Downslope Wind

It’s a windy night across the metro area as our Gorge easterly wind appears to have started as a downslope wind event instead.  Massive increase in gradient this evening to around 10 millibars PDX-DLS.  That was well forecast by models.  But the sure signs of easterly downslope wind are (in my book):  1) I have east wind at my home east of Corbett, that only happens with downslope wind, usually my "east" wind comes around a hill from the northwest.  2) Brightwood has a gusty east wind.  3) Our rooftop sensor just recorded a gust to 34 mph at 10:45pm.  We only get strong east wind at KPTV at Cornell & Hwy. 26 with the downslope winds.  4)  Dewpoints lower at HIO, VUO, PDX than TTD.  If the cold/dry air was only coming out of the Gorge dewpoints shouldn’t get drier as you get AWAY from the Gorge should it?

System approaching may hang together enough for light precip west of the Cascades tomorrow…maybe not, tough call.

Splitting/ridge pattern holds through at least Sunday.  Some models have precip in here by Monday (ECMWF), but new 00z GFS is dry until Wednesday!  I’ll leave any changes to the 7 Day for Drew in the morning.   Or I could just write "Long Term…no Changes" for my NWS friends.  If the Thursday-Friday chilly 850mb temps hold in future model runs it will be cooler than what my 7 Day shows too…Mark

140 Responses to Downslope Wind

  1. jacob BPA says:

    Beware No Met on TV will go out and Say we are headed for a Artic Outbreak
    in 10 Days
    A good Met will need a good 4-5 Runs and then be 3 or so days out to call it out Because a Aric outbreak For us is something that doesnt happen every year
    Now with that said The Cold air pooling in Alaska is very impressive and alot of good things can come out of this but trhen something may not now if we continue to see the trends say come Monday then we can Start get Excited But MArk Has played it like a pro on the Extended and The Tv
    And As For What I see And think This is the Coldest air yet in Alaska This for Next Week and thats Mid Week so add 5-10 Days if it would move south to us From when its in Alaska

  2. Jordan says:

    new post

  3. Derek-West Gresham- says:

    You should have seen my forecasts even a few months ago. Trying to become much more moderate, yet still keep myself from becoming a conservative met, nobody likes those. Any friendly advice is ALWAYS welcome.

  4. sherwood says:

    Thanks derek, I appreciate your honesty on that. I didn’t mean to call you out, but I really feel that you are good enough that you can begin making forecast for the entire area…beyond just your microclimate.
    And the last thing…don’t forget that we live in the PNW and we typically don’t get extreme events. When there is the potential, don’t forgret it is just that…potential.
    Thanks again derek…keep up the good work, and continue to learn from others!

  5. Derek-West Gresham- says:

    For any who think I am extreme I want to tell you I am going to make a push to make the most accurate forecasts I can with the coming snow chance. I will try and do a multi elevation outlook with no hopes or dreams attached whatsoever, just what I think. I always do but I will avoid most of the outlying ideas, just what I think.

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