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Jan 15-16 Storm Thread 3: Obs and Disco


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16 minutes ago, wxmvpete said:

850mb warm air advection continues to increase with 850mb frontogenesis that will support a band of heavier snow N&W of DC in the coming hours. What becomes the wildcard is the approach of a 500mb jet streak over the OH Valley overnight. At the nose of the jet, divergent flow atop the atmosphere will support healthy vertical velocities 12Z Tuesday. This is driving the snowier solutions from northern MD into eastern PA. The new NAM seems to feature similar setup.

85mb Frontogenesis.JPG

RAP 500mb.JPG

500mb VVs.JPG

Oof...  bad ass.

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Latest LWX AFD

Quote

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
915 PM EST Mon Jan 15 2024
.SYNOPSIS...
Low pressure sliding to our south will bring widespread light to 
moderate snow to the region. The low pressure system will slide off 
the Delmarva coast Tuesday morning with arctic high pressure 
building in. Dry and cold conditions are expected midweek before 
another wave of low pressure and front approach Friday.
&&
.NEAR TERM /THROUGH TUESDAY/...
Frontogenetical band has been lifting northward into the area 
this evening ahead of a wave of low pressure. Moderate to 
briefly heavy rates are occurring within this band and will lead
to deteriorating travel conditions. So far, snow measurements 
and model data are largely on track with the official forecast.
The northwestern portion of the CWA has been underperforming as
drier air has held firm, but this band will still affect most 
of those areas before pivoting away. On the other hand, if the 
band becomes stationary or has a pivot point, some places could
reach warning criteria of around 5-6 inches. It still appears 
most probable this would occur across north central Maryland, 
but confidence is still not high enough to upgrade due to the
mesoscale nature of any such feature...with consensus being 
most areas receive an additional 2-4 inches before the snow 
winds down in the morning (except southern Maryland where rates 
have already decreased).
Some freezing rain may mix in on the tail end of the system 
across central VA and southern MD with warmer air trying to work
in as it departs Tuesday...although freezing drizzle could also
be an outcome due to some drying aloft. Some guidance has the
northwest extent of the ice into the Baltimore/Washington metro,
but even if it were to occur, amounts would be very light with
minimal additional impact. Winter Weather Advisories remain in 
effect for the aforementioned threats above. Mountain locations 
will see a touch more snow with accumulations ranging between 4 
to 8 inches along and west of the Allegheny Front. This is due 
to the added lift from the terrain plus upslope component that 
looks to keep snow going through early Tuesday afternoon, and 
Winter Storm Warnings remain in effect for this area.
Lows will not drop too far from current readings overnight in 
the mid to upper 20s areawide outside the mountains.
 
Low pressure will continue to lift north and east of the
Delmarva coast Tuesday morning. Some light snow may linger over
northern MD through mid-morning with upslope snow showers set 
to continue in northwest flow over the mountains through Tuesday
afternoon. Highs Tuesday will range between the teens over the 
mountains to mid to upper 30s south/east of I-95.
 

 

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13 minutes ago, wxmvpete said:

Really starting to see returns filling in at higher radar tilts in western VA. What originally featured drier returns around 4,800ft out near the I-66/I-81 merger (around 850mb) is showing brighter returns. For those who have patiently waited in Northern MD, those heavier rates will be realized soon.

KLWX - Super-Res Reflectivity 3, 8_52 PM.gif

Was noticing this as well. The evolution is going as expected from what has been depicted by most guidance. Should see some 5-7” totals out of this one at this rate. Combo of 85H frontogen coupled with the mid-level ascent pattern should yield periods of 0.75-1.5”/hr rates for a time overnight into the early morning hrs. 

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1 minute ago, MillvilleWx said:

Was noticing this as well. The evolution is going as expected from what has been depicted by most guidance. Should see some 5-7” totals out of this one at this rate. Combo of 85H frontogen coupled with the mid-level ascent pattern should yield periods of 0.75-1.5”/hr rates for a time overnight into the early morning hrs. 

Where do you feel like we end up? Just down the road from you. 

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15 minutes ago, Eskimo Joe said:

So happy for all the mets that post here, you, @MillvilleWx, @WxMan1, @WxUSAF, @Terpeast and so forth!

I ran out of reactions to give, but I appreciate the sentiment. Include @wxmvpetefrom now on. He’s an incredible Met and a great friend. Went to Millersville together for a time and work together at WPC. Amazing mind for winter weather and analysis. We’ve been looking forward to a day like this for a long time. It’s been a nice storm so far and will only continue to crank overnight. 

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2 minutes ago, EB89 said:

Where do you feel like we end up? Just down the road from you. 

3-6” is a solid bar right now. We are over 2” currently and the good stuff is really just starting. NAM has been steady 4.5-6” for several runs. Sounds right for what’s transpiring. You in North FDK? 

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6 minutes ago, Terpeast said:

Radar filling in nicely in this corridor

IMG_5909.thumb.jpeg.ecdeb0d04d31f63aa5ddaf265a101049.jpeg

 

9 minutes ago, Eskimo Joe said:

Latest SPC mesoanalysis is showing I-95 and points west with some great lift in the dendritic growth layer. Should see some legit moderate or even briefly heavy snow soon.

Can confirm. Heaviest SN+ of the entire storm here right now. Ratios are strong.

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