Codes 00-09 General Group: No precipitation, fog, duststorm, sandstorm, drifting or blowing snow at the station at the time of observation or, except for 09 during the preceeding hour. Code: 07 Dust or sand raised by the wind at or near the station at the time of the observation, but no well-developed dust whirl(s), and no sandstorm seen: or, in the case of ships, blowing spray at the station
self-made, description according to US National Weather Service - Southern Region Headquarters
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