Alert archive / South Dakota / Flash Flood Warnings in 2012

Flash Flood Warning 7, NWS Sioux Falls, SD

May 5, 20124 counties in South Dakota

NWS Sioux Falls, SD issued this flash flood warning at May 5, 2012, 7:37 PM CDT for 4 counties in South Dakota. It was in force for 7 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
May 5, 2012, 7:37 PM CDT (00:37 UTC)
Expired
May 6, 2012, 3:06 AM CDT
In force
7 hr
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Flood severity
None

Counties Davison County, SD, Hanson County, SD, Miner County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 99 km from the middle of the area, began a volume at 00:38 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

TimeReportWhereRemark
May 5, 8:00 PM CDTFLASH FLOOD8 Ne Mitchell, SDBASEMENT FLOODING

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, 0.6 hours before the alert went out and 122 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.

Skew-T log-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 2012-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2012-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 201 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
657 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
201 m²/s²
0-3 km storm-relative helicity
278 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

507 
WGUS53 KFSD 060037
FFWFSD
SDC035-061-097-111-060430-
/O.NEW.KFSD.FF.W.0007.120506T0037Z-120506T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
737 PM CDT SAT MAY 5 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN DAVISON COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHWESTERN HANSON COUNTY IN SOUTHEAST SOUTH DAKOTA
  SOUTHEASTERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA
  SOUTHWESTERN MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA

* UNTIL 1130 PM CDT

* AT 729 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
  RADAR ESTIMATED RAINFALL FROM 2 TO 3 INCHES HAS FALLEN ACROSS 
  PORTIONS OF NORTHERN DAVISON COUNTY NORTH AND WEST OF MITCHELL...
  AND TRAINING THUNDERSTORMS WILL MOVE INTO ADJACENT AREAS OF
  SANBORN...MINER...AND HANSON COUNTIES THROUGH 830 PM CDT.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MITCHELL AND LOOMIS.  DRY RUN AND FIRESTEEL CREEK NEAR LAKE
  MITCHELL CAN EXPECT FLASH FLOODING.

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.

&&

LAT...LON 4397 9785 4398 9756 4386 9763 4371 9798
      4371 9825 4386 9813

$$



CHAPMAN
3 follow-up statements
263 
WGUS73 KFSD 060333
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1033 PM CDT SAT MAY 5 2012

SDC035-061-097-111-060430-
/O.CON.KFSD.FF.W.0007.000000T0000Z-120506T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANBORN SD-MINER SD-HANSON SD-DAVISON SD-
1033 PM CDT SAT MAY 5 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN DAVISON...
NORTHWESTERN HANSON...SOUTHWESTERN MINER AND SOUTHEASTERN SANBORN
COUNTIES UNTIL 1130 PM CDT...

AT 1029 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
DOPPLER RADAR ESTIMATED FROM TWO TO FIVE INCHES RAINFALL SINCE 
EARLY EVENING IN AREAS FROM NEAR LOOMIS TO SOUTHEASTERN SANBORN
AND SOUTHWESTERN MINER COUNTIES. ADDITIONAL THUNDERSTORMS WERE 
DEVELOPING WITH PERIODS OF ADDITIONAL BRIEF HEAVY RAINFALL LIKELY 
THROUGH 1130 PM.

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...MITCHELL AND LOOMIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4397 9785 4398 9756 4386 9763 4371 9798
      4371 9825 4386 9813

$$
CHAPMAN
001 
WGUS53 KFSD 060414
FFWFSD
SDC035-061-097-111-060830-
/O.EXT.KFSD.FF.W.0007.000000T0000Z-120506T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1114 PM CDT SAT MAY 5 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHERN DAVISON COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHWESTERN HANSON COUNTY IN SOUTHEAST SOUTH DAKOTA
  SOUTHEASTERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA
  SOUTHWESTERN MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA

* UNTIL 330 AM CDT

* AT 1110 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL CONTINUING TO DEVELOP
  ACROSS THE WARNED AREA. ADDITIONAL STORMS DEVELOPING BACK TO THE
  SOUTHWEST INTO NORTHERN NEBRASKA WILL BE MOVING ACROSS THE AREA
  THROUGH AT LEAST 200 AM CDT.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MITCHELL AND LOOMIS.

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.

&&

LAT...LON 4397 9785 4398 9756 4386 9763 4371 9798
      4371 9825 4386 9813

$$

CHAPMAN
136 
WGUS73 KFSD 060806
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
306 AM CDT SUN MAY 6 2012

SDC035-061-097-111-060820-
/O.CAN.KFSD.FF.W.0007.000000T0000Z-120506T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANBORN SD-MINER SD-HANSON SD-DAVISON SD-
306 AM CDT SUN MAY 6 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHERN DAVISON...
NORTHWESTERN HANSON...SOUTHWESTERN MINER AND SOUTHEASTERN SANBORN
COUNTIES IS CANCELLED...

