Limited Aviation Weather Reporting System (LAWRS) Practice Exam 2025 – All-in-One Guide to Mastering Your Certification!

The encoding for Altocumulus Castellanus located from the south through southwest is correctly represented as "ACC S-SW." This format specifies the type of cloud (Altocumulus Castellanus denoted by "ACC"), followed by the direction from which the cloud is observed.

In this case, "S-SW" indicates a range from south to southwest, which accurately describes the cloud's location relative to the observer. The dash (-) serves as a clear delineation, indicating that the orientation spans between the southern and southwestern points on the compass.

The other options fail to represent this direction accurately. For instance, "SW-S" could suggest a reverse or unclear range, whereas "S-W" does not capture the intended southeasterly direction correctly, and "SSW" reflects a more specific direction rather than the broader range intended by the question. Thus, the encoding "ACC S-SW" provides the clearest and most precise representation of the cloud's location in terms of aviation weather reporting.