Florence OR to Point St. George between 150 and 250 NM Offshore Forecast
|Today...E To Ne Winds 10 To 20 Kt. Seas 7 To 12 Ft.|
|Tonight...E To Ne Winds 10 To 20 Kt, Becoming N To Ne 5 To 15 Kt. Seas 5 To 9 Ft.|
|Wed...Variable Winds 5 To 15 Kt, Becoming S To Sw 10 To 20 Kt. Seas 5 To 9 Ft.|
|Wed Night...S Winds 10 To 20 Kt, Becoming Nw. Seas 8 To 14 Ft. Chance Of Rain.|
|Thu...N To Nw Winds 10 To 20 Kt, Becoming Variable Less Than 10 Kt. Seas 11 To 14 Ft.|
|Thu Night...Variable Winds 5 To 15 Kt, Becoming S To Se 10 To 20 Kt. Seas 10 To 12 Ft.|
|Fri...S Winds 10 To 20 Kt. Seas 8 To 10 Ft.|
|Fri Night...S Winds 15 To 25 Kt. Seas 7 To 10 Ft.|
|Sat...S To Sw Winds 20 To 30 Kt. Seas 6 To 11 Ft.|
|Sat Night...Nw Winds 15 To 25 Kt. Seas 7 To 11 Ft.|
| Area Forecast Discussion|
National Weather Service Medford OR
1036am PST Tuesday Dec 1 2020
.Updated Aviation Discussion.
01/12Z NAM in. 01/12Z GFS in through 108hr.
There are areas of low clouds and fog over the west side valleys this morning. Other than that, mostly clear skies prevail.
A strong ridge remains off the west coast this morning, with dry northwest flow aloft over the Pacific Northwest. Strong inversions over the valleys will retard clearing, and some valley locations will not clear at all today, and possibly not for several days. Meanwhile
The ridge will move slowly east and the axis will break to the east of the forecast area Wednesday and the flow aloft will become southwesterly. This will end the breezy easterly low level flow over the ridges, but the air mass will remain very dry and stable.
A short wave embedded in the southwesterly flow will approach the area Thursday, but it, and the associated surface front, will pretty much dissipate as it moves into the ridge. The ridge will rebuild thereafter, and easterly low level flow will return to the area. The dry and stable conditions will persist into the weekend.
This prolonged period of high pressure is creating conditions that will allow pollutants to accumulate. An air stagnation advisory remains in effect through Saturday morning for inland valleys. Please see the NPWMFR for details.
Updated 800am PST Tuesday 01 Dec 2020...While seas will gradually diminish today into early Wednesday morning, they will remain high and steep across the area through this afternoon and in the outer waters south of the Umpqua River. A thermal trough will briefly build along the coast today, bringing gusty northeast winds and steep wind driven seas. The steep wind driven seas will be highest in the outer waters south of Cape Blanco, not quite building to hazardous seas conditions as winds peak early this evening.
A long period west to northwest swell will arrive Wednesday morning with seas rising into Thursday afternoon. This will combine with incoming tide and a shorter period west-northwest swell at 13 seconds to bring sneaker waves...with highest risk Wednesday but a continued risk into Thursday morning. Swell dominated seas are likely to become high and steep on Wednesday night, continuing into Friday morning. -DW/BR-y
.MFR WATCHES/WARNINGS/ADVISORIES... OR...Air Stagnation Advisory from 10pm this evening to noon PST Saturday for ORZ029>031. Air Stagnation Advisory from 10pm this evening to noon PST Saturday for ORZ023>026. Beach Hazards Statement from late tonight through Thursday morning for ORZ021-022.
Pacific Coastal Waters...Small Craft Advisory until 1am PST Wednesday for PZZ370-376. Small Craft Advisory until 4pm PST this afternoon for PZZ350-356.