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.