Alert archive / South Dakota / Flash Flood Warnings in 2012
Flash Flood Warning 14, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at May 27, 2012, 9:32 PM CDT for Dixon County, Nebraska; Clay County, Union County, South Dakota. It was in force for 4 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
- May 27, 2012, 9:32 PM CDT (02:32 UTC)
- Expired
- May 28, 2012, 1:58 AM CDT
- In force
- 4 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Dixon County, NE, Clay County, SD, Union County, SD
The radar
The Sioux Falls radar (KFSD), 118 km from the middle of the area, began a volume at 02:34 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, 2.5 hours before the alert went out and 141 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
- 849 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 2094 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
074
WGUS53 KFSD 280232
FFWFSD
NEC051-SDC027-127-280830-
/O.NEW.KFSD.FF.W.0014.120528T0232Z-120528T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
932 PM CDT SUN MAY 27 2012
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
DIXON COUNTY IN NORTHEAST NEBRASKA
SOUTHEASTERN CLAY COUNTY IN SOUTHEAST SOUTH DAKOTA
* UNTIL 330 AM CDT
* AT 925 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. AN
ESTIMATED 3 INCHES OF RAIN HAS FALLEN NEAR MASKELL AND ROAD
FLOODING HAS BEEN REPORTED. AN ADDITIONAL INCH OF RAINFALL IS
POSSIBLE THIS EVENING.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PONCA...VERMILLION...ALLEN...CONCORD...DIXON...ELK POINT...
MARTINSBURG...MASKELL AND NEWCASTLE.
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 4227 9703 4276 9703 4283 9698 4274 9663
4271 9663 4269 9659 4226 9697 4226 9701
$$
HANKO2 follow-up statements
620
WGUS53 KFSD 280328
FFWFSD
NEC051-SDC027-127-280930-
/O.EXT.KFSD.FF.W.0014.000000T0000Z-120528T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1028 PM CDT SUN MAY 27 2012
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS EXTENDED THE
* FLASH FLOOD WARNING FOR...
CENTRAL UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
DIXON COUNTY IN NORTHEAST NEBRASKA
SOUTHEASTERN CLAY COUNTY IN SOUTHEAST SOUTH DAKOTA
* UNTIL 430 AM CDT MONDAY
* AT 1025 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR
INDICATES FOUR TO FIVE INCHES OF RAIN HAS FALLEN OVER THE WARNED
AREA. AN ADDITIONAL HALF OF AN INCH TO AN INCH OF RAIN IS EXPECTED
OVER THE NEXT FEW HOURS.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PONCA...VERMILLION...ALLEN...CONCORD...DIXON...ELK POINT...
MARTINSBURG...MASKELL AND NEWCASTLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4227 9703 4276 9703 4283 9698 4274 9663
4271 9663 4269 9659 4226 9697 4226 9701
$$
BT480
WGUS73 KFSD 280658
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
158 AM CDT MON MAY 28 2012
NEC051-SDC027-127-280712-
/O.CAN.KFSD.FF.W.0014.000000T0000Z-120528T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DIXON NE-CLAY SD-UNION SD-
158 AM CDT MON MAY 28 2012
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CENTRAL UNION...
SOUTHEASTERN CLAY AND DIXON COUNTIES 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 WAS OBSERVED PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT OR TO THE NATIONAL WEATHER SERVICE IN SIOUX FALLS.
LAT...LON 4227 9703 4276 9703 4283 9698 4274 9663
4271 9663 4269 9659 4226 9697 4226 9701
$$
CHENARDThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 9:18 PM CDT | Severe Thunderstorm Warning | FSD | Dakota, Dixon | 27 min |
| May 27, 7:11 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Union | 34 min |
| May 27, 7:22 PM CDT | Flash Flood Warning | FSD | Clay, Lincoln, Union | 7 hr |
| May 27, 7:31 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 29 min |
| May 27, 9:42 PM CDT | Severe Thunderstorm Warning | FSD | Union | 10 min |
Nearby
Flash Flood Warnings in South Dakota, 2012Flash Flood Warnings in Nebraska, 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.