Alert archive / Iowa / Flash Flood Warnings in 2012
Flash Flood Warning 1, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Apr 14, 2012, 11:59 PM CDT for Woodbury County, Iowa. 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
- Apr 14, 2012, 11:59 PM CDT (04:59 UTC)
- Expired
- Apr 15, 2012, 2:59 AM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
County Woodbury County, IA
The radar
The Omaha radar (KOAX), 124 km from the middle of the area, began a volume at 05:02 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 5.0 hours before the alert went out and 125 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 871 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 276 m²/s²
- 0-3 km storm-relative helicity
- 483 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
266
WGUS53 KFSD 150459
FFWFSD
IAC193-151100-
/O.NEW.KFSD.FF.W.0001.120415T0459Z-120415T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1159 PM CDT SAT APR 14 2012
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL WOODBURY COUNTY IN WEST CENTRAL IOWA
* UNTIL 600 AM CDT SUNDAY
* AT 1152 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR
INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED
AREA. RAINFALL AMOUNTS IN EXCESS OF TWO INCHES FELL ACROSS THE AREA
EARLIER IN THE EVENING...AND WITH THUNDERSTORMS MOVING THROUGH THE
AREA ADDITIONAL AMOUNTS OF ONE HALF TO 1 INCH OF RAINFALL WILL BE
POSSIBLE THROUGH THE LATE NIGHT HOURS.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ANTHON...HORNICK...LAWTON...MOVILLE...PIERSON...SALIX...SLOAN AND
SMITHLAND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
&&
LAT...LON 4250 9628 4256 9625 4256 9585 4222 9586
4222 9632
$$
JM1 follow-up statement
806
WGUS73 KFSD 150759
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
259 AM CDT SUN APR 15 2012
IAC193-150814-
/O.CAN.KFSD.FF.W.0001.000000T0000Z-120415T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WOODBURY IA-
259 AM CDT SUN APR 15 2012
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CENTRAL WOODBURY
COUNTY IS CANCELLED...
EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
IF FLOODING WAS OBSERVED PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT OR TO THE NATIONAL WEATHER SERVICE IN SIOUX FALLS.
LAT...LON 4250 9628 4256 9625 4256 9585 4222 9586
4222 9632
$$
SCHMITThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 3:26 PM CDT | Wind Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, O'Brien and 1 more | 4 hr |
Nearby
Flash Flood Warnings in Iowa, 2012Every flash flood warning in 2012
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.