Mount Shasta, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

592
FXUS66 KMFR 241745
AFDMFR

Area Forecast Discussion
National Weather Service Medford OR
945 AM PST Sat Jan 24 2026

.DISCUSSION...Updated Aviation Section...

&&

.AVIATION...Satellite shows the areas with low
clouds/fog are near the Umpqua Basin, western Rogue Valley near
Grants Pass, and in portions of Lake County. This will continue
burning off through the morning, bringing all areas to VFR
conditions which will prevail through the day.

The drier air will continue to lower the overnight fog risk for the
Rogue Valley, although the Umpqua Basin could still see lower
ceilings/fog tonight. This was added to the Roseburg TAF by LIFR
ceilings at 10Z and LIFR visibility at 12Z. -Hermansen

&&

.PREV DISCUSSION... /Issued 224 AM PST Sat Jan 24 2026/

DISCUSSION...High pressure remains in control, keeping the area
dry through at least the middle of next week. The shortwave that
passed over the area yesterday did manage to break the
persistent valley inversions west of the Cascades, and allowed
some drier air to mix in. This has limited, but not prevented, fog
formation this morning, with shallow fog developing in the Umpqua
Basin and in the lower Rogue Valley near Grants Pass. This later
formation of fog allowed temperatures to cool quickly before
setting in, resulting in cold temperatures and making that fog
into freezing fog.

East of the Cascades, the opposite has occured, with some added
moisture in the lower levels resulting in widespread low clouds
across the valleys of Lake and northern Klamath counties, and
even spreading into Modoc county in the last few satellite scans.
Here, low temperatures have been moderated a bit by the blanket of
clouds, but it is still quite cold with temperatures in the teens
and low 20s.

All the areas not covered by fog or low stratus will see some cold
temperatures this morning, and by tomorrow morning, with even less
cloud/fog, temperatures are likely to trend as cold if not
colder. The dry air west of the Cascades has also allowed for near
to below freezing temperatures along the coast north of Cape
Blanco. A Freeze Warning is in effect for there, with a Cold
Weather Advisory in the Umpqua. Details on these can be found at
PDXNPWMFR.

This same pattern will continue into early next week, when it
looks like the ridge will finally begin to break down, allowing
for a few wet systems to make their way into the area. These
ridges are notorious for sticking around for a long time, while
the models are notorious for having some difficulty in predicting
the breakdown. Therefore, while there are signs that
precipitation is possible with the arrival of a few systems mid to
late next week, experience tells us that this is far from
certain, especially with models already backing off on the
strength of any troughs that try to approach the West Coast.

MARINE...Updated 200 AM PST Saturday, January 24, 2026...
North winds and steep wind-driven seas will continue this morning,
especially beyond 10 nm from shore. Winds will gradually diminish
and shift to the northeast later today, with steep seas becoming
dominated by a moderate west swell. Winds will remain strongest in
the outer waters. Conditions are expected to improve early next
week. A more active pattern is expected to begin Tuesday afternoon,
with increasing southerly winds (approaching advisory strength in
the outer waters).

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...Freeze Warning until 10 AM PST this morning for ORZ021.

     Cold Weather Advisory until 11 AM PST this morning for ORZ023.

CA...None.

PACIFIC COASTAL WATERS...Small Craft Advisory until 1 AM PST Sunday
     for PZZ350-356-370-376.

&&

$$