Overview
- Rainfall of 25–50 mm is forecast for much of coastal Washington and Oregon through early Monday, with 50–100 mm possible on windward slopes of the Olympics and northern Cascades, according to the WPC.
- The Weather Prediction Center has a marginal excessive-rainfall risk in place for the Olympic Peninsula tied to the initial surge.
- The Climate Prediction Center flags a moderate risk of high winds along the Washington and Oregon coasts and a moderate risk for heavy snow over the Cascades.
- Forecast solutions range from a brief AR1 event with peak IVT near 677 kg m⁻¹ s⁻¹ to a stronger, longer AR3 episode with IVT up to 838 kg m⁻¹ s⁻¹.
- A second round is possible next week, with CW3E showing a 60–70% chance of IVT above 250 kg m⁻¹ s⁻¹ around Wednesday and the CPC indicating a 60–70% chance of above-normal precipitation for Oct. 23–29.