FWD thinks it more likely than not is exclusively a south of I-20 event:
But don`t buy those snowman kits just yet. The main uncertainty
is the track of the upper level low which will dictate the areas
that get snow and the ones that either are cloudy or rainy. As of
now there`s 2 general scenarios, both highlighted in the ensemble
data: a weaker upper low and a more northern track, and a stronger
low with a more southern track. The southern track seems to be the
more likely solution based on cluster analysis of the ensemble
members and the primary deterministic runs of the global models.
This track means that snow potential tapers off dramatically north
of I-20 with Central Texas seeing the higher totals. The weaker
northern solutions means more rain than snow across Central
Texas, with the higher snow totals along the I-20 corridor. But
it`s also worth nothing that a deeper and more southerly track
may also allow the upper low to swing northeast through East Texas
and bring snow northward Sunday evening. All said, it`s too early
to pick a forecast track solution and we will stick close to the
NBM blend. This will advertise the highest PoPs in the Central
Texas Sunday, tapering down to slight chance north of I-20. For
precipitation type, since the surface layer may need to be cooled
by precipitation, it may start out as rain early Sunday but should
transition to snow. Given the cold temps aloft, any areas that do
see sufficient precipitation should cool to near freezing and
accumulations would occur. We do not expect temps to get much
below freezing which will help keep roads more slushy than icy at
least through Sunday night. It`s too early to talk about
accumulation totals, but needless to say accumulations somewhere
in our CWA look like a good bet. Again, the worded forecast will
stay generic with precipitation type being advertised as a rain
and snow mix.
It's like someone built a snow shield over DFW or something