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Weatherman

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Weatherman last won the day on January 17

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About Weatherman

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  • Birthday 02/04/1983

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  1. Right? Imagine calling someone for a ride at 1:30am.
  2. As we arrived at Crotched last night for the adult race league, we noticed an excavator working a big hole in the parking lot. It turns out that they had a pipe break underneath the parking lot at 1:30am Saturday. I'm told that it took out 3 cars in the process. No word on who the lucky people are who got new cars courtesy of Peak Resorts.
  3. Weatherman

    Introducing "Chasing Snow"

    Big announcement. Sort of. Instead of posting to the hard to find blog, I am going to be making future posts as a dedicated thread in the forum. You can filter for them using the "chasing snow" tag.
  4. Weatherman

    MLK weekend snow?

    I'd like to think the cold will keep people at home, but last Saturday's lines at Sugarbush dissuaded me of this idea.
  5. Weatherman

    2019 car thread

    No. But new snow tires are. You need to use tires with the same outer radius.
  6. Weatherman

    Roll Call 1/19-21

    Oh, exciting! Glad to see you back at it!
  7. Weatherman

    MLK weekend snow?

    I had just checked the Magic snow report which shows most of their expert-only terrain as closed.
  8. Weatherman

    MLK weekend snow?

    Then I hesitate to suggest southern Vermont. There isn't much base there to underly the fresh snow.
  9. Weatherman

    2019 car thread

    Any snow tire is a good idea over an all-season.
  10. Weatherman

    MLK weekend snow?

    Maybe? I'm not ready to give any specific mountain recommendations yet. The consistency of the snow will be the biggest question. And existing base depths giving you a surface to work with.
  11. Weatherman

    2019 car thread

    Dry grip. Cornering and such.
  12. Weatherman

    MLK weekend snow?

  13. Weatherman

    MLK Weekend 2019

    This MLK weekend promises to be a great one for the New England skier. We're facing a sizable snowstorm Saturday night through Sunday. Look for widespread accumulations of a foot or more across ski country. Amounts will be highest in the White Mountains and southern Vermont, with less amounts as you move north into Vermont. Cutting to the chase, here are the latest snowfall forecasts from the National Weather Service. I think those amounts look like a decent guess for New Hampshire and Maine, but are overdone in Vermont. Yesterday's guidance was putting on crazy numbers over New England. For that reason I held off issuing a forecast until today when a more realistic picture has emerged. The most stable story so far as come from the European's model ensemble average. As ensemble is the same model run over and over with slightly different conditions and averaging the results, which gives a broad expected value. For a while now the European ensemble has been showing an average snowfall of about 15". As much as I'd like to drone on about the snow, I think that misses the main story of this storm. There will be plenty of cold air pouring into New England which should ensure snow in ski country, but it creates a strong frontal boundary across southern New England and coastal regions. The headline maker in this storm very well may be significant ice accumulation along the coastal front. The both the GFS and European model show this clearly. Below is a model forecast for Sunday afternoon from the GFS, and a total accumulated freezing rain from the ECMWF. Both models show a band of heavy icing across southern New England. This would lead to widespread power outages. However, I think the story may not be quite so dire. Especially considering it is a few days in advance, I think the models are underestimating the cold air at the surface. Surface temperatures just west of Boston look to stay in the teens throughout Sunday. Not only will the preceding air be cold, there are strong signs of this cold air reinforcement in the model vertical profile. Note the winds out of the north and northeast at the lowest altitudes. This should be cold enough and deep enough to yield sleet rather than freezing rain, but we'll need to revisit this as the day approaches. But if you're reading this, you probably care more about skiable snow totals. The easiest statement I can make is that I expect a little over an inch of liquid equivalent precipitation across much of the region. The storm is so progressive (quick moving, positively tilted, nearly open low) that it's hard to imagine much more than this inland of the coastal front. How this translates into snowfall depends strongly on the snow-to-liquid ration (i.e., the fluff factor). A rule of thumb of 10:1 ratio suggests a broadly distributed accumulation of 12-15" consistent with the weather service's forecast for NH and ME. You can see this in the latest mesoscale guidance if you ignore the numbers over southern New England where sleet will likely keep numbers way down. But what about if the snow is fluffier? This possibility is supported by the surface temperatures in the teens. That's plenty cold enough for ratios up to 20:1, assuming that those temperatures are maintained in the snow growth zones aloft. Using the same liquid equivalent precipitation and allowing for the ratios to vary with the surface temperature you forecast accumulations close to two feet in northern New England, and greatly reduced accumulations in southern New England. The fluff factor is going to be the decider in the snowfall guessing game. So what's the realistic expectation? Probably a mix of these two possibilities. The GFS gives a reasonable first guess. Note the starkly difficult accumulations over the Lakes Region of NH vs the White Mountains. What's driving this difference? It's the temperature profile aloft and where that places the dendritic growth zone (DGZ). That's the region of roughly -10 to -20 Celsius. To maximize snowfall, you want a deep region of these temperatures that also has saturated air rising upward. That maximizes the product of dendrites, which are the classic fluffy snowflakes that you are probably imagining. The temperature and humidity profile in the atmosphere can lead to a variety of snowflake shapes. Looking back at that snowfall forecast disparity between the NH lakes and mountains, let's look at the model's vertical profile forecast. First the Lake Region: Note the narrow dendritic grown zone (DGZ) show on the left column with the red dashed lines. The red-purple bars are the air's vertical motion expressed in pressure-based coordinates (omega) where negative omega values mean the pressure following an upward-moving air parcel is decreasing. Even though this region has saturated air and strongly upward lift, the DGZ is narrow and most the prime snow generating region will produce other shapes of snowflakes leading to a lower fluff factor. A similar plot just to the north over the White Mountains will show a slightly colder profile, but a greatly expanded DGZ and therefor higher fluff factor.
  14. Weatherman

    MLK weekend snow?

    That's the big questions for the mountains. The temperature argue for high ratio blower. But thus far the dynamics argue against it. Will be interesting to see what the higher res guidance shows tomorrow.
  15. Weatherman

    MLK weekend snow?

    There's a lot going on in those images. I'm seeing a more coherent picture now. I'll write up something this afternoon. Gathering some images now. Maybe I'll steal those from @Flying Yeti

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