Area Forecast Discussion
National Weather Service Fort Worth TX
408 AM CST Sat Jan 11 2020
.SHORT TERM...
/Today and Tonight/
Water vapor imagery shows the deep trough axis spreading into
North Texas this morning with all of the stronger convection now
well east of our area. Strong dynamic forcing for ascent will
continue for around another 4-6 hours across North Texas before
subsidence on the back side of the trough takes over. Given the
sufficient supply of moisture still in place, strong lift, and
very cold temperatures associated with the core of the trough, it
appears more likely that we`ll see at least some wintry
precipitation through the early morning hours across parts of
North Texas. Regional radar imagery shows a band of light to
moderate precipitation extending from near Abilene north toward
Wichita Falls. This is expected to increase in coverage and
continue eastward through the mid/late morning hours. As it does,
strong low/mid level cold advection will continue to cool the
thermal profile across the region. Right now, the precipitation is
all rain, but surface temperatures are at or below freezing just
north of Abilene and should drop to below freezing across our
northwest counties by sunrise. Light freezing rain should
initially occur with perhaps some very light ice accumulation on
elevated roads to the northwest of the Metroplex. Further cooling
of the thermal profile between 900-800 mb should support a
transition to snow in some areas between 6-9 am.
One complicating factor to all of this is that as the trough axis
approaches, lapse rates will steepen through the mid morning hours
to in excess of 7.5 C/km between 700-500 mb. This would yield
about 50-100 J/kg of elevated instability within the dendritic
growth zone and would support the possibility of a few rumbles of
thunder along with brief bursts of heavier snow. Unfortunately,
where exactly this occurs down to the county level is challenging,
but the combination of best moisture, coldest temperatures, and
strongest lift appear to line up from Jacksboro to Denton and
north of there. We`ll have a short duration Winter Weather
Advisory in effect through noon for these areas and continue to
monitor. Heaviest snowfall amounts should generally be between
1-2" at most and should generally be confined to grassy surfaces.
All wintry precipitation should end by late morning as the trough
pulls off to the east.