The synoptic chart (from the Greek synopsis, meaning overview) is the fundamental tool of classical meteorology. It represents on a geographical map the simultaneous values of atmospheric pressure, temperature, wind, humidity, and precipitation measured at surface weather stations at a specific time (typically 00, 06, 12, and 18 UTC). Isobars—lines of equal pressure—allow identification of anticyclones, depressions, and fronts (cold, warm, occluded). Reading a synoptic chart follows well-established rules: closely spaced isobars indicate a strong pressure gradient and intense winds; widely spaced isobars indicate calm conditions. Fronts are represented with standardised WMO symbols—blue triangles (cold front), red semicircles (warm front), alternating (occluded). The position and trajectory of these systems allows prediction of weather evolution over the following hours and days. In the digital era, synoptic charts remain indispensable although complemented by numerical models. AEMET, Met Office, Météo-France, and other national services publish synoptic analyses every 6 hours. The ability to read a synoptic chart is essential for pilots, sailors, mountaineers, and meteorologists, as it provides an intuitive understanding of the atmospheric situation that isolated numerical data cannot offer.