Monsoon moisture was moving back into Southern California from the southeast, and isolated showers or thunderstorms could develop over the mountains Sunday afternoon, National Weather Service forecasters said.
Increasing humidity and clouds on Monday and Tuesday could moderate the heat but bring better chances for more extensive showers and thunderstorms, the NWS said. Some drying was possible after Tuesday, but small chances for mountain and desert thunderstorms may persist through the end of the week.
Thunderstorms began gathering in the Riverside Mountains early Sunday night, bringing the possibility of heavy rain, lightning, gusty winds and localized flooding to the area, NWS tweeted.
The shallow sea layer along the coast was expected to persist. Expected a limited number of low cloud formations during the night.
High temperatures along the coast on Sunday were forecast at 76 to 81 degrees with overnight lows of 64 to 69. Highs were expected in the western valleys of 88-93 and 94-99 near the foothills with overnight lows of 66-71. Mountain highs were expected to be 91-98 with overnight lows of 67-73 and desert highs were predicted to be 109-114 with overnight lows of 81-87.
The increased humidity is good, right? Maybe not. NBC 7’s Joe Little has the answers.
Northwesterly winds gusting around 20 knots may occur over parts of the outer coastal waters between 30 and 60 nautical miles offshore late Sunday afternoon and early evening.