Conveyor belt of warm air trying to move in
BOISE, Idaho (KBOI) —
Normally, this time of the year, we’ll see most storms move in from the Gulf of Alaska. Note the satellite picture above and you’ll see the clouds off the west coast are coming up from tropical regions. In fact, this plume of moisture is often called “The Pineapple Express”. That’s because the origin of the moisture is from near the Hawaiian Islands.
The simple translation? That is mild air. So as this moisture moves into Washington and Oregon, it’s generating a lot of rain. To the point where Flood Watches have been issued for these regions. But, by the time the storm gets to us, it is much weaker and lacking dynamics.
The forecast has changed from 24-hours ago. Yesterday, it looked like the Jet Stream would pull this moisture into southwest Idaho. But today, the models want to keep the main stream of showers closer to the Long Valley and Central Idaho. But due to the proximity of the moisture, I can’t rule out the possibility of at least some showers in the Treasure Valley. The mountains should see about 2-5” of snow above 5,000’ through Friday. Here in the valley? If we do see any showers, they’ll likely be a rain/snow mix or worse yet, freezing rain. Please be on the lookout for that. It doesn’t take much to make for a slippery commute.
By Saturday afternoon, the moisture will move away as high pressure builds in. That means we’ll see dry weather on New Year’s Eve and New Year’s Day.
It might be a little chilly, but it will be dry for sure. Enjoy!