Reckoning / Weather / Weather symbols
Weather · WMO code 4677
Weather symbols
On a weather map each observing station reports “present weather” as a two-figure code, ww, from 00 to 99, drawn as a small sign. The signs combine a few elements: a dot for rain, a comma for drizzle, a star for snow, a triangle for showers.
Intensity is counted in elements: one, two, three or four dots for slight to heavy. Elements stacked vertically mean intermittent; spread side by side, continuous. An inverted triangle beneath a sign makes it a shower.
Common signs
Haze
Mist
Fog, sky invisible
Lightning visible, no thunder heard
Drizzle, intermittent, slight
Drizzle, continuous, slight
Drizzle, continuous, moderate
Rain, intermittent, slight
Rain, continuous, slight
Rain, intermittent, moderate
Rain, continuous, moderate
Rain, intermittent, heavy
Rain, continuous, heavy
Snow, continuous, slight
Snow, continuous, moderate
Snow, continuous, heavy
Rain shower, slight
Snow shower, slight
Hail shower, slight
Thunderstorm, slight or moderate, with rain or snow
Meanings: Manual on Codes, Volume I.1 (WMO-No. 306): code table 3700 (state of the sea) and 4677 (present weather), code table 4677. The signs are redrawn here after the international station-model symbols; this is a selection of 20 of the 100.