| (: XQuery Filter Query :) | |
| (: Find all reading for hurricane force wind warning or extreme wind warning. :) | |
| (: The warnings occur when the wind speed (AWND) exceeds 110 mph (49.1744 :) | |
| (: meters per second). (Wind value is in tenth of a meter per second) :) | |
| let $collection := "ghcnd_quarter_1|ghcnd_quarter_2|ghcnd_quarter_3|ghcnd_quarter_4" | |
| for $r in collection($collection)/dataCollection/data | |
| where $r/dataType eq "AWND" and xs:decimal(fn:data($r/value)) gt 491.744 | |
| return $r |