AbstractAmong forecasters and storm chasers, there is a common perception that hodographs with counterclockwise curvature or kinking in the midlevels (sometimes called backing aloft or veer–back–veer profiles) are unfavorable for long-lived supercells and tornadoes. This study reviews and then evaluates several possible explanations for the purported negative effect of backing aloft. As a controlled hypothesis test, simulated supercells are initiated within a range of idealized wind profiles, many of which include representative counterclockwise kinks or bends in their hodographs. In these experiments, the short-term, direct impacts of backing aloft upon supercell maintenance are generally small. Backing aloft does modify the component of vertical accelerations linked to updraft–shear interactions, but these changes generally occur well above the level of free convection (LFC), and they are generally offset by substantial upward accelerations attributable to other processes (e.g., within-storm rotation and positive buoyancy). In these simulations, the longevity of isolated supercells seems to be most directly hindered in environments with very low storm-relative helicity (SRH) or else (for a line of supercells) substantial along-line flow in the upper troposphere. Although these two disrupting properties can accompany backing aloft, they are neither universally nor exclusively associated with it. From the perspective of storm dynamics, it seems advisable to focus on SRH and along-line flow in the environment, rather than the presence (or absence) of backing aloft in the wind profile.
Weather and Forecasting – American Meteorological Society
Published: Oct 15, 2017
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera