Wednesday, Dec. 9th – Lincoln County
Summary: Strong winds and heavy rain pummeled our area again yesterday.
Past 24 Hours High/Low/Gust/Rain/Total…
Lincoln City: 59F/53F/60mph/1.56”/7.04”
Depoe Bay: 58F/52F/51mph/1.16”/6.13”
Forecast: Showers and breezy today, rain possibly heavy at times tonight through tomorrow with wind gusts near 40 mph and up to another two inches of precipitation. Outlook is for showers on Friday, heavy rain and windy on Saturday, then showers likely through Tuesday. Seasonal temperatures with highs of 50-55F and lows of 40-45F are projected all week.
NOTE: The local Warnings, Watches and Advisories now in effect will again consume the rest of today’s report. Those traveling away from the Central Coast can expect continuing rain, flooded roads in spots and landslides throughout Northwest Oregon (see story below) with several inches of snow in the Cascade passes over the next couple of days; carry chains or traction tires.
The Flood Warning continues for the Siletz River at Siletz. At 5:00am this morning the stage was 15.6 feet/18100 cfs. Flood stage is 16.0 feet and flood flow is 19000 cfs. Minor flooding is forecast. The river is forecast to rise above flood stage around 9:00am and is expected to crest at 16.1 feet around 10:00am. Above 16 feet, expect minor lowland flooding and minor flooding of some structures and roads along the Siletz river. Flooding may be exacerbated during high tide. For the latest river conditions, go here.
The Flood Watch continues for most of Northwestern Oregon through Thursday afternoon. Rainfall totals tonight through Wednesday morning are expected to be 2-6 inches in the Coast Range and and 1-2.5 inches in the Willamette Valley and I-5 corridor. Flooding will continue on many Northwest Oregon rivers. Faster responding rivers that crested Monday had receded earlier on Tuesday but now are rising again. Other rivers that have not yet reach flood stage could yet reach flood stage. The mainstem Willamette will run high through the week and minor flooding is possible along some reaches between Salem and Oregon City.
Landslides and debris flows are possible during this flood event. There have already been serious rockslides and landslides this week, and soils are very saturated. People, structures and roads located below steep slopes, in canyons and near the mouths of canyons may be at serious risk from rapidly moving landslides.
A Coastal Flood Advisory remains in effect until 1:00pm today for the Central Oregon Coast.
A Coastal Flood Warning remains in effect from 9:00am Thursday morning through 3:00am Friday morning for the Central Oregon Coast.
A Coastal Flood Watch is now in effect from late Thursday night through Friday afternoon for the Central Oregon Coast.
Tidal overflow is expected. Tides will run about 1 to 2 feet above the astronomical predicted values this week. The highest tides of the cycle will occur around noon to 2:00pm today through Friday, increasing a little each day. Rivers will be running high through Thursday and will contribute to flooding. Tidal overflow impacts include flooding of low-lying areas and some roads prone to tidal flooding can be expected to be covered with water an hour or two before and after the highest tides.
Confidence has increased with timing of incoming high waves with seas around 30 feet arriving near the high tide Thursday. There is far less confidence regarding the seas on Friday but there is still significant potential.
Extremely dangerous breakers of 30-40 feet may impact the beaches. Under these conditions, destructive waves will wash over beaches, jetties and coastal structures. It is extremely dangerous to venture near the surf zone or onto jetties during these conditions as debris and logs will likely be thrown far onshore. Significant beach erosion will also be possible. A storm surge of 1 to 2 feet will contribute to higher than normal tides. The main flooding would occur around the times of the high tides:
12/09 Wed 10:24 AM 8.91′ High
12/10 Thu 11:01 AM 9.11′ High
12/11 Fri 11:38 AM 9.23′ High
Businesses and residents in and near the surf zone, and also near bays and estuaries, should be alert for the possibility of flooding and very high water surging inland and inundating normally dry areas by taking precautions.
A Coastal Flood Warning means that conditions favorable for flooding are expected to develop. Coastal residents in the warned are should be alert for rising water and take appropriate action to protect life and property.
A Gale Warning is in effect for offshore waters this morning for SW winds 25-30 knots gusting 40 with very rough combined seas of 20 feet at 12 seconds. A Storm Watch is in effect from this evening through Thursday afternoon for SW winds increasing to 30-40 knots gusting 50 and extreme combined seas of 30-35 feet at 15 seconds. Strong winds and huge seas are expected to continue through the weekend. Always check the latest Marine Forecast and Bar Reports before you attempt to venture offshore.