June 24, 2007 |  Supercell in Southeast MT
All photos © Copyright 2007 Matt Ziebell

Waking up in Devils Lake, ND, I planned on chasing near Bismarck as the cold front was to stall along a rough line from DVL-BIS-GCC.  Given the relatively short drive, I took my time packing up and once on the road I occasionally stopped to photograph these awesome convective outflow waves as they encountered a highly stable lower layer.

Once in Bismarck, I pulled up the 18Z sounding and immediately ditched this area as a target given a monster cap.  I monitored obs along the front and eventually realized that if I was to chase anything today I needed to be much farther west where upslope forcing would be available.  So, I began a grueling drive west to Miles City, MT where upon arrival at ~1730 MDT there was limited evidence to suggest the cap was budging.  Not good!

1029 CDT


  
I eventually drifted south of Miles City to Tongue River Rd where I monitored some meager convection developing in northeast WY.  Later I observed an impressive TCu cycling well to my NW in Garfield County, but this too would fall short of becoming something better.  Any upslope convection to my west was looking dismal, so I went back to Miles City thinking the day was shot.  While en route, I noticed a few worthwhile radar returns explode in Wheatland County.  I shot west on I-94 to HWY 12 where I was eventually presented with this view.

2004 MDT


 
Looking west at a supercell approaching Roundup, MT.  There's actually two updraft structures with the rightmost showcasing a bell-shaped base.  I was still a good 30+ miles away from this and it seemed forever before I arrived within a reasonable viewing range!

2025 MDT


  
Here's a better view of the dual cell structure.  On radar, the northern (right) cell was rotating quite vividly with very little rotation evident within the southern cell.

2032 MDT


 
Fantastic anvil contrast and colors with a half moon (aka quarter moon) visible in the upper left.

2033 MDT


  
As this is Montana, road options are typically few and far between.  Upon arrival in Melstone, I proceeded south on a washboard dirt road called Melstone-Custer Rd with the inent of positioning myself in the SE quadrant of this storm.  Unfortunately, the gravel chunks on this road were so large that my progress slowed significantly.

2044 MDT


 
Looking west as the dual cell structure from earlier sure appeared to be undergoing a merger.

2047 MDT


  
Some nicely developed mammatus to the northeast.

2049 MDT


 
Looking south at the shelf cloud overtaking my road.  I was averaging only around 35 mph on this crummy dirt road and soon realized I'd be overtaken by the supercell.  I pulled over to document my certain demise with photos, but the hail never exceeded 2".  I still received a small crack in my windshield, but this was mere child's play compared to the 4.25" stones that fell near Roundup earlier this evening!

2108 MDT


 
  
Looking NW towards the distant, cyclonically-sheared portion of the updraft.

2108 MDT


 
Looking west at a menacing shelf cloud with a barrage of hailstones following on its heels.

2108 MDT


 
  
One more view before my I'm swallowed up!  On radar, the southern end of this structure was showing more prominence and would soon attain persistent rotation.

2109 MDT


 
After my dirt road merged with another crummy dirt road (310), I quickly found myself on the SW flank of the supercell.  I wanted to pull over and snap some structure and lightning shots in the faint twilight, but I still had a long ways to go before getting to the nearest paved east road...I-94 in Custer.

This shot was taken much later on near Forsyth.  The lightning show was incredible!

2225 MDT


 
  
2229 MDT

 
All these photos were taken on Sarpy Rd, just off I-94.  Why am I typing this, you ask?  Well, it was at this location where I almost backed my car into a barely visible pond overgrown by grass and weeds.  To make matters worse, the farm field entrance was quite narrow and I seriously misjudged the room available.  Upon stepping out of my car I noticed I was only a mere foot or two from the edge of a steep man-made pond!

2230 MDT


 
  
Looking NNE as the supercell continues its long journey across open ranch land.  This supercell would soon dissipate near Miles City allowing me a chance to recover from this exhaustive day full of driving, adrenaline and crappy dirt roads!

2235 MDT

 All photos © Copyright 2007 Matt Ziebell

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