The Estevan Fire Department is cautioning residents to prepare for a winter storm that's expected to wreak havoc on much of the Prairies over the next few days.

"Do not plan to travel," the department said in a Facebook post. "Fire crews may not be able to respond to emergencies for an extended period of time. Once this storm hits, do not travel."

Environment Canada is forecasting that this could be the worst storm in decades, with 30-50 centimetres of snow accumulation expected from Tuesday to Friday, with gale force winds causing blowing snow.

"It's a one in 30-years spring snow storm that will impact southeast Saskatchewan," said the fire department. It's important to be prepared by ensuring you have ample supply of your medication, food, and water requirements, money for incidentals, and fuelling up your vehicle."

Environment Canada said highway closures are likely, and travel within communities is expected to be difficult.

The city is asking residents to stay off the roadways.

"We're cautiously optimistic that hopefully it will miss us. In case it doesn't, we're asking residents to get ready," said Estevan Mayor Roy Ludwig. "Maybe have a few things around home if you have to stay inside for a couple days...get ready to hunker down. Hopefully we don't have to, but again, we all should be ready just in case."