540
FXUS66 KMFR 072259
AFDMFR

Area Forecast Discussion
National Weather Service Medford OR
359 PM PDT Mon Sep 7 2026

.Aviation Discussion Updated...

&&

.AVIATION...08/00Z TAFs...VFR prevails across the area this evening,
with gusty north winds along the coast. Periods of MVFR/IFR ceilings
are possible along the coast later this evening and overnight, but
offshore flow could limit its duration and extent. All other area
should remain VFR throughout the next 24 hours, although some
pockets of MVFR/IFR in fog or low stratus are possible in sheltered
valleys.

&&

.PREV DISCUSSION... /Issued 239 PM PDT Mon Sep 7 2026/

KEY MESSAGES...

* A Frost Advisory has been issued for valleys and basins east of
  the Cascades on early Tuesday morning.

* Warmer and drier conditions are expected in the middle of the
  week, with peak warming on Wednesday. Area valleys and ridges
  may see easterly flow bring moderate to poor overnight
  recoveries.

* Cooler temperatures are expected to end the week and through the
  weekend. Slight rain chances are in the forecast for Douglas and
  Coos counties. Elevated winds may develop east of the Cascades.

&&

DISCUSSION...Northwest flow on the back side of an upper trough
will help to keep temperatures below normal today, with generally
clear skies across northern California and southern Oregon.
Lingering cooler air and clear skies look to allow for possible
frost development in east side valleys and basins early Tuesday
morning. Localized freezing conditions are possible in especially
cold areas, but these are not widely expected. Please see NPWMFR for
more details on this product.

Warmer and drier conditions remain in the forecast for the middle of
the week, with relatively seasonable temperatures expected for
Tuesday and Thursday. Wednesday will be the warmest day, with highs
reaching 5 to 10 degrees above normal for most areas.  This will put
coastal cities in the mid to high 70s. Most west side valleys look
to be somewhere in the 90s and parts of the Klamath River Valley
could exceed 100 degrees. To the east, Klamath and Lake counties are
forecast to be in the low to mid 80s while Modoc and eastern
Siskiyou counties could reach the high 80s. Overnight easterly flow
could bring moderate to locally poor recoveries to areas peaks and
ridgelines through the middle of the week as well.

An upper pattern change remains in the forecast on Friday as an
upper trough starts to swing over the area, with the low pressure
system within that trough moving over on Saturday and Sunday.
Temperatures drop just below normal levels on Friday, with
additional cooling on Saturday and Sunday. Depending on how deep the
trough is, elevated west to southwest winds are possible, especially
east of the Cascades. A deeper path may also allow for light
precipitation, with current model runs showing increasing confidence
for showers over North Bend and Roseburg. Even with the trend upward,
weekend precipitation chances for Coos and Douglas counties are
currently limited to 20-40%. -TAD

&&

MARINE...Updated 200 PM PDT Monday, September 7, 2026...Gusty north
winds and steep wind seas south of Port Orford will expand northward
to Cape Arago tonight, then across all of the waters Tuesday through
Tuesday night. Winds briefly diminish Wednesday. Then, gusty north
winds and steep seas may return Thursday and Friday, mainly for
areas south of Cape Blanco.

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...Frost Advisory from 3 AM to 9 AM PDT Tuesday for ORZ029>031.

CA...Frost Advisory from 3 AM to 9 AM PDT Tuesday for CAZ085.

PACIFIC COASTAL WATERS...Small Craft Advisory until 5 AM PDT
     Wednesday for PZZ356-376.

     Small Craft Advisory from 11 PM this evening to 5 AM PDT
     Wednesday for PZZ350-370.

&&

$$