Africa squall study west

Numerical Study of a West African Squall Line Using a ...

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The Meteosat-4 images are used to study the squall line over West Africa. This dataset is available in 3-hour time intervals at full spatial resolution (10 × 10 km) in the infrared channel. The input data used to initialize the model are from the ERA-40 fields of the ECMWF re-analyses [24]. Synoptic sounding data from the station of

Numerical Study of a West African Squall Line Using a ...

Initiation of West African squall lines | Request PDF

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Initiation of West African squall lines. ... This report is a climatological study of Southern Africa, a region that comprises The Republic of South Africa, Zimbabwe, Namibia, Lesotho, Swaziland ...

Initiation of West African squall lines | Request PDF

F(P)SO Global Responses in the West of Africa Squall ...

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Zhong and Curic [2] presented results of a transient response study of an FPSO moored in the West of Africa squall environment. Two treatments of the wind were examined: (1) 1-minute average wind ...

F(P)SO Global Responses in the West of Africa Squall ...

Squall Line Water Land Cover Karen I. Mohr l, R. David ...

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The purpose is not to simulate a particular squall line event as in a case study but to examine how model squall lines develop in different environments and isolate the factors that may be responsible for measurable differences in their water budgets. Previous studies using cloud-resolving models to simulate MCSs in West Africa have prescribed

Squall Line Water Land Cover Karen I. Mohr l, R. David ...

Numerical Study of a West African Squall Line Using a ...

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The squall line of 21-22 August 1992, documented during the HAPEX-Sahel campaign, is simulated using the regional atmospheric model (MAR). The simulated results are compared to observational data. The aim of this work is both to test the capacity of this model to reproduce tropical disturbances in West Africa and to use this model as a meteorological one.

Numerical Study of a West African Squall Line Using a ...

Squall - Wikipedia

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South Africa. Bull's Eye Squall is a term used offshore South Africa for a squall forming in fair weather. It is named for the appearance of the small isolated cloud marking the top of the squall. Philippines (West Pacific) In most parts of the country, squalls are ...

Squall - Wikipedia

2011 OMAE 49855 Response of FPSO System to Squalls

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The West Africa Gust Joint Industry Project (WAG JIP) [1, 2] was developed to collect measurements of squall time histories at various locations offshore West Africa and analyze the data. The database was used to estimate the extreme value distributions and consequently to predict the 100-year peak one minute mean wind speed.

2011 OMAE 49855 Response of FPSO System to Squalls

Squall Response Based Design of Floating Units in West Africa

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squall event usually lasts less than an hour at one given location), with often (but not always) large variations even a full reversal, of wind direction. In-situ wind measurements were analysed during Phase 1 of the West Africa Gust Joint Industry Project (WAG JIP, [1]), using

Squall Response Based Design of Floating Units in West Africa

The West African Sahel: A Review of Recent Studies on the ...

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The West African Sahel is well known for the severe droughts that ravaged the region in the 1970s and 1980s. Meteorological research on the region has flourished during the last decade as a result of several major field experiments. This paper provides an overview of the results that have ensued. A major focus has been on the West African monsoon, a phenomenon that links all of West Africa.

The West African Sahel: A Review of Recent Studies on the ...

Spatiotemporal variability of the relation between African ...

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[1] This study investigates the spatiotemporal variability of the relationship between African Easterly Waves (AEWs) and the lifecycle and characteristics of Squall Lines (SLs) over West Africa for the two six‐month periods May–October 1998 and 1999. In all, 81 AEWs have been tracked using analyses from the European Centre for Medium‐Range Weather Forecasts (ECMWF) and 344 SLs have been ...

Spatiotemporal variability of the relation between African ...

West African monsoon | Britannica.com

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West African monsoon: West African monsoon, a major wind system that affects West African regions between latitudes 9° and 20° N and is characterized by winds that blow southwesterly during warmer months and northeasterly during cooler months of the year. Although areas just outside of …

West African monsoon | Britannica.com

Leading and Trailing Anvil Clouds of West African Squall ...

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AbstractThe anvil clouds of tropