Scorching heat strikes San Diego County again, expected to last until weekend

SAN DIEGO (CNS) - Another day of scorching heat baked San Diego County Tuesday, Aug. 18, with relief not expected to arrive until this weekend, according to the National Weather Service.

High pressure over the southwestern United States was expected to peak today, then weaken slightly for the latter half of the workweek, forecasters said.

An excessive heat warning is posted until 10 p.m. Thursday in the San Diego County valleys, mountains and deserts.

The California Independent System Operator, which manages about 80% of the state's electricity, warned of possible rotating blackouts Tuesday in...