Cascade Head to Florence, OR out 10 NM Marine Forecast
| Rest Of Today...Sw Wind To 5 Kt. Wind Waves Sw 1 Ft At 4 Seconds. Nw Swell 2 Ft At 9 Seconds. Widespread Dense Fog And A Chance Of Showers In The Morning, Then 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...N Wind 5 Kt. Wind Waves N 1 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. Patchy Dense Fog In The Morning. |
| Wed Night...Nw Wind 5 Kt. Wind Waves W 1 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. |
| Thu...Se Wind 5 Kt, Veering To W In The Afternoon. Wind Waves Se 1 Ft At 4 Seconds, Shifting To The W At 4 Seconds In The Afternoon. Nw Swell 3 Ft At 10 Seconds. |
| Thu Night...N Wind 5 To 10 Kt. Wind Waves N 1 Ft At 4 Seconds. Nw Swell 3 Ft At 10 Seconds. |
| Fri...N Wind 5 To 10 Kt. Wind Waves 2 Ft. Nw Swell 3 Ft. |
| Sat...Nw Wind 5 To 10 Kt. Wind Waves 2 Ft. Nw Swell 4 Ft. |
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Area Forecast Discussion National Weather Service Portland OR 858pm PDT Monday Jun 16 2025 Synopsis Onshore flow will maintain seasonable temperatures through much of the coming week. Chances for light rain return to the coast Monday night into Tuesday and inland Tuesday night into Wednesday, with very little to no measurable rain expected for most inland locations. Transitioning to a cool and showery weather pattern Friday into Saturday as a closed upper level low settles over the region and brings more substantial rain amounts to the area. .SHORT TERM...Now through Tuesday Night...Weak onshore flow through the next few days with a few shortwave troughs moving within the flow. Tonight the first shortwave will arrive which will bring a slight chance (15-30% chance) of rain - especially along the coast. Forecast simulated reflectivity shows very showery conditions so some areas may receive accumulating precipitation while others will be rain free. Accumulation will be minimal, though higher terrain along the coast will see the most with up to 0.2 inch possible. Due to a slight rain shadow effect, inland areas will stay drier. Seasonable temperatures and partly cloudy skies. With westerly flow through the column, there will be minimal change in the overall forecast. Temperatures will remain in the 70s inland, while in the upper 50s to mid-60s along the coast. Will see highs increase by a degree or two on Tuesday, but clouds through the day may dampen those temperatures slightly. The second shortwave arrives on Tuesday night into Wednesday which increases chance for rain once again. More details to follow. -Muessle Long Term Wednesday through Sunday...ECMWF (European Centre for Medium-Range Weather Forecasts) and GFS (Global Forecast System) Ensemble guidance are both in agreement that there is potential for shortwave- troughing on Wednesday. Following this trough, a stronger area of low pressure brings in heavy showers Friday through the weekend. Onshore flow will increase as pressure gradients tighten with the introduction of troughing onshore. Increasing winds, decreasing temperatures, and heavy showers will increase the probability for 0.25 inch of rain or more each day. Based on NBM ensemble guidance there is strong agreement that the probability for 0.25" of rain or more within a 24-hour period over the weekend is 40-50%, while the Coast, Coastal Range, and Cascades is 65-75%. Given the showery nature of this system, cannot rule out thunderstorms. There is currently a 15-20% chance of thunderstorms on Friday and Saturday, with the highest probability on Friday being in the Willamette Valley, and Saturday focuses on the Cascades. The initial shortwave trough will only drop maximum temperatures in the Willamette Valley about 5 degrees F, bringing temperatures from low-80s to mid-70s. Temperatures fall even farther as the stronger low pressure moves in. Highs along the Willamette valley will range from near 60s degrees F in the south Valley, to the mid-70s in the north Valley. The coast will remain "normal" in the high 50s/low 60s. -Ruhl/Muessle Marine A weak disturbance is expected to cross the region this evening, supporting a wind shift from northwesterly flow to southerly flow late this evening and through Tuesday. A westerly swell is also expected to move into the waters this evening, increasing seas from around 3 feet to around 6 ft at 10 seconds. Combined seas still look to remain 7 ft or less through the week. Winds remain southerly through Tuesday, gradually turning back to the west/northwest on Wednesday. Another disturbance arrives Monday, bringing mostly westerly winds through the weekend. ~Hall/Batz NOAA Portland OR Office: Watches - Warnings - Advisories OR...None. WA...None. PZ...None. |
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