Cape Shoalwater WA to Cape Lookout OR between 150 and 250 NM Offshore Forecast
| Today...N Winds 15 To 25 Kt. Seas 6 To 9 Ft. Isolated Showers With Vsby 1 Nm Or Less. |
| Tonight...N To Ne Winds 10 To 20 Kt. Seas 6 To 9 Ft. Isolated Showers. |
| Thu...N To Ne Winds 10 To 20 Kt, Becoming S To Se 5 To 15 Kt. Seas 6 To 9 Ft. Scattered Showers. |
| Thu Night...E To Ne Winds 5 To 15 Kt, Becoming Variable. Seas 7 To 8 Ft. |
| Fri...E To Se Winds 5 To 10 Kt. Seas 6 To 8 Ft. |
| Fri Night...Variable Winds Less Than 10 Kt. Seas 5 To 6 Ft. |
| Sat...Nw Winds 5 To 15 Kt, Becoming W. Seas 5 To 6 Ft. |
| Sat Night...W Winds 10 To 15 Kt, Diminishing To 5 To 10 Kt. Seas 5 To 6 Ft. |
| Sun...W Winds 5 To 10 Kt. Seas 5 To 6 Ft. |
| Sun Night...W Winds 5 To 10 Kt, Becoming Sw. Seas 5 To 6 Ft. |
| Area Forecast Discussion National Weather Service Portland OR 342am PDT Wednesday July 22 2026 Synopsis Hot and increasingly humid conditions will continue today, with another round of very warm overnight temperatures limiting recovery across the interior. Highs this afternoon will again reach the 90s for most inland locations, and a few spots may touch 100 degrees before cloud cover and convection begin to temper heating. Monsoonal moisture spreading northward will bring a rising chance of showers and thunderstorms today, especially from afternoon into evening, with the greatest risk over the Cascades. Cooler weather is then expected Thursday and beyond as onshore flow strengthens. .SHORT TERM...Now through Thursday...Two concerns today: heat and increasing convective potential. Upper ridging remains in place today, and warm overnight temperatures have once again left much of the interior with poor overnight cooling heading into the new day. That sets the stage for another hot afternoon, although the temperature forecast is more complicated due to increasing mid and high level moisture advancing northward. For the heat portion of the forecast, inland locations remain on track to climb well into the 90s again today, with the warmest interior valleys having at least some chance to reach the upper 90s to near 100 degrees (notably around the Portland/Vancouver metro). The exact max temperature today will depend in part on how quickly cloud cover increases and how much sunshine can be maintained into the afternoon. Even if highs end up a few degrees lower than peak potential, the added humidity will make conditions feel more oppressive than on previous days. A Heat Advisory remains in effect through this evening for much of the interior lowlands, including the Portland/Vancouver Metro, the Columbia River Gorge include Hood River County, Kelso/Longview, and portions of the south Washington Cascades. Major HeatRisk remains a concern for much of the Willamette Valley, especially where overnight temperatures stay elevated and afternoon heat builds before storms develop. The more active part of the forecast arrives later today as monsoonal moisture and an offshore low work together to destabilize the atmosphere. Guidance continues to suggest that at least isolated convection could begin as early as 11am this morning in a few locations, but confidence is notably greater in development from 1pm this afternoon to 7pm this evening when daytime heating can maximize instability. The favored area for thunderstorm development continues to be the Lane and Linn County Cascades and nearby Willamette National Forest, though a few storms could develop farther west as well if sufficient breaks in cloud cover allow instability to build. This is reflected in the latest Storm Prediction Center convective outlook, which depicts a general thunderstorm risk across much of southwest Washington and northwest Oregon, with a marginal risk focused over the Oregon Cascades. It is critical that if you hear thunder or see lightning that you take cover immediately inside of a sturdy structure, get off of the water, and limit outdoor activities. Forecast soundings and convective guidance continue to support an environment capable of thunderstorms, with elevated instability in place and precipitable water (PWAT) values around 1.2 to 1.5 inches. While that amount of moisture could support pockets of locally heavier rainfall, relatively dry air in the lower levels may reduce rainfall efficiency in some locations. While lightning remains the primary concern, locally gusty and erratic winds may accompany any stronger storms, especially near the Cascades. A more scattered thunderstorm scenario cannot be ruled out this afternoon and evening, particularly over the higher terrain. Showers and thunderstorms may linger into tonight, though coverage and intensity should gradually diminish after sunset as surface-based instability weakens. A few showers could persist into Thursday morning before the broader pattern begins to shift. Long Term Thursday Night through Tuesday...By late Thursday into Friday, upper ridging will weaken while a broader trough moves toward the Pacific Northwest. This will allow onshore flow to re-establish itself and bring a more noticeable cooling trend late this week, along with a return to more marine influence and night/morning cloud cover. Confidence is moderate to high in the overall cooling trend, though lower in the exact day-today temperatures. Temperatures should remain somewhat above seasonal averages Thursday and Friday, but well below the temperatures reached earlier in the week, with improved overnight recovery as well. Looking into the weekend and early next week, temperatures appear likely to settle back into the upper 70s to lower 80s inland, with no strong signal for meaningful precipitation after Friday, though light shower chances may linger Saturday along the north Oregon and south Washington coast. ~12 Marine North to northwest winds over the coastal waters will shift to west to southwesterly late today and through 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. Today, there is a chance for showers and thunderstorms across all of the waters through the majority of the day and overnight hours. There could be frequent lightning and gusty and erratic winds with any thunderstorm that forms. ~12/03 Climate Daily record high minimum temperatures for July 22 Astoria 62 (2007) Vancouver, WA 74 (2006) Portland Int'l 74 (2006) Hillsboro 73 (2006) McMinnville 73 (2006) Salem 74 (2006) Eugene 71 (2006) Daily record high maximum temperatures for July 22 Astoria 88 (1891) Vancouver, WA 98 (1928) Portland Int'l 98 (1978, 2004) Hillsboro 103 (1938) McMinnville 102 (1928) Salem 102 (1928, 1978) Eugene 101 (2006) NOAA Portland OR Office: Watches - Warnings - Advisories OR... Heat Advisory until 11pm PDT this evening for ORZ108>115- 120>122. WA... Heat Advisory until 11pm PDT this evening for WAZ204>210. PZ...None. |
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