Marine Weather and Tide Forecast for Williams, OR

FXUS66 KMFR 142144 AFDMFR

Area Forecast Discussion National Weather Service Medford OR 244 PM PDT Tue Oct 14 2025

DISCUSSION
After a cloudy start to the day, skies have cleared across most of the region. Some lingering stratus remains banked up against the east slopes of the Warners and Cascades north of Crater Lake, but this is gradually eroding as well. High temperatures are running around 5 to 10 degrees warmer than this time yesterday, but will still max out at around 5 degrees below normal for this time of year. There are some light returns on the radar across eastern Lake and Modoc Counties as that area remains on the far northwestern periphery of the low pressure that passed through the region yesterday. These light showers could continue into the overnight period, but we don't expect much to amount from them.

Meanwhile, guidance shows skies remaining clear across most of the area tonight, which will allow for much cooler overnight temperatures compared to this morning, especially east of the Cascades. Am skeptical of how much clearing guidance wants to hold on to for the West Side Valleys tonight given the time of year and recent moisture. It's more likely that low clouds will develop again tonight in the Rogue/Illinois/Applegate/Umpqua so temperatures should remain above frost/freeze thresholds there. Additionally, dewpoints are expected to remain in the upper 30s, so even if skies do remain clear, temperatures should still remain above those thresholds. For the Scott/Shasta Valleys in California, temperatures will be a bit cooler, but should also remain above frost/freeze thresholds. As high pressure nudges in and northerly flow sets in on Wednesday, expect more widespread clearing of skies for Wednesday night, and this is when temperatures will drop for areas east of the Cascades (mid-upper 20s) and across northern California (low to mid 30s). At this time, it looks like a widespread frost is possible for the Scott/Shasta Valleys, and potentially in the colder portions of the Rogue/Illinois/Applegate Valleys Wednesday night. Confidence is lower for the valleys north of the OR/CA border due to the potential for another night of cloud cover. After seeing if or what the extent of cloud cover develops tonight, it should help boost confidence one way or the other on where Frost Advisories are warranted for Wednesday night. From Thursday night onward through the weekend, overnight temperatures trend warmer so frost/freeze concerns diminish.

Otherwise, quiet weather is in store for much of the week with afternoon highs staying on the cool side and hovering around 5 degrees below normal (upper 60s for the West Side/upper 50s across the East Side). Temperatures trend slightly warmer on Friday and even more so on Saturday as high pressure moves over the Pacific Northwest. Active weather returns late in the weekend with models and ensemble guidance in rather good agreement on the next system arriving at the coast late Saturday night/early Sunday morning.
/BR-y
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