Temperatures across Ontario continue to drop as an arctic blast blankets most of the province in an extreme cold warning.

Environment Canada says it could feel like between -30 degrees Celsius and -40 degrees Celsius across much of southern and eastern Ontario this morning.

Biting wind chills make it feel colder than the actual temperature, with the weather agency warning that frostbite could quickly develop on exposed skin.

READ MORE: Cold weather alert reissued for Hamilton

Wind chill values are expected to let up slightly this afternoon, but return in full force for this evening and into Saturday morning.

The greatest risks are for young children, older adults, people with chronic illnesses, people working or exercising outdoors, and those without proper shelter.

The City of Hamilton issued a cold weather alert yesterday.

When a cold alert is issued, the city focuses on promoting access to safe and warm shelter to those on the street and for individuals living in vulnerable conditions with limited heat.

Hamilton has six emergency shelters and drop-in locations available for houseless community members:

• The Hub at 78 Vine St. has year-round drop-in hours from 5 p.m. to 9 p.m. and overnight drop-in hours 10 p.m. to 10 a.m. daily.
• Hamilton Regional Indian Centre at 407 King St. West is open Monday to Friday 8:30 a.m. to 6:30 p.m.
• YWCA Carol Anne’s Place at 75 MacNab Street has overnight drop-in hours from 10 p.m. to 9 a.m. daily for women and non-binary individuals.
• Mission Services Willow’s Place at 196 Wentworth St. North has drop-in hours from 9 a.m. to 8:30 p.m. daily for women.
• Wesley Day Centre at 52 Catharine St. North is open Monday to Friday 8:30 a.m. to 4 p.m.
• Living Rock Youth Resources at 30 Wilson St. has daily drop-in hours from 1 p.m. to 4 p.m. for youth.

This alert remains in effect until a cancellation notice is issued.

READ MORE: Hamilton’s medical officer of health issues cold weather alert

The Greater Toronto and Hamilton Area is receiving a forecast of near -30 degrees Celsius, while Ottawa is feeling closer to -40 degrees Celsius.

In Thunder Bay it will feel more like -45 degrees Celsius and the regions around Hudson Bay are forecasted to feel like around -50.

Environment Canada encourages residents to dress warmly, making use of layers and ensuring the outer layer of clothing is wind resistant.