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2/13 Light/Moderate Snowfall Nowcasting & Observations


Northof78
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It will snow everywhere (80% chance in my opinion), maybe preceded by a little rain at 2AM Sunday on I95? Probably melt after 9AM on all road surfaces. NWS Blend of models 1/2-2" for our subforum as of 5A today. Sharpening trough..still bears monitoring for periods of snow into early Monday LI-NJ coast. RGEM/NAM/HRRR operational models to monitor for trends down or up.  Chance of snowfall above 2" is only 40% at most as of the 4AM NWS ensembles. Still a worthy monitor for winters goodness.

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Sunday morning the southern stream energy will begin to eject
east and then northeast ahead of the approaching mid-level low
pressure. Simultaneously, the upper level low will be
approaching from the west with guidance being fairly consistent
on FGEN forcing developing Sunday morning. The sloped ascent
appears to setup from southeast NJ to eastern PA. The latest run
of the GFS and ECWMF have most of the QPF across central NJ
Sunday morning while the CMC has the QPF over eastern PA. The
other item of related interest here is the development of
surface low pressure off the NC coast Sunday morning. The CMC
keeps the mid-level low closed off longer and less progressive,
allowing for a slightly deeper and further west surface low.

Guidance is also showing another wave diving southeast out of
south/ central Canada Sunday afternoon. This would favor a
slightly more progressive pattern. Taking a look at the latest
GEFS/ EPS/ and GEPS, a slightly more progressive pattern appears
favored at this time. The precipitation- type for this event
will likely be all snow as thermal profiles rapidly cool Sunday
morning.

lowtrack_ensembles.gif.d07b3c815e5fca3c496ef17f599e6251.gif

A_48hrsfc.thumb.gif.5a74f7536c0f22b80d5bfcd4ae73fd73.gif

I will channel Roger Staubach today.....well just because anyone gives a dang  B)

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...Mid-Atlantic/Northeast... Day 3... Digging 500 mb shortwave trough over the Mid-South Saturday evening will move through the Southeast by early Sunday near the entrance regions of the northern (130kt) and southern (110kt) jet. Frontal boundary along the coast may focus an area of low pressure that tracks along or just offshore that would spread precipitation back across portions of the region. There continues to be many uncertainties ranging from track, phasing, and intensity as well as thermal profiles as the precipitation changes from rain to snow. For now, the greatest probabilities for 2 inches lies over the central Appalachians/Blue Ridge in VA (20-40 percent) while lower probabilities of 10-20% exist through the Mid-Atlantic to southern New England.

 

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8 minutes ago, MJO812 said:

It's over

Agreed. It’s a sheared out, disjointed mess of nothing that never gets its act together, fast flow and the lifting just falls apart. All 12z models show this. The metro area will be lucky to see an inch, most will get a dusting/coating on the grass and car tops

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3 minutes ago, mikem81 said:

NAM may be on drugs but it looks like a light event and close to something more if the coastal had slightly more time to move north before being kicked east...

It’s on drugs. It’s the NAM being the NAM, it usually does this at either 6z or 18z, no other model is showing anything even close to that 

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