Skip to main content
U.S. flag

An official website of the United States government

Dot Gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

A Composite Perspective On Bore Passages During The Pecan Campaign


Atmospheric bores have been shown to have a role in the initiation and maintenance of elevated convection. Previous observational studies of bores have been case studies of more notable events. However, this creates a selection bias towards extraordinary cases while discussions of the differences between bores that favor convective initiation and maintenance and bores that do not are lacking from the literature. This study attempts to fill that gap by analyzing a high-temporal-resolution thermodynamic profile composite of eight bores observed by multiple platforms during the Plains Elevated Convection At Night (PECAN) campaign in order to assess the impact of bores on the environment. The time-height cross-section of the potential temperature composite displays quasi-permanent parcel displacements up to 900 m with the bore passage. Low-level lifting is shown to weaken the capping inversion and reduce convective inhibition (CIN) and the level of free convection (LFC). Additionally, low-level water vapor increases by about 1 g kg?1 in the composite mean. By assessing variability across the eight cases, it is shown that increases in low-level water vapor result in increases to Convective Available Potential Energy (CAPE), while drying results in decreased CAPE. Most cases resulted in decreased CIN and LFC height with the bore passage, but only some cases resulted in increased CAPE. This suggests that bores will increase the potential for convective initiation, but future research should be directed toward better understanding cases that result in increased CAPE as those are the types of bores that will increase severity of convection.

Article / Publication Data
Available Metadata
Accepted On
February 07, 2019
Fiscal Year
Peer Reviewed
Publication Name
Monthly Weather Report
Published On
April 01, 2019
Publisher Name
American Meteorological Society
Print Volume
Print Number
Page Range
Submitted On
August 15, 2018


Authors who have authored or contributed to this publication.