11/25 Mt. Hood sun, Gorge wind and other stuff

Posted by
 November 25, 2012

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Mt. Hood Snow Forecast – 5000′
4a-8a 8a-12p 12p-4p 4p-8p 8p-4a

In Gorge weather, there should be some sun today, despite a broken inversion cloud this morning. It looks like there will be a low inversion cloud tomorrow at 500-1000′, but it too should break by afternoon. The temperature inversion won’t disappear with the clouds; it’s going to be cold in the Gorge today, tomorrow and Tuesday. There will also be building easterlies. By late this afternoon, east wind will be 26-30 in Stevenson and at Rooster. Tomorrow brings sub-freezing easterlies at 40+, and Tuesday sees another round of 26-30 at sub-freezing temps.

Today will be clear and cold on the mountain, with the freezing level at 1000′. Wind will be light and variable. The snow will be hard, but the sun will be lovely.

A big temperature inversion develops tonight, with temps above 1000′ slowly warming up. Although it will be below freezing in the Gorge Monday, it will be a few degrees C above freezing from 1000′-11,000′ by Monday afternoon. Skies should be clear in the morning, with some high clouds moving in late. Wind on Monday will be SW 10-15 early, becoming SSW 15 in the afternoon.

Tuesday starts off with high clouds and another inversion, with the free air freezing level (FAF) at 10,000′ and the Gorge below freezing. In other words, it’s going to be warm on Mt. Hood, probably around 40 degrees, with sunshine possible, but high clouds likely. The FAF level will drop to 8000′ in the afternoon. The wind will be SW 15-20 early, picking up to 20-25 in the late afternoon. The inversion should break with surface temps warming above freezing at some point overnight.

Wednesday starts off cloudy, but rain starts around 10am. The freezing level will be 8000′ early, dropping to 6000′-6500′ by 10am. It won’t drop any more until the end of the precip around 7pm, at which point the freezing level drops to 5000′. There will be around .4” of rain between 10am and 4pm, followed by a trace of snow overnight. Wind will be SSW 20-30 early, rising to 30-40 by 10am and 45-50 by 4pm.

Thursday and Friday both look warm and wet, as a deep, powerful low pressure system in the Gulf of Alaska area sends warm, wet, southerly flow over the Northwest with the snow level above 5000′. Rainfall total over that 48 hour period will be 2” or so. At this point, it looks like the rain will switch to snow late Friday night, for possible new snow on Saturday morning. Maybe. It’s a long ways out.

Have an awesome day today!