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Newman

Meteorologist
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Posts posted by Newman

  1. Berks and Lehigh counties look to be in the best spot for this as of now. Probably start as some brief rain, unlike those in Carbon/Monroe counties. But the strongest banding and snowfall rates will slide through south of the Poconos for the longest duration. 6-10" thump in that area

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  2. Latest 12z GFS with yet another shift south. Sounding provided is for SE PA valid at 12z tomorrow morning. Fully saturated through the DGZ with maximum omega as well. It's going to thump around the morning commute, easily 1-2"+ rates for a time. Even though it's a quick moving storm, some places will see over 6" with rates that heavy for a time

    gfs_2024021212_024_40.25--75_75.thumb.png.116aadcf3123817cb4eb1b76bca4de8f.png

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  3. NWS upgraded the NW burbs WWA to 3-5" on the latest forecast package. If the NAM is to be believed, there could be an iso 6"+ in there across Berks or the Lehigh Valley. Depends if we get some good banding to set up across that area, otherwise i don't think rates or snow growth will be spectacular. Snow comes in around 7-9pm, gone by 10-11am on the NAM. That's a solid 14-16 hours of snow. But, we won't be seeing consistent 1" hour rates or something. 

     

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  4. The RGEM comes in cooler as well, following the NAMs. Again, there was a very slight shift south with the 850mb low, but each mile matters as the rain-snow line battle will be a real one. Below is a sounding from the RGEM for tomorrow evening in eastern Berks county 0z UTC. Between 21z and 3z (so like 4pm-10pm) is when much of the NW burbs will see their best snow growth. After that, rates will drop off. Certainly not extremely "unstable", but the mid-levels do have pretty steep lapse rates and that will aid in dynamics. Between 4pm-7pm the RGEM has a solid 700mb fronto band push through. This is that initial "thump" that many will be relying on.

    rdps_2024010518_033_40.49--75.7.thumb.png.465368869234c780755375408be128ca.png

    700fgen.us_ma.thumb.png.1525c9bc39e0d4326b6c4c4884125d82.png

     

  5.  

    The 850s are held more at bay on the NAM, aided by the mid-level circulation passage coming in a bit further south this go around.

    namconus_z850_vort_us_fh30_trend.thumb.gif.2c72258914601605068953ce8e2c48a6.gif

    Just now, MGorse said:

    It was 3-5 inches earlier, so not a significant change. 

    Yes just pointing it out.

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