Event Title

Central Pressure Tendency Analysis of Eastern North America Occluded Cyclones

Presenter Information

Joseph Ricciotti, Meteorology

Faculty Sponsor(s)

Eric Hoffman

Abstract

Introductory meteorology textbooks introduce the topic of the life cycle of extratropical cyclones (ECs) using the Norwegian Cyclone Model (NCM). The final stage of EC development according to the NCM are occlusions, which are assumed to coincide with cyclolysis (end of central pressure deepening). Recent literature has challenged this assumption, suggesting central pressure deepening may continue to occur post-occlusion. However, there are no studies that have explicitly examined the central pressure tendencies of occluded cyclones. Therefore, this research investigated the central pressure behavior of post-occlusion ECs. One year of weather prediction center (WPC) surface analysis data was used to track and identify occlusions over the eastern Continental United States (CONUS). In addition to climatological information (e.g., number and duration of occlusions), the central pressure tendency of cyclones was captured using deepening rate, total central pressure tendency, initial central pressure tendency, and final central pressure tendency to better understand the post-occlusion central pressure behavior. Results showed that 43% of cyclones exhibited strictly deepening (lowering pressure) behavior during the occluded stage while 26% of cyclones exhibited strictly filling (rising pressure) behavior during the occluded stage.

Location

Hartman Union Building Courtroom

Start Date

5-2-2019 3:00 PM

End Date

5-2-2019 4:00 PM

This document is currently not available here.

Share

COinS
 
May 2nd, 3:00 PM May 2nd, 4:00 PM

Central Pressure Tendency Analysis of Eastern North America Occluded Cyclones

Hartman Union Building Courtroom

Introductory meteorology textbooks introduce the topic of the life cycle of extratropical cyclones (ECs) using the Norwegian Cyclone Model (NCM). The final stage of EC development according to the NCM are occlusions, which are assumed to coincide with cyclolysis (end of central pressure deepening). Recent literature has challenged this assumption, suggesting central pressure deepening may continue to occur post-occlusion. However, there are no studies that have explicitly examined the central pressure tendencies of occluded cyclones. Therefore, this research investigated the central pressure behavior of post-occlusion ECs. One year of weather prediction center (WPC) surface analysis data was used to track and identify occlusions over the eastern Continental United States (CONUS). In addition to climatological information (e.g., number and duration of occlusions), the central pressure tendency of cyclones was captured using deepening rate, total central pressure tendency, initial central pressure tendency, and final central pressure tendency to better understand the post-occlusion central pressure behavior. Results showed that 43% of cyclones exhibited strictly deepening (lowering pressure) behavior during the occluded stage while 26% of cyclones exhibited strictly filling (rising pressure) behavior during the occluded stage.