Effective 06 April 2015, Japan Meteorological Agency uses symbol like $/ℓ for present weather code ww=07 (blowing dust or blowing sand for land stations, or blowing spary for ship) on its Asia-Pacific surface analysis charts stamped ASAS http://www.jma.go.jp/en/g3/. Before that the symbol $ was used regardless the report is for land or for ship.
The ww symbols table have a story I wrote before:
http://toyoda-eizi.blogspot.jp/2014/11/changes-of-present-weather-symbols-for.html
http://toyoda-eizi.blogspot.jp/2014/11/changes-of-present-weather-symbols-for.html
On 1970 the Fifth session of the Commission for Synoptic Meteorology (FR ¶6.4.2.2) changed the symbol from $ to $/ℓ with a footnote:
When ww is coded 07, the symbol for blowing dust or blowing sand （$） is used if the observation originates from a land station, the symbol for blowing spay （ℓ） is used if the observation originates from a sea station.
When ww is coded 07, the symbol for blowing dust or blowing sand （$） is used if the observation originates from a land station, the symbol for blowing spay （ℓ） is used if the observation originates from a sea station.
On 1980 the Extraordinary session of the Commission for Basic Systems replaced the table with current one (as attached) in its Recommendation 7. The footnode above was removed at that time.
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