Four things you need to know about Friday, August 29

Friday, August 29, 2014, 8:40 AM - Wondering what you missed overnight or what you can expect for the day ahead? 

Here's your weather briefing for Friday, August 29. 

1. Cristobal collides with cold front

Cristobal is expected to stay out at sea, but cool, wet weather is forecast as the storm merges with a cold front.

"Hurricane Cristobal is racing east-northeastward toward the Southeastern Grand Banks under the influence of a cold frontal trough sweeping southeastward across Newfoundland this morning," said the Canadian Hurricane Centre in a statement early Friday. "The interaction between Cristobal and this trough could result in locally heavy rainfall accumulations over parts of Southeastern Newfoundland today."

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Gusty northerly winds are expected to develop across much of Atlantic Canada with wind gusts up to 80 km/h expected over eastern Newfoundland.

"These winds will not technically be related to Cristobal but will be part of the combined area of low pressure," says the CHC.

It will be a similar situation with rainfall across the region with variable amounts expected.

"The highest total amounts will be over Southeastern Newfoundland where some areas could see locally up to 50 to 70 millimetres due to embedded downpours."

In addition to the rain and wind, moderate to heavy surf is likely along the southern coastlines of Newfoundland Saturday.

The airmass in the wake of this system will be distinctively cooler and fall-like, the CHC adds.

2. Heat and humidity begin to build into Ontario

"Friday will be the last day of humidity free air as a strong southwesterly flow kicks in ushering in a sustained period of unsettled and humid conditions," says Weather Network meteorologist Tyler Hamilton. 

Saturday will be much like Tuesday across southern Ontario with a gusty southwest wind, temperatures near 30°C and a humidex that will approach 40.

"A complex system approaches the Great Lakes on Saturday and Sunday," Hamilton says. "As energy moves in from the U.S. it will create heavier rainfall over northern Ontario and the risk of thunderstorms to most of southern Ontario for Saturday and Sunday."

Environment Canada issued a special weather statement for parts of northern Ontario warning of significant rain through Saturday.

"A rainfall warning has been issued for regions including Searchmont and Agawa due to high rainfall amounts expected," EC says.

Local amounts of 40 to 80 mm are possible by Saturday, especially if thunderstorms occur.

3. Severe storms batter the Prairies

Severe thunderstorms picked up across the Prairie provinces Thursday night, with strong winds/large hail being the main severe risks.

A train derailment was reported in southeastern Saskatchewan at about 7:30 pm eastern time, but police officials could not confirm if strong winds at the time were the cause of the derailment.

Mounties did say a storm blew through the area about the same time as the cars derailed.

Train derailment byWaldeck#Saskatchewan tonight after one of the worst storms passes through @liewicks@MJTimesHerald pic.twitter.com/8vHNHcx8mu

— Liliane Weiterman (@scubalil) August 29, 2014

4. Below seasonal temps and heavy rain on tap in B.C. 

"An upper level low dropping down from Alaska this weekend will produce below seasonal temperatures for the long weekend," Hamilton says. "A series of short wave troughs will also impact the coast." 

Hamilton says that combined with the Pacific Ocean will produce heavy rainfall for the central coast of B.C.

Upwards of 100 mm of rain is forecast in the hardest hit places.