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Reston, Man., has declared a state of emergency after heavy rain Friday night caused flooding in town. (Jillian Coubrough/CBC)

The province issued an overland flood warning and high water advisory for many parts of Manitoba on Sunday as areas got pounded with rain.

A slow-moving low pressure system moved across the west into the Interlake region, bringing heavy rain and thunderstorms.

Environment Canada forecast local amounts as high as 75 millimetres for parts of the southwest by Monday morning, but some areas may have exceeded that by Sunday afternoon.

The Plumas-Gladstone-Woodside area reportedly received about 150 millimetres by Sunday at 4 p.m. CT.

The province said that if the heavy rains fall as forecast, small streams and tributaries would rise quickly and likely spill their banks.

It said flash or overland flooding is possible in the northwest, interlake and southwest regions of Manitoba

The RM of Pipestone is already under a state of emergency because of heavy rain Friday night. Roughly 400 of the 600 residents in Reston have been affected by flooding.

Flood preparations are also underway in The Pas and Opaskwayak Cree Nation because of high water coming down the Saskatchewan River from Alberta.

There is no rainfall warning for Winnipeg, but the city is expected to get between 10 to 15 millimetres of rain on Sunday.

Areas included in the warning

  • Swan River
  • Duck Mountain
  • Porcupine Provincial Forest
  • Dauphin
  • Roblin
  • Winnipegosis
  • Grand Rapids
  • Minnedosa
  • Neepawa
  • Russell
  • Riding Mountain National Park
  • Ste. Rose
  • McCreary
  • Alonsa
  • Gladstone