Journal ArticleDOI
The life cycle of thunderstorm gust fronts as viewed with Doppler radar and rawinsonde data
TLDR
In this paper, a horizontal roll detected in the reflectivity pattern resulting from airflow that is deflected upward by the ground, while carrying some of the smaller precipitation ahead of the main echo core of the squall line was detected.Abstract:
This paper presents the time-dependent analysis of the thunderstorm gust front with the use of Project NIMROD data. RHI cross sections of reflectivity and Doppler velocity are constructed to determine the entire vertical structure. The life cycle of the gust front is divided into four stages: (1) the formative stage; (2) the early mature stage; (3) the late mature stage; and (4) the dissipation stage. A new finding is a horizontal roll detected in the reflectivity pattern resulting from airflow that is deflected upward by the ground, while carrying some of the smaller precipitation ahead of the main echo core of the squall line. This feature is called a 'precipitation roll'. As determined from rawinsonde data, the cold air behind the gust front accounts for the observed surface pressure rise. Calculations confirm that the collision of two fluids produce a nonhydrostatic pressure at the leading edge of the outflow. The equation governing the propagation speed of a density current accurately predicts the movement of the gust front.read more
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Book ChapterDOI
Fronts, Jet Streams and the Tropopause
Melvyn A. Shapiro,Daniel Keyser +1 more
TL;DR: In this article, the authors focused on the structural characteristics of fronts and their associated jet streams near the tropopause, and on the diagnosis of the frontogenetic processes and secondary circulations governing their life cycles.
Journal ArticleDOI
High-Resolution Simulation of Shallow-to-Deep Convection Transition over Land
TL;DR: In this paper, a high-resolution simulation of shallow-to-deep convection transition based on idealization of observations made during the Large-Scale Biosphere-Atmosphere (LBA) experiment in Amazonia, Brazil, during the Tropical Rainfall Measuring Mission (TRMM)-LBA mission on 23 February.
Journal ArticleDOI
A Review of Convection Initiation and Motivation for IHOP_2002
TL;DR: The International H2O Project (IHOP_2002) included four complementary research components: quantitative precipitation forecasting, convection initiation, atmospheric boundary layer processes, and instrumentation as mentioned in this paper.
Journal ArticleDOI
Cold Pools and MCS Propagation: Forecasting the Motion of Downwind-Developing MCSs
TL;DR: In this paper, the main factors that affect the direction of propagation and overall movement of surface-based mesoscale convective systems (MCSs) are discussed, and an updated technique that may be used to forecast the short-term motion of MCS centroids based on these concepts is introduced.
Journal ArticleDOI
Microburst Wind Structure and Evaluation of Doppler Radar for Airport Wind Shear Detection
TL;DR: In this paper, the horizontal and vertical structure of airflow within microbursts has been determined using Doppler weather radar data from the Joint Airport Weather Studies (JAWS) Project.