Metro Detroit Weather: The heat wave gets started.

An Extreme Heat Warning has been issued for all of southeast Michigan from noon Tuesday to 8:00 p.m. Thursday. Heat index values will be 105°-109°. Stay cool during this time. Not everyone has air conditioning, so check on your family, friends, neighbors, and pets to make sure they're staying cool. Watch the forecast belowWe have begun our stretch of hot and humid weather as high temperatures climbed to near 90° Monday, with dew points approaching the 70s. Temperatures will be slow to cool Monday night, with lows eventually falling into the mid 70s by Tuesday morning.Keenan Smith breaks down heat impact levels and the warning signs for heat strokeTemperatures quickly climb Tuesday with highs surging into the mid and upper 90s across southeast Michigan. Combined with increasing humidity, heat index values will approach or exceed 105° in many locations. An Extreme Heat Warning is in effect starting at noon Tuesday. Heat impacts tend to build over several days, so now is a good time to prepare by checking your cooling plans and looking out for neighbors, pets, and anyone without reliable air conditioning.The heat peaks Wednesday and Thursday with highs near 100° and heat index values between 105° and 110°. Overnight lows will be in the upper 70s both days.Friday brings our first chance of thunderstorms to try and break down this high pressure ridge keeping the heat in place. The storms likely won't be until late, so high temperatures will still climb into the mid to upper 90s.Additional rounds of thunderstorms are likely in the afternoon/evening through the weekend. High temperatures will start to fall, peaking in the low 90s, as the ridge begins to break.Tonight: Mostly clear and muggy. Lows in the mid 70s. Winds: S 5 mph.Tuesday: Mostly sunny with highs in the mid to upper 90s, near 100°. Heat index: 105°-110°. Winds: SW 10-20 mph.Wednesday: Mostly sunny with highs in the upper 90s, near 100°. Heat index: 105°-110°.Connect with 7 First Alert Meteorologists on Facebook and X:Facebook: Dave Rexroth , Hally Vogel, Marisa Woloszyn, Mike TaylorX: Dave Rexroth , Hally Vogel, Marisa Woloszyn, Mike Taylor