A strong upper level low pressure system over northern Mexico is expected to move northeast into the Big Bend region on Tuesday and then northeast into north central Texas by early Wednesday morning.

A winter weather advisory has been issued for Fisher, Nolan, Coke, and Sterling counties where mixed precipitation of rain, sleet, or snow may result in accumulations of up to an inch.

Elsewhere, temperatures are expected to become cold enough for the rain to change over to snow or sleet for areas west of a line from Abilene to Sonora. However, accumulations are expected to be very light. A rain and snow mix is expected to develop over the remainder of west central Texas Tuesday night.

The precipitation may become all snow late Tuesday night into Wednesday morning and continue through mid day mainly north of a San Angelo to Brownwood line as the upper system moves east of the area.

Chance of precipitation is 80% today and 70% tonite.