Low level prognostic charts consist of what altitudes?

Low level prognostic charts consist of what altitudes?

• A. MSL to FL240.
• B. SFC to FL100.
• C. SFC to FL600.
• D. SFC to FL240.

Answer: (D)

Low-level prognostic charts are designed to forecast weather in the lower part of the atmosphere. They cover the airspace from the surface up to a ceiling of flight level 240 (about 24,000 feet). This boundary keeps the charts focused on the altitudes most used for lower-level planning and operations. Above that level, forecast products are categorized as high-level charts. Therefore, the proper range is from the surface up to FL240. Using surface to a lower top (like FL100), or extending up to FL600, or using a surface reference with MSL instead of SFC, would not match how these charts are defined.

Low-level prognostic charts are designed to forecast weather in the lower part of the atmosphere. They cover the airspace from the surface up to a ceiling of flight level 240 (about 24,000 feet). This boundary keeps the charts focused on the altitudes most used for lower-level planning and operations. Above that level, forecast products are categorized as high-level charts.

Therefore, the proper range is from the surface up to FL240. Using surface to a lower top (like FL100), or extending up to FL600, or using a surface reference with MSL instead of SFC, would not match how these charts are defined.