Elk Point, South Dakota

The NWS Storm Prediction Center has issued a
Severe Thunderstorm Watch for portions of

       western Iowa
       southwest Minnesota
       northeast Nebraska
       southeast South Dakota

Effective this Thursday night and Friday morning from 705 PM
until 200 am CDT.

Hail to 3 inches in diameter... thunderstorm wind gusts to 70
mph... and dangerous lightning are possible in these areas.

The Severe Thunderstorm Watch area is approximately along and 95
statute miles east and west of a line from 25 miles west
northwest of Worthington Minnesota to 15 miles south southwest of
Tekamah Nebraska. For a complete depiction of the watch see the
associated watch outline update (wous64 kwns wou8).

Remember... a Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings. Severe thunderstorms can and occasionally
do produce tornadoes.

Discussion... cu/tcu field and scattered thunderstorms are beginning
to increase over northeast neb/southeast SD... and will likely track
eastward into IA through the evening. Other storms may redevelop
through the evening over this same area as low level jet increases.
Strong instability and 50-60 knots of effective shear will promote
supercells capable of very large hail and damaging winds.

Aviation... a few severe thunderstorms with hail surface and aloft
to 3 inches. Extreme turbulence and surface wind gusts to 60
knots. A few cumulonimbi with maximum tops to 500. Mean storm
motion vector 27030.


... Hart

... Flash Flood Watch remains in effect through Friday morning...

The Flash Flood Watch continues for

* portions of northwest Iowa... northeast Nebraska and southeast
South Dakota... including the following areas... in northwest
Iowa... Buena Vista... Cherokee... Clay... Dickinson... Ida...
Lyon... Obrien... Osceola... Plymouth... Sioux and Woodbury. In
northeast Nebraska... Dakota and Dixon. In southeast South
Dakota... Clay... Lincoln... Union and Yankton.

* Through Friday morning

* locally heavy rainfall of 1 to 3 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 3 to 10 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.

07/09/2009 0841 am

1 miles NW of North Sioux card, Union County.

Thunderstorm wind gust e60.00 mph, reported by trained spotter.


            Estimated 60 mph winds




07/09/2009 0841 am

1 miles NW of North Sioux c, Union County.

Thunderstorm wind gust e60 mph, reported by trained spotter.


            Estimated 60 mph winds





07/07/2009 0915 PM

4 miles S of Alcester, Union County.

Hail e1.00 inch, reported by public.


            1 inch hail in very heavy rain

... Sioux Falls climate data up to 530 PM CDT...

high temperature so far today... . 79
low temperature so far today... . 64
precipitation since midnight... .. 0.23


... Huron climate data up to 530 PM CDT...

high temperature so far today... . 84
low temperature so far today... . 68
precipitation since midnight... .. 0.43


... Sioux City climate data up to 530 PM CDT...

high temperature so far today... . 82
low temperature so far today... . 65
precipitation since midnight... .. 1.14
Missouri River stage... ... ... ... . 17.87

$$