Alert archive / South Dakota / Flash Flood Watches in 2010

Flash Flood Watch 3, NWS Sioux Falls, SD

June 11, 201018 counties in South Dakota; 11 counties in Iowa

NWS Sioux Falls, SD issued this flash flood watch at Jun 11, 2010, 3:31 PM CDT for 18 counties in South Dakota; 11 counties in Iowa. It took effect at Jun 12, 2010, 1:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jun 11, 2010, 3:31 PM CDT (20:31 UTC)
In effect from: Jun 12, 2010, 1:00 AM CDT
Expired: Jun 12, 2010, 9:23 AM CDT
In force: 8 hr
Issued by: NWS Sioux Falls, SD
Flood severity: None

All 29 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 45 km from the middle of the area, began a volume at 20:37 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 forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this flash flood watch went out at Jun 11, 7:00 AM CDT, 8 hours 31 minutes earlier.

Area forecast discussion, Jun 11, 7:00 AM CDT, 8 hours 31 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
700 AM CDT FRI JUN 11 2010

.UPDATE...
RAIN HAS PUSHED EAST OF I-29 CORRIDOR AND SHOULD EXIT EASTERN PARTS
OF THE CWA BY 15Z. CANCELLED REMAINDER OF THE SEVERE THUNDERSTORM
WATCH...AS WELL AS WESTERN PORTIONS OF THE FLASH FLOOD WATCH EARLY.
SOME ADJUSTMENTS TO TIMING OF FLASH FLOOD WATCH EAST OF A YANKTON TO
SIOUX FALLS LINE TO COVER POTENTIAL FOR LOCALLY HEAVY RAIN IN SERN
PARTS OF THE CWA THROUGH THIS EVENING. UPDATED GRIDS AND ZFP HAVE
BEEN SENT.

&&

.DISCUSSION...
WELL DEFINED BOW ECHO PRODUCING REPORTS OF 65-75 MPH WINDS SHOULD BE
EXITING EASTERN PARTS OF THE AREA IN THE NEXT HOUR OR SO. BROAD AREA
OF MORE STRATIFORM RAIN WITH SOME EMBEDDED THUNDER EXTENDING OVER
THE REMAINDER OF THE CWA AS OF 09Z...WITH BACK EDGE LIFTING
NORTHEAST THROUGH EASTERN NEBRASKA AS WEAK WAVE MOVES THROUGH
SOUTHWEST FLOW ALOFT. EXPECT MUCH OF THIS ACTIVITY TO EXIT TO THE
EAST BY MID-LATE MORNING...AND TOUGH TO TELL WHERE LINGERING OUTFLOW
BOUNDARIES WILL SET UP FOR THE AFTERNOON...BUT BEST CONSENSUS FROM
MODELS PLACE THE MAIN BOUNDARY NEAR A KYKN-KFSD-KMML LINE BY LATE
AFTERNOON...PUSHING SOUTHEAST INTO NORTHWEST IOWA DURING THE EARLY
EVENING. ABILITY FOR CONVECTION TO REFIRE THIS AFTERNOON WILL DEPEND
TO SOME DEGREE ON EXTENT OF CLEARING/HEATING OUT ALONG AND AHEAD OF
THE BOUNDARY...THOUGH AIRMASS EXPECTED TO BE QUITE JUICY WITH LOWER
70S DEW POINTS LIKELY INTO NORTHWEST IOWA THIS AFTERNOON. HAVE
PUSHED BACK TIMING OF REDEVELOPMENT TO LATE AFTERNOON TO ALLOW A
LITTLE MORE TIME FOR HEATING/DESTABILIZATION...WITH GREATER CHANCE
OVER NORTHWEST IOWA THIS EVENING AS ANOTHER WEAK WAVE LIFTS
NORTHEAST ACROSS THE BOUNDARY. HAVE CONTINUED FLASH FLOOD WATCHES
FOR NOW...BUT WILL LIKELY BE ABLE TO CANCEL SOUTH DAKOTA COUNTIES A
FEW HOURS EARLY AS RAIN BEGINS TO LIFT OUT OF THE AREA PRIOR TO 12Z.
WILL CONTINUE FLASH FLOOD WATCH FOR NWRN IA/SWRN MN TO COVER
POSSIBLE REDEVELOPMENT IN THE AFTERNOON...AS DEEP MOISTURE WILL
AGAIN BRING POTENTIAL FOR LOCALLY HEAVY RAINFALL.

LITTLE CHANGE TO REMAINDER OF THE FORECAST SATURDAY THROUGH TUESDAY.
PERIODIC RAIN CHANCES AS WEAK WAVES MOVE OUT OF THE MAIN TROUGH THRU
SATURDAY NIGHT...FOLLOWED BY SOME UPPER RIDGING WHICH SHOULD KEEP
THE LATTER HALF OF THE WEEKEND DRY MOST AREAS. MAIN TROUGH EXPECTED
TO LIFT NORTHEAST INTO THE NORTHERN PLAINS EARLY NEXT WEEK...AND
WILL STICK WITH HIGH CHANCE POPS FOR NOW LATE SUNDAY NIGHT THROUGH
MONDAY NIGHT.

