Day 1 Severe Weather Outlook

Valid 270100Z – 271200Z


Isolated thunderstorms are possible across southern parts of
California today and overnight across southwest Arizona and the
Texas South Plains.

Isolated thunderstorms remain possible through tonight over much of
southern AZ, supported by cooling aloft and favorable large-scale
ascent as an upper low approaches from the west. Southerly winds
ahead of the low will also favor upslope along the Rim. Severe
storms are unlikely, although very small hail may occur.

Elsewhere, modest low-level moisture return out of the east will
persist into western TX, as southerly winds just off the surface aid
lift via warm advection below 700 mb. Forecast soundings indicate
weak elevated instability may become uncapped into Friday morning
from MAF to CDS, with isolated, very weak convection possible,
producing isolated flashes.

..Jewell.. 12/27/2019


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