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ETA initial sounding data for near Waupun, WI (12 miles north of supercell's track) at 7pm depicting adequate low-level shear and storm relative inflow. Actual CAPEs were around 1500 J/kg in this "tropical-ish" profile despite the ETA weighting a lower value - even with the Tv correction. Had the shear been any stronger, this buoyancy profile would have had an even harder time supporting the supercell. |
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The
initial view at 6:18pm looking NW while south of Beaver Dam, WI.
Note the inflow tail on the right and the wet RFD (hook region) to the
left of the updraft.
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The whole updraft took on a mothership appearance with multiple striations visible. |
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By
6:35pm, a meso occlusion was still visible with dense RFD precip.
A shelf cloud lies along the southeastern flank of the eroding meso.
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RFD notch on the left, tail cloud on the right and the mesocyclone above. CGs were very frequent in the vault region of this supercell. |
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The
view looking south. Under the meso...quite literally!
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Six miles east of Beaver Dam, the best of 3 wall clouds this evening took shape around 7:10pm. |
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The
wall cloud exhibited rotation only for a couple of minutes despite obvious
rotation aloft.
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My excitement blurred this zoom-in of the wall cloud. |
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This
was now more of a hybrid/classic supercell since the precip in the RFD
had terminated. Several CGs were still noted in the vault region.
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The southern flank of the meso arced SW into a distant, trailing cold pool boundary. |
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The
final occlusion was ~10 miles east of Juneau, WI near 7:30pm. A small
appendage was developing here that mimicked a funnel, though it was tough
to ID rotation. After a casual viewing of my video 2.5yrs after the
fact, I'm nearly convinced this was a funnel given its persistence, the
nearby RFD notch and several CGs around it.
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All
photos copyright © Matt Ziebell
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