Well behind a surface cold front, a band of midday showers formed along the elevated frontal surface, tapping some residual moisture, and rooted in the lower middle troposphere. Individual showers raced off to the northeast, nearly along the axis of the convective band. Their rain shafts got so strongly tilted both from the parent showers' fast movement aloft, and stiff northerly to … [Read more...]
Supercell Sky, St. Onge
Aside from being one of the most spectacular scenes of the 2022 chase season for me, this look at a supercell also offered a veritable kaleidoscope of cloud forms and processes, all at once. The main mesocyclone, with broadly rotating wall cloud, churned along to the left of the lightning flash, and sported a nice "RFD cut", where the occlusion downdraft (the inward-directed part of the … [Read more...]
Young Mesocyclone at School
Two abandoned schoolhouses, and the fencing between them, fortuitously pointed many lines at a rapidly organizing mesocyclone, with a wall cloud condensed partly of rain-cooled forward-flank air. Half an hour before, this storm didn't exist; it erupted rapidly from deep convective towers lining a horizontal convective roll (HCR). The HCR, in turn, had existed for a long time, but its lift … [Read more...]
Streak and Sparks
Two of numerous cloud-to-ground flashes I shot that night, these blasted through a mix of rain and dust to overheat patches of the desert floor briefly. The lower segment of the left channel penetrated the divergent lower part of a rain core, that spread outward from the vertical plane of its prior descent. Meanwhile, a vehicle traveled southward along a state highway quickly, all the way across … [Read more...]
Striated Twilight Supercell
Merging of a newer storm's updraft region, at left, with a longstanding one, at right, started while we were nearly under the latter, so we decided to bail southeast out of the projected collision notch for some wide structure views, figuring it could be a forced-ascent festival of striated cloud forms. That, it was—with bands across, right, left, and above, sweeping across the sky in … [Read more...]
Downtown Storm Incoming, OKC
Unplanned more than a few minutes in advance, therefore greatly appreciated, this remarkable scene greeted me on the front side of a band of thunderstorms rolling into Oklahoma City. I had been returning from a two-day chase trip to southeastern Kansas, just trying to beat the rain home on day three. Rounding the corner of I-35 and I-40 east of downtown OKC, I gazed straight into some of my … [Read more...]
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