Flash Flood Watch in effect until 11 am CDT this morning...
Today
Mostly cloudy. Thunderstorms likely in the morning... then chance of thunderstorms in the afternoon. A few severe storms are possible...along with heavy rain. Highs in the upper 70s. Northeast winds 5 to 10 mph. Chance of rain 60 percent.
Mostly cloudy with a 20 percent chance of thunderstorms in the early evening...then mostly cloudy. Areas of fog late. Lows in the upper 50s. Northeast winds 5 to 10 mph.
Saturday
Partly sunny. Areas of fog in the early morning. A 20 percent chance of showers in the afternoon. Highs in the upper 70s. East winds around 5 mph becoming southeast in the afternoon.
The National Weather Service in Sioux Falls has issued a
* Flash Flood Warning for... northern Plymouth County in northwest Iowa southern Sioux County in northwest Iowa
* until 830 am CDT
* at 536 am CDT... National Weather Service Doppler radar indicated thunderstorms with very heavy rainfall along the Plymouth and Sioux County line. More thunderstorms are expected through 7 am CDT. Radar estimates 1 to 1.5 inches of rain has fallen since 430 am CDT with an additional 1 to 2 inches of rain likely.
* Runoff from this excessive rainfall will cause flash flooding to occur. Some locations that will experience flooding include... Maurice Orange City... Craig... and Struble.
Precautionary/preparedness actions...
Flooding is occurring or is imminent. Most flood related deaths occur in automobiles. Do not attempt to cross water covered bridges... dips... or low water crossings. Never try to cross a flowing stream... even a small one... on foot or in a vehicle.
... Flash Flood Watch now in effect until 11 am CDT this morning...
The Flash Flood Watch is now in effect for
* portions of northwest Iowa... northeast Nebraska and southeast South Dakota... including the following areas... in northwest Iowa... Buena Vista... Cherokee... Clay... Ida... Obrien... Plymouth... Sioux and Woodbury. In northeast Nebraska... Dakota and Dixon. In southeast South Dakota... Clay... Union and Yankton.
* Until 11 am CDT this morning
* additional locally heavy rainfall of 1 to 2 inches is possible tonight. Rainfall rates of 2 to 3 inches per hour are also possible... dropping an inch of rain or more in 15 to 30 minutes.
* Areas that have received heavy rains in the past few days could see flash flooding on creeks and streams with these additional rains... and any urbanized areas that receive the heaviest rainfall rates could see widespread flooding of streets and underpasses.
Precautionary/preparedness actions...
A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation.
You should monitor later forecasts and be prepared to take action should flash flood warnings be issued.
Local Storm Report
07/10/2009 0525 am
Ireton, Sioux County.
Hail m1.00 inch, reported by trained spotter.
07/09/2009 0710 PM
Rock Valley, Sioux County.
Hail e1.00 inch, reported by trained spotter.
07/09/2009 0715 PM
4 miles WSW of Rock Valley, Sioux County.
Hail e1.75 inch, reported by trained spotter.
Golfball sized hail was falling along with heavy rain and light winds.
07/09/2009 0723 PM
5 miles WSW of Hull, Sioux County.
Hail e1.75 inch, reported by trained spotter.
07/09/2009 0710 PM
Rock Valley, Sioux County.
Hail e1.00 inch, reported by trained spotter.
07/09/2009 0715 PM
4 miles WSW of Rock Valley, Sioux County.
Hail e1.75 inch, reported by trained spotter.
Golfball sized hail was falling along with heavy rain and light winds.
07/09/2009 0723 PM
5 miles WSW of Hull, Sioux County.
Hail e1.75 inch, reported by trained spotter.
07/09/2009 0742 PM
1 miles E of Boyden, Sioux County.
Hail e1.00 inch, reported by trained spotter.
07/09/2009 0742 PM
1 miles E of Boyden, Sioux County.
Hail e1.00 inch, reported by trained spotter.
07/09/2009 0723 PM
5 miles WSW of Hull, Sioux County.
Hail e1.75 inch, reported by trained spotter.
07/09/2009 0715 PM
4 miles WSW of Rock Valley, Sioux County.
Hail e1.75 inch, reported by trained spotter.
Golfball sized hail was falling along with heavy rain and light winds.