Spots of Ice Metro Area Wednesday AM

9:30pm Tuesday…

OVERNIGHT

This cold episode has just about played itself out in the metro area.  The cold air layer is quite thin, so I’m thinking it’s going to be tough to get precipitation in the form of snow as all models show warming above about 2,000′ during the night.  Most (light) showers should be in the form of sleet (ice pellets) or liquid rain.  So of course to get freezing rain you have to get surface temperatures below freezing.  Note the current temps:

2017 Current Temps PDX Metro Area Earth Scene

Thick cloud cover has moved in, stalling metro area temperatures right around the freezing mark.   We’re not going to see any significant additional drop.

The flow of cold/dry air out of the Gorge has weakened dramatically.  Only 3+ millibars PDX-DLS is not typical ice storm material for us.  It’s just a breeze from the east right now even in the usual windy spots; evidence the cold pool is shrinking and turning shallower eastside.

Dewpoints have also risen a bit, so if/when precipitation arrives, temperatures will only fall maybe 1-2 degrees with evaporative cooling.

That means almost none of us drop below 30 degrees.  Which leads me to believe that most roads which are thawed right now are unlikely to re-freeze tonight.  Freezing rain typically needs air temps down to 30 to get new ice on roads that aren’t already frozen.

SUMMARY

  1. It’s doubtful we see a widespread icing of already-thawed roads in the metro area
  2. There may be a few new spots of icing, but the main highways/freeways WEST of I-205 and south of Milwaukie/Happy Valley should be clear tomorrow morning.
  3. Frozen roads in the hills and east metro will remain that way through the morning commute.

We continue the slow thaw tomorrow with almost all roads in decent shape by late afternoon, still some ice east of I-205 though.

South wind arrives Thursday afternoon/night.  Until that time no dramatic warmup, just a slow thaw.  We should be around 50 by late Thursday evening.

Chief Meteorologist Mark Nelsen

 

18 Responses to Spots of Ice Metro Area Wednesday AM

  1. Nahtalkin says:

    I think Marylyn Deutch tells a fantastic tale most every day, I sure enjoyed the one today about the stand off in Fairview!

  2. Ken in Wood Village says:

    Well, the 12Z GFS looks interesting around the 7th. I have noticed the EURO starts giving us cooler weather around the same time. It’s a long ways out there but it’s interesting to see.

    On a side note, I have that damn flu. Keep healthy everyone. Maybe we will see some more snow this season 🙂

  3. W7ENK says:

    39°F with light drizzle at the house when I left for work this morning. Roads are just wet, no ice to be found at all not even in the (daytime) shady spots. MAX was running on schedule and without any issues. Seems like a bust to me, which is fine. I don’t like ZR ice!

    Came through Christmas Eve with the following:
    1/10″ Sleet
    3/4″ Snow
    1/8″ ZR
    0.46″ liquid precip.

    Another 1/8″ ZR on Christmas Day (before sunrise)
    with 0.14″ liquid precip.

  4. Light fog, sky completely obscured (probably overcast above the fog) and 32°F this morning. Cold enough to snow if there was any moisture falling from the sky, but there isn’t any (and the radar doesn’t show any coming my way). Not a complete surprise; the models were saying the moisture was very limited and not a sure thing with this one.

  5. Andrew says:

    Anything notable in longer term models to suggest snow/ice? I noticed that the warmup quickly gives way to cooler, dry weather like we experienced leading into this last “storm.”

    • Ken in Wood Village says:

      It looks like we will have a few warm days on Thursday & Friday. I see on the models after the first of the year we will start getting colder again. It also look like we will be dry for the most part. I’m sure if anyone sees anything interesting they will post something to let everyone know. 🙂

  6. Nahtalkin says:

    Reading the blog posting, I realize it’s all about the roads and the all important “ride-mobile”, second only to electronic devices. A cell phone clutching society obsessed with wheel spinning. Frankly a pathetic, shallow civilization we have become.

    • W7ENK says:

      Are you Amish? First it’s “electronic devices”, now it’s roads and “ride-mobiles.” Go plow your field by hand and stop whining about the rest of society and their devil toys, FFS.

      BTW, WTF are you doing using the internet? I thought
      “twidget mow-sheens” were off limits to you folks…

      STFU and GTFO, Teddy.

      • GTS1Kft says:

        Please don’t insult the Amish to chide Ted, W7. The vast majority of Amish are not as pathetically hypocritical as the bundle of neuroses/psychoses that constitute Robert Theodore Berry.

        Further, I believe alcohol may be involved (at 7:23 am!?).

        I’d wager he drives a “ride-mobile”, has a cell phone (among other “electronic devices”), and has availed himself of the intertubes as an outlet with which to share his ‘wisdom’.

        No doubt he’s insane by Einstein’s standard – but, like Elizabeth Warren, he persists. Mayhaps Mr. Nelsen will 86 him soon.

        There’s little point in engaging him other than sport – I find it mildly amusing. However, I sense a progression in his madness lately and think intervention/institutionalization would be best – lest the demons get the better of him.

        Peace – through strength….

        • W7ENK says:

          All valid points, Mr. Johnson.

        • pappoose in scappoose says:

          I’ve resisted the temptation to partake in the sport of which you speak GTS, in order to avoid clogging up the blog. The 86 is inevitable, hopefully sooner rather than later.

        • GTS1Kft says:

          Some of us just have less self-control, ‘poose. I get what you’re saying though.

          and….

          hehehe, I see what you did there, W7 😉

    • Jack says:

      Complains about “electronic devices” — while using his electronic device to transmit electrons to the rest of the planet, all of whom must use an electronic device to read said electronic transmission.

  7. isabella Miller says:

    I’m flying in new years eve so I hope the weather will cooperate. Sad to leave the Florida sunshine and warm temps

  8. Jason Hougak says:

    It wa a great reminder of last winter working today.

  9. Alohabb says:

    Counting down to Oahu.

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