Area Forecast Discussions are the real forecasts, written 3 to 4 times daily by NWS meteorologists reading the models and interpreting what they mean for your area. They offer far deeper insight than any weather app, but they're written in dense meteorological shorthand. Plaincast uses Anthropic's Claude to summarize them into plain English, side by side with the annotated original.
Area Forecast Discussion · National Weather Service Portland (PQR) · issued Thursday, July 16 at 2:24 PM PDT.
Revised in 9 passages since the 11:05 AM discussion. See every revision.
Synopsis
Warm and drier conditions return to the region through the weekend and into the middle of next week. Daytime highs expected to reach into the low 90s by the start of next week, which will result in pockets of Moderate HeatRisk across the forecast area. No significant precipitation currently in the forecast through at least the middle of next week.
Short Term
Tonight through Sunday. The low which brought showers and thunderstorms through the early afternoon will continue moving northward. This will result in showers continuing to slowly move northward through the remainder of the day. In the wake of the low, cooler temperatures and widespread cloud cover will persist, but this will be rather short lived as a broad area of high pressure, will slowly build into the region from the Great Basin through the weekend and into the start of next week. Daytime highs on Friday will be in the upper 70s to low 80s for inland valleys, low to upper 60s along the coast and low to upper 70s for the Cascades. Expect daytime highs to increase by 2-4 degrees F each day on Saturday and Sunday. /42
Long Term
Monday through Wednesday. Looking towards next week, model ensembles remain in good agreement. WPC 500mb Clusters show high pressure continuing to build over the Great Basin and push into the Pac NW through the middle of next week. As a result, daytime highs are expected to warm into the low 90s on Tuesday and Wednesday. The the blend-of-models forecast has tightened up on the temperature spread with every subsequent run over the past 48 hours. Monday through Wednesday look to be fairly similar with most areas inland locations having a 45-65% probability of reaching at least 90 degrees F and a 15-30% probability of reaching 95 degrees F or higher. While daytime highs in the 90s are not an unusual occurrence in mid to late July, that does not negate the potential for impacts from heat. So, for the start of next week, the current forecast does have areas of Moderate HeatRisk. Overall, expect warm and dry conditions for the start of next week. /42
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