Alert archive / Iowa / Flash Flood Watches in 2010
Flash Flood Watch 10, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood watch at Aug 8, 2010, 1:14 PM CDT for 7 counties in South Dakota; 11 counties in Iowa; Rock County, Minnesota. It took effect at Aug 8, 2010, 7:00 PM CDT. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 8, 2010, 1:14 PM CDT (18:14 UTC)
- In effect from
- Aug 8, 2010, 7:00 PM CDT
- Expired
- Aug 8, 2010, 9:41 PM CDT
- In force
- 3 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, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Rock County, MN, Bon Homme County, SD, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 72 km from the middle of the area, began a volume at 18:15 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
Omaha, NE (KOAX), launched 12:00Z, 6.2 hours before the alert went out and 193 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
- 2728 J/kg
- Mixed-layer CIN
- -172 J/kg
- Mixed-layer LCL
- 1079 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 266 m²/s²
- 0-3 km storm-relative helicity
- 308 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.9
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 Aug 8, 10:35 AM CDT, 2 hours 39 minutes earlier.
Area forecast discussion, Aug 8, 10:35 AM CDT, 2 hours 39 minutes before
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</html>Hazardous weather outlook, Aug 8, 11:14 AM CDT, 2 hours before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1114 AM CDT SUN AUG 08 2010 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-091200- 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- 1114 AM CDT SUN AUG 08 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... SCATTERED THUNDERSTORMS ARE POSSIBLE LATE THIS AFTERNOON WEST OF INTERSTATE 29 AND NORTH OF INTERSTATE 90...AND THEN MERGE INTO A LARGE AREA OF THUNDERSTORMS MAINLY FROM SOUTHEAST SOUTH DAKOTA TO NORTHWEST IOWA THIS EVENING. LOCALLY DAMAGING WINDS AND LARGE HAIL WILL BE POSSIBLE...BUT THE MAIN THREAT FROM THESE THUNDERSTORMS WILL BE VERY HEAVY RAIN WITH 1 TO 3 INCHES RAINFALL POSSIBLY CAUSING LOCAL FLASH FLOODING THIS EVENING AND OVERNIGHT. FLOODING... RIVER FLOODING WILL CONTINUE ALONG THE JAMES RIVER FOR AN EXTENDED PERIOD. RIVER FLOODING IS ALSO OCCURRING OVER PARTS OF THE VERMILLION RIVER. WITH NO ADDITIONAL RAINFALL THE VERMILLION RIVER WILL CONTINUE TO SLOWLY FALL OVER THE NEXT FEW DAYS. EXCESSIVE TEMPERATURES... IT WILL BE HOT AND HUMID THIS AFTERNOON FROM SOUTHEAST SOUTH DAKOTA TO NORTHWEST IOWA AND FAR NORTHEAST NEBRASKA. HIGHEST HEAT INDICES THIS AFTERNOON SHOULD BE FROM 100 TO 110 IN THE LOWER JAMES VALLEY OF SOUTH DAKOTA TO NORTHWEST IOWA...AND 95 TO 100 ELSEWHERE IN THE AREA. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY VERY WARM AND HUMID AIR WILL CONTINUE TO CAUSE UNCOMFORTABLE CONDITIONS MONDAY AFTERNOON THROUGH TUESDAY...ESPECIALLY SOUTH OF INTERSTATE 90. AFTERNOON HEAT INDICES WILL GENERALLY RANGE FROM AROUND 105 SOUTH TO 95 NORTH ACROSS THE FORECAST AREA. IN ADDITION...SCATTERED THUNDERSTORMS WITH LOCALLY HEAVY RAINS WILL AGAIN BE POSSIBLE MONDAY NIGHT AND EARLY TUESDAY IN THE AREA...ESPECIALLY ALONG AND NORTH OF INTERSTATE 90. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 4PM && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 4:16 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix, Douglas, Hutchinson | 44 min |
| Aug 8, 4:33 PM CDT | Flash Flood Warning | FSD | Bon Homme, Charles Mix, Hutchinson | 3 hr |
| Aug 8, 4:54 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Yankton | 51 min |
| Aug 8, 5:08 PM CDT | Flash Flood Warning | FSD | Clay, Hutchinson, Turner, Yankton | 4 hr |
| Aug 8, 5:32 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Hutchinson, Turner, Yankton | 43 min |
| Aug 8, 5:56 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln, Turner, Union | 34 min |
| Aug 8, 6:40 PM CDT | Severe Thunderstorm Warning | FSD | Union | 65 min |
Nearby
Flash Flood Watches in Iowa, 2010Flash Flood Watches in South Dakota, 2010Flash Flood Watches in Minnesota, 2010Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.