PPT-Tropical Convection: A Half Century Quest for Understanding

Bjerknes Memorial Lecture AGU San Francisco 4 December 2012 Robert Houze University of Washington A personal story of three great field campaigns and the evolution of meteorological satellites . 75 375 6 825 10 1175 Toilets Start 6 825 Finish Event Start Line Key North Half Marathon Course Map not to scale Locations are approximate Course subject to change with out notice www AllCommunityEvents com Israel Jirak, Steve Weiss, and Chris . Melick. . Storm Prediction Center. WoF Workshop, April 3, 2014. Convection-allowing ensembles (. ~. 4-km grid spacing) can provide important information to forecasters regarding the uncertainty of storm intensity, mode, location, timing, etc. on the outlook to watch scale. s is in the half-open-half-closed interval [lowEnough, tooHigh) where the end-points are integers For a constant property, laminar flow a . similarity solution. exists for the flow field . u. (. y. ). local boundary layer thickness. local skin friction coefficient. average skin friction coefficient. vs. . Remote effect. Sourav Taraphdar. 1. Collaborators. :. 1. . Fuqing. Zhang, . Yonghui. . Weng. , Michael (Yue) Ying. 2. . Shuguang. Wang. 3. Juan . Fang. 1. Department of Meteorology, The Pennsylvania State University, . Free Convection (or Natural Convection). fluid motion . induced by . buoyancy forces. buoyancy forces . arise when there are . density gradients . in a fluid and a . body force. . proportional to density arises . reporter : Lin . Ching. Based on . Dunkerton, T. J., M. T. Montgomery, and Z. Wang, 2009: Tropical . cyclogenesis. in a tropical wave critical layer: Easterly waves. . Atmos. Chem. Phys.. , . 9. , 5587–5646.. Lesson 6. What is the MJO?. Large-scale disturbance of deep convection and winds that controls up to half of the variance of tropical convection in some regions. Now known to be a major propagator of weather systems. 1. V. – upstream velocity (approaching velocity). u. . - free stream velocity (relative velocity compare to the body). Chapter 7 : Convection – External Flow : Cylinder in cross flow . 2. Re. Conduction Convection . Radiation. Types of Heat transfer. Heat Transfer. Heat can be transferred in 3 ways. Conduction. Convection. Radiation. Heat flow depends on the temperature difference – . flows from hot to cold. Jeremiah Brown and Ralph F. Milliff. NWRA, Colorado Research Associates (CoRA) Division. Boulder, CO USA. IOVWST Barcelona, May 2010. Multi-Platform Analyses of MJO Convection on Sub-Daily Timescales. Why is it windy at the seaside?. Cold air sinks. Where is the freezer compartment put in a fridge?. Freezer compartment. It is put at the top, because cool air sinks, so it cools the food on the way down.. GOES infrared . b. rightness temperatures (BT) . are . used to . objectively identify . overshooting tops in tropical . convection (TOTs). TOT heights are . assigned using TOT BT and NWP . profiles.. Massachusetts Institute of Technology. Two Points of View. Macroscopic. : What sets the frequency of tropical cyclones on the planet? Are tropical cyclones agents in a system that maintains itself in some critical state?.