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About heavy_wx

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  • Four Letter Airport Code For Weather Obs (Such as KDCA)
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  • Location:
    North Laurel, MD

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  1. Starting to get a wet coating of snow on the grass here with steady, light snow.
  2. Light snow with small flakes here in North Laurel.
  3. Still looking wintry out this morning. I did notice a bit of ice accumulation on the tree branches here in North Laurel.
  4. Precip looks to be winding down for now here; only some light sleet falling at the moment. Measured about 5" on the ground after roughly 6 hours of mostly snow.
  5. Getting some very large aggregates now in North Laurel.
  6. Measured about 4.5" on the ground here in North Laurel. Currently partially frozen melted aggregates and needles falling.
  7. 3.5" on the ground in North Laurel. Moderate snow with irregular-shaped ice particles.
  8. Measured about 1.5" on the ground in North Laurel. Saw a good mix of thin columns/needles, rimed dendrites, and small/moderate-sized aggregates.
  9. Yeah, bigger and fluffier aggregates starting to mix in here.
  10. There are some reduced RhoHV values north and east of Albemarle County indicating sleet mixing. Still > 100 km from the LWX radar. Also, enhanced ZDR values outside of the heaviest bands indicate good ice crystal growth. Decreases in ZDR and large increases in reflectivity (ZH) in the heavier bands indicate an efficient aggregation process as the aggregates lose their horizontal alignment/extreme aspect ratios.
  11. Small aggregates here, but the visibility has dropped noticeably with the enhanced reflectivity over southern Howard County. Probably some pristine ice crystals mixed in as well based on the areas of larger ZDR on radar.
  12. Yes, the depth of the warm layer increases rather quickly (see the cross-section animation below). The surface is usually the slowest to warm in these types of events with strong HP/ageostrophic low-level flow of cold air. Guidance from the 06z 3-km NAM shows forcing along the frontal surface decreasing in height with time; the greatest frontogenesis over our area is around 600 mb at ~12z, and the frontogenesis weakens and decreases in height with time (tracing the frontal surface). The dry air present at the low levels ahead of the precipitation makes me question if the more intense (>1-2"/hr) snowfall rates will occur beyond a brief period, especially as the forcing weakens after 12z. By the way, the cross-section feature from Tropical Tidbits is fantastic!
  13. It's certainly possible, especially if we get a lot of graupel forming. Getting some flurries here now.