Alert archive / Iowa / Flash Flood Watches in 2010
Flash Flood Watch 9, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood watch at Aug 1, 2010, 9:30 PM CDT for 7 counties in South Dakota; 8 counties in Iowa. It took effect at Aug 2, 2010, 4:00 AM CDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Aug 1, 2010, 9:30 PM CDT (02:30 UTC)
- In effect from
- Aug 2, 2010, 4:00 AM CDT
- Expired
- Aug 2, 2010, 11:36 AM CDT
- In force
- 8 hr
- Issued by
- NWS Sioux Falls, SD
- Flood severity
- None
Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Ida County, IA, O'Brien County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Bon Homme County, SD, Clay County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 78 km from the middle of the area, began a volume at 02:30 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 00:00Z, 2.5 hours before the alert went out and 310 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
- 1046 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1149 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 256 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.1
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 1, 2:56 PM CDT, 6 hours 34 minutes earlier.
Area forecast discussion, Aug 1, 2:56 PM CDT, 6 hours 34 minutes before
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</html>Hazardous weather outlook, Aug 1, 11:09 AM CDT, 10 hours 21 minutes before
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</html>The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 8:21 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 39 min |
| Aug 1, 10:43 PM CDT | Areal Flood Warning | FSD | Jerauld, Sanborn | 30 hr |
| Aug 2, 6:35 AM CDT | Flash Flood Warning | FSD | Lincoln, Minnehaha, Turner | 3 hr |
| Aug 2, 6:47 AM CDT | Flash Flood Warning | FSD | Bon Homme, Charles Mix, Douglas, Hutchinson | 3 hr |
| Aug 2, 7:03 AM CDT | Flash Flood Warning | FSD | Nobles, Rock | 3 hr |
Nearby
Flash Flood Watches in Iowa, 2010Flash Flood Watches in South Dakota, 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.