The Met Office has issued a yellow weather warning ahead of heavy rain predicted for Derry tomorrow.
Bands of heavy showers are expected to result in an an increased risk of both surface water or river flooding as well as some local disruption to transport.
The Northern Ireland Fire and Rescue Service is advising motorists not to chance driving through floods.
Group Commander Eddie Carroll said the biggest risk to the public and members of the emergency services was those people who drive into flood water, especially if it is fast-flowing.
He added, “We’d like to remind motorists that they should not attempt to drive through flooded roads or fords.
“The water is often deeper than it looks and may be moving quite fast. Your vehicle may be swept away or become stranded.
“Motorists should heed road closure or flood signs and find an alternative route. Leave extra time for your journey.
“Do not attempt to walk through flooded areas. Even shallow water moving fast can sweep you off your feet and there may be hidden dangers such as open drains, damaged road surfaces, submerged debris or deep channels; these can cause serious injuries or even death.
“Continue to keep an eye on weather reports on local TV/radio news channels. Do not travel in heavy rain storms unless absolutely necessary.
“If you do get stranded and there is a risk to life call 999.”
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