Cascade Head to Florence OR from 10 to 60 NM Marine Forecast
| Rest Of Today...S Wind To 5 Kt. Wind Waves S 1 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. Widespread Dense Fog In The Morning. Areas Of Dense Fog In The Afternoon. |
| Tonight...N Wind To 5 Kt. Wind Waves N 1 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. Areas Of Dense Fog In The Evening. Patchy Dense Fog After Midnight. |
| Wed...Ne Wind 5 Kt, Backing To Nw To 5 Kt In The Afternoon. Wind Waves Ne 1 Ft At 4 Seconds, Shifting To The Nw At 4 Seconds In The Afternoon. Nw Swell 3 Ft At 9 Seconds. Patchy Dense Fog In The Morning. |
| Wed Night...Nw Wind 5 Kt, Backing To Se After Midnight. Wind Waves Nw 1 Ft At 4 Seconds, Shifting To The Se At 4 Seconds After Midnight. Nw Swell 3 Ft At 9 Seconds. |
| Thu...S Wind 5 Kt. Wind Waves S 1 Ft At 4 Seconds. Nw Swell 3 Ft At 10 Seconds. |
| Thu Night...N Wind 5 To 10 Kt. Wind Waves N 2 Ft At 4 Seconds. Nw Swell 3 Ft At 10 Seconds. |
| Fri...N Wind 5 To 10 Kt. Wind Waves 2 Ft. Nw Swell 4 Ft. |
| Sat...Nw Wind 5 To 10 Kt. Wind Waves 2 Ft. Nw Swell 4 Ft. |
| Area Forecast Discussion National Weather Service Portland OR 116pm PST Sunday Nov 9 2025 Synopsis Dry weather will give way to a weak shortwave trough, that will bring very light rain across the CWA (County Warning Area) tonight into Monday. High pressure briefly returns on Tuesday, which will bring about a short period of dry weather. A series of lows will start to impact the region on Wednesday. These systems will bring about widespread precipitation and colder air. Snow levels expected to drop towards 4000 ft late Thursday/early Friday, which will bring fresh snow to the Cascades for the latter part of this week. Tonight through Sunday...The upper level ridge, which has been keep the CWA dry this weekend as well as easterly winds through the Columbia River Gorge will slowly flatten as a weak, shortwave trough moves across the Pac NW late tonight through Monday. High pressure briefly returns on Tuesday which will bring warm and dry conditions. However, a significant pattern change is on the horizon as a series of systems are expected to bring widespread precipitation, onshore flow and cooler temperatures through next Sunday. Tonight, easterly winds will continue to slowly subside through the overnight hours. Current observations have easterly gusts at KTTD (Troutdale) around 30-35 mph with gusts of 40-50 mph at exposed ridgetops within the Columbia River Gorge (Three Corner Rock, Crown Point/Vista House). As the ridge of high pressure weakens, the pressure gradient from Portland International Airport to The Dalles (KPDX- KDLS) will gradually ease towards -3 to -5 mb tonight. As these pressure gradients ease, easterly winds will also weaken through the Gorge and along the coast, with more southerly winds expected late tonight. Late tonight into Monday, a shortwave trough pushes into southern British Columbia and far northwest Washington. High-res ensemble guidance suggests that the front associated with this upper level shortwave will be very weak as it quickly brushes our CWA. This scenario is shaping up to be a mod/high Probability of Precipitation event with low Quantitative Precipitation Forecast. There is high confidence (70-80%) that 24-36 hour rain amounts starting 8pm Sunday will remain less than 0.10" for most places. Currently, the highest chances for rain are along the coast and southwest Washington (50-70%) as this weak front is tracking further north, while chances for rain are lower (15-30%) across interior northwest Oregon. Tuesday, another shortwave upper level ridge builds over the Pacific Northwest and will bring a brief return of dry weather. However, by Wednesday, the first in a series of robust lows will take aim at the Pac NW. This stronger system will bring rain and cooler air back into the forecast. The first system will bring widespread rain across the CWA Wednesday through Thursday with the mean precipitation total across the CWA between 0.30-1.30" with higher totals along the coast, the 90th percentile range from 0.80-2.50" and the 10th percentile range from Trace to 0.30 inches. As this first system pushes eastward, it will bring cooler temperatures into the region. Models have 850 mb temperatures dropping towards -1 to -3 C, which will result in snow levels falling towards to pass-level in the Cascades Thursday evening/ Friday. Mean precipitation totals for low elevation, inland locations from Friday afternoon through Saturday afternoon is between 0.30-0.75" with higher totals along the coast, the 90th percentile range from 0.70-2.00" and the 10th percentile range from Trace to 0.15 inches. Current guidance also suggests a 40-60% chance that 48-hour snow totals between 10pm Thursday to 10pm Saturday exceeds 6 inches through the passes, with the highest chances at the Santiam and Willamette Passes. As Saturday approaches, warmer air will be introduced as the next system moves into the region and this will result in continued, widespread precipitation through the remainder of the weekend and into Sunday. /42 Marine A weak frontal system approaching the waters Sunday afternoon has shifted winds southerly. Winds generally expected to remain below 15 kts with gusts below 20 kts as the front passes through the waters tonight except for the outer waters beyond 30 NM in zone PZZ271 where wind gusts could briefly reach 21-25 kts through 8pm PST. Seas will generally remain 6-9 ft at 10-12 seconds in Monday. Wind direction varies through the first half of next week, but wind speeds look to remain at 5-10 kt through Tuesday night. There is also high confidence (greater than 95% chance) that seas remain below 10 ft through midweek as well. An area of low pressure strengthening well offshore will return breezy southerly winds and building seas Wednesday into Thursday, increasing the chances (60-80% chance) for another period of conditions hazardous to small craft. There is also a 40-70% chance for Gale- force wind gusts greater than 34 kt during this period, with the highest chances across the outer waters beyond 20-30 NM. -10/36 NOAA Portland OR Office: Watches - Warnings - Advisories OR...None. WA...None. PZ...Small Craft Advisory from 4pm this afternoon to 10pm PST this evening for PZZ210. |
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