SIGWX


SIGWX is a Significant Weather Chart defined by ICAO.
Weather charts being issued by World Area Forecast Centres , presenting the most important meteorological phenomena relevant especially for air traffic transport. WAFC publishes them in two formats
Charts are typically being issued every six hours. The SIGWX charts only show the forecast for the specific hour, however it is common place for parameters such as the JetStream, CAT & CB to be interpreted +/- 3 hours of the chart validity time. . Prognoses are typically prepared for two ranges of heights:
Weather phenomena:
IMPORTANT NOTE: Amendment 74 to ICAO Annex 3 eliminated the requirement for depiction of surface fronts and well-defined convergence zones on WAFS SIGWX forecasts. WAFC still publishes frontal bulletins, but they contain no data.