As we head back toward 100 degrees for highs by Thursday, the cause is a ridge of high pressure in the upper atmosphere building into Arizona from the west. The high will certainly be strong enough to warm us up but it’s not going to hang around very long so the warm spell should be limited to about three days. After that, a storm system developing off the coast of the Pacific northwest will head our way and bring us cooler temperatures by Sunday. And northern Arizona may see a shower or two Sunday and Monday as the storm is forecast to “cut-off” from the main jet stream and swirl around Arizona for a few days.
Overnight lows for Wednesday morning will be in the 60s and we’re looking for highs in the upper-90s. By Thursday, we return to triple-digit highs and will stay there for Friday and Saturday. (For those of you entered in Arizona’s Family “103-degree contest,” there’s a slight chance we could make that sometime this week.)
Sunday and Monday, we cool down into the mid-90s and by Tuesday, we’ll see highs around 97. The best chance for rain in the high country will be Monday, but again, we expect nothing more than isolated showers if the rain does materialize. BTW, by this time last year, we had already recorded 13 days of 100 degrees or more. So far this year, we’re at just two days.