Alert archive / Iowa / Flash Flood Warnings in 2012
Flash Flood Warning 16, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jun 20, 2012, 4:54 PM CDT for Buena Vista County, Ida County, Woodbury County, Iowa. It was in force for 2 hr. 1 report 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 20, 2012, 4:54 PM CDT (21:54 UTC)
- Expired
- Jun 20, 2012, 7:02 PM CDT
- In force
- 2 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Buena Vista County, IA, Ida County, IA, Woodbury County, IA
The radar
The Omaha radar (KOAX), 155 km from the middle of the area, began a volume at 21:56 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 20, 5:50 PM CDT | FLASH FLOOD | 5 Sw Ida Grove, IA | SOME FARM FIELDS FLOODED DUE TO HEAVY RAIN. HAD 3.8 INCHES OF RAIN THROUGH 645 PM...MOST FELL BEFORE 6 PM. |
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, 9.9 hours before the alert went out and 155 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
- 1133 J/kg
- Mixed-layer CIN
- -263 J/kg
- Mixed-layer LCL
- 898 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 379 m²/s²
- 0-3 km storm-relative helicity
- 419 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
317
WGUS53 KFSD 202154
FFWFSD
IAC021-093-193-210100-
/O.NEW.KFSD.FF.W.0016.120620T2154Z-120621T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
454 PM CDT WED JUN 20 2012
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
IDA COUNTY IN WEST CENTRAL IOWA
SOUTHEASTERN WOODBURY COUNTY IN WEST CENTRAL IOWA
SOUTHERN BUENA VISTA COUNTY IN NORTHWEST IOWA
* UNTIL 800 PM CDT
* AT 446 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
RAINFALL ESTIMATES OF 2 TO 4 INCHES HAVE FALLEN ACROSS THE WARNED
AREA. A REPORT FROM DANBURY INDICATED NEARLY FOUR INCHES OF
RAINFALL. AN ADDITIONAL ONE TO TWO INCHES OF RAINFALL IS EXPECTED
ACROSS THE WARNED AREA...CREATING FLASH FLOODING.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...IDA
GROVE...STORM LAKE...ALBERT CITY...ARTHUR...BATTLE CREEK...
DANBURY...GALVA...HOLSTEIN...LAKESIDE...NEWELL AND SMITHLAND.
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.
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 4257 9544 4256 9539 4260 9538 4289 9490
4256 9491 4255 9538 4249 9538 4247 9531
4222 9531 4220 9534 4220 9607
$$
BT2 follow-up statements
951
WGUS73 KFSD 202244
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
544 PM CDT WED JUN 20 2012
IAC021-093-193-210100-
/O.CON.KFSD.FF.W.0016.000000T0000Z-120621T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
IDA IA-BUENA VISTA IA-WOODBURY IA-
544 PM CDT WED JUN 20 2012
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN WOODBURY...
SOUTHERN BUENA VISTA AND IDA COUNTIES UNTIL 800 PM CDT...
AT 537 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
RAINFALL REPORTS OF TWO TO FOUR INCHES OF RAINFALL HAVE FALLEN
ACROSS THE WARNED AREA. SPECIFICALLY...2.75 INCHES WAS REPORTED IN
IDA GROVE AND 3.96 INCHES WERE REPORTED IN DANBURY. ALTHOUGH
RAINFALL RATES ARE DECREASING ACROSS THE WARNED AREA...ADDITIONAL
THUNDERSTORMS HAVE DEVELOPED UPSTREAM AND ARE EXPECTED TO MOVE
ACROSS THE AREA IN THE NEXT FEW HOURS. AN ADDITIONAL ONE TO TWO
INCHES OF RAINFALL IS EXPECTED ACROSS THE WARNED AREA...LEADING TO
FLASH FLOODING.
SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...IDA GROVE...STORM LAKE...ALBERT CITY...ARTHUR...BATTLE
CREEK...DANBURY...GALVA...HOLSTEIN...LAKESIDE...NEWELL AND SMITHLAND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS
AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING
AREAS ARE ALSO SUBJECT TO FLOODING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4257 9544 4256 9539 4260 9538 4289 9490
4256 9491 4255 9538 4249 9538 4247 9531
4222 9531 4220 9534 4220 9607
$$
BT277
WGUS73 KFSD 210002
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
702 PM CDT WED JUN 20 2012
IAC021-093-193-210014-
/O.CAN.KFSD.FF.W.0016.000000T0000Z-120621T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
IDA IA-BUENA VISTA IA-WOODBURY IA-
702 PM CDT WED JUN 20 2012
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHEASTERN
WOODBURY...SOUTHERN BUENA VISTA AND IDA COUNTIES IS CANCELLED...
WHILE RAINFALL IS EXPECTED TO CONTINUE ACROSS THE WARNED AREA FOR
THE NEXT FEW HOURS...IT IS NOT EXPECTED TO BE HEAVY ENOUGH TO LEAD
TO ADDITIONAL FLOODING.
FIVE MILES SOUTH OF IDA GROVE...A TRAINED SPOTTER REPORTED 3.8
INCHES OF RAIN LEADING TO FLOODING IN LOCAL FARM FIELDS.
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.
LAT...LON 4257 9544 4256 9539 4260 9538 4289 9490
4256 9491 4255 9538 4249 9538 4247 9531
4222 9531 4220 9534 4220 9607
$$
BTNearby
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.