... Wintry mix possible Sunday morning...
As a weakening upper level low ejects northeast into the region
tonight and Sunday... light rain will begin developing late tonight
over the southern Edwards Plateau and Rio Grande plains as Gulf
moisture overruns a modified polar airmass in place. As readings
continue dropping towards sunrise... some of the rain will become
mixed with sleet. After sunrise... the overrunning precipitation
will spread eastward as the disturbance moves across the region.
Atmospheric forecast soundings show relatively dry air at the
surface across The Hill Country and over northern portions of
south central Texas at the time of subfreezing temperatures Sunday
morning. Thus... much of the Gulf moisture that overruns Sunday
morning is expected to evaporate before reaching the ground... and
accumulations of ice or snow are not expected at this time. As
overrunning continues during the day... precipitation will become
all rain by afternoon as temperatures rise above freezing.
Model timing and precipitation amount uncertainties remain. Residents
should stay tuned to later forecasts and statements on this potential
wintry mix event Sunday morning.
