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and it has been ten years since the yarnell hill fire claimed the lives of 19 firemen. we'll look back at their legacy, how that wildfire and climate change have crews changing their strategies. that's coming up. we're going to start, though, with extreme weather across the country, from heat waves to heavy winds and rain, cancelled outdoor celebrations and even ruined some travel plans over the holiday weekend. nbc meteorologist michelle grossman, with what we can expect. and first, here's blayne alexander. >> reporter: there's no question summer is in full swing, if you doubt it,...

And i don't think anybody's filled with confidence yet on what's going to happen. the nine modernized ukrainian armored brigades have not yet been committed. all of this nonsense from the russians about losses of tanks, these are minimal forces that ukrainians have not yet committed their main battle force. >> general, the chairman of the joint chiefs of staff says the u.s. is considering providing ukraine with cluster munitions, and he says russia is using them, ukraine has gotten them from other allies, there's a push to ban them entirely because of the danger they pose to civilians. i mean,...