Sunday, August 11, 2013

Slow Moving Boundary

Storms developing along an extremely slow moving cold front on the 7th eventually collapsed into an equally slow moving striated outflow boundary. This boundary provided several panorama opportunities before passing overhead with minimal activity only to trigger new development to the south after sunset.

Northeast Macon County

Northwest Macon County

From southeast of Mt. Pulaski is where it became interesting for at one point while driving, I noticed a slender, semi-transparent tube extending to the ground along the slow moving gust front. It dissipated by the time I pulled over however, leading edge funnel clouds persisted. The outflow boundary was angled SE to NW and traveling S which I believe aided in enhancing low level shear under new updrafts to produce possible landspouts. Rotation was easily discernible and you can still see remnants of the tube as faint discoloration descending from the foremost area in the first image. Cool air spreading outward from the parent cell would undercut this feature and effectively shut down the entire process.

Facing north along I-72 as the previous storm rained itself out, the boundary continued south to generate new convection with lightning at dusk in Northern Christian County.

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