Alert archive / Iowa / Flash Flood Warnings in 2004
Flash Flood Warning 31, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Sep 15, 2004, 3:20 AM CDT for Lyon County, Iowa; Lincoln County, South Dakota. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 15, 2004, 3:20 AM CDT (08:20 UTC)
- Expired
- Sep 15, 2004, 6:15 AM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
Counties Lyon County, IA, Lincoln County, SD
The radar
The Sioux Falls radar (KFSD), 33 km from the middle of the area, began a volume at 08:22 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 8.3 hours before the alert went out and 223 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1520 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1898 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 290 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 8.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS53 KFSD 150820
FFWFSD
IAC119-SDC083-151115-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
320 AM CDT WED SEP 15 2004
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
LYON COUNTY IN NORTHWEST IOWA
LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA
* UNTIL 615 AM CDT
* AT 318 AM CDT...DOPPLER RADAR INDICATED RAINFALL AMOUNTS OF 2 TO 3
INCHES ACROSS BOTH LINCOLN AND LYON COUNTY. MORE RAINFALL IS
EXPECTED AS THUNDERSTORMS CONTINUE TO MOVE TO THE NORTHEAST AT 25
MPH OVER THE SAME AREAS.
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.
LAT...LON 4332 9693 4310 9692 4310 9650 4328 9659
4326 9608 4349 9598 4349 9626 4350 9692
$$
JRM1 follow-up statement
000
WGUS73 KFSD 150913
FFSFSD
IAC119-SDC083-150920-
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
410 AM CDT WED SEP 15 2004
...THE FLASH FLOOD WARNING FOR LINCOLN AND LYON COUNTIES IS
CANCELLED...
AT 410 AM CDT...THE HEAVY RAINS HAVE MOVED EAST OF THE AREA AND THE
THREAT FOR FLASH FLOODING HAS DIMINISHED. SOME MODERATE TO HEAVY
RAIN SHOULD MOVE OVER THE AREA THROUGH 6 AM...BUT IT IS NOT EXPECTED
TO PRODUCE ADDITIONAL FLOODING.
LAT...LON 4332 9693 4310 9692 4310 9650 4328 9659
4326 9608 4349 9598 4349 9626 4350 9692
$$
RSRWhat forecasters said that day
The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Sep 14, 9:40 PM CDT, 5 hours 40 minutes earlier.
Area forecast discussion, Sep 14, 9:40 PM CDT, 5 hours 40 minutes before
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 940 PM CDT CDT TUE SEP 14 2004 .DISCUSSION.. HAVE CANCELLED FLASH FLOOD WARMING FOR PARTS OF NORTHWEST IOWA WITH NO SERIOUS FLOODING PROBLEM BEING REPORTED AS OF 02Z. DID HOWEVER KEEP THE FLASH FLOOD WATCH GOING FOR NERN NEBRASKA ACROSS NW IOWA IN SW MINNESOTA UNTIL 300 AM FOR POSSIBLE HEAVY RAIN IN TSTMS THAT CONTINUE TO DEVELOP. QUESTION COMES IN HOW FAR NORTH BOUNDARY TO SOUTH WILL LIFT NORTH TONIGHT AS WAVE COMES UP FROM THE SOUTHWEST. AS 0230Z TSTMS WERE DEVELOPING FURTHER BACK TO THE SW ALONG THE MISSOURI RIVER. FOR NOW DO NOT SEE ANYTHING SEVERE AND TALKING TO SPC THEY WILL NOT ISSUE ANY ADDITIONAL WATCH FOR OUR AREA...WILL LET CURRENT WATCH EXPIRE AT 03Z. WILL DO UPDATE TO ZONES AND GRIDS TO ADJUST TIMING AND LOCATION OF PCP AREA OTHERWISE LOW TEMPS FOR TONIGHT LOOK OK. .FSD...WATCHES/WARNINGS/ADVISORIES... SD...FLOOD WATCH TNGT XTRM SERN SD UNION CO MN...FLOOD WATCH TNGT JACKSON CO IA...FLOOD WATCH TNGT ALL OF NWRN IA XCP LYON CO NE...FLOOD WATCH TNGT DIXON AND DAKOTA COS && WB
