Alert archive / South Dakota / Flash Flood Warnings in 2012
Flash Flood Warning 4, NWS Aberdeen, SD
NWS Aberdeen, SD issued this flash flood warning at Jun 20, 2012, 2:28 AM CDT for Codington County, Grant County, South Dakota. It was in force for 4 hr. 3 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 20, 2012, 2:28 AM CDT (07:28 UTC)
- Expired
- Jun 20, 2012, 6:49 AM CDT
- In force
- 4 hr
- Issued by
- NWS Aberdeen, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Codington County, SD, Grant County, SD
The radar
The Aberdeen radar (KABR), 139 km from the middle of the area, began a volume at 07:29 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, 4:00 AM CDT | FLASH FLOOD | 4 Wnw Milbank, SD | WATER RUNNING OVER COUNTY ROAD |
| Jun 20, 4:30 AM CDT | FLASH FLOOD | 4 Sw Milbank, SD | WATER RUNNING OVER COUNTY ROAD |
| Jun 20, 5:30 AM CDT | FLASH FLOOD | Stockholm, SD | WATER OVER COUNTY ROAD NEAR STOCKHOLM RESULTED IN A MINOR WASHOUT. EVENT TOTAL RAINFALL 3.50 INCHES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 7.5 hours before the alert went out and 135 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
- 322 J/kg
- Mixed-layer CIN
- -368 J/kg
- Mixed-layer LCL
- 663 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.2
The text
As transmitted, in the capitals the NWS used until 2016.
339
WGUS53 KABR 200728
FFWABR
SDC029-051-201330-
/O.NEW.KABR.FF.W.0004.120620T0728Z-120620T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
228 AM CDT WED JUN 20 2012
THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EASTERN GRANT COUNTY IN NORTHEAST SOUTH DAKOTA...
NORTHEASTERN CODINGTON COUNTY IN NORTHEAST SOUTH DAKOTA...
* UNTIL 830 AM CDT
* AT 225 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. RADAR ESTIMATES OF 3 TO 4 INCHES OF RAIN HAS
FALLEN...WITH ADDITIONAL RAIN ON THE WAY.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT COULD EXPERIENCE FLOODING INCLUDE...LA
BOLT...SOUTH SHORE...STOCKHOLM...STRANDBURG...TROY AND TWIN BROOKS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
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.
&&
LAT...LON 4512 9648 4497 9674 4498 9686 4508 9699
4526 9671
$$
CONNELLY2 follow-up statements
070
WGUS73 KABR 200858
FFSABR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
358 AM CDT WED JUN 20 2012
SDC029-051-201330-
/O.CON.KABR.FF.W.0004.000000T0000Z-120620T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRANT SD-CODINGTON SD-
358 AM CDT WED JUN 20 2012
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHEASTERN CODINGTON
AND EASTERN GRANT COUNTIES UNTIL 830 AM CDT...
AT 358 AM CDT...DOPPLER RADAR HAS INDICATED UPWARDS OF 5 INCHES OF
RAINFALL HAS OCCURRED IN THE WARNED AREA.
SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...LA
BOLT...SOUTH SHORE...STOCKHOLM...STRANDBURG AND TROY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES... AS WELL AS
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4512 9648 4497 9674 4498 9686 4508 9699
4526 9671
$$
CONNELLY341
WGUS73 KABR 201149
FFSABR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
649 AM CDT WED JUN 20 2012
SDC029-051-201204-
/O.CAN.KABR.FF.W.0004.000000T0000Z-120620T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRANT SD-CODINGTON SD-
649 AM CDT WED JUN 20 2012
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHEASTERN
CODINGTON AND EASTERN GRANT 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 HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
LAT...LON 4512 9648 4497 9674 4498 9686 4508 9699
4526 9671
$$
CONNELLYThe office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 11:42 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo, Lyman | 63 min |
| Jun 20, 2:11 AM CDT | Flash Flood Warning | ABR | Codington | 5 hr |
| Jun 20, 2:51 AM CDT | Flash Flood Warning | ABR | Grant, Roberts | 4 hr |
Nearby
Flash Flood Warnings in South Dakota, 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.