A late summer heat wave continued to drive up temperatures and deliver unsettled weather conditions to much of the Southland Tuesday, with heat advisories extended into Wednesday.

“Monsoonal moisture will remain over the region through at least Wednesday, bringing risks of strong winds, brief heavy downpours, lightning, and fire starts,” according to the National Weather Service.

Storm activity moved into parts of eastern Los Angeles County Tuesday morning, with reports of thunder booming over parts of the San Gabriel Valley. Forecasters said the threat of storms will linger into Wednesday thanks to the unsettled conditions, but mainly in mountain areas, the Antelope Valley and eastern San Gabriel Valley.

Heat advisories issued by the NWS that had been expected to expire at 6 p.m. Tuesd

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