGE OF THE WESTERLIES
OVER THE AREA. WOULD NOT BE SURPRISED TO FIND SOME AREAS WITH QUITE
A BIT OF RAIN BY THE END OF NEXT WEEK...AS SETUP IS FOR BNDRY TO NOT
GO TOO FAR SWRD WITH STRONG RIDGING IN SERN US. PERIODIC CONVECTION
LOOKS TO BE A LARGE DRIVING FORCE BEHIND BNDRY LOCATION.  SOME
CONSENSUS ON WAVE MON NIGHT/EARLY TUE...WHICH SHUD INTERACT WITH E/W
FRONTAL BNDRY TO PRODUCE DECENT COVERAGE OF CONVECTION STARTING ACRS
SD CWA ON MON EVENING...COLLAPSING SEWRD THRU NIGHT. WL LINGER WITH
BNDRY ACRS NW IA AND NERN NEBRASKA ON TUE. WHILE VERY HARD TO SAY
EXACTLY WHEN THE THREAT WL DROP OFF COMPLETELY...SEEMS MOST AREAS
LESS LKLY TO SEE PCPN TUE NIGHT INTO WED SOME POTENTIAL ENHANCEMENT
AGAIN WED NIGHT WITH RETURN FLOW ACRS BNDRY...WITH ONLY SUBTROPICAL
FLOW TO MAINTAIN AT LEAST A THREAT OF SOME ELEVATED CONVECTION THRU
ERN PORTIONS OF CWA AFTER BNDRY WASHES OUT/REFOCUSES NORTHWARD.  WL
PLAY TEMPERATURES CLOSE TO THE VEST TODAY...AND KEEP A TYPICAL
TROPICAL RANGE IN TMPS.

&&

.AVIATION...
SHWRS AFCTG W CWA THIS AFTN CREATING MVFR AT HON...BUT EXPC THAT OTR
TAF SITES IN E CWA WL RMN VFR THRU AFTN. FSD AND SUX TAFS MAY NEED
TO BE UPDATED TO MOV PCPN IN ERYR TNGT WITH AREA OF SHWRS CONTIG TO
PROGRESS EWD. EXPC IFR CONDS WITH TSTMS BGNG IN HON AND MOVG E TO
FSD BY MIDN...THEN TO SUX IN THE ERY MRNG.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
IA...NONE.
NE...NONE.

&&

MJF/CHAPMAN/LAFLIN

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1248 PM CDT FRI AUG 03 2007

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-041200-
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-
1248 PM CDT FRI AUG 03 2007

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
THUNDERSTORM ACTIVITY WILL HOVER ALONG AND WEST OF A WAGNER SOUTH
DAKOTA TO HURON SOUTH DAKOTA LINE THIS AFTERNOON...WITH A SLIGHT
RISK OF SEVERE THUNDERSTORMS MAINLY IN SOUTH CENTRAL SOUTH
DAKOTA. THE MAIN THREAT WOULD BE HAIL TO THE SIZE OF NICKELS AND
WIND GUSTS TO 60 MPH. TONIGHT...A THUNDERSTORM COMPLEX WILL
LIKELY MOVE ACROSS THE AREA. A SEVERE STORM MAY ONCE AGAIN BE
POSSIBLE INITIALLY IN SOUTH CENTRAL SOUTH DAKOTA...BUT THE REST
OF THE ACTIVITY SHOULD REMAIN BELOW SEVERE LIMITS AS THE
ATMOSPHERE IS FAIRLY STABLE.

FLOODING...
A COMPLEX OF THUNDERSTORMS WILL LIKELY STRENGTHEN NEAR CENTRAL
SOUTH DAKOTA LATE TODAY...AND THEN MOVE INTO EAST CENTRAL SOUTH
DAKOTA THIS EVENING. AFTER EVENING...THE COMPLEX WILL TRACK
EASTWARD TOWARD SOUTHWEST MINNESOTA...AS WELL AS SOME POSSIBLE
DEVELOPMENT ON ITS SOUTHERN SIDE IN EXTREME SOUTHEAST SOUTH
DAKOTA...NORTHWEST IOWA AND EXTREME NORTHEAST NEBRASKA AFTER
MIDNIGHT INTO THE CRUX OF THE LOW LEVEL JET. THIS STORM COMPLEX
WILL PRODUCE AREAS OF HEAVY RAINFALL. WITH ANY HEAVY
RAINFALL...BE ALERT FOR URBAN FLOODING SITUATIONS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE WILL BE A LINGERING CHANCE OF THUNDERSTORMS ON SATURDAY
EAST OF THE JAMES RIVER...BUT THESE STORMS ARE NOT EXPECTED TO
BECOME SEVERE. THERE IS A SLIGHT RISK FOR SEVERE WEATHER LATE
TOMORROW MORNING WITH POSSIBLE THUNDERSTORM REGENERATION EAST OF
INTERSTATE 29.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

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

MJF/LAFLIN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
814 PM CDT FRI AUG 03 2007

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

0618 PM     FLASH FLOOD      7 S KIMBALL             43.64N 98.96W
08/03/2007                   BRULE              SD   COUNTY OFFICIAL

            ROAD 7 MILES SOUTH OF KIMBALL IS FLOODED. 4.00 INCHES OF
            RAIN HAVE ALREADY FALLEN, AND IT IS STILL RAINING.

0650 PM     FLASH FLOOD      KIMBALL                 43.75N 98.96W
08/03/2007                   BRULE              SD   TRAINED SPOTTER

            STREETS IN KIMALL ARE FLOODED. RAIN IS STILL COMING DOWN
            HARD.

0705 PM     FLASH FLOOD      10 S PUKWANA            43.63N 99.18W
08/03/2007                   BRULE              SD   LAW ENFORCEMENT

            SOUTHBOUND LANE OF HIGHWAY 50 UNDER WATER FOR 15 TO 20
            MINUTES.

&&

TRM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
817 PM CDT FRI AUG 03 2007

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

0800 PM     HEAVY RAIN       CHAMBERLAIN             43.81N 99.32W
08/03/2007  E6.00 INCH       BRULE              SD   LAW ENFORCEMENT

            ESTIMATED ACCUMULATED RAINFALL OF 5.5 TO 6 INCHES.

&&

JM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
848 PM CDT FRI AUG 03 2007

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

0847 PM     HEAVY RAIN       CHAMBERLAIN             43.81N 99.32W
08/03/2007  M5.92 INCH       BRULE              SD   TRAINED SPOTTER

            ACCUMULATED RAINFALL.

&&

JM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
915 PM CDT FRI AUG 03 2007

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

0850 PM     FUNNEL CLOUD     5 N ARMOUR              43.39N 98.34W
08/03/2007                   DOUGLAS            SD   TRAINED SPOTTER

&&

JM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
921 PM CDT FRI AUG 03 2007

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

0910 PM     FLASH FLOOD      STICKNEY                43.59N 98.44W
08/03/2007                   AURORA             SD   COUNTY OFFICIAL

            HOUSES THREATENED BY RISING WATER. WATER RUNNING OVER
            SOME ROADS.

&&

JM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
929 PM CDT FRI AUG 03 2007

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

0915 PM     HEAVY RAIN       14 W STICKNEY           43.59N 98.72W
08/03/2007  M5.50 INCH       AURORA             SD   TRAINED SPOTTER

            STILL RAINING.

&&

JM