Uploaded August 2024 | Updated September 2026, 2 weeks ago
In-depth meteorological breakdown of the incredible tornadic supercell that produced two significant tornadoes, including an anticyclonic one, near Hollister, OK, on the evening of April 30, 2024. The day began as a fairly conditional setup without a tornado risk outlined in southwest Oklahoma, but concerns over storm initiation were soon quelled, and intense supercells erupted along the dryline. In this video, we'll take a deep dive into the meteorology behind the Hollister supercell, including some reasons why storm initiation became much more likely with time, the unique behaviors that led up to tornadogenesis, and a discussion of the unusually intense and long-lived anticyclonic tornado that this storm spawned.
Thumbnail image from Jared Trupp (X: @JaredTrupp).
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Contents
0:00 Introduction
2:10 Meteorological analysis
12:34 Hollister supercell analysis begins
12:53 Dual mesocyclone structure and its role in tornadogenesis
15:53 Weak-echo column
17:12 Discussion of tornado intensity from radar data
19:57 Anticyclonic tornado
23:41 Proximity sounding analysis
26:22 Wrap-up
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Become a Patreon member today to support the channel: patreon.com/convectivechronicles
Facebook: facebook.com/ConvectiveChronicles
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Resources
NWS Norman event page: weather.gov/oun/events-20240430
Smith et al. (2020): "WSR-88D Tornado Intensity Estimates. Part II: Real-Time Applications to Tornado Warning Time Scales" - journals.ametsoc.org/view/journals/wefo/35/6/waf-d-20-0011.1.xml?tab_body=pdf
Bluestein et al. (2016): "Doppler Radar Observations of Anticyclonic Tornadoes in Cyclonically Rotating, Right-Moving Supercells" - journals.ametsoc.org/view/journals/mwre/144/4/mwr-d-15-0304.1.xml?tab_body=pdf
Brown and Knupp (1980): "The Iowa Cyclonic-Anticyclonic Tornado Pair and Its Parent Thunderstorm" - journals.ametsoc.org/view/journals/mwre/108/10/1520-0493_1980_108_1626_ticatp_2_0_co_2.xml?tab_body=pdf
Nixon and Allen (2021): "Anticipating Deviant Tornado Motion Using a Simple Hodograph Technique" - journals.ametsoc.org/view/journals/wefo/36/1/WAF-D-20-0056.1.xml?tab_body=pdf
In-depth meteorological breakdown of the incredible tornadic supercell that produced two significant tornadoes, including an anticyclonic one, near Hollister, OK, on the evening of April 30, 2024. The day began as a fairly conditional setup without a tornado risk outlined in southwest Oklahoma, but concerns over storm initiation were soon quelled, and intense supercells erupted along the dryline. In this video, we'll take a deep dive into the meteorology behind the Hollister supercell, including some reasons why storm initiation became much more likely with time, the unique behaviors that led up to tornadogenesis, and a discussion of the unusually intense and long-lived anticyclonic tornado that this storm spawned.
Thumbnail image from Jared Trupp (X: @JaredTrupp).
----------------------------------------
Contents
0:00 Introduction
2:10 Meteorological analysis
12:34 Hollister supercell analysis begins
12:53 Dual mesocyclone structure and its role in tornadogenesis
15:53 Weak-echo column
17:12 Discussion of tornado intensity from radar data
19:57 Anticyclonic tornado
23:41 Proximity sounding analysis
26:22 Wrap-up
----------------------------------------
Become a Patreon member today to support the channel: patreon.com/convectivechronicles
Facebook: facebook.com/ConvectiveChronicles
X: twitter.com/ConvChronicles
Instagram: instagram.com/convectivechronicles
----------------------------------------
Resources
NWS Norman event page: weather.gov/oun/events-20240430
Smith et al. (2020): "WSR-88D Tornado Intensity Estimates. Part II: Real-Time Applications to Tornado Warning Time Scales" - journals.ametsoc.org/view/journals/wefo/35/6/waf-d-20-0011.1.xml?tab_body=pdf
Bluestein et al. (2016): "Doppler Radar Observations of Anticyclonic Tornadoes in Cyclonically Rotating, Right-Moving Supercells" - journals.ametsoc.org/view/journals/mwre/144/4/mwr-d-15-0304.1.xml?tab_body=pdf
Brown and Knupp (1980): "The Iowa Cyclonic-Anticyclonic Tornado Pair and Its Parent Thunderstorm" - journals.ametsoc.org/view/journals/mwre/108/10/1520-0493_1980_108_1626_ticatp_2_0_co_2.xml?tab_body=pdf
Nixon and Allen (2021): "Anticipating Deviant Tornado Motion Using a Simple Hodograph Technique" - journals.ametsoc.org/view/journals/wefo/36/1/WAF-D-20-0056.1.xml?tab_body=pdf
