AccuWeather has issued a warning for heavy rain and flooding concerns across western Washington and southwestern British Columbia, effective through Friday. This weather event is being driven by moisture from a Hawaii-connected atmospheric river.

Forecasts indicate that most lower elevations in the affected regions can expect rainfall between 1-4 inches. In contrast, west- and southwest-facing slopes of the Coast Mountains, Olympics, and Cascades may see significantly higher totals, with predictions of 4-8 inches of rain.

In some areas, an AccuWeather Local StormMax™ of 13 inches is anticipated, raising concerns about moderate to major flooding along several rivers in northwestern Washington and southwestern British Columbia.

In addition to the rain, a Heat Advisory remains in effect until 8 p.m. Friday in the Bay Area, where afternoon highs are expected to soar well above average, reaching the low 80s to mid 90s under sunny skies.

Morning temperatures in the Bay Area are forecasted to be in the 50s and 60s, providing a stark contrast to the anticipated afternoon heat. However, with the arrival of spring on Friday, temperatures are expected to drop near the coast, offering some relief from the heat this weekend.

This unusual weather pattern is being fueled in part by a strong heat dome over the southwestern United States, which has contributed to the current conditions.

As the situation develops, officials and residents are urged to stay informed about the changing weather and potential flooding risks.

Details remain unconfirmed regarding the exact timing and intensity of the rainfall, but the forecasts indicate a significant impact on the region.