By Reginald Stanley. Posted July 23, 2019, 6:53 PM.

High pressure situated over the Four Corners region is contributing to both high temperatures and monsoonal flow to Southern California this week.

Cloudy skies and relatively high humidity kept overnight temperatures rather high into Tuesday morning. Shortly after midnight Tuesday, isolated showers popped up over parts of the Inland Empire, and this activity increased and became more widespread shortly after sunrise. Heavier showers and extensive lightning were reported in the Santa Ana Mountains Tuesday morning. Following a lull in thunderstorm activity west of the mountains mid-day Tuesday, additional thunderstorms formed over parts of the Inland Empire later Tuesday afternoon, hitting WeatherCurrents' station in Perris hardest (where 0.24 inches fell). Even WeatherCurrents' station in the somewhat remote mountain community of Pinon Hills, in the northern San Gabriel Mountains, reported 0.07 inches from a thunderstorm Tuesday afternoon. WeatherCurrents' stations in Beaumont (Cherry Valley), Lake Elsinore, Wildomar, Murrieta, and De Luz were also affected.

The monsoonal moisture did not stop temperatures from climbing into triple-digits across much of the region early Tuesday afternoon, however. Lake Elsinore and Wildomar, as is typical during summer heat spells, were both the hottest locations in the WeatherCurrents network on Tuesday. Monsoonal moisture and high heat are forecast to continue affecting the region through Thursday, before a drying trend and further hot temperatures are expected to take place over the weekend.

Here are the rain totals for the WeatherCurrents network and associates: