Up to 40 mm of rain could soak parts of foggy Ottawa-Gatineau area
All of eastern Ontario now has a fog advisory
UPDATE | The Ottawa International Airport got 14.1 millimetres of rain Tuesday and Wednesday. CFB Trenton measured 31 mm Monday through Wednesday. Daily amounts aren't immediately available in western Quebec.
A large amount of rain could fall on hard, frozen ground around the capital starting Tuesday evening.
Rainfall warnings for a broad swath of eastern Ontario and western Quebec bordered by Kingston, Sharbot Lake and Shawville called for up to 40 millimetres of rain by Wednesday night.
The Ottawa airport had 9.2 millimetres of rain by midnight and CFB Trenton had 15.6 mm.
Affected parts of eastern Ontario were forecast to get 10 to 15 more millimetres of rain as of about 4:45 a.m. Wednesday.
As of about 8:30 a.m. Wednesday, eastern Ontario's rainfall warning ended west of Ottawa and Brockville. It ended in Ottawa around 2 p.m.
Current ground conditions mean it's unlikely all that precipitation will be absorbed, then colder temperatures on Thursday could cause a freeze.
The temperature in Ottawa-Gatineau is forecast to peak at 3 C Wednesday before that drop. Thursday night could get to around –13 C.
An Ottawa roads manager told CBC Radio's Ottawa Morning on Tuesday residents should clear catch basins to help water drain, and to contact 311 if they need help.
South Nation Conservation, the authority for the South Nation River watershed area that includes parts of east Ottawa and communities such as Casselman, Embrun and Morrisburg, says there could be nuisance flooding in low-lying areas.
Unlike Tuesday, Environment Canada no longer said on Wednesday that people in western Quebec should consider changing non-essential travel plans.
Long-lasting fog advisory
There was also a fog advisory for all of eastern Ontario Wednesday morning and early afternoon, part of a slow expansion that started Tuesday morning around Kingston.
It had lifted in the westernmost parts of the region such as Belleville and Deep River by 2 p.m.
Freezing drizzle advisories had all lifted in eastern Ontario by mid-afternoon Tuesday after a sloppy Monday. There were some local freezing rain warnings Tuesday night, meaning Ottawa had three weather alerts at once.
English and French school buses in eastern Ontario ran Tuesday in Ottawa and Renfrew County, but buses under STEO, CTSE and Tri-Board were cancelled.
Renfrew County school buses are cancelled Wednesday.
With files from CBC Radio's Ottawa Morning