Figure 2-5. Low Level Significant Weather Prognostic Chart

CHAPTER TWO

METEOROLOGY FLIGHT PLANNING

Figure 2-5 Low Level Significant Weather Prognostic Chart

The left two panels are a 12-hour forecast, while the right two are a 24-hour forecast. The

bottom two panels are a surface prognosis, as indicated in the chart label in the lower part of each

panel. These indicate the conditions forecast to occur on the surface, and can be thought of as

the "cause" for the top two panels, the "effect." The top two panels show the significant weather

that is a result of the forecast surface conditions, including areas of VFR, MVFR, and IFR, the

locations of the freezing level, and areas of moderate or greater turbulence. Additionally, note

the legend applies only to the top two panels, as those lines are not used in the bottom two. Each

particular line will be labeled with its corresponding altitude, either "SFC" for the surface, or a

two or three digit number representing the altitude in hundreds of feet MSL.

2-6 DATA DISPLAYED ON WEATHER IMAGERY PRODUCTS