Alert archive / Iowa / Flash Flood Watches in 2008

Flash Flood Watch 5, NWS Sioux Falls, SD

June 10, 200810 counties in Iowa; Cottonwood County, Jackson County, Nobles County, Minnesota

NWS Sioux Falls, SD issued this flash flood watch at Jun 10, 2008, 3:46 PM CDT for 10 counties in Iowa; Cottonwood County, Jackson County, Nobles County, Minnesota. It took effect at Jun 11, 2008, 8:00 AM CDT. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Jun 10, 2008, 3:46 PM CDT (20:46 UTC)
In effect from: Jun 11, 2008, 8:00 AM CDT
Expired: Jun 12, 2008, 1:49 AM CDT
In force: 18 hr
Issued by: NWS Sioux Falls, SD
Flood severity: None

Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 108 km from the middle of the area, began a volume at 20:48 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

Minneapolis, MN (KMPX), launched 12:00Z, 8.8 hours before the alert went out and 250 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1151 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 10, 3:13 PM CDT, 33 minutes earlier.

Area forecast discussion, Jun 10, 3:13 PM CDT, 33 minutes before

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Hazardous weather outlook, Jun 10, 3:00 PM CDT, 46 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
300 PM CDT TUE JUN 10 2008

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-111200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
300 PM CDT TUE JUN 10 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
THUNDERSTORMS ARE LIKELY TO DEVELOP AFTER MIDNIGHT TONIGHT ACROSS
THE AREA...WITH THE BEST CHANCES FOR THUNDERSTORMS NORTH OF
INTERSTATE 90. SOME OF THESE STORMS MAY BECOME SEVERE PRODUCING HAIL
TO THE SIZE OF QUARTERS.

FLOODING...
MINOR TO MODERATE FLOODING IS EXPECTED ALONG PORTIONS OF THE
VERMILLION...JAMES...LITTLE SIOUX...AND LOWER BIG SIOUX RIVERS
DURING THE NEXT FEW DAYS. THE FLOODING IS EXPECTED TO GENERALLY
SUBSIDE SLOWLY EXCEPT FOR SOME ADDITIONAL INCREASE ON THE LOWER
LITTLE SIOUX RIVER. HOWEVER...ADDITIONAL RAINFALL IS POSSIBLE
TONIGHT INTO THURSDAY...AND THIS COULD AFFECT THE RIVERS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THUNDERSTORMS ARE EXPECTED WEDNESDAY AND WEDNESDAY NIGHT AS LOW
PRESSURE MOVES EAST ACROSS THE AREA. SOME OF THESE STORMS COULD
BECOME SEVERE AND PRODUCE HEAVY RAIN. THE MAIN THREAT FOR SEVERE
STORMS AND HEAVY RAIN IS MAINLY EXPECTED ALONG AND EAST OF
INTERSTATE 29.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER MIDNIGHT.

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

LIEBL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 7:21 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	24 min

Nearby

Flash Flood Watches in Iowa, 2008 Flash Flood Watches in Minnesota, 2008 Every flash flood watch in 2008

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.