Surfaces such as highways, roads, walkways and parking lots may become icy and slippery.
It is expected to be a messy Monday as a freezing rain warning is in effect for Ottawa, and periods of freezing drizzle will occur throughout the day.
The daytime high was 43 degrees warmer than Friday's high temperature - a remarkable increase for a 72-hour period. Accumulation of ice will likely damage trees and cause downed power lines leading to power outages.
We expect freezing rain to start moving into our West Zone around midnight.
Officials measured 20-40 mm of water in the existing snow pack last week, which is below normal for this time of year.
Sunny skies arrive Tuesday morning with a few afternoon clouds as high pressure moves into the region. Tempeartures will remain in the upper 20s to low 30s tomorrow afternoon ahead of a warm front.
For the Lehigh Valley, we'll just see a very rainy night with the highest rainfall amounts perhaps between a half and three quarters of an inch possible. Any standing water tonight is expected to freeze over.
And as the temperature hovers near 0 C, the chance of freezing rain is more likely.
Snowfall warnings are issued when significant snowfall is expected.