303
FXUS66 KMFR 271043
AFDMFR

Area Forecast Discussion
National Weather Service Medford OR
243 AM PST Thu Nov 27 2025

.DISCUSSION...Fog is starting to fill the Umpqua Valley, with
tripcheck cameras showing impaired visibility at multiple spots on
Interstate 5, especially at Canyon Mountain. Cameras also show
some development over western Grants Pass. Satellite imagery is
indicating fog developing in the Illinois Valley and parts of the
Klamath River Valley. Working against the fog is an approaching
cold front that looks to bring showers to Coos, Curry, Josephine,
and Douglas counties early this morning. While amounts will be
light, the combination of rainfall in those counties and southerly
winds across the area may be enough to break up west side valley
fog. For other areas, today looks to remain mild and uneventful.

Please see the previous discussion below for more details on the
short- and long-term forecast. -TAD

&&

.AVIATION...27/06z TAFs...This evening and tonight, a front will
move onshore and bring drizzle and rain along the coast with areas
of MVFR and local IFR. These conditions will continue into Thursday
morning. Inland, VFR conditions will be the predominate condition
through this evening and likely through the overnight period. The
incoming front is expected to bring increased high and mid clouds
tonight west of the Cascades. However, if there a period of clearing
in the late evening and overnight period, local IFR in valley fog is
possible for valleys west of the Cascades. Overall, confidence is
low in this occuring so have kept mention out of the Medford and
Roseburg TAFs. Then, early Thursday morning, local MVFR in low
clouds and rain is expected to develop in the Umpqua Valley,
including at Roseburg, especially between 12Z-18Z. General
improvement to VFR is expected in the afternoon.


&&

.MARINE...Updated 200 PM PST Wednesday, November 26, 2025...
Southerly winds increase again tonight into Thursday morning
as a cold front passes through the region. Meanwhile, a heavy
northwest swell will move into the waters late Thursday morning and
afternoon. These conditions will bring the return of steep seas to
all waters, with very steep seas north of Cape Blanco due to a mix
of wind waves and the heavy swell.

Conditions improve late Friday as winds turn northerly then persist
through the weekend and into early next week. Conditions hazardous
to small craft could return south of Cape Blanco on Sunday.
Meanwhile, a long period swell (peaking around 6 to 9 ft at 16 to 19
seconds) builds in the waters early next week, which could maintain
advisory level conditions into early next week.


&&

.PREV DISCUSSION... /Issued 239 PM PST Wed Nov 26 2025/

DISCUSSION...A warm front has lifted north with high pressure and
mostly clear skies across the area this afternoon. A low pressure
center will near the coast of Washington and northern Oregon
tonight with a cold front moving onshore by Thursday morning. This
front will be weaken as it moves inland. Models and ensembles
continue to support moderate to high (60-100%) chances for light
rain along the coast, inland into the coastal mountains, Umpqua
Valley, southwest Josephine County and into the south- central
Oregon Cascades. Low chances (10-30%) for rain are also expected
for the Rogue Valley in Jackson County, northeast Josephine
County, far western Siskiyou County, and far northern Klamath
County. East of the Cascades, expect dry but breezy to gusty
conditions on Thursday.

Then, Thursday night the low moves inland north of the area. This
will bring onshore flow and  a trough over the area. Ensembles
show chances for rain showers continuing along the coast (70-95%)
along the coast and inland across Josephine (30-60% chance),
Douglas County (70-90% chance) and across the south- central
Cascades (35-75%). Low chances for showers (10-40%) are expected
across Jackson, far western Siskiyou and northern Klamath
counties as well. Precipitation will be light and snow levels
will be high, around 6000-7500 feet on Thursday, lowering slightly
around 5500-6000 feet Thursday night. So expect little if any
snow is expected, except for higher peaks in the south-central
Oregon Cascades. Light scattered showers linger into Friday across
northwest portions of the CWA, before tapering off during the
afternoon.

On Saturday, models show a building high pressure ridge offshore
with a shortwave trough moving down from the north late Saturday
and Saturday night. This trough may be far enough east that little
if any showers will develop over the area. The National Blend of
Models is showing low chances (10-30%) for light rain and higher
mountain snow across the area during this period Saturday
afternoon and Saturday night. We will continue to monitor and
update the forecast as confidence increases.

Sunday and Monday, models are trending towards a high pressure
ridge building inland and a longwave trough east of the area. This
will likely bring stable and dry weather to the area with cool to
cold overnight/morning temperatures. Then, Monday night and
Tuesday, ensembles support a shortwave trough moving down into the
region from the northwest, bringing chances for light rain and
mountain snow. However, there remains significant variability in
the details for this period.

&&

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

PACIFIC COASTAL WATERS...Small Craft Advisory until 4 PM PST Friday
     for PZZ350-356-370-376.

Hazardous Seas Warning until 4 AM PST Friday for PZZ350-370.

&&

$$