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RISA Visualization of the Global Dynamic Tropopause
Publisher: American Meteorological Society
Abstract: A 20?yr loop of the global tropopause, defined in terms of potential vorticity (PV), is constructed using the NCEP?NCAR reanalysis dataset. This method of visualizing observed upper?tropospheric dynamics is useful for ...
Piecewise Tendency Diagnosis of Dynamical Processes Governing the Development of an Upper-Tropospheric Mobile Trough
Publisher: American Meteorological Society
Abstract: The intensification and evolution of midlatitude upper-tropospheric mobile troughs may be viewed in terms of the isentropic advection and deformation of the tropopause potential vorticity gradient. The potential vorticity ...
The Convective Instability Pathway to Warm Season Drought in Texas. Part I: The Role of Convective Inhibition and Its Modulation by Soil Moisture
Publisher: American Meteorological Society
Abstract: This research is designed to investigate how convective instability influences monthly mean precipitation in Texas in the summertime and to examine the modulation of convective instability and precipitation by local and ...
The Convective Instability Pathway to Warm Season Drought in Texas. Part II: Free-Tropospheric Modulation of Convective Inhibition
Publisher: American Meteorological Society
Abstract: This study is concerned with the modulation by convective instability of summertime precipitation in Texas as a mechanism for maintaining or enhancing drought. The important role of convective inhibition (CIN), its dependence ...
Sensitivity of Monthly Convective Precipitation to Environmental Conditions
Publisher: American Meteorological Society
Abstract: Identifying dynamical and physical mechanisms controlling variability of convective precipitation is critical for predicting intraseasonal and longer-term changes in warm-season precipitation and convectively driven ...
Using Tropopause Maps to Diagnose Midlatitude Weather Systems
Publisher: American Meteorological Society
Abstract: The use of potential vorticity (PV) allows the efficient description of the dynamics of nearly balanced atmospheric flow phenomena, but the distribution of PV must be simply represented for ease in interpretation. ...
Effective Stratification for Pseudoadiabatic Ascent
Publisher: American Meteorological Society
Abstract: Effective stratification can be interpreted as the resistance to upward motion of saturated air parcels experiencing condensation. Previously published expressions for effective stratification conflict with each other, and ...
Low-Level Jet Development during a Numerically Simulated Return Flow Event
Publisher: American Meteorological Society
Abstract: The evolution of the southerly low-level jet (LLJ) during a return flow event is studied using output from the Penn State/NCAR Mesoscale Model (Version 4). Three geographically different southerly LLJs develop in the ...
Potential Vorticity Diagnosis of the Severe Convective Regime. Part II: The Impact of Idealized PV Anomalies
Publisher: American Meteorological Society
Abstract: Idealized numerical experiments are conducted to understand the effect of upper-tropospheric potential vorticity (PV) anomalies on an environment conducive to severe weather. Anomalies are specified as a single isolated ...