textproduct: Medford

KEY MESSAGES

* Warm temperatures continue but decrease day to day until seasonable conditions are present in the middle of the week.

* Dry weather and elevated afternoon breezes are behind continuing fire weather concerns.

* Periods of smoke accumulation are expected over Klamath, Lake, and Modoc counties.

* Thunderstorm chances remain in the forecast, but appear overall slight at this moment.

DISCUSSION

Zonal flow with a slightly southwest orientation is present in the upper pattern, which will bring steadily decreasing temperatures until most areas see seasonal conditions by the middle of the week ahead. Atmospheric moisture remains low in this period of the forecast, which will keep inland skies generally clear. Onshore flow will keep a pattern of marine stratus buildup and erosion along the coast, which may keep daytime temperatures cooler than expected in areas where cloud layers endure into the afternoon. While there are no features that look to cause gusty inland winds, a series of weak disturbances following the upper flow will help to keep afternoon breezes slight elevated. This combination of dry conditions and elevated breezes will keep fire weather concerns elevated for the time being.

In spite of those elevated breezes, smoke remains trapped in some low-lying areas. With westerly or southwesterly flow aloft and currently decreased fire activity, additional smoke reaching west side valleys is not expected. Calm overnight conditions look to allow for periods of smoke accumulation over Klamath, Lake, and Modoc counties.

A somewhat intricate upper pattern develops towards the end of the week, with a cutoff low dropping to the south and building a trough near the Pacific coast. This pattern may bring some monsoonal moisture as well as periods of instability which makes thunderstorms a concern, but agreement on if, where, and when activity develops in the CWA is sparse. Deterministic imagery for Thursday through the weekend shows the main moisture plume shifted eastward compared to model data from 24 hours ago. Thunderstorm triggers are also somewhat lacking at the moment, leading to generally isolated afternoon and eventing thunderstorms east of the Cascades in model imagery. But confidence in any specific outcome remains slight, as any change to the expected conditions could result in more activity or the complete absence of any thunderstorm development through the weekend. -TAD

AVIATION...10/06Z TAFs

Wildfire smoke at Klamath Falls will bring a potential for visibility reductions to MVFR in smoke and even some higher ceilings from the airport eastward tonight through Monday morning.

Expect IFR in marine stratus to develop for areas along the coast north of Cape Blanco tonight into Monday morning. Confidence is moderate for North Bend to see IFR ceilings late tonight and early Monday morning. Strong, gusty north winds up to 30 kt will occur along the coast, including at North Bend, Monday afternoon/evening.

Elsewhere, expect VFR conditions. Medford and Roseburg will be VFR for the next 24 hours with just some locally breezy winds this afternoon/evening (gusts to 20 kt).

MARINE...Updated 230 PM PDT Sunday, August 9, 2026

Gusty north winds continue over area waters, with areas of gale force gusts and very steep seas south of Port Orford. Elsewhere, gusty winds and steep seas are expected. These conditions are expected to continue through Wednesday evening. Winds look to ease on Thursday but unsettled seas could continue into next weekend. -TAD

FIRE WEATHER...Updated 200 PM PDT Sunday, August 9, 2026

We'll stay in a pattern of very warm, very dry, and occasionally breezy conditions today through mid week. This pattern includes overnight breezy east to northeast winds at ridge tops of SW Oregon and NW California (most notably the Coast Range and Kalmiopsis Wilderness) along with poor to moderate RH recovery. A channeling of winds down the Chetco could result in some drier/warmer conditions along the SW Oregon coast as well.

Upper level ridging shifting back toward the Four Corners will allow westerly zonal flow aloft to bring lower heights and modest cooling to inland areas. Generally, the trend will be to lower daytime MaxTs down by a degree or two each day, and this should subsequently allow daytime MinRHs to be slightly higher. Even so, it'll be dry and unstable, so any fires on the landscape will still have the ability to grow significantly, especially during the peak burning periods during the afternoons/evenings. Overnight RH recoveries haven't been good the last couple of nights, generally only in the 20-35% range for some of the upper slopes and ridges. There should be slight nightly improvement in recoveries from NW to SE through the period. Things trend toward normal for mid next week, but temperatures still probably remain a few degrees above normal for most locations.

Models and ensemble guidance continue to show a weakness or upper trough developing near or just off the California coast Wed/Thu and also show an increase in monsoonal moisture coming up from the south late week. Right now, models have lessened the risk a bit, but still bring isolated lightning chances up into NorCal around Thursday with the best chance for showers and isolated thunderstorms Fri/Sat from NorCal up the Cascades and over to the East Side. But, given plenty of uncertainty in strength of forcing mechanisms and overall instability, confidence has notched downward a bit in this forecast cycle. Keep checking back for updates since any lightning brings with it the risk of new fire starts. -Spilde

MFR WATCHES/WARNINGS/ADVISORIES

OR...CA...None.

PACIFIC COASTAL WATERS...Gale Warning until 11 PM PDT Wednesday for PZZ356-376.

Small Craft Advisory until 11 PM PDT Wednesday for PZZ350-356- 370-376.