&&

.AVIATION...
MVFR-LOCALLY IFR CIGS WITH BROAD AREA OF RAIN/TSRA EXPECTED TO
GRADUALLY LIFT INTO VFR RANGE AS UPPER WAVE LIFTS NORTHEAST AND
PUSHES RAIN EAST OF THE AREA BY 15Z. POTENTIAL FOR ADDITIONAL TSRA
ALONG/EAST OF A KYKN-KFSD-KMML LINE DEVELOPING MID-LATE AFTERNOON AS
ANOTHER UPPER WAVE LIFTS NORTHEAST ALONG LINGERING LOW LEVEL FRONT
ACROSS THE AREA. PERIODS OF MVFR-LOCALLY IFR CIGS/VSBYS WILL AGAIN
BE POSSIBLE WITH ANY TSRA LATE THIS AFTERNOON/TONIGHT...WITH
GREATEST CHANCE SOUTH OF I-90.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
IA...FLASH FLOOD WATCH THROUGH MIDNIGHT FOR
     IAZ001>003-012>014-020>022-031-032.

MN...FLASH FLOOD WATCH THROUGH MIDNIGHT FOR MNZ089-090-098.

NE...FLASH FLOOD WATCH THROUGH MIDNIGHT FOR NEZ013-014.

SD...FLASH FLOOD WATCH THROUGH MIDNIGHT FOR SDZ062-066-067-069>071.

&&

 JH

Hazardous weather outlook, Jun 11, 10:59 AM CDT, 4 hours 32 minutes before

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In the hours before

Local storm report, Jun 11, 10:12 AM CDT, 5 hours 19 minutes before

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Local storm report, Jun 11, 11:13 AM CDT, 4 hours 18 minutes before

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Local storm report, Jun 11, 11:16 AM CDT, 4 hours 15 minutes before

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Local storm report, Jun 11, 11:19 AM CDT, 4 hours 12 minutes before

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Local storm report, Jun 11, 12:37 PM CDT, 2 hours 54 minutes before

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Local storm report, Jun 11, 2:44 PM CDT, 47 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 11:56 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Douglas, Sanborn	49 min
Jun 11, 12:19 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas, Hanson, Hutchinson, Sanborn	41 min
Jun 11, 12:26 AM CDT	Flash Flood Warning	FSD	Aurora, Jerauld, Sanborn	3 hr
Jun 11, 12:49 AM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Hutchinson, McCook, Turner	41 min
Jun 11, 1:20 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson, McCook, Turner, Yankton	40 min
Jun 11, 1:23 AM CDT	Flash Flood Warning	FSD	Davison, Hanson, McCook, Miner, Sanborn	3 hr
Jun 11, 1:31 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, Lake, McCook, Miner	44 min
Jun 11, 1:50 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Clay, Yankton	40 min
Jun 11, 1:51 AM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Lincoln, McCook, Minnehaha, Turner, Yankton	39 min
Jun 11, 1:58 AM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Miner, Minnehaha, Moody	47 min
Jun 11, 2:15 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	30 min
Jun 11, 2:24 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha, Turner	51 min
Jun 11, 2:31 AM CDT	Severe Thunderstorm Warning	FSD	Lake, Moody	29 min
Jun 11, 2:36 AM CDT	Severe Thunderstorm Warning	FSD	Union	39 min
Jun 11, 2:39 AM CDT	Flash Flood Warning	FSD	Bon Homme, Clay, Hutchinson, Lincoln, Turner, Yankton	3 hr
Jun 11, 2:43 AM CDT	Flash Flood Warning	FSD	Lincoln, Minnehaha, Turner	3 hr
Jun 11, 2:55 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake, Minnehaha, Moody	50 min
Jun 11, 2:58 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	47 min
Jun 11, 3:17 AM CDT	Flash Flood Warning	FSD	Union	3 hr
Jun 11, 3:32 AM CDT	Flash Flood Warning	FSD	Brookings, Lake, Moody	3 hr
Jun 11, 3:39 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake, Moody	51 min
Jun 11, 5:56 AM CDT	Areal Flood Warning	FSD	Aurora, Bon Homme, Charles Mix, Davison, Douglas, Hanson and 5 more	12 hr
Jun 11, 9:31 AM CDT	River Flood Warning	FSD	McCook, Turner	6 days
Jun 11, 9:31 AM CDT	River Flood Warning	FSD	Lincoln, Turner	22 days
Jun 11, 9:31 AM CDT	River Flood Warning	FSD	Clay, Turner	22 days
Jun 11, 9:31 AM CDT	River Flood Warning	FSD	Davison	18 days
Jun 11, 10:03 AM CDT	River Flood Warning	FSD	Brookings, Moody	14 days
Jun 11, 10:03 AM CDT	River Flood Warning	FSD	Lincoln, Union	21 days
Jun 11, 10:03 AM CDT	River Flood Warning	FSD	Union	23 days
Jun 11, 3:14 AM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Ida, Plymouth, Sioux, Woodbury	46 min
Jun 11, 3:30 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	45 min
Jun 11, 3:56 AM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Cherokee, Clay, Ida, O'Brien	49 min
Jun 11, 3:57 AM CDT	Severe Thunderstorm Warning	FSD	Dickinson	48 min
Jun 11, 4:36 AM CDT	Flash Flood Warning	FSD	Clay, Dickinson	3 hr
Jun 11, 10:03 AM CDT	River Flood Warning	FSD	Clay, Dickinson	3 days
Jun 11, 10:03 AM CDT	River Flood Warning	FSD	Buena Vista	8 days
Jun 11, 10:29 AM CDT	River Flood Warning	FSD	Clay, O'Brien	23 hr

Nearby

Flash Flood Watches in South Dakota, 2010 Flash Flood Watches in Iowa, 2010 Every flash flood watch in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.