Lost Coast Trail

The big issue this trip is the weather window closing hard on Thursday night. Wednesday through early Thursday is fine — partly sunny, light SSE winds 8-13 mph, temps in the low 60s, only a 42% chance of light rain by Thursday afternoon. That's workable hiking weather. But Thursday night flips to 100% rain with showers and embedded thunderstorms and winds gusting to 22 mph SSE, and Friday holds at 100% precip with gusts to 28 mph. The NWS Eureka Wind Advisory runs through Thursday 1 PM, so you're already in advisory-level conditions on the coast today and tomorrow. The Lost Coast is fully exposed to SSE flow — expect those gusts on the beach and especially on any headland crossings.

The stream crossing picture is the other concern. The USGS gauges in this dataset are Central Coast stations and don't directly reflect Lost Coast drainages like Big Flat Creek, Buck Creek, or the Mattole River mouth crossing if you're doing the full trail. What they do tell you: regional basins are running near to slightly above median right now with no major storm in the recent past. Those crossings are likely manageable today and Wednesday. The incoming storm Thursday into Friday changes that fast. Warm rain on the coastal range will drive those unnamed drainages up quickly — expect significant rises by Friday morning, potentially within 6-12 hours of heavy rain onset Thursday night. If you have any creek crossings remaining on Friday, that's the scenario where they go from ankle-deep to thigh-deep overnight.

Fire and air quality are a non-issue — no active fires within 50 miles, clean air all trip. Snowpack is irrelevant at these elevations.

For timing and logistics: start strong today and Wednesday while the weather is cooperative. If you're doing a south-to-north route, push miles now. Plan to complete any tidal or creek-dependent sections by Thursday midday at the latest, before the rain really sets in and before the tide window gets complicated by swell from the approaching system. Given 10 hours of usable daylight (sunset at 5:04 PM), you'll want camp set by 4 PM to avoid headlamp time on beach terrain. If your exit is Friday, have a bailout plan — the trailhead roads and final creek crossings could be significantly more challenging in 28 mph gusts and active thunderstorms.