Marine Weather Net

Cascade Head to Florence OR from 10 to 60 NM Marine Forecast


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TO 5





The Marine Weather Forecast In Detail:
PZZ275 Forecast Issued: 847 AM PDT Tue Sep 13 2022

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.
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Area Forecast Discussion
National Weather Service Portland OR
254am PDT Fri Jun 14 2024

A bit cooler today, as weakening front arrives. Unsettled weather for the weekend, with onshore flow, clouds and even showers. High pressure rebuilds offshore early next week, with dry and mild weather returning towards middle of next week.

Key Messages... - Cooler, with increasing clouds today. Chance of showers along the coast (Tillamook northward) and west Washington.

- Showers Saturday through Monday. A small chance (15-25%) of afternoon/evening thunderstorms on Sat and maybe Sun.

- High pressure builds next week, bringing dry and warm conditions back to the region later next week.

.SHORT TERM...Now through Sunday... Today is a transition day, with increasing onshore flow. This will result in cooler temperatures today, along with breezy westerly winds over the high terrain, as well as through the Columbia Gorge. A weak front offshore push onshore today, but not much in way of any precipitation, aside from a few showers along the coast.

Broad upper trough offshore and over the Gulf of Alaska will push into the Pac NW Fri night and Sat. As such, will see bit cooler air aloft, with showers increasing. But, overall, precipitation amounts not all that impressive, with most areas getting 0.10 inch or less. Given potential of breaks in the clouds on Sat, could see a few 'beefier' showers, with potential of bit more rain. Add to that, may get enough instability to support a few thunderstorms. Will maintain current forecasts, with little change.

More clouds around the region on Sat, than to continued moderate to strong onshore flow. Still, will maintain high chance of showers as upper level disturbance in the westerly flow shifts inland and over the inland Pac NW. Will keep small (15-25%) chance of thunderstorms, but bit question will be whether or not will get enough breaks in the clouds to boost low level warming, and hence any steepening of lapse rates. With more warming, better the chance of a few thunderstorms, while less sun breaks and thus less warming, the lower the potential for thunderstorms. Based on current trends, any thunderstorms likely to remain rather isolated at best on Sat. Showers decreasing Sat night.

Sunday remains to be challenging forecast. Some models still have somewhat unstable air mass over the region, supporting showers. But, more recent runs of GFS (Global Forecast System) and NAM models indicate decent potential of showers, given upper trough shifting overhead. But, does seem this potential decreasing through the day, given main upper support is swinging east of the Cascades. WIll make no big changes in forecasts, but if trends continue, Sunday could be more dry than current expected. But, still plenty of clouds and coolish.

Long Term
(Monday through Thursday)...Still have upper trough over the region on Monday, with continued showers. By Tuesday, most models (GFS, UKMET and ECMWF) show upper trough shifting well east of the Cascades. So, shower potential will end in the afternoon for most all areas except the Cascades. High pressure offshore will build again for middle of next week, bringing return of dry weather. Overall air mass will gradually warm again, with return of bit warmer than normal temperatures. Will trend to 60s along the coast, and 70s inland.

Small Craft Advisory has ended for all waters, and winds are currently near zero. Seas are currently around 5-7 ft at 11 seconds, and swells should not change much over the next few days. A weak front will bring some slightly stronger southerly winds Friday morning, and will be followed by a stronger front around midnight Friday night. This marks a return to relatively stronger, westerly winds across all waters. Seas will be slightly elevated Saturday due to this front, rising to 5 to 7 ft on Sunday, before subsiding again towards 4 to 6 ft by the start of the upcoming week. /42/JLiu

NOAA Portland OR Office: Watches - Warnings - Advisories
OR...None. WA...None. PZ...None.