Alert archive / Iowa / Flash Flood Warnings in 2007
Flash Flood Warning 18, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jun 10, 2007, 4:32 PM CDT for Lyon County, Sioux County, Iowa. It was in force for 58 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 10, 2007, 4:32 PM CDT (21:32 UTC)
- Expired
- Jun 10, 2007, 5:30 PM CDT
- In force
- 58 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lyon County, IA, Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 59 km from the middle of the area, began a volume at 21:32 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 10, 5:05 PM CDT | FLASH FLOOD | 4 N Rock Valley, IA | WATER RUNNING ACROSS COUNTY ROAD A52 ON LYON AND SIOUX COUNTY LINE. |
| Jun 10, 5:05 PM CDT | FLASH FLOOD | 5 Nne Rock Valley, IA | REPORTED WATER RUNNING OVER THE ROAD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 9.5 hours before the alert went out and 213 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
- 896 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 1337 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS53 KFSD 102133 FFWFSD IAC119-167-102230- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 432 PM CDT SUN JUN 10 2007 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL LYON COUNTY IN NORTHWEST IOWA NORTH CENTRAL SIOUX COUNTY IN NORTHWEST IOWA * UNTIL 530 PM CDT * AT 428 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM THUNDERSTORM LOCATED BETWEEN DOON AND ROCK VALLEY. THIS STORM WAS MOVING VERY SLOWLY TO THE EAST AT 5 MPH. IN ADDITION TO PRODUCING LARGE HAIL...THIS STORM IS CAPABLE OF PRODUCING UP TO 2 INCHES OF RAIN IN LESS THAN ONE HOUR. THIS MAY CAUSE RAPID RISES IN CREEKS AND SOME ROADS TO WASH OUT. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. 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 4331 9641 4319 9633 4321 9609 4336 9612 $$ SCHUMACHER
2 follow-up statements
000 WGUS73 KFSD 102214 FFSFSD FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 512 PM CDT SUN JUN 10 2007 IAC119-167-102230- LYON IA-SIOUX IA- 512 PM CDT SUN JUN 10 2007 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR NORTH CENTRAL SIOUX AND SOUTH CENTRAL LYON COUNTIES... AT 508 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER BETWEEN DOON AND ROCK VALLEY. THIS STORM WAS DRIFTING TO THE EAST AT AROUND 5 MPH. THIS STORM IS CAPABLE OF PRODUCING UP TO 2 INCHES OF RAIN IN LESS THAN ONE HOUR. AT 505 PM CDT...TRAINED WEATHER SPOTTERS REPORTED VERY HEAVY RAIN 4 MILES NORTHEAST OF DOON WHICH HAS RESULTED IN WATER RUNNING OVER GRAVELS ROADS. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SUNDAY EVENING FOR NORTHWEST IOWA. LAT...LON 4331 9641 4319 9633 4321 9609 4336 9612 $$ SCHUMACHER
000 WGUS73 KFSD 102219 CCA FFSFSD FLASH FLOOD STATEMENT...CORRECTED FOR LOCATION OF FLOODING NATIONAL WEATHER SERVICE SIOUX FALLS SD 512 PM CDT SUN JUN 10 2007 IAC119-167-102230- LYON IA-SIOUX IA- 512 PM CDT SUN JUN 10 2007 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR NORTH CENTRAL SIOUX AND SOUTH CENTRAL LYON COUNTIES... AT 508 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER BETWEEN DOON AND ROCK VALLEY. THIS STORM WAS DRIFTING TO THE EAST AT AROUND 5 MPH. THIS STORM IS CAPABLE OF PRODUCING UP TO 2 INCHES OF RAIN IN LESS THAN ONE HOUR. AT 505 PM CDT...TRAINED WEATHER SPOTTERS REPORTED VERY HEAVY RAIN 4 MILES NORTHEAST OF ROCK VALLEY WHICH HAS RESULTED IN WATER RUNNING OVER GRAVELS ROADS. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SUNDAY EVENING FOR NORTHWEST IOWA. LAT...LON 4331 9641 4319 9633 4321 9609 4336 9612 $$ SCHUMACHER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 1:39 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 36 min |
| Jun 10, 3:58 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 47 min |
| Jun 10, 4:42 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 48 min |
| Jun 10, 5:27 PM CDT | Flash Flood Warning | FSD | Lyon, Sioux | 93 min |
Nearby
Flash Flood Warnings in Iowa, 2007Every flash flood warning in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.