Nimbostratus praecipitatio pannus, this photo was taken viewing south, and the nimbostratus cloud appeared after the passage of a cold front, with a north wind, which is typical in Northern Mexico after cold fronts, also known as Norte wind, the air was moist and cold which also indicated the presence of Norte wind
<a href="//commons.wikimedia.org/wiki/User:Rollcloud" title="User:Rollcloud">Rollcloud</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>