Low-Level Mesoscale and Cloud-Scale Interactions Promoting Deep Convection Initiation

Marquis, James N.; Varble, Adam C.; Robinson, Paul; Nelson, T. Connor; Friedrich, Katja

doi:10.1175/mwr-d-20-0391.1

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Low-Level Mesoscale and Cloud-Scale Interactions Promoting Deep Convection Initiation

2021
By Marquis, James N. ; Varble, Adam C. ; Robinson, Paul ; ...
Source: Monthly Weather Review, 149(8), 2473-2495

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Journal Title:

Monthly Weather Review
Personal Author:

Marquis, James N. ; Varble, Adam C. ; Robinson, Paul ; Nelson, T. Connor ; Friedrich, Katja

Marquis, James N. ; Varble, Adam C. ; Robinson, Paul ; Nelson, T. Connor ; Friedrich, Katja Less -
NOAA Program & Office:

NWS (National Weather Service) ; CIRA (Cooperative Institute for Research in the Atmosphere)

NWS (National Weather Service) ; CIRA (Cooperative Institute for Research in the Atmosphere) Less -
Description:

Data from scanning radars, radiosondes, and vertical profilers deployed during three field campaigns are analyzed to study interactions between cloud-scale updrafts associated with initiating deep moist convection and the surrounding environment. Three cases are analyzed in which the radar networks permitted dual-Doppler wind retrievals in clear air preceding and during the onset of surface precipitation. These observations capture the evolution of (i) the mesoscale and boundary layer flow, and (ii) low-level updrafts associated with deep moist convection initiation (CI) events yielding sustained or short-lived precipitating storms. The elimination of convective inhibition did not distinguish between sustained and unsustained CI events, though the vertical distribution of convective available potential energy may have played a role. The clearest signal differentiating the initiation of sustained versus unsustained precipitating deep convection was the depth of the low-level horizontal wind convergence associated with the mesoscale flow feature triggering CI, a sharp surface wind shift boundary, or orographic upslope flow. The depth of the boundary layer relative to the height of the LFC failed to be a consistent indicator of CI potential. Widths of the earliest detectable low-level updrafts associated with sustained precipitating deep convection were ~3–5 km, larger than updrafts associated with surrounding boundary layer turbulence (~1–3 km wide). It is hypothesized that updrafts of this larger size are important for initiating cells to survive the destructive effects of buoyancy dilution via entrainment.
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Atmospheric Science
Source:

Monthly Weather Review, 149(8), 2473-2495
DOI:

https://doi.org/10.1175/mwr-d-20-0391.1
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0027-0644;1520-0493;
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PDF
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American Meteorological Society
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Journal Article
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urn:sha256:3b49be5e48d2fb9fb8c7ba7709fe793f745a04bcdd67c88a795c6643dedda6ae
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Low-Level Mesoscale and Cloud-Scale Interactions Promoting Deep Convection Initiation

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