A mini heat wave is still on track for Thursday and Friday across Aurora. The details of this heat wave have become clearer as the event draws near. Air conditioners will be humming as September begins.
The National Weather Service in Chicago shows that temperatures rose into the middle to upper 80’s across most of the area this afternoon. Dewpoints have risen into the upper 60’s. Low temperatures for Wednesday night will not fall below the dewpoint, so most areas will see middle to upper 60’s.
Thursday will see high temperatures rise into the middle 90’s across most of the area. The air aloft will be too warm to develop thunderstorms, but a warm front just to the north will help pile moisture in the area. Dewpoints should rise into the lower 70’s. There is no heat advisory out, but the heat index could still bump up to 105 degrees. Use caution when outdoors and drink plenty of water.
Friday will once again see temperatures reach the middle 90’s. A southwest wind gusting to 25mph will bring the warmest low level air over the area. This wind will help mix down drier air, meaning dewpoints will lower into the middle to upper 60’s during the afternoon. This will keep the heat index down, but the dry, hot air being blown in may help some locations reach the upper 90’s. This would be rare for September.
It looks like there will be chances for rain Friday night through Saturday night before a push of autumn like air moves in. Stay tuned for better timing on the precipitation as the weekend nears.