textproduct: Eureka

AVIATION...(00Z UPDATE)

Stratus continues for most of the Nort Coast this afternoon. Periods of clearing to VFR are possible, yet prevailing conditions of MVFR are to be expected with northerly winds. Overcast MVFR conditions are likely tonight (>85%) for the coastal areas. Minimal day time clearing to VFR is expected tomorrow before 00Z with MVFR being the continued prevailing condition through Saturday along the coast. Inland, terrain influenced winds are expected through 03Z then drainage winds <3kts are expected through the evening before winds increase again, primarily out of the NNW by 20Z (+/- 1hr). VFR is expected for all areas outside of the marine layer. DS

PREV DISCUSSION

/issued 344 PM PDT Fri Sep 18 2026/

KEY MESSAGES...

* Warmer and drier interior temperatures into the weekend with highs in the 90s by Sunday.

* A shallow but strong marine layer forming close to shore with persistent marine clouds.

* Similar warm and dry conditions early next week with potential clearing near shore by Monday.

SYNOPSIS...High pressure building will allow for slightly warmer than normal interior temperatures through the weekend. Meanwhile, persistent marine stratus will hang along shore. Similar conditions will continue into early next week.

DISCUSSION...High pressure had started to rebuild across the area. The day started with extensive marine influence stretching far into inland valleys. Despite the slow start, high pressure has allowed for interior locations to warm back into the 80s. Marine influence has been persistent along shore with thick stratus remaining all day.

High pressure will continue to strengthen through the weekend. By Sunday, highs for eastern interior valleys will most likely reach the low to mid 90s. Marine influence will become increasingly shallow but remain persistent along shore. Weak low pressure moving into the central California Coast early next week will weaken high pressure, but temperatures will most likely remain slight above normal for the interior. For the coast, the low could disrupt the marine layer, allow for some sunnier skies and warmer temperatures by Monday and Tuesday.

Most ensemble members show high pressure reforming around Wednesday and Thursday. This high pressure will most likely be moderate, but a few members continue to show it stronger, possibly allowing for some interior locations to graze 100 degrees. Most ensemble members also show a weak cold front of some description late next week, but essentially none of them show any wetting rain. /JHW

AVIATION...Extensive marine influence socked in near coastal valleys with fog early this morning.. Marine clouds have only slightly lifted to mostly MVFR conditions this afternoon. Some brief scattering is possible early this evening, but IFR ceilings will almost certainly rebound all long the coast before sundown. High pressure will encourage a narrow but persistent deck of clouds along shore through the weekend. /JHW &

MARINE...Gentle winds have turned northerly though the day today with some more moderate winds starting to form just downwind of Cape Mendocino. Moderate to strong northerly winds will gradually return to the southern waters overnight gradually spread north through the weekend, though winds will most likely remain much calmer closer to shore. Short period wind waves will dominate the marine environment building over 8 feet in the outer waters by Sunday. There remains only a very minor southwest mid period swell up to 2 feet to speak of. /JHW

EKA WATCHES/WARNINGS/ADVISORIES

CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from midnight tonight to 9 PM PDT Sunday for PZZ455.

Small Craft Advisory from 3 AM to 9 PM PDT Sunday for PZZ470.

Small Craft Advisory until 9 PM PDT Sunday for PZZ475.