Hazardous weather outlook, Sep 14, 11:47 AM CDT, 15 hours 33 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1147 AM CDT TUE SEP 14 2004 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-151200- 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- 1147 AM CDT TUE SEP 14 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... THUNDERSTORMS WILL REDEVELOP NEAR A VERMILLION TO SPENCER IOWA LINE AFTER 4 PM THIS AFTERNOON. SOME STORMS MAY BECOME SEVERE LATE THIS AFTERNOON AND EARLY THIS EVENING ALONG AND SOUTH OF A VERMILLION TO SPIRIT LAKE LINE. VERY HEAVY RAINFALL...HAIL THE SIZE OF HALF DOLLARS AND WIND GUSTS TO 60 MPH ARE THE MAIN THREATS. AN ISOLATED TORNADO WILL ALSO BE POSSIBLE ALONG AND JUST SOUTH OF THIS FRONT. THE THREAT FOR TORNADOES WILL BE MAINLY SOUTH OF A SIOUX CITY TO LINN GROVE LINE. FLOODING... THUNDERSTORMS THAT DEVELOP THIS AFTERNOON AND EVENING OVER NORTHEAST NEBRASKA...NORTHWEST IOWA...FAR SOUTHEAST SOUTH DAKOTA AND FAR SOUTHERN MINNESOTA WILL HAVE THE POTENTIAL TO PRODUCE VERY HEAVY RAINFALL. SOME LOCATIONS COULD SEE AMOUNTS OF 2 TO 4 INCHES...WITH HOURLY RAINFALL RATES APPROACHING TWO INCHES. A FEW RIVERS....CREEKS AND STREAMS COULD APPROACH BANKFULL AND URBAN FLOODING WILL ALSO BE POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE LIKELY AFTER 500 PM CDT. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK. 08
In the hours before
Special weather statement, Sep 14, 9:52 PM CDT, 5 hours 28 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 952 PM CDT TUE SEP 14 2004 IAZ014-021-022-031-032-NEZ013-014-150310- BUENA VISTA IA-CHEROKEE IA-CLAY IA-DAKOTA NE-DIXON NE-IDA IA- WOODBURY IA- 952 PM CDT TUE SEP 14 2004 ...SEVERE THUNDERSTORM WATCH NUMBER 819 WILL BE ALLOWED TO EXPIRE AT 10 PM CDT... THE VALID PORTIONS OF SEVERE THUNDERSTORM WATCH NUMBER 819 WILL BE ALLOWED TO EXPIRE AT 10 PM CDT. THIS INCLUDES BUENA VISTA... CHEROKEE...CLAY...IDA AND WOODBURY COUNTIES OF NORTHWEST IOWA...AND DIXON AND DAKOTA COUNTIES IN EXTREME NORTHEAST NEBRASKA. THUNDERSTORMS WILL CONTINUE AT TIMES OVERNIGHT...BUT THE THREAT OF WIDESPREAD SEVERE WEATHER HAS ENDED ACROSS THE AREA. LOCALLY HEAVY RAINFALL WILL BE THE MAIN THREAT FROM THESE STORMS OVERNIGHT...AND A FLOOD WATCH FOR FLASH FLOODING REMAINS IN EFFECT UNTIL 3 AM CDT. CHAPMAN
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 7:12 PM CDT | Flash Flood Warning | FSD | Buena Vista, Cherokee, Clay, Dickinson, O'Brien | 4 hr |
| Sep 15, 4:06 AM CDT | Flash Flood Warning | FSD | Clay, Dickinson, O'Brien, Osceola | 114 min |
| Sep 15, 5:26 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 34 min |
| Sep 15, 7:01 AM CDT | Flash Flood Warning | FSD | Clay, Dickinson, O'Brien | 119 min |
Nearby
Flash Flood Warnings in Iowa, 2004Flash Flood Warnings in South Dakota, 2004Every flash flood warning in 2004
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.