LAS VEGAS — We've seen a couple rounds of scattered showers and thundershowers around Las Vegas this Friday morning and midday, with additional passing storms possible through the afternoon into the evening. Highs try to reach 102° in between the downpours but most of the day is spent in the 90s. Temperatures tonight fall to the upper 80s as a small chance for thundershowers lingers.
Saturday in Las Vegas will be mainly cloudy and in the mid 80s with only isolated showers and thundershowers in the morning. The rain will turn widespread starting Saturday afternoon, and lasts though Saturday evening and night into Sunday. After 80s on Saturday, highs will not escape the upper 70s on Sunday as thick clouds accompany the wet weather; that's about 25° below average for mid-August in Las Vegas. Monday sees mid 80s as widespread showers and storms linger.
A Flood Watch is posted from late Saturday morning through Sunday into Monday afternoon as moisture from Hurricane Hilary moves through California, Nevada, Arizona, and Utah. Las Vegas expects around 2" of rainfall across these three days, with 4" possible in the Spring Mountains, and 6" in the Southern California deserts. Flooding will likely develop as this tropical moisture moves through the Desert Southwest these days. Runoff from the mountains could cause substantial flooding problems in adjacent valleys, including Las Vegas and Pahrump.
As the moisture from Hurricane Hilary is slow to thin out, Tuesday, Wednesday, and Thursday see a continued 40% chance for pop-up showers and storms. Highs climb to the upper 80s and low 90s those days, which is still about 10° below average.
