After a wet weekend more rain is in the forecast for Monday night into Tuesday. In response the National Weather Service has issued a Flash Flood Watch for parts of South Dakota, Iowa, Minnesota and Nebraska.

The watch area includes Minnehaha County and the city of Sioux Falls.

The watch is in effect from 6:00 PM today (Monday October 2) through late tonight.

Scattered showers and thunderstorms will continue to develop
  this afternoon with more widespread showers and thunderstorms by
  this evening. Locally heavy rainfall...with amounts of 1 to 3
  inches are expected. Localized rainfall amounts of greater than
  3 inches may be possible.

* Impacts...Heavy rainfall will be capable of producing quick
  ponding of water on roads...low lying...or poor drainage areas.
  Flash flooding may occur during the nighttime hours and thus may
  make flooding difficult to observe.

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.

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