Cape Shoalwater WA to Cascade Head OR out 10 NM Marine Forecast
| Rest Of Today...Sw Wind 5 Kt. Wind Waves Sw 1 Ft At 4 Seconds. Nw Swell 2 Ft At 9 Seconds. Widespread Dense Fog In The Morning. Areas Of Dense Fog In The Afternoon. |
| Tonight...Nw Wind To 5 Kt. Wind Waves Nw 1 Ft At 4 Seconds. Nw Swell 2 Ft At 9 Seconds. Areas Of Dense Fog In The Evening. Patchy Dense Fog After Midnight. |
| Wed...N Wind 5 To 10 Kt. Wind Waves N 1 Ft At 4 Seconds. Nw Swell 2 Ft At 9 Seconds. |
| Wed Night...N Wind 5 To 10 Kt. Wind Waves N 2 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. |
| Thu...Ne Wind To 5 Kt, Backing To Nw 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 10 Seconds. |
| Thu Night...Nw Wind 5 Kt. Wind Waves N 1 Ft At 4 Seconds. Nw Swell 3 Ft At 10 Seconds. |
| Fri...Nw 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 1000pm PDT Monday July 20 2026 Updated aviation discussion. Synopsis Ever-changing pattern this week with a warming trend on Tuesday into Wednesday. Higher confidence on Tuesday's highs being well above normal, but some level of uncertainty lies with Wednesday still as there is another potential weather pattern that would disrupt as significant of heating. Thunderstorms remain possible on Wednesday, especially over the Lane and Linn county Cascades. Cooler with onshore flow starting Thursday. .SHORT TERM...Now through Wednesday Night...Satellite imagery this afternoon shows widespread cloud cover over the region which has maintained more moderate temperatures throughout the area. Starting to see temperatures rise, but it has been a slow process. Still expecting highs in the mid to upper 80s inland, with cooler temperatures along the Coast, southwest Washington and the Cascades. Tuesday continues to be on track for a significantly warmer day as high pressure builds over the region. This ridge is going to maintain generally clear skies with light winds overnight. Night time temperatures will remain elevated, especially with the aid of cloud cover that fills in overnight. The HREF continues to show a return of southerly flow and cloud cover on Tuesday which, if combined with smoke aloft, could inhibit significant heating. This trend can be observed when comparing models. For example, the NBM is showing around 98 degrees for a high on Tuesday, while the HREF is closer to 95 degrees in Portland. While not a significant drop, it does show that there remains some wiggle room. This is further supported when looking at the probabilities. In Salem for example (also in the Heat Advisory), the temperatures in the 25th to 75th percentile range from 96-100 degrees F. There is a 10% chance that highs could reach around 101 degrees on Tuesday. The Heat Advisory remains in effect through Wednesday. Speaking of Wednesday, that is where conditions become a little be less confident. Ensembles continue to agree on a ridging pattern persisting, but where it ends up is the question. Northwest Oregon and Southwest Washington is sitting right on the outer edge of the ridge which is going to increase southerly to southwesterly flow. In addition, there is moisture in the area from a trough aloft forming off of the coast of California. This trough would disrupt the potential for another significant heating day, and instead bring higher cloud cover and even the potential for rain/thunderstorms. Right now, the trend remains warm, but more and more of the models are showing increasing convection risk. CAPE values over the Cascades are increasing, and looking at forecast soundings, a lot of that instability is aloft. If we maintain lots of cloud cover, the initiation for storms will be limited as the flow aloft is less strong than the last thunderstorm outbreak we experienced. However, if we get the cloud breaks, we could easily see these storms perk up and we could see some elevated thunderstorms. PWATs (Precipitable Waters) remain around 1 inch which is a tad lower and would lead towards a dry thunderstorm scenario. Multiple days of above normal heat combined with limited overnight relief will support widespread Moderate HeatRisk across much of the interior. The greatest concern remains centered on the Portland/Vancouver metro, the Columbia River Gorge including Hood River County, and the Kelso/Longview area, where a Heat Advisory is in effect from Tuesday morning through at least Wednesday evening. Within those areas, Major HeatRisk appears increasingly likely Tuesday and Wednesday, especially in locations that see the warmest afternoons and the least nighttime cooling. Those with outdoor plans or without effective cooling should be prepared for elevated heat impacts. So, drink plenty of fluids, stay in a cool place during the heat of the day, stay out of the sunshine, and check up on relatives and neighbors. -27 Long Term Thursday through Monday...By Thursday and Friday, the ridge is expected to weaken as a broader trough begins to press into the Pacific Northwest. That should allow temperatures to ease a few degrees late in the week, though values may still remain somewhat above average for late July. Beyond Friday, there is currently no strong signal for meaningful precipitation, and temperatures remain mild in the mid 80s. -12 Marine A typical summertime pattern will continue through the middle of this week with persistent north to northwest winds over the coastal waters. Winds then shift southwest to westerly Thursday into the weekend as weak low pressure develops over the waters. Winds will remain light less than 10-15 kts. Seas will be 3-6 ft at 8-9 seconds through the weekend. -03 NOAA Portland OR Office: Watches - Warnings - Advisories OR... Heat Advisory from 10am Tuesday to 11pm PDT Wednesday for ORZ108>115-120>122. WA... Heat Advisory from 10am Tuesday to 11pm PDT Wednesday for WAZ204>207-209-210. PZ...None. |
Portland OR Radar
Northwest Radar