1 flash flood, as filed by the National Weather Service.
Every event with a place to put it. Tap one for its entry below.
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.
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 20, 3:30 AM CST, 1 hour 30 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 430 AM CDT WED APR 20 2005 .DISCUSSION... LARGE SCALE CONTINUES TO FEATURE BROAD WRN TROUGH...WITH EVNG ANALYSIS SHOWING 110 KT JET ROUNDING AND PUSHING INTO CO/WY. UPR PATTERN SHOWING DIFFLUENCE OVR NRN PLAINS BETWEEN FLOW AROUND UPR TROUGH WEST...AND WK RIDGING W OF MS VALLEY. WK DISTURBANCE WANDERING INTO MEAN RIDGE WITH BROAD CONVECTIVE DEVELOPMENT ACRS NEBRASKA AND WRN SD OVERNIGHT...BLEEDING INTO SE JUST RECENTLY. SFC BNDRY SLOWLY DRIFTING SWRD THRU ERN NEBRASKA AND WRN IA...GETTING FRESH PUSH FROM CONVECTIVE RAIN POOL. NICE MCV SIGNATURE ON E OF VTN...BUT PCPN IN VCNTY REALLY DROPPING OFF IN LAST HR. MAIN CONCERNS TODAY ARE MANY... FROM SHORT TERM FLOODING THREAT IN NERN NEBRASKA AND ARND KSUX METRO...TO HEAVY RAINFALL/SVR THREAT FOR THU/THU NIGHT. FOR MORNING...PCPN BUCKING UP AGAINST MID LVL DEFORMATION AND DRY AIRSTREAM. WL CONTINUE TO EDGE NWRD AND LKLY TO GET CLOSE TO KHON/KFSD/KSPW LINE BEFORE SHEARING DOWN AS UPR SUPPORT SHIFTS BY FOR THE TIME AND FAVORS WK SUBSIDENCE THIS AFTN/EVNG. MOST INTENSE ACTION LKLY TO BE LIMITED TO EARLY MORNING ACRS FAR SRN CWA...WHERE ISOLATED NICKEL HAILER NOT OUT OF QUESTION NEXT COUPLE OF HOURS DUE TO ELEVATED INSTABILITY ON LLJ WHICH IS ALREADY SHOWING SIGNS OF REFOCUSING TO E ON FBY PROFILER...HENCE LIMIT ON TIME. WKLY STABILIZED AIRMASS SHUD KEEP ACTION THREAT LOW TO NON EXISTANT INTO EVNG...AS LOW LVL BNDRY CONTINUES TO WANDER SWRD TDA VIA CONVECTION AND FEEL FROM UPSTREAM WAVE. STRATUS FIELD BECOMING FAIRLY EXPANSIVE ACRS MN OVERNIGHT...WITH SOME FOG ACRS FAR ERN CWA WITH UPSLOPE. HOWEVER...THICKER CI SHUD PRECLUDE A GREAT THREAT FOR ANY MORE DENSE FOG...AND WL GRADUALLY LET WIND DOWN THIS MORNING. DRIER LOW LVL TRAJECTORY A BIT FARTHER UPSTREAM...BUT YET SET TO ARRIVE THIS AFTN INTO N AND NE. WITH ALL THE CLOUDS...TOUGH TO FIGURE TMPS...AND HATE TO GO TO THE WELL TOO MANY TIMES ON MIXING OF WARM NAM OFF SFC TMPS. WL KEEP A SHADE BELOW WHAT NAM/RUC WOULD SUGGEST. TONIGHT...AFTER QUIET START...UPR LOW TO WEST WL KICK OUT YET ANOTHER FORMIDIBLE PIECE OF ENERGY. UPSLOPE INDUCTION AND INCREASING DEEP SHEAR TO 50-60KTS WL HELP TO SPARK A NICE MCS OVERNIGHT STARTING IN THE HIGH PLAINS...AND LOOKING TO ROLL ACRS AREA JUST TO S. MO RVR LKLY TO GET INTO ACTION AT LATER NIGHT HOURS WITH NOSE OF LOW TO MID LVL WAA PUSHING UP...BUT AGAIN FIGHTING ELY TRAJECTORY OVR NERN 1/2. UPR LOW THEN WANDERS OUT INTO PLAINS THU AND THU NIGHT...BEFORE INTERACTION WITH NRN STREAM PULLS MORE QUICKLY EWRD LTR THU INTO EARLY FRI. STRONG DYNAMICS AND NO LACK OF MOISTURE IN VICINITY ARE DEFINITELY IN FAVOR OF HIGH POPS FOR MOST AREAS. MAIN DIV Q EXPECTED TO TRACK ACRS SRN SD INTO NWRN IA. WITH SUCH AN UPR SYSTEM...NOT UNEXPECTED THAT SOME DEGREE OF DRY SLOT WORKS NWRD AHEAD OF SYSTEM...WHICH COULD REACH FAR SERN SD AND NWRN IA WITH MORE IN WAY OF ELEVATED INSTABILITY. DEPENDING ON