Wednesday, 29 August 2012

The Heat is on

UPDATE 9:50 AM: HUMIDEX ADVISORY issued for all of southern Manitoba as humidex values are expected to reach or exceed 40 this afternoon.
     It will be a scorcher in Manitoba today as a low pressure system moving into northern Manitoba pumps very hot air from south of the border ahead of it. 850 mb temperatures are expected to rise into the mid to high twenties in southern Manitoba. This will bring the potential for highs in the mid to high thirties this afternoon. We will also have to contend with higher humidity for part of the day, before humidity levels drop off gradually later this afternoon and evening. There will be a stiff south wind this afternoon, perhaps providing a bit of relief to the heat.

     Due to the fact that winds will be out of the south, and humidity levels will be moderately high, temperatures likely wont reach their full potential in the RRV, as these types of conditions tend to surpress our temperatures somewhat. As a result, we will likely ''only'' reach about 34 or 35°C in Winnipeg today, which will give us humidex readings near 40. IF we were to see a more southwesterly wind and lower humidity levels, today could have been a 38°C day in the 'Peg.

     Hottest temperatures are expected to be in southwestern Manitoba where air aloft will be warmest. Highs between 35 and 38°C will be possible in Brandon, Melita and Killarney.

     Things will be cooler tomorrow and Friday behind the cold front, however it will still be in the high twenties! More heat looks possible this weekend when we may hit 30°C once again.


  1. NAM is giving Winnipeg a high of 36°C Saturday as another system in the northern Prairies brings back the very hot air from south of the border. Again, winds don't look favourable at this point with a southeasterly wind. Will be a hot start to September!

  2. Severe thunderstorm watches issued for southwestern, western and Interlake region of Manitoba for late afternoon and evening. This is in anticipation of a cold front that will swing through. The chance for storms is low in areas south of the Yellowhead, and higher in the Interlake and western Manitoba. The usual large hail, damaging winds, torrential downpours are possible. An isolated tornado cannot be ruled out given the shear present.

  3. Wow, sauna-like out there! 36.2°C at 3 pm in Brandon, 34.5°C in Winnipeg with humidex 42. Crazy for this time of year.

  4. Official high in Winnipeg today was 35.4°C, tying July 29 for hottest day of the year. Hot spot in Manitoba (and Canada) today was Dauphin at 37.9°C!

    Breezy winds are keeping the RRV quite hot and humid well after sunset tonight, as they help mix down the warm air aloft down to the surface. Still 30°C in Winnipeg at 10pm with a humidex of 36 as a result. A good night to close the windows and crank up the AC! We will have to wait until the cold front passes to see any significant relief. The front should pass early overnight, cooling things down to the mid teens by early morning. Thunderstorm chances look very low with this front; I think it would be a miracle if we got a storm quite frankly.