WINNIPEG – The humidex in southern Manitoba will climb above 40 this afternoon, Environment Canada warned after two communities set temperature records Monday.
A humidex higher than 40 can cause great discomfort and people should avoid exertion, Environment Canada says.
The humidex is a combined measure of humidity and temperature that reflects how hot the air feels, much the way windchill factors in wind to calculate how cold the air feels.
“An extremely high humidex reading can be defined as one that is over 40. In such conditions, all unnecessary activity should be curtailed,” the Environment Canada website says.
“If working outdoors is an absolute necessity, drink plenty of liquids and take frequent rest breaks.”
The communities of Fisher Branch and Island Lake set records on Monday for highest temperature reached on Aug. 26. Fisher Branch hit 32.7 C, beating the 1984 record of 32.5 C, and Island Lake reached 29.1 C, beating the 1972 record of 28.9 C.
A humidex advisory was issued at 4:30 a.m. for Winnipeg, Steinbach, St. Adolphe, Dominion City, Vita, Richer, Selkirk, Gimli, Stonewall, Woodlands, Eriksdale, Dugald, Beausejour, Grand Beach, Portage la Prairie, Headingley, Brunkild, Carman, Morden, Winkler, Altona, Emerson, Morris, Bissett, Nopiming Provincial Park, Pine Falls, the Whiteshell, Lac du Bonnet, Pinawa, Sprague, Northwest Angle Provincial Forest, Brandon, Carberry, Treherne, Killarney, Pilot Mound and Manitou.
The humidex in those places is expected to reach 40 or higher this afternoon.
Environment Canada also advises pet owners to make sure their animals are protected from the heat and have plenty to drink.
Extremely high humidex readings are rare in Canada, except in the southern regions of Ontario, Manitoba and Quebec, Environment Canada says.
© Shaw Media, 2013