Local Weather Alert

Special Weather Statement for Cascades In Lane County, OR

Issued by The National Weather Service Portland, OR

Locally heavy rainfall possible over Northwest Oregon and Southwest Washington through early Friday.

A deep upper level low pressure system offshore will slowly move through the area over the next few days. expect another round of localized overnight showers and thunderstorms tonight. more widespread shower and thunderstorm activity becomes possible as the low pressure system moves inland on Thursday.

The most likely period of heavier showers looks to be Thursday afternoon into early Friday. there is considerable uncertainty as to where the heaviest rain may fall. at this time... it appears that widespread rainfall amounts of 0.25 to 0.5 inches are expected in the Northwest Oregon valleys and foothills... with localized amounts in excess of 1 inch in any thunderstorms. up to 2 inches or slightly more could occur in the Southwest Washington cascades... 1.5 inches in the Oregon Cascades. the lightest amounts are expected south and west of Salem.

Excessive rainfall rates can overwhelm storm drainage in urban areas... leading to urban flooding. this can also result in flooding of small streams.

Since weather conditions in these situations can evolve quickly and it is difficult to pinpoint heaviest rainfall areas... people across Northwest Oregon and Southwest Washington are urged to stay tuned to latest forecasts and updates.