Several minimum temperature records were broken in Riverside County Thursday amid a heat advisory that remains in effect in parts of western Riverside County and a flash flood that is in effect for mountain and desert areas further east.

Riverside’s minimum temperature for Thursday was 76 degrees — a degree hotter than the 75 degree minimum temperature that was recorded for Thursday’s date in 2013.

Palm Springs recorded a minimum temperature of 89, topping a record of 86 from 1991; Thermal saw a minimum of 88 degrees, overtaking a minimum of 86 from 2002; and Indio reached a minimum temperature of 90 degrees, breaking a record of 89, also from 2002.

High temperatures in the mid-to-upper 90s were recorded in the Riverside, Hemet and Temecula areas and the desert reached highs in the low 100s. Murrieta, where firefighters were continuing to battle the 1,400-acre Tenaja fire near La Cresta, saw a high of 95 degrees.

As of Thursday afternoon, evacuations had been issued for all residents on The Trails Circle and in Copper Canyon, south of Calle del Oso Oro between Clinton Keith and Murrieta Creek.

The Murrieta Valley Unified School District announced Wednesday night that all of its schools will be closed Thursday.

The heat advisory, which the National Weather Service originally set to expire at 6 p.m. Wednesday, was extended was set to last until 8 p.m. Thursday.

The NWS also issued a flash flood watch amid a chance of thunderstorms that will be in effect from noon Thursday through this evening in the San Gorgonio Pass near Banning and the mountains.

The high pressure system that has been the driving force behind the hot, sticky and unstable conditions this week will make its way east on Friday and give way to a trough of low pressure moving in northern California, NWS meteorologist Miguel Miller said.

Also covered by the watch are parts of the San Bernardino County and San Diego County mountains.

Thunderstorms will be possible again in the mountains Friday afternoon, but conditions will be cooler and drier throughout the county by Sunday.

High temperatures Thursday could reach 107 in the Coachella Valley and the San Gorgonio Pass near Banning, 101 degrees in Riverside, 94 in Temecula and 100 in Hemet.

The NWS advised that those who work outdoors should avoid the midday sun, wear light, loose-fitting clothing and drink plenty of water.

Cooling centers are open daily across the county, providing residents who do not live in climate-controlled environments a free, cool space to relax until the evening hours.

A complete list of cooling centers is available at _2019.pdf.

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