NWS Forecast Office Phoenix, AZ

Another round of scattered showers and thunderstorms is expected this afternoon and evening. Activity will initially develop across the AZ higher terrain in N, E, and SE AZ during the afternoon. The showers and storms are likely to survive into the lower deserts this evening with chances near 25-30%. Strong winds (greater than 35mph) will be the main concern. Frequent lightning and locally heavy rainfall are also expected with any storms.

Strong high pressure over the Southwest will lead to abnormally hot temperatures through at least the next week with temperatures 5-10°F above normal and near record territory at times. This will result in Major to Extreme HeatRisk across much of the lower deserts. The Extreme Heat Warning has now been extended through Saturday, 29 August for much of the area.

Afternoon high temperatures across lower desert communities will be several degrees above daily normals through next week. Low temperatures in the 80s and lower 90s will be common resulting in little overnight relief. Areas of major to extreme HeatRisk will continue with Extreme Heat Warnings remaining in effect through Friday, August 28th.

Daily thunderstorm activity through early next week will be focused across the Arizona higher terrain locations. Only a slight chance (less than 20%) of thunderstorms reaching lower desert communities will exist. However, gusty outflow winds with patchy blowing dust will be possible. Temperatures several degrees above normal will persist through next week with areas of major to extreme HeatRisk. An Extreme Heat Warning remains in effect through Friday August 28th.