2004 August 10
Copyright 2004 Eric Nguyen
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Area Chased:  E CO

Discussion:   Scott Currens and I left at 9:30am from OUN heading towards our target in SE CO.  We took the northwest passage through Woodward and stopped south of Springfield to take pictures of the ASOS there and wait for storms.  We decided to ignore the weaker upslope stuff and head north to rock hard convection that was firing along the stationary front.  When we reached the storm it was still stationary, north of the front with strong east winds feeding into it.  It was LP in nature and began to lean over with time.  It had a rock hard cylinder updraft at the beginning, which was clearly rotating quite strong.  Occasionally we saw long rotating tubes on the edge of the updraft that would rope out and die.  When we thought the storm was about to die, it finally began to move southward and probably encountered some more unstable air, which caused the storm to rapid back-building and re-intensify.  That's when the storm began to develop a round smooth mother-ship looking updraft with a well defined RFD notch.  There were funnels that developed and small dust whirls underneath the wallcloud / funnel which we considered too weak to categorize it as anything more then a dust whirl.  This region then began to deteriorate and get undercut by some cooler outflow.  This storm propagated SSW along that outflow and continued to have a round smooth base as we left it near dark.  The sandy road network was good out there, however, if it had rained on us we would have been in trouble.  There were spots where flash flooding had cut large gaps in the roads from the previous days storms.  This resulted in some interesting driving maneuvers though those areas.  ;-)  It was a great chase and was worth the drive I think.  We drove almost exactly 1000 miles from 9:30am - 4:00am.


040810-1b.jpg (23980 bytes)      040810-2b.jpg (24334 bytes)      Rock hard rotating updraft southeast of Eads, CO.

040810-3b.jpg (27978 bytes)      040810-5b.jpg (24319 bytes)      040810-4b.jpg (24972 bytes)      040810-6b.jpg (24888 bytes)      The storm began to lose intensity and began to lean over.   We also observed a few thin tubes that are typically seen in LP's.

040810-7b.jpg (23018 bytes)      040810-8b.jpg (24502 bytes)      040810-9b.jpg (20391 bytes)      040810-10b.jpg (22524 bytes)      The storm began to move south and intensified.

040810-11b.jpg (24766 bytes)      040810-12b.jpg (20882 bytes)      040810-13b.jpg (20090 bytes)      040810-14b.jpg (20452 bytes)      The base grew and began to lower.  Inflow also began to pick up.

040810-15b.jpg (21295 bytes)      A well defined clear slot developed and occasional funnels were observed as well as dust whirls underneath.

040810-16b.jpg (23694 bytes)      040810-17b.jpg (20981 bytes)      The storm occasionally gusted out and developed a gorgeous shelf.   However, as it grew dark, the storm still had a nice round base looking west.

Copyright 2004 Eric Nguyen
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