Blowing sand

From Glossary of Meteorology

blowing sand

Sand particles picked up from the surface of the earth by the wind, reducing the horizontal visibility to less than 11 km (about 7 statute miles).

This lithometeor is encoded BN as an obstruction to vision in a surface aviation weather observation and as BLSA as an obstruction to vision in a METAR or SPECI observation. In its extreme form, blowing sand constitutes a sandstorm.

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