Portland braces for consistent rainfall this weekend, prompting concerns for potential urban flooding and elevated risks of landslides. According to the National Weather Service (NWS) in Portland, showers are expected to start tomorrow afternoon with an 80% chance of precipitation, followed by heavier downpours leading into Sunday. Temperatures will range from highs near 60 degrees to lows in the mid-40s throughout the period.
The NWS detailed forecast anticipates new precipitation amounts up to three quarters of an inch by Sunday night, increasing the likelihood of flooding across northwest Oregon and southwest Washington. With the ground already saturated and more rain on the horizon, residents in low-lying areas are advised to stay alert. Heavy rainfall may also lead to ponding of water, general lowland flooding, and localized urban flooding, especially in low-lying areas or other poor-drainage areas, the NWS statement cautioned.
Coastal rivers like the Wilson and Grays River are particularly under watch, with about a 20-25% chance of reaching minor flood stages by Sunday. The agency issued a hydrologic outlook highlighting the potential for quick-responding rivers to flood depending on where the warm front sets up. The situation, remains fluid, with possible shifts in the forecast potentially changing flood probabilities.
Those living near the Cascades should also be cautious, as the combination of heavy rainfall and recent snow accumulation could trigger landslides. The NWS has warned of an increased landslide risk, noting that heavy rainfall could also raise the potential for landslides in areas of steep terrain and debris flows in regions affected by wildfires in recent years. Citizens are urged to monitor updates on the NWS website and stay informed about any additional watches, warnings, or advisories that may be issued.
