david han julia is an associate professor arrazola state university. he explains why this weather patton is so dangerous. we have a perfect recipe for a dangerous heat event. this weekend and into early next week in the western us, a combination of an unusual meter article pattern called a blocking event. and that signal is on top of long scale climate change and for cities, this urban is ation effect that raise the temperatures there as well. you can imagine at the normal flow, the normal way the wings are circulating around the planet has been disrupted. and a particular pocket of high pressure has been cut off from that normal flow around the planet. and unfortunately, we're going to see that that high pressure, which leads to high temperatures cit over the pacific northwest for at least a few days. columbia is offering a reward of $800000.00 for information about those behind and a tackle a helicopter accounting president. the van, do k, the police director says a gun found near the scene has been linked to venezuela. the helicopter was 5 on while