Twitter users in the capital of Saudi Arabia were highly active during the storm, giving a flavor of the experience.
Some posted TwitPics of the event.
@adriang (Riyadh, Saudi Arabia): http://twitpic.com/1z3pr - There is a massive sandstorm in Riyadh
@khaled (Riyadh, Saudi Arabia): Ok.. This sandstorm over Riyadh just reached here... #Saudi #weather http://twitpic.com/1z3iz
Others relayed personal accounts and various reports.
@chikom (Riyadh, Saudi Arabia): back in office, sandstorm was hell on car & nerves
@chikom (Riyadh, Saudi Arabia): daughter : my teacher said the sandstorm will last 3 days !
@mutairy (Riyadh, Saudi Arabia): HOLLY [expletive]! .. more than 73 accidents so far in #Riyadh !! the police started waving people off major roads! because of all the dust!
@mutairy (Riyadh, Saudi Arabia): hospitals in riyadh are overloaded after the dust mega storm, i told my family to duct tape the windows
@molozonide (Riyadh, Saudi Arabia): sky turning orange / dust and dust and dust and dust / sandstorm in riyadh
@wilbur101 (Riyadh, Saudi Arabia): in the middle of the biggest sandstorm in riyadh i've ever seen. the saudis are agreeing. this is how a bad day on Mars would look like.
After posting a picture himself, @khaled linked to a news organization that compiled a round-up of photos from the event.
@khaled (Riyadh, Saudi Arabia): After today's sandstom, http://bit.ly/P8PDW , rain comes :)