The figure above indicates the forecasted high in orange (with error bar denoting the range of ensemble forecast members), average high for this time of year in orange (dashed line), forecasted low in blue (with error bar), average low this time of year in blue (dashed line), and forecasted wind speed in purple. Note that the wind speed forecast is sustained wind (not gusts), and it is based on only one model (not an ensemble).
High pressure will give way to a trough of low pressure from the Pacific this coming weekend. An associated cold front will move across the state of Arizona late on Saturday morning, bringing a chance of rain showers. Expect increasing clouds and breezy conditions on Friday – Saturday, with perhaps a quarter to half inch of rain with the passage of the cold front. In the afternoon and evening on Saturday, there is a slight chance of some lingering light rain or even wet snow showers, but little or no accumulation is expected. Watch for icy spots to develop on any wet roadways or sidewalks Sunday morning as temperatures will likely drop below freezing.
Next Tuesday night - Wednesday, some forecast models are indicating that another storm system could bring another round of rain or snow showers. Stay tuned for updates next week!
Met Mail is an unofficial weather discussion and forecast transmitted once or twice a week via e-mail by the Embry-Riddle Department of Meteorology (http://meteo.pr.erau.edu/). Embry-Riddle offers an undergraduate bachelor-of-science degree program in Applied Meteorology. Please spread the word to all potential qualified candidates!
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Official National Weather Service forecast