Alcester, South Dakota

Severe Thunderstorm Watch 568 remains in effect until 200 am CDT

SD
. South Dakota counties included are

Bon Homme Clay Hanson
Hutchinson Lincoln McCook
Minnehaha Turner Union
Yankton

... 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

... Severe Thunderstorm Watch safety rules...

A Severe Thunderstorm Watch means that conditions are favorable
for the development of severe weather in the designated area.
During a watch there is no cause for immediate concern. You should
go about your normal business... but be on the lookout and keep up
to date on the latest weather developments. Public safety
officials should activate prearranged plans.

A Severe Thunderstorm Warning... on the other hand... means that a
severe thunderstorm has been sighted or indicated by radar. People
in the path of the storm should take immediate action to safeguard
themselves and their family.

Technically speaking... a severe thunderstorm is defined as having
wind gusts which exceed 58 mph and/or hail at least 3/4 inch in
diameter. However... as these storms develop... they can be
accompanied by tornadoes. Listen to NOAA Weather Radio or other
local media to learn if a warning has been issued for your area.
Also... keep a close watch on the thunderstorms as tornadoes can
form quickly. If you see a tornado... move quickly into a basement.
If none is available... seek shelter in a small interior room on
the lowest floor and stay away from outside walls... doors and
windows. In schools... factories or other institutional type
buildings... stay out of auditoriums and gymnasiums.