Marine Weather and Tide Forecast for Yoncalla, OR

AVIATION
16/12Z TAFs...VFR is expected across inland areas through late tonight. There is a slight chance of a shower or thunderstorm over portions of the East Side and/or norCal this afternoon/evening. Along the coast, MVFR and local IFR this morning will clear to VFR by late morning, but then some may redevelop late tonight. -Spilde

PREV DISCUSSION
/Issued 248 AM PDT Mon Jun 16 2025/

DISCUSSION...Satellite imagery this morning is showing stratus and fog along the coast and just inland north of Cape Blanco, but also south of Gold Beach, and especially around Brookings.
Some of the lower clouds could reach into the lower Umpqua Valley near or just north of Roseburg this morning. Some high clouds are streaming across inland sections, but many areas are clear.

An upper level trough offshore this morning will move onshore this afternoon. Modest moisture and instability could lead to some buildups over the mountains, but especially near/downwind of Mt.
Shasta and also over the East Side this afternoon and evening.
This could generate some showers and an isolated thunderstorm or two over there while areas west of the Cascades remain dry. Expect an uptick in afternoon/evening breezes compared to yesterday.
Peak gusts in the 20-30 mph range will be common. Overall, MaxTs will trend down a little from yesterday over the west side, but may be up a couple of degrees east of the Cascades.

Shower chances diminish as the trough axis shifts east of the area this evening. A dry, stable air mass moves in on Tuesday and this will result in warmer temps by about 3-6F compared to today. This means highs in the mid to upper 80s for the valleys west of the Cascades and generally 80-85F for the East Side and in NE California.

A marine push will drive stratus back onshore into the coast Tuesday night. This one may be deep enough to induce some light rain showers/drizzle near the coast into Wednesday morning.
Stratus may also hang out long enough in the Umpqua Basin to knock temps back a little bit there (compared to Tuesday), but most other areas will have highs similar or even a bit higher than on Tuesday.

It remains dry Thursday, then the big changes come Friday into the weekend as a deep upper trough swings through the area. This will bring breezy, cooler weather with some showers and isolated thunderstorms. Just about everywhere will have at least a slight chance of showers, but the highest PoPs will be across the north in Oregon. Temps begin the trend downward on Friday, and on Saturday, we may not make it out of the 60s here in Medford (official forecast is 68F). This could then result in low temperatures for some east side areas down into the 30s, especially Saturday night. So, if you have a backyard garden or sensitive vegetation, keep an eye of forecast low temperatures this week to see if there's any potential for frost. -Spilde

AVIATION
16/06Z TAFs
VFR is expected across inland areas tonight and Monday. Along the coast, MVFR and local IFR will develop tonight, clearing to VFR late Monday morning. -CC

MARINE
Updated 200 AM Monday, June 16, 2025
Weak disturbances today through Tuesday night will result in lighter winds and lower seas over the marine waters, but with areas of stratus and possibly even some light rain showers or drizzle. North winds will increase again Wednesday, especially south of Cape Blanco, with a period of steep seas possible during the afternoon that could last into Thursday. Another system could bring showers Friday into the weekend. -Spilde

MFR WATCHES/WARNINGS/ADVISORIES
OR...None.

CA...None.

PACIFIC COASTAL WATERS...None.