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Climate characteristics of higher atmospheric levels
Kuchař, Aleš ; Pišoft, Petr (advisor) ; Žák, Michal (referee)
This work investigates the climatic characteristics of the upper atmosphere. The characteristics that were analyzed include air temperature, speed and direction of the zonal wind, geopotential height and total column of ozone or its mixing ratio in the individual levels of pressure. Data from projects NCEP/NCAR and ERA-40 reanalysis were used for these purposes. The data are present in a graphic form, particularly in the average monthly maps during 1978−2007 for the first one and during 1978−2002 for the second one with azimuthal projection for each hemisphere for the levels of 300, 100, 10 and 30 hPa. The results obtained are described and interpreted by a research of available literature.
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Contemporary possibilities of atmosphere lightning detection
Nettl, Tomáš ; Žák, Michal (advisor) ; Pišoft, Petr (referee)
The aim of this thesis is to make a survey about posibilities of detection atmosferic discharges, describe their principles and properties. The other aim of thesis is comparing the systems CELDN and LINET. These two systems cover the area of Czech Republic. The first part of this work concerns of basic characteristic of flashes and electric properties of the atmosphere. The basic model of air discharges distribution in a storm and an electric field around is mentioned. Then the thesis describes the basic flash detection systems and the methods of detection.The end of the work describes systems covering Czech Republic - CELDN and LINET. Also basic characteristics of these systems derived from real data are discussed.
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Utilization of Radar Echo Extrapolation for Quantitative Precipitation Forecast
Frolík, Petr ; Novák, Petr (advisor) ; Žák, Michal (referee)
Title: Utilization of radar echo extrapolation for quantitative precipitation forecast Author: Petr Frolík Department: Department of Meteorology and Enviroment Protection Supervisor: RNDr. Petr Novák, PhD., ČHMÚ Supervisor's e-mail address: petr_novak@chmi.cz Abstract: At present time weather radar data are essential for national meteorological services. Utilization of this data for quantitative precipitation forecast and severe weather prediction for short period (nowcasting) becomes more and more common. Increasing interest for quantitative precipitation forecasts can be noticed in hydrological applications, where it can give early warning on flash floods and can improve large scale precipitation forecasts. This paper verifies usability of COTREC nowcasting method based on extrapolation of radar echo for quantitative precipitation forecast. Quality of COTREC forecast up to 3 hours was investigated on data from 1.4.2006 to 30.9.2006. Comparison of COTREC method with Aladin NWP model forecasts was also made. Hourly mean precipitation estimates on catchments were chosen for comparison because of verification focused mainly on utilization of the forecasts in hydrological applications. Forecasted precipitation estimates were compared with optimal operationally available precipitation estimate - adjusted radar...
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Multimedia Overview of Synoptic Meteorology
Pokorný, Michal ; Žák, Michal (advisor) ; Bednář, Jan (referee)
This diploma thesis contains an overview of the synoptic meteorology, from the so called Norwegian meteorological school and its interlacing with more modern concepts. It deals with air masses, atmospheric fronts and pressure systems. Further, the overview of latter conceptual models of atmospheric fronts is presented. It shows using of satellite and radar measurements in synoptical praxis, as well. The first chapter introduces formation of air masses and apportionment of air masses. It notices transformation of air masses, too. The second chapter deals with basic clasification of atmospheric fronts. Fronts are shown with help of satelite and radar images. Creation and development of pressure systems follows.
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Tropical cyclones - what do we know about them and how can they be forecasted?
Rulfová, Zuzana ; Žák, Michal (advisor) ; Pišoft, Petr (referee)
Nazev prace: Tropicke cyklony - co o nich dnes vime a jak je unu'me pfedpovidat Autor: Zu/aua Rnlfova Katedra (ustav): Kaledva meteoiologie a oclnaiiy prostfedi Vedonci bakalafske pnice: Mgr. Michal Zak, Ph.D. e-mail vodonciho: Midial.Zak'J'Tnff.cimi.cz Abstrakt: Talc* prace shrnuje soueasne inforniaee o /ivuUiini cA'kln tropicke cyklouy a jejich ucincicli na mofi a pri dcjsazeni pcviiiny. Json x,d.e popsany iiejcastf\jsi oblasti vyskytu, iejicli poimciiiovaiii v jediiotlivych oblastech a. jejich klaaifikaco podlo in- ttnrxity. Dale u1)sahuic sledovaci a pfedpovedni inetody a jejich uspcsnost. Na konci pracc je uvcden prcliltxl vyzna.iunych iropickych cykloii. Klicova slova: tropicka cyklony, cyklogencze. puzorovam, pfedpovod' Title: Tropical (.cyclones - what, do \\v know about them and how can they be fore- casted? Author: Zuzana Rnlfovd Department: Tho Department of Meteorology and Environment. Protection Supervisor: Mgr. Alichnl Zak, Ph.D. Supervisor's e-mail address: Michal.Zak^mfi'.cnni.c/, Abstract: This thesis summarizes the recently information about life cycle oftropical cyclone and its effects out at sea. and before and after landfall. There are described the most common areas of occurrence ot tropical cyclones, their naming in these areas and their intensity classifications. Then this thesis...
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Utilization of Radar Echo Extrapolation for Quantitative Precipitation Forecast
Frolík, Petr ; Novák, Petr (advisor) ; Žák, Michal (referee)
At present time weather radar data are essential for national meteorological services. Utilization of this data for quantitative precipitation forecast and severe weather prediction for short period (nowcasting) becomes more and more common. Increasing interest for quantitative precipitation forecasts can be noticed in hydrological applications, where it can give early warning on flash floods and can improve large scale precipitation forecasts. This paper verifies usability of COTREC nowcasting method based on extrapolation of radar echo for quantitative precipitation forecast. Quality of COTREC forecast up to 3 hours was investigated on data from 1.4.2006 to 30.9.2006. Comparison of COTREC method with Aladin NWP model forecasts was also made. Hourly mean precipitation estimates on catchments were chosen for comparison because of verification focused mainly on utilization of the forecasts in hydrological applications. Forecasted precipitation estimates were compared with optimal operationally available precipitation estimate - adjusted radar estimate combined with available raingauge measurements.
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