Thursday still warm inland but cooling develops

Posted at 4:10 PM, Jun 03, 2020
and last updated 2020-06-03 21:21:58-04

Interesting weather pattern continues: there is an upper low jst spinning away to the SW and approaching trough of low pressure for the weekend which will come out of the Pacific Northwest.

Right now neither of those features are here, we have some stagnant surface high pressure. The high pressure is putting the clamps on the marine layer, the cooling is limited to the immediate beaches and only partial cooling in the coastal valleys. Inland folks are experiencing the warmest day of the forecast where many are in 100+ degree heat. Airflow is light right now, another factor not getting cooling air far inland. That light air flow will result in more low cloud cover development at the beaches overnight but more significantly tomorrow. So beach and coastal valley temps are on the way down. The high pressure also looks to weaken as the upper low start to drift east Thursday, inland temps will come back into the mid-90s, still about 10 degrees above normal Thursday.

Friday is the day the upper low finally gets moving, crossing over the area with a lot more low and mid level clouds and much cooler temps. There is also a slight rain chanec for the Southcoast. Our high-res model shows potential on the SB/Ventura county border but essentially anywhere on the Southcoast has a minor rain chance later Friday.

The upper trough approaching the PacNW sweeps thru over the weekend to keep most temps in the 70s with beaches in the 60s.

That trough quickly moves out for a fast-building ridge which will bounce temps back up Tuesday and Wednesday next week.

If I had to look beyond that, to me it appears we have another temp roller-coaster with similar trough then ridge replacements.