Synopsis: The first half of next week is likely to bring some of the first storms to kick off monsoon season 2019 here in the Valley. But first, we have to get through this weekend with mostly dry conditions and temperatures near or slightly above normal. Thus far, the bulk of monsoon thunderstorms have largely remained confined to Sonora Mexico, which has provided us with high-level cirrus clouds this past week. This will continue until Sunday when a high-pressure system sets up over the four corners region resulting in a predominately southerly flow that will allow more moisture to find its way into the Valley. Dew points are expected to increase overnight Sunday into the mid to upper 50s. Combined with sufficient daytime heating the atmosphere should be unstable enough to allow some storm activity and rain to make it into the lower deserts. We’re almost there!
For today, expect afternoon highs near 105° F for the Valley under partly cloudy skies and calm conditions. Tonight, expect overnight lows of around 85° F for the warmest urban areas under partly cloudy skies and gusts up to 15 mph.
Tomorrow, expect mostly sunny and calm with afternoon highs in the 106° F - 109° F range. Overnight lows in the mid-80s for most locales with gusts up to around 15 mph from outflow boundaries moving through the valley under increasing clouds.
Sunday afternoon, expect partly cloudy skies with highs near 109° F for the Valley and winds gusting up to 15-20 mph. Overnight, partly cloudy with lows in the upper 80s for urban areas and increasing dew point temperatures. Monday evening, scattered storms likely. Look for more details in Monday's weather outlook. Stay tuned!