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Low Level SIGWX Charts Help
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The low-level graphics product is a forecast of aviation weather hazards,
primarily intended to be used as a guidance product for briefing the VFR pilot. The
forecast domain covers the 48 contiguous states, southern Canada and the coastal waters
for altitudes below 24,000 ft.
Low altitude Significant Weather charts are issued four times daily and are
valid at fixed times: 0000, 0600, 1200, and 1800 UTC. Each 4 panel chart is
divided on the left and right into 12 and 24 hour forecast intervals (based on
the current ETA model available). The upper two panels (SIG WX PROGs) depict freezing
levels, turbulence, and low cloud ceilings and/or restrictions to visibility (shown as
contoured areas of MVFR and IFR conditions). The lower two panels (SFC PROGs) are
provided by the Hydrometeorological Prediction
Center (HPC) and consist of graphical displays of fronts and precipitation areas.
This legend appears on the 4 panel chart and applies to the upper (SIG WX PROG) charts. It has been removed from the individual color charts. |
This legend appears on the 4 panel chart and applies to the lower (SFC PROG) charts. It has been removed from the individual color charts. |
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