textproduct: Medford

DISCUSSION

After a substantial marine push this morning that filled nearly all of the West Side valleys with low clouds and fog, the skies have mostly cleared with plenty of sunshine now over southern Oregon and far northern California.

Today and tomorrow (Friday), with upper level flow in a near zonal to very low amplitude ridging pattern, daytime highs will be very near to just slightly above normal for early June, with the typical breezes in the afternoon. Cloud cover increases tomorrow afternoon as the next upper level trough, currently sitting just offshore of British Columbia, approaches the region. The trough will dig farther into the Pacific Northwest Saturday, and while the center of low itself passes over Washington, the trough axis will swing over our area late Friday into Saturday, bringing another round of afternoon gusty winds both days (remaining well below any thresholds), and a slight chance for light showers over northern Coos and Douglas counties, and maybe some drizzle along the rest of the coast, on Saturday. Areas in Modoc, Lake, and Klamath counties will be under frost/freeze concerns again Saturday night, with overnight lows potentially dropping below freezing in northern Klamath and Lake counties. Overall, temperatures Saturday will be 5 to 10 degrees below normal.

Once the trough departs to the east, seasonal warmth returns under shortwave ridging Sunday, then another trough arrives late Monday into Tuesday. The nature of this trough varies greatly across the model suites in both timing and track, with some passing the center of a closed low over Washington then into the northern Rockies, and others digging farther south to bring the low over Central California and the Great Basin. Both will result in somewhat cool temperatures, but will vary greatly in precipitation chances and nature: the northerly track trending more towards light shower chances, while a southerly track leads to much higher shower chances along with potential thunderstorms.

AVIATION (18Z TAFs)

Satellite imagery indicates low clouds over the Umpqua basin which is impacting KRBG with MVFR ceilings. Expecting this deck to clear out with afternoon mixing. Thereafter, this should be mostly a VFR TAF cycle as the afternoon brings decent mixing and breezy wind speeds today. These will be diurnally driven with speeds diminishing around sunset. Expecting a marine layer tonight that could bring MVFR conditions (~40%) along/near the coast impacting KOTH.

MARINE...Updated 1200 PM PDT Thursday, June 4, 2026

North winds are increasing today as a thermal trough develops along the coast. By late this evening, gusty winds and steep wind-driven seas will cover all but the most sheltered waters south of Cape Blanco. Conditions will improve briefly Friday, then north winds and steep wind driven seas return Saturday afternoon into Sunday morning. South winds will accompany a front on Monday, but otherwise conditions should be relatively calm early next week.

MFR WATCHES/WARNINGS/ADVISORIES

OR...CA...None.

PACIFIC COASTAL WATERS...Small Craft Advisory until 8 AM PDT Friday for PZZ356-376.