Slow Friday Night

SnapshotThe rain showed up a bit earlier than expected tonight; that along with the cloud cover soon after the noon hour kept our highs below 60 degrees.  Oh well, the one thing I like about weather forecasting is that you start over each day…a brand new forecast.  So hopefully this weekend’s forecast will work out a bit better.  A classic orographic lifting rainfall pattern this evening.  Notice only a trace or so west side, but up to 1/3rd inch on the east side.  The westerly flow runs into the Cascade foothills and drops some of it’s moisture as it begins rising.  That’s why the Coast Range and west slopes of the Cascades are considered a temperature rain forest.  Another reason ferns grow ON the moss that grows ON the trees up there.
Most rainfall tomorrow should be with the cold front in the late afternoon and evening.  Most notable for people like me that want to get outside at some point is the quick cutoff of the rainfall behind the front.  Other than a possible "pop-up" shower Sunday afternoon, it should be dry from around midnight Saturday night to sometime Monday night or Tuesday…Mark

64 Responses to Slow Friday Night

  1. Camas Mom says:

    Snow on Larch Mtn above us. Pretty!

  2. AtmosphericWrath -Southeast Portland- says:

    South wind sure is increasing in response to that little low just off of Astoria or so.
    It’s deepening a little.
    Wind here is 15-30mph
    I’m in Chat.
    Rob

  3. The showers completely skipped my location this morning! I saw the line of heavy stuff coming up the valley from south to north, and they split right apart over my side of Gresham. I’ve noticed that in the summer, severe thunderstorms coming up directly from the south tend to split over me, and converge again to my north. Weird stuff. By the way – I would probably call this afternoon’s rain just a steady band of rain coming through.

  4. Derek-West Gresham says:

    We didnt get enough sunlight but even without it we have had some nice showers today.

  5. AtmosphericWrath -Southeast Portland- says:

    We need to develop sun breaks in a hurry if we want convection this afternoon-early evening.
    Good southerly flow with a few vorticity lobes rotating northward.
    There is adequate cold air aloft so we might see some hail/isolated t-storms later, but certainly nothing fun(severe)IF we can develop some clearing.
    If not, then just expect this overcast with light-moderate showers possible.
    Rob

  6. Sean (Lebanon, Indiana) says:

    Nothing but a heavy rain shower at best..

  7. Jesse says:

    Those showers moving up from the south look pretty heavy, interesting. Only 48 in Vancouver now though, 50 at PDX, seems kind of chilly for a “pre-thunderstorm” temp but I guess if the temps in the upper atmosphere are really cold I could be wrong. I’m leaving for work right now and will be there until 9pm so if there is any action hopefully it will be during my lunch hour 🙂

  8. Looks like showers and maybe storms are moving up the valley right now – should be in Portland area shortly.

  9. Sean (Lebanon, Indiana) says:

    Derek – To check out the CAPE and other parameters here you go.
    http://www.rap.ucar.edu/weather/model/index.php?model=eta
    Not seeing any CAPE in the NW, as far as N. California looks the SBCAPE will be about 500 at most. Wouldn’t be surprised to see a tornado or two down there tomorrow. I would say, that it’s pretty early in the season to see a SLGT risk area west of the rockies.
    The weather has just been delightful the last few days and looks to continue for the week. Hit 81 yesterday and forecasts call for temps around 80 or so thru about Thur/Friday when the system out west should move through here. I think that will be our first real taste of severe weather this season, which so far has been pretty quiet for the most part.

  10. Derek-West Gresham says:

    BTW SPC has us on borderline convection chance with a severe thunderstorm threat in Northern California tomorrow.

  11. Derek-West Gresham says:

    I hope I am not grasping at a few too many straws, just cause I want it to storm. LOL

  12. Derek-West Gresham says:

    http://weather.unisys.com/upper_air/skew/skew_KSLE.html
    Make sure all of you view the Scew-T chart tomorrow morning to see how the atmosphere is looking. Its good to note there is some dry air advecting into the mid levels along with decently cool air, but the PBL (surface) will be pretty warm and hopefully moist.

  13. Derek-West Gresham says:

    Tomorrow looks like there will be some very strong lapse rates. There is pretty decent cold air aloft, with -2 850mb temps, yet its near 60 at the surface. We will have this again tomorrow, plus a kicker to jump start some action I hope.

  14. Robert in Vancouver says:

    Wow Mark! The Low in the 7 day forcast for Sunday is 4,545 degrees! Talk about global warming!!! El Nino here we come! 😉
    Robert in Vancouver

  15. jake says:

    Whats the snow forcast look like for mt hood this week im ganan be up that way

  16. Derek-West Gresham says:


    LI near 0, good vertical shear and I think they call it vertical volocity..anyway looks to increase with height. Moisture will lift at the cascades and roll into Portland tomorrow evening. It will be marginal instability but I will take it. The PBL will become much warmer and allow for instability if we can get even a few hours of morning sunshine. Anybody have a link so I can check out what the CAPE is progged to be?

  17. Derek-West Gresham says:

    Rob, I have been watching our little storm threat for days. I have a feeling something is going to creep up the cascades tomorrow afternoon, lets hope it hits us.

  18. AtmosphericWrath -Southeast Portland- says:

    Back to the weather…
    Look at the radar over west/sw Texas.
    Looks like potentially very serious flooding from Odessa to Lubbock.
    http://www.wunderground.com/radar/radblast.asp?ID=MAF&lat=0&lon=0&label=you&type=N0R&zoommode=pan&map.x=400&map.y=240&centerx=437&centery=352&prevzoom=zoom&num=1&delay=15&scale=0.558&noclutter=0&showstorms=0&showlabels=1&rainsnow=0&lightning=0
    Also if you ever get bored and want to view this area 1st hand check out this link.
    http://www.basinbroadband.com/webcam/
    Live streaming cams from Seminole, Texas (Which is experiencing very heavy storms can’t hardly see the cam Lol), Hobbs, New Mexico, and Midland, Texas.
    Rob

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