061 
FXUS66 KMFR 072139
AFDMFR

Area Forecast Discussion
National Weather Service Medford OR
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

&&

.AVIATION...07/18Z TAFs...With ceilings clear over North Bend and 
clearing over Roseburg, VFR levels should continue through much of 
the day. Gusty winds are expected along the coast this afternoon, 
then easing into the evening. Periods of MVFR or IFR ceilings are 
possible along the coast later in the evening, but offshore flow 
overnight would limit its duration. Guidance suggests development is 
possible around 05Z, but current confidence is not high enough to 
include those clouds in the North Bend TAF forecast. -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. 

&&

$$