Alert archive / Iowa / Flash Flood Warnings in 2014
Flash Flood Warning 33, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jun 26, 2014, 5:37 PM CDT for Lyon County, O'Brien County, Sioux County, Iowa. It was in force for 3 hr. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 26, 2014, 5:37 PM CDT (22:37 UTC)
- Expired
- Jun 26, 2014, 8:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Lyon County, IA, O'Brien County, IA, Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 80 km from the middle of the area, began a volume at 22:37 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 26, 5:50 PM CDT | FLASH FLOOD | 2 E Boyden, IA | WATER RUNNING OVER HIGHWAY 18 EAST OF BOYDEN. |
| Jun 26, 5:50 PM CDT | FLASH FLOOD | Boyden, IA | SEVERAL STREET INUNDATED WITH UP TO A FOOT OF WATER AROUND TOWN. |
| Jun 26, 6:20 PM CDT | HEAVY RAIN 6.75 | Boyden, IA | RAINFALL AMOUNT FELL IN ABOUT 3 HOURS. |
| Jun 26, 8:30 PM CDT | FLASH FLOOD | Boyden, IA | WATER CONTINUES OVER HIGHWAY 18 AT BOYDEN. |
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, 10.6 hours before the alert went out and 208 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
- 1326 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 1035 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
342
WGUS53 KFSD 262237
FFWFSD
IAC119-141-167-270130-
/O.NEW.KFSD.FF.W.0033.140626T2237Z-140627T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
537 PM CDT THU JUN 26 2014
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEASTERN SIOUX COUNTY IN NORTHWEST IOWA
NORTHWESTERN O'BRIEN COUNTY IN NORTHWEST IOWA
SOUTHEASTERN LYON COUNTY IN NORTHWEST IOWA
* UNTIL 830 PM CDT
* AT 533 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES TWO TO THREE INCHES
OF RAINFALL OVER THE WARNED AREA. THUNDERSTORMS CONTINUE TO
BACKBUILD ACROSS THE SAME AREA...CREATING THE POTENTIAL FOR
ADDITIONAL HEAVY RAIN ACROSS THE AREA.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
BOYDEN...HOSPERS...MATLOCK AND SHELDON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.
&&
LAT...LON 4301 9585 4301 9610 4330 9613 4330 9586
4326 9587 4325 9582
$$
BT1 follow-up statement
884
WGUS73 KFSD 262257
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
557 PM CDT THU JUN 26 2014
IAC119-141-167-270130-
/O.CON.KFSD.FF.W.0033.000000T0000Z-140627T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SIOUX IA-O'BRIEN IA-LYON IA-
557 PM CDT THU JUN 26 2014
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN LYON...
NORTHWESTERN O'BRIEN AND NORTHEASTERN SIOUX COUNTIES UNTIL 830 PM
CDT...
AT 550 PM CDT...WEATHER SPOTTERS REPORTED THUNDERSTORMS WITH VERY
HEAVY RAINFALL ACROSS THE WARNED AREA. DOPPLER RADAR ESTIMATED THREE
TO FOUR INCHES OF RAIN NEAR BOYDEN. SIOUX COUNTY EMERGENCY MANAGERS
REPORTED WATER OVER HIGHWAY 18 NEAR BOYDEN.
SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...BOYDEN...HOSPERS...MATLOCK AND SHELDON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4301 9585 4301 9610 4330 9613 4330 9586
4326 9587 4325 9582
$$
BTThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 3:46 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola, Sioux | 33 min |
| Jun 26, 5:34 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien, Sioux | 41 min |
| Jun 26, 5:41 PM CDT | Flash Flood Warning | FSD | Woodbury | 3 hr |
| Jun 26, 6:08 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien, Sioux | 23 min |
Nearby
Flash Flood Warnings in Iowa, 2014Every flash flood warning in 2014
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.