THUNDERSTORMS WITH HEAVY RAIN HAVE MOVED OUT OF THE AREA AND FLASH 
FLOODING IS NO LONGER EXPECTED. HOWEVER...FLOODING NEAR RIVERS AND 
STREAMS AND LOW LYING AREAS IS STILL POSSIBLE FROM RUNOFF.


LAT...LON 4397 9785 4398 9756 4386 9763 4371 9798
      4371 9825 4386 9813

$$

CJ

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 5, 7:05 PM CDTSevere Thunderstorm WarningFSDDavison, Hanson, McCook, Miner25 min
May 5, 7:29 PM CDTSevere Thunderstorm WarningFSDDavison, Hanson, Lake, McCook, Miner, Sanborn46 min
May 5, 7:30 PM CDTSevere Thunderstorm WarningFSDBrookings, Kingsbury, Miner, Sanborn45 min
May 5, 7:41 PM CDTSevere Thunderstorm WarningFSDBeadle, Kingsbury36 min
May 5, 7:59 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory46 min
May 5, 8:11 PM CDTSevere Thunderstorm WarningFSDDavison, Hanson, Lake, McCook, Miner, Minnehaha and 1 more49 min
May 5, 8:16 PM CDTSevere Thunderstorm WarningFSDBrookings, Kingsbury29 min
May 5, 8:42 PM CDTSevere Thunderstorm WarningFSDBrookings, Kingsbury48 min
May 5, 8:46 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix44 min
May 5, 8:57 PM CDTSevere Thunderstorm WarningFSDBrookings, Hanson, Lake, McCook, Miner, Minnehaha and 1 more48 min
May 5, 9:05 PM CDTSevere Thunderstorm WarningFSDBeadle, Kingsbury, Miner, Sanborn25 min
May 5, 9:07 PM CDTFlash Flood WarningFSDLake, Miner7 hr
May 5, 9:26 PM CDTSevere Thunderstorm WarningFSDKingsbury, Miner, Sanborn23 min
May 5, 9:27 PM CDTSevere Thunderstorm WarningFSDAurora, Brule28 min
May 5, 9:29 PM CDTSevere Thunderstorm WarningFSDBrookings46 min
May 5, 9:42 PM CDTSevere Thunderstorm WarningFSDLake, McCook, Minnehaha, Moody48 min
May 5, 10:02 PM CDTSevere Thunderstorm WarningFSDKingsbury, Miner, Sanborn28 min
May 5, 10:07 PM CDTSevere Thunderstorm WarningFSDBrookings38 min
May 5, 10:15 PM CDTFlash Flood WarningFSDMoody4 hr
May 5, 10:28 PM CDTSevere Thunderstorm WarningFSDLake, Minnehaha, Moody62 min
May 5, 10:31 PM CDTSevere Thunderstorm WarningFSDBrookings, Lake, Miner29 min
May 5, 10:57 PM CDTSevere Thunderstorm WarningFSDBrookings, Lake33 min
May 5, 11:08 PM CDTSevere Thunderstorm WarningFSDHanson, Lake, McCook, Miner37 min
May 5, 11:25 PM CDTSevere Thunderstorm WarningFSDBrookings, Lake, Moody65 min
May 5, 11:45 PM CDTSevere Thunderstorm WarningFSDLake, McCook, Miner, Minnehaha45 min
May 6, 12:22 AM CDTSevere Thunderstorm WarningFSDLake, McCook, Minnehaha, Moody38 min
May 6, 1:08 AM CDTAreal Flood WarningFSDBrookings, Hanson, Kingsbury, Lake, McCook, Miner and 2 more33 hr
May 6, 4:08 AM CDTRiver Flood WarningFSDMoody23 hr
May 6, 4:45 AM CDTRiver Flood WarningFSDBrookings, Moody29 hr
May 6, 4:45 AM CDTRiver Flood WarningFSDMinnehaha, Moody3 days
May 6, 4:45 AM CDTRiver Flood WarningFSDMinnehaha4 days
May 6, 4:45 AM CDTRiver Flood WarningFSDLincoln, Minnehaha4 days
May 6, 4:45 AM CDTRiver Flood WarningFSDLincoln, Union7 days
May 6, 4:45 AM CDTRiver Flood WarningFSDUnion7 days
May 6, 8:24 AM CDTRiver Flood WarningFSDMcCook4 days
May 6, 10:31 AM CDTRiver Flood WarningFSDDavison, Hanson7 days
May 6, 10:31 AM CDTRiver Flood WarningFSDHutchinson, Yankton5 days
May 6, 10:31 AM CDTRiver Flood WarningFSDYankton44 hr
May 6, 10:31 AM CDTRiver Flood WarningFSDTurner71 hr
May 6, 10:31 AM CDTRiver Flood WarningFSDTurner5 days
May 6, 10:31 AM CDTRiver Flood WarningFSDClay7 days
May 6, 6:58 PM CDTRiver Flood WarningFSDMinnehaha3 days

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.