On its way to Manitoba, a storm has left destruction in its path.

In Vanguard, Saskatchewan, bridges have been swept away. Families have been forced to leave their homes. More than 300 millimetres of rain fell Thursday night, as it headed toward Manitoba.

Environment Canada is watching and waiting, concerned about what the rain will bring with it.

Meterologist Jay Andersen says "in a thunderstorm when the rain is falling, it brings the air down with it, and when it hits the ground, it can bring speeds high enough to take a roof off."

Rainfall between 100 and 150 millimetres will hit Manitoba. That follows two weeks of rain; which has left many fields loking like duck sanctuaries.

Farmer Mark Anseeuw has already lost part of his crops: now he'll likely lose more.

He says any more rain is going to cause "significant damage."

At the Forks, the Red River is already reaching over its banks. That's the result of flooding two weeks ago in North Dakota.

Rain will put more pressure on the rivers: but most will hold.

Steven Topping of Manitoba Conservation says in the Whiteshell area, "small creeks and the Seine River could overflow and cause flash flooding."

Most officials say: don't panic. Manitoba's storm will be bad, but not as severe as Saskatchewan's. And no one is too sure exactly how heavy the rain will be.