Dangerous heat arrives for Friday and Saturday

Posted at 4:36 PM, Jul 05, 2018
and last updated 2018-07-05 19:36:04-04

Excessive heat warnings are in place for SLO and SB counties in advance of developing heat as the weekend arrives.

Many areas will experience temperatures near 100 on Friday, only some west facing beaches will avoid the extreme temperatures topping in the 80s.  Inland valleys of SLO county will likely be the warmest spot with temperatures 102-107, Saturday and Sunday inland could see temps 105-110.  Coastal valleys and the Southcoast will also be hot Saturday near 100 again, with only a few degrees of cooling Sunday.

The excessive heat warning urges people to prepare for the heat by planning to be indoors during peak temperatures and hydrate properly.

The key to the event will be offshore winds.

Offshore wind pick up Friday morning at 15-25mph.  Similar offshore winds will happen again Saturday and Sunday morning.  This will produce mostly clear skies outside of high clouds.  It will hold marine cooling at bay and temps will soar.  Inland valleys will top 100 and be near 105-108 Friday-Sunday.  Coastal valleys will be in the mid 90s to near 100 Friday and Saturday.  Some afternoon onshore flow should kick in keeping temps from going even higher.

The ridge of high pressure in place will keep things warm/hot into early next week, some mid-week cooling is likely at the coast but inland temps stay warm.  The pattern looks to stay warm inland into mid-month but near the coast some marine layer returns for milder conditions near the ocean.