Alert archive / South Dakota / Flash Flood Warnings in 2012
Flash Flood Warning 3, NWS Aberdeen, SD
NWS Aberdeen, SD issued this flash flood warning at Jun 20, 2012, 2:11 AM CDT for Codington County, South Dakota. It was in force for 5 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, 2:11 AM CDT (07:11 UTC)
- Expired
- Jun 20, 2012, 6:47 AM CDT
- In force
- 5 hr
- Issued by
- NWS Aberdeen, SD
- Area
- Storm-based polygon
- Flood severity
- None
County Codington County, SD
The radar
The Aberdeen radar (KABR), 112 km from the middle of the area, began a volume at 07:11 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, 2:15 AM CDT | FLASH FLOOD | Watertown, SD | STREET FLOODING...RADAR ESTIMATING 3 TO 4 INCHES OF RAINFALL IN LESS THAN TWO HOURS |
| Jun 20, 2:25 AM CDT | FLASH FLOOD | Watertown, SD | INTERSECTION OF HWY 20 AND 3RD AVENUE NORTH AS WELL AS SEVERAL OTHER LOCATIONS ON HWY 20 HAVE WATER RUNNING ABOVE CURB LINE AND RUNNING OVER THE ROAD |
| Jun 20, 2:30 AM CDT | FLASH FLOOD | Watertown, SD | WATER IS RUNNING OVER CURB LINE ON HWY 212 BY PERKINS...ALSO BUDGET ONE HOTEL AT INTERSECTION OF HWY 212 AND 81 HAS 8 TO 10 ROOMS FLOODED |
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, 7.2 hours before the alert went out and 95 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.
023 WGUS53 KABR 200711 FFWABR SDC029-201300- /O.NEW.KABR.FF.W.0003.120620T0711Z-120620T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE ABERDEEN SD 211 AM CDT WED JUN 20 2012 THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL CODINGTON COUNTY IN NORTHEAST SOUTH DAKOTA... * UNTIL 800 AM CDT * AT 209 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH FLOODING ACROSS THE WARNED AREA...TO INCLUDE WITHIN THE CITY OF WATERTOWN. * SOME LOCATIONS THAT COULD EXPERIENCE FLOODING INCLUDE... WATERTOWN...DAKOTA SIOUX CASINO...RAUVILLE AND SANDY SHORE STATE PARK. PRECAUTIONARY/PREPAREDNESS ACTIONS... ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. && LAT...LON 4501 9732 4501 9700 4482 9700 4483 9731 $$ CONNELLY
2 follow-up statements
807 WGUS73 KABR 200814 FFSABR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 314 AM CDT WED JUN 20 2012 SDC029-201300- /O.CON.KABR.FF.W.0003.000000T0000Z-120620T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CODINGTON SD- 314 AM CDT WED JUN 20 2012 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CENTRAL CODINGTON COUNTY UNTIL 800 AM CDT... AT 310 AM CDT...THE CITY OF WATERTOWN HAD RECIEVED OVER 3 INCHES OF RAIN...LEADING TO FLOODING FOR PORTIONS OF THE CITY. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE... WATERTOWN...DAKOTA SIOUX CASINO...RAUVILLE AND SANDY SHORE STATE PARK. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE MINOR FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. && LAT...LON 4501 9732 4501 9700 4482 9700 4483 9731 $$ CONNELLY
247 WGUS73 KABR 201147 FFSABR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 647 AM CDT WED JUN 20 2012 SDC029-201158- /O.CAN.KABR.FF.W.0003.000000T0000Z-120620T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CODINGTON SD- 647 AM CDT WED JUN 20 2012 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CENTRAL CODINGTON 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. LAT...LON 4501 9732 4501 9700 4482 9700 4483 9731 $$ CONNELLY
The 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, 2:28 AM CDT | Flash Flood Warning | ABR | Codington, Grant | 4 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.