RIVER levels in Llanymynech are expect to peak on Thursday afternoon.
The Environment Agency issued a flood alert for the Severn Vyrnwy confluence on Wednesday ahead of expected heavy rainfall overnight.
A peak of 3.2m to 3.7m is expected.
A spokesperson said: "Flooding of roads and farmland is expected between 9am and 12pm today, December 30.
"We expect flooding to affect low lying land and roads adjacent to the river from the Welsh border at Llawnt to Shrawardine near Shrewsbury. Other locations that may be affected include Llanymynech, Maesbrook and Melverley."
They added: "Further rainfall is forecast over the next few days. We are closely monitoring the situation.
"Please avoid using low lying footpaths near local watercourses and plan driving routes to avoid low lying roads near rivers, which may be flooded."
An update is expected on Friday morning.
Meanwhile, a flood alert has also been issued by Natural Resources Wales for the River Vyrnwy, River Tanat and River Cain and their tributaries.
A peak at Meifod is expected this morning 2.37m, while NRW was predicting a peak of between 3.65m and 3.95m at Llanymynech this afternoon.
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