Thursday - Sunday Fire Weather Forecast

SYNOPSIS (Thurs): The [Coastal Fire] area continues to lie between an upper ridge to the east and an offshore upper low, bringing variable conditions from cloudy to clear and patchy showers in western regions of the island. Smoke is causing shading and visibility issues supressing temperatures and moderating humidity, with effects worse in the south. On Thursday instability is supplemented by a more solid sub-tropical feed which may overcome the effects of the smoke. Potential of lightning through the southern third of the area with a risk in other parts. 

OUTLOOK (Fri- Sun): Into Friday and Saturday the offshore upper low starts to move, coming onshore into Oregon and pushing precipitation north into southern regions. This system is expected to maintain cooler, more seasonal temperatures but push humidity values upward through the driest areas, potentially bringing some lightning. Precipitation amounts trend toward lower values. Saturday is also likely the best chance for smoke to move out of the region as inflow/westerly winds are expected. 

Late Saturday this feature departs, and a weak upper ridge moves over the area again for early Sunday, bringing everything from variable cloud to sunshine again, and patchy light showers, however an approaching upper trough pushes some instability ahead of it returning more showers later in the day.

TIVFD