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This is it… the last day of the Great Inversion, 2013, or at least the last day where the inversion will result in splendid weather on Mt. Hood. I just looked at the webcams, and the sunrise was gorgeous. That probably means high clouds are already moving in, so if you want sun, hurry up and get it.
In Gorge news, it’s blowing 52mph at Rooster Rock this morning, according to iWindsurf. That wind is driven by a .24 east gradient. Big, but not huge. East flow sticks around long enough tomorrow for some snow, maybe an inch, in the Gorge between 1pm and 4pm, after which we’ll go to west flow and see a switch to rain. Thursday looks dry and cool in the Gorge through 1pm, with rain starting around 4pm. Friday starts off cloudy, and a bit warmer, with temps in the low 40’s, with very heavy rain starting midday. From this far out, the weekend looks showery and cool, which is much better than inverted and gloomy.
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On Mt. Hood, high clouds move in sometime this morning. The freezing level will be 11,000′ all day. No precip. Wind will be SW 25 early, picking up to SW 30 in the afternoon.
The freezing level starts dropping overnight, going to 8,000′ at 4am, 6,000′ at 10am, 3500′ by 1pm and 1500′ by 4pm. Snow starts falling around 1pm, which means the snowpack will be cold and hard and not conducive to bonding and we’ll end up with dust on crust on the hill. Total precip will be around .4” water value (WV) between 1pm and 10pm, after which we switch to flurries. Wind will be SSW 40 early, 45-50 at 10am, W 30 at 4pm and a lift-swinging W 40 at 7pm.
Thursday looks colder, with the freezing level at 1000′ early. More on the afternoon weather in a bit. There will be flurries during the day, with no significant accumulation. Wind will be WNW 30-40 early, W 20 at 10am, SW 40 at 4pm and W 35 overnight. Now, on to the Thursday afternoon weather: at 4pm, the snow level will be 1000′, but warm, wet air will move over top, and the snow level will rise to 7000′. In between this period, there will likely be freezing rain on the mountain. Total precip between 4pm and 1am will be .3” WV, which will likely fall as ice, but may fall as a bit of snow.
On Friday, the snow level will be 6500′ early, 5500′ at 1pm and 4000′ at 7pm. Precip amounts are varying across models, but it looks like very heavy rain/snow will fall around 1pm. If it comes in as snow, we’ll be sitting pretty, with wet, heavy snow bonding to the snowpack. Wind will be SW 25 all day.
Have an awesome day today!