A Sandstorm!?
From Arkham Horror Wiki
A Sandstorm!? is a mythos card. It first appeared in the Curse of the Dark Pharaoh expansion.
Card Information
Mythos Type: Environment (Weather)
Gate Opens: Independence Square
Clue Appears At: *Woods
  
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Mythos Ability: Investigators must spend 2 additional movement points to enter any location marked with a green diamond. While this card is in play, instead of having an Arkham Encounter, any investigator in a street area may pass a Luck (-1) check to draw 1 Exhibit Item.
Flavor Text: Against all reason, a sandstorm comes up out of nowhere and strikes Arkham, clogging the streets and burying whole buildings! Strangely, it seems to avoid certain places with dark reputations.
