Encore - Morning Glory Over Southeastern Brazil

August 15, 2020

1-CANON 007-003

Today and every Saturday Earth Science Picture of the Day invites you to rediscover favorites from the past. Saturday posts feature an EPOD that was chosen by viewers like you in our monthly Viewers' Choice polls. Join us as we look back at these intriguing and captivating images.

Photographer: Meire Ruiz
Summary Authors: Meire Ruiz; Jim Foster
October 2014 Viewer's Choice
The photo above shows a weather phenomenon known as a morning glory, as viewed near Itanhaem, Brazil on November 11, 2013. This is a type of roll cloud -- a detached storm cloud. In northern Australia, Morning Glories occur in the Gulf of Carpentaria during the month of October with some regularity. Though their formation isn't completely understood, mesoscale circulation, such as stiff sea/land breezes appear to be crucial to their development. In different areas of the world, they've been observed to form at times of day other than morning. Strong winds can accompany the passage of these tubular clouds so beachgoers should heed their approach. Compare this cloud to the Earth Science Picture of the Day for October 2, 2014 showing a rolling fog.
Photo Details: Camera: Canon PowerShot SX40 HS; Focal Length: 4.3mm; Aperture: f/4.0; Exposure Time: 0.0031 s (1/320); ISO equiv: 100.