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StormTracker 9 Forecast: Potential 'Bomb Cyclone' to affect holiday travel

Our StormTracker 9 meteorologists are tracking a potential 'meteorological bomb' for Tuesday

Posted: Nov 25, 2019 10:37 AM
Updated: May 3, 2021 10:42 AM

EUGENE, Ore. -- It’s the proverbial calm before the storm. Monday morning started with showers along the coast and in the valleys, while the passes saw about 2 to 3 inches of snow overnight. There will be another 2 to 3 inches in the Cascades through this evening, with snow levels between 2,500 to 3,000 feet. Chain requirements are in place for pass travel.

Fast Forecast:

Monday: Showers. Snow level 3,000 ft, dropping to 2,500 ft overnight. Highs in mid 40s
Tuesday: Showers. Snow level 1,500 ft, dropping near valley floor overnight. Highs in low 40s
Wednesday: Isolated morning snow showers. Snow level 500 ft. Highs in upper 30s
Thanksgiving: Mostly sunny. Highs in upper 30s
Black Friday: Sunny. Highs in upper 30s
Saturday: Mostly sunny. Highs in upper 30s
Sunday: Iso. showers. Snow level 2,000 ft. Highs near 40

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Showers are expected to decrease tonight ahead of Tuesday’s storm. The long-awaited storm will arrive on Tuesday morning, pushing ashore between Crescent City, California, and Cape Blanco, Oregon. This storm is what meteorologists call a “Meteorological Bomb” or “Bomb Cyclone.” This is because the atmospheric pressure drops at least 24mb in 24 hours. This rapid drop in atmospheric pressure causes “explosive,” rapid strengthening.

Rain is expected to increase into Tuesday afternoon, with the heaviest rain Lane County and southward. Current model projections have between 0.5 and 0.75 inches of rain.

As for snow, levels are expected to drop to between 1,000 to 1,500 feet by late afternoon Tuesday. As the storm moves onshore, arctic air will be moving into the region. This cold air will drop the snow level to near to the valley floor during Tuesday evening. Model projection have about 1 to 2 inches falling south of Albany to Eugene. Roseburg will also likely see 1 to 2 inches as well. The coast range and foothills are expected to receive 3 to 6 inches. The Cascades will the heaviest accumulations in the area. That is where 12 to 20 inches are possible. The greatest amounts will be near Willamette Pass.

The other factor in this storm is wind along the southern Oregon coastline. High Wind Warnings are in place for Douglas, Coos, and Curry counties' coast. This is where near-hurricane-force gusts are possible. Model projections suggest as high as 80 mph gusts are possible. The strongest gusts will remain off the coast. Those could result to as high as 100+ mph.

Scattered snows could linger into early Wednesday morning as the storm starts to push out of our area. Behind the storm, very cold air will remain in place. High temperatures on Wednesday through Sunday are expected to be in the 30s, with overnight lows in the 20s. It would not be surprising if the Cascades dropped into the single digits.

For more information, visit the KEZI 9 News StormTracker 9 weather page.

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