Observations of vertical wind shear heterogeneity in convective boundary layers

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Dual-Doppler wind syntheses from mobile radar observations obtained during the International H2O Project document some of the spatial variability of vertical wind profiles in convective boundary layers. Much of the variability of popular forecasting parameters such as vertical wind shear magnitude and storm-relative helicity is thought to result from pressure and temperature gradients associated with mesoscale boundaries (e.g., drylines, outflow boundaries, fronts). These analyses also reveal substantial heterogeneity even in the absence of obvious mesoscale wind shifts - in regions many might have classified as "horizontally homogeneous" with respect to these parameters in the past. This heterogeneity is closely linked to kinematic perturbations associated with boundary layer convection. When a mean wind is present, the large spatial variability implies significant temporal variability in the vertical wind profiles observed at fixed locations, with the temporal variability increasing with mean wind speed. Significant differences also can arise between true hodographs and "pseudohodographs" obtained from rawinsondes that are advected horizontally as they ascend. Some possible implications of the observed heterogeneity with respect to forecasting and simulating convective storms also are discussed.

Original languageEnglish (US)
Pages (from-to)843-861
Number of pages19
JournalMonthly Weather Review
Volume135
Issue number3
DOIs
StatePublished - Mar 1 2007

Fingerprint

convective boundary layer
wind shear
wind profile
pressure gradient
temperature gradient
outflow
boundary layer
kinematics
wind velocity
convection
perturbation
radar
parameter

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

@article{b68639ebde2d4750b3e01d893baecacf,
title = "Observations of vertical wind shear heterogeneity in convective boundary layers",
abstract = "Dual-Doppler wind syntheses from mobile radar observations obtained during the International H2O Project document some of the spatial variability of vertical wind profiles in convective boundary layers. Much of the variability of popular forecasting parameters such as vertical wind shear magnitude and storm-relative helicity is thought to result from pressure and temperature gradients associated with mesoscale boundaries (e.g., drylines, outflow boundaries, fronts). These analyses also reveal substantial heterogeneity even in the absence of obvious mesoscale wind shifts - in regions many might have classified as {"}horizontally homogeneous{"} with respect to these parameters in the past. This heterogeneity is closely linked to kinematic perturbations associated with boundary layer convection. When a mean wind is present, the large spatial variability implies significant temporal variability in the vertical wind profiles observed at fixed locations, with the temporal variability increasing with mean wind speed. Significant differences also can arise between true hodographs and {"}pseudohodographs{"} obtained from rawinsondes that are advected horizontally as they ascend. Some possible implications of the observed heterogeneity with respect to forecasting and simulating convective storms also are discussed.",
author = "Paul Markowski and Richardson, {Yvette Pamela}",
year = "2007",
month = "3",
day = "1",
doi = "10.1175/MWR3334.1",
language = "English (US)",
volume = "135",
pages = "843--861",
journal = "Monthly Weather Review",
issn = "0027-0644",
publisher = "American Meteorological Society",
number = "3",

}

Observations of vertical wind shear heterogeneity in convective boundary layers. / Markowski, Paul; Richardson, Yvette Pamela.

In: Monthly Weather Review, Vol. 135, No. 3, 01.03.2007, p. 843-861.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observations of vertical wind shear heterogeneity in convective boundary layers

AU - Markowski, Paul

AU - Richardson, Yvette Pamela

PY - 2007/3/1

Y1 - 2007/3/1

N2 - Dual-Doppler wind syntheses from mobile radar observations obtained during the International H2O Project document some of the spatial variability of vertical wind profiles in convective boundary layers. Much of the variability of popular forecasting parameters such as vertical wind shear magnitude and storm-relative helicity is thought to result from pressure and temperature gradients associated with mesoscale boundaries (e.g., drylines, outflow boundaries, fronts). These analyses also reveal substantial heterogeneity even in the absence of obvious mesoscale wind shifts - in regions many might have classified as "horizontally homogeneous" with respect to these parameters in the past. This heterogeneity is closely linked to kinematic perturbations associated with boundary layer convection. When a mean wind is present, the large spatial variability implies significant temporal variability in the vertical wind profiles observed at fixed locations, with the temporal variability increasing with mean wind speed. Significant differences also can arise between true hodographs and "pseudohodographs" obtained from rawinsondes that are advected horizontally as they ascend. Some possible implications of the observed heterogeneity with respect to forecasting and simulating convective storms also are discussed.

AB - Dual-Doppler wind syntheses from mobile radar observations obtained during the International H2O Project document some of the spatial variability of vertical wind profiles in convective boundary layers. Much of the variability of popular forecasting parameters such as vertical wind shear magnitude and storm-relative helicity is thought to result from pressure and temperature gradients associated with mesoscale boundaries (e.g., drylines, outflow boundaries, fronts). These analyses also reveal substantial heterogeneity even in the absence of obvious mesoscale wind shifts - in regions many might have classified as "horizontally homogeneous" with respect to these parameters in the past. This heterogeneity is closely linked to kinematic perturbations associated with boundary layer convection. When a mean wind is present, the large spatial variability implies significant temporal variability in the vertical wind profiles observed at fixed locations, with the temporal variability increasing with mean wind speed. Significant differences also can arise between true hodographs and "pseudohodographs" obtained from rawinsondes that are advected horizontally as they ascend. Some possible implications of the observed heterogeneity with respect to forecasting and simulating convective storms also are discussed.

UR - http://www.scopus.com/inward/record.url?scp=34047235469&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34047235469&partnerID=8YFLogxK

U2 - 10.1175/MWR3334.1

DO - 10.1175/MWR3334.1

M3 - Article

AN - SCOPUS:34047235469

VL - 135

SP - 843

EP - 861

JO - Monthly Weather Review

JF - Monthly Weather Review

SN - 0027-0644

IS - 3

ER -