Geelong Roll Cloud
August 16, 2012
Photographer: Phil Thomson; Phil's Web site
Summary Author: Phil Thomson; Jim Foster
This captivating photo shows an Oz-like roll cloud approaching a yellow pebble road near the town of Geelong in Victoria, Australia. The late afternoon storm proved to be quite destructive as it tore through the Barrabool Hills area. Roll clouds are detached from the base of their parent cumulonimbus cloud. The winds accompanying such storms are straight-line as opposed to the tornadic winds associated with funnel clouds. While they're not always as fierce as they appear, this storm was as ugly as it looked. Photo taken on June 4, 2012.
Photo details: Camera Maker: PENTAX; Camera Model: PENTAX K-5; Lens: Pentax 18-55 lens - 18mm; CPL and GND Filters; Focal Length: 18mm (35mm equivalent: 27mm); Aperture: f/8.0; Exposure Time: 0.167 s (1/6); ISO equiv: 400; Exposure Bias: none; Metering Mode: Spot; Exposure: Manual; Exposure Mode: Manual; White Balance: Manual; Flash Fired: No (enforced); Orientation: Normal; Software: raw image edited in ACDSee Pro5.