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Potential light snow 1/29 overnight to 1/30 thread


North Balti Zen

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Sterling AFD:

.SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY NIGHT/...
The upper-level trough will remain overhead through Monday before
ridging finally builds in Monday night. Most of Sunday should turn
out dry and seasonably chilly since the area will be in between
shortwaves. Max temps will range from the 20s in the mountains to
the middle 40s near Washington and Baltimore.

A potent shortwave will rotate around the trough...passing through
the area Sunday night. The upper-level trough overhead will
shift from a positive tilt to a shifts from a positive tilt toward
a neutral tilt in response to this energy...and you can see
reflection of this system down to the surface in the form of an
inverted trough and weak surface low. Guidance has begun to
converge on a solution that brings a period of light snow Sunday
night...but perhaps it will be a bit earlier than previously
expected. Tweaked the forecast to have the most likely period of
snow to be later Sunday evening into the overnight hours.
Subsidence behind the shortwave likely will cause precipitation to
diminish in coverage toward the morning rush on Monday.
However...slippery roads are possible through the morning rush
since temperatures will be below freezing.

The upper-level trough will begin to shift east Monday and a
northwest flow behind the departing area of low pressure will
bring colder conditions. Scattered snow showers are possible due
to instability and shortwave energy associated with the upper-
level trough. Although coverage appears that it will be
scattered...some areas may get another coating of snow during this
time. Max temps will be in the mid to upper 30s across most
locations...so pavement temperatures should rise above freezing
late Monday morning.

High pressure will build overhead Monday night. Dry and seasonably
cold conditions are expected.
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The  06Z 12K NAM favors 2 stripes of heavier precip. One north of the cities and one just south of the cities. Has also become more aggressive with it's snow fall maps with 2+ within these strips until they converge on the northern eastern shore, DE and New Jersey where it spits out 6-9 inch totals. 

The higher resolution models, 4K Nam, 10 K RGEM and the 2.5 HRDPS all show a single strip just south of DC running towards southern Jersey with 2+ totals. The higher resolution models are probably more realistic in the snowfall totals and it remains to be seen if they are correct with the single strip of max precip or the lower resolution Nam with its idea of 2 strips.

Just thought I would throw this in. First look at the snowfall map with the HRDPS and this is what greeted me. Threw me for a loop for a second. Needless to say it is not correct. :)

 

hrdps_snow_neng_34_75.png

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A showmethesnow noted, literally all of the mesoscale models and the globals show a stripe of snow in the mid-atlantic. All of the models show the snow falling between 00z tonight and 12z tomorrow. Most max out around 3 inches but a few (NAM) are generous with 4+. The 00z/06z runs broadly concentrate the axis of heavier accumulation on a N/E angle, stretching from Fredericksburg-ish to South Jersey - coastal plain jackpot somewhere

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5 hours ago, WxWatcher007 said:

Best case weenie scenario :lol: 

6A878DDD-A709-4783-97CD-F4FAC4A26D7D-1459-0000019751C8B16D_tmp.png

Look at that.  Jebman for the win.  He'll be walking naked through the streets. But my expert analysis says that 6 inch total will be just NW of there in the Nkesville, Bristow, Gainesville area.  It's pure science.  And wishcasting

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7 minutes ago, CoastalWx said:

Definitely potential for a surprise WTF band near DC. Very cold aloft with some instability combined with decent frontogenesis.  Strong s/w helping with forcing...could very well be in DC proper, but diagnosing the exact location of the band will be difficult.

Our buddy. :thumbsup:

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9 minutes ago, CoastalWx said:

Definitely potential for a surprise WTF band near DC. Very cold aloft with some instability combined with decent frontogenesis.  Strong s/w helping with forcing...could very well be in DC proper, but diagnosing the exact location of the band will be difficult.

Bazinga!  :snowing: It will be hard to sleep tonight. If you like looking at the tail end of the HRRRRRRRR, it suggests that snow won't really get here to after 12AM, along with most of the other models. Who needs to get to work on time tomorrow anyway??

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