Thursday, August 5, 2010
Mini-Hurricane Over Vancouver Island!
Here is an amazing radar image this morning (thanks to blog-follower Paul for bringing it to my attention). Looks just like a mini-hurricane with rainbands! The animation is even more impressive:
and here it is in the visible satellite image:
The origin? The atmosphere this morning is relatively unstable (thus convection) and there is an atmospheric vortex centered over Vancouver Island. You could see the signs of the instability yesterday: thunderstorms over the Cascades with some mid-level convection over the western lowlands. The "hurricane" is probably not forced by the terrain...the atmospheric circulation, forced by the larger scale flow, happens to be located over the island.
Posted by Cliff Mass at 10:33 AM