DEGREE OF OVERNIGHT CONVECTIVE CONTAMINATION...COULD BE A LOW GRADE SEVERE WX THREAT FOR ELEVATED HAILERS IN SRN CWA...AS SFC BNDRY LKLY TO REMAIN WELL TO S. PRECIP DEVELOPMENT LKLY TO BECOME FOCUSED ON LIMITING STREAMLINE IN MID LVL DEFORMATION NORTH OF UPR LOW TRACK...WHICH MAY BE A BIT TO N OF WHERE MDL QPF SUGGESTED. WILL CERTAINLY HAVE TO WATCH WHERE HEAVY PCPN BAND SETS UP ON THU AND THU NIGHT...AS FFG IS FAIRLY LOW...ESPLY THRU SRN TIER. FOR NOW...WL HOLD OFF UNTIL THINGS ARE A BIT MORE CLEAR ON LOCATION...WITH PLENTY OF LEAD TIME WITH AFTN/NEXT NIGHT PACKAGE. OTHER THAN LINGERING PCPN EARLY IN SERN CWA FRI...WL SET UP A VERY WINDY AND ALMOST BLUSTERY FRIDAY. NAM/GFS BOTH SUGGEST CYCLONIC FLOW WL KEEP THREAT OF SOME SC AROUND INTO AFTN... BUT OVERALL SUBSIDENCE SHUD WORK TOWARD CLRG DURING AFTN. AS GRADIENT WKNS FRI NIGHT...AND WITH DRY AIR AND MAINLY CLEAR SKIES... TMPS SAT MORNING COULD EASILY REACH FREEZING FOR FIRST TIME IN A LONG WHILE FOR MANY NORTHERN AND WESTERN AREAS...A THREAT TO OUR EARLY SPRING ACCELERATED VEGETATION. MADE SOME ADJUSTMENTS TO SAT/SUN TMPS TO ACCOUNT FOR SLOWER PROGRESSION OF COOL SFC RIDGE AS SUGGESTED BY SUPERENSEMBLE TECHNIQUE...OTHERWISE LEFT REMAINDER OF EXTENDED AS IS. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && CHAPMAN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 512 AM CDT WED APR 20 2005 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-211200- 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- 512 AM CDT WED APR 20 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... THROUGH 7 AM...THUNDERSTORMS SOUTH OF A LINE FROM NEAR STORM LAKE TO SIOUX CITY MAY PRODUCE HAIL UP TO PENNY SIZE...ALONG WITH AREAS OF PONDING IN POOR DRAINAGE AREAS. OTHER SCATTERED THUNDERSTORMS WESTWARD BACK THROUGH THE MISSOURI AND JAMES VALLEYS THIS MORNING WILL NOT BE SEVERE. OTHER THUNDERSTORMS WILL BEGIN ACROSS THE WESTERN PLAINS OVERNIGHT...AND MORE INTO SOUTH CENTRAL SOUTH DAKOTA TOWARD MIDNIGHT. THESE THUNDERSTORMS WILL DEVELOP INTO AREAS WEST OF A LINE FROM HURON TO PARKER TO STORM LAKE BY DAYBREAK TUESDAY...BUT ARE NOT EXPECTED TO BE SEVERE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY AFTER SOME EARLY MORNING THUNDERSTORMS MAINLY THROUGH THE MISSOURI RIVER CORRIDOR...EXPECT FAIRLY WIDESPREAD THUNDERSTORM ACTIVITY TO WORK EASTWARD ACROSS THE AREA THURSDAY THROUGH THURSDAY NIGHT. SOME STORMS BY LATE AFTERNOON AND EVENING ACROSS THE LOWER MISSOURI VALLEY FROM AROUND TYNDALL THROUGH SIOUX CITY AND STORM LAKE WILL BE CAPABLE OF PRODUCING HAIL TO HALF DOLLAR SIZE. ANOTHER CONCERN WILL BE WITH THE THREAT OF HEAVY RAINFALL...MAINLY IN AREAS ALONG AND SOUTH OF INTERSTATE 90. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE PRIOR TO 7 AM FROM SIOUX CITY TO STORM LAKE. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Runoff from heavy rain caused street flooding, including water covering a large part of Dakota Avenue.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2005Every state in 2005This day in weather historyWarnings in Nebraska, April 2005
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 2026-09-24. Each event’s entry at NCEI: 5447587.