Phoenix, AZ – Arizonans could see a noticeable shift in weather just ahead of the Christmas holiday as a wetter pattern develops across the Desert Southwest later this week.
According to the National Weather Service in Phoenix, persistent high pressure that has kept conditions dry will begin to shift eastward by midweek. In its place, a strong low-pressure system is expected to set up off the West Coast, allowing abundant Pacific moisture to stream inland and increase rain chances across Arizona.
Forecasters say cloud cover and rain chances could begin increasing as early as late Tuesday, with the most widespread impacts expected Wednesday into Christmas Eve. Moisture levels during this period may rise to two to three times above normal, signaling a more favorable setup for measurable rainfall.
The highest impact areas include portions of central and southern Arizona, with regional travel impacts possible, especially during periods of steadier rain. While widespread flooding is not currently anticipated, wet roads could slow holiday travel and create slick driving conditions.
Snow levels are expected to remain high, generally above 7,500 to 8,000 feet, limiting winter impacts to the highest elevations. This suggests most lower desert communities will see rain rather than snow if precipitation develops.
The National Weather Service notes there is still lower confidence in exact rainfall totals and the precise timing of peak rain chances. Forecasts may be refined as the system approaches and confidence increases.
Residents planning holiday travel are encouraged to stay updated on the latest forecasts and allow extra time on the roads later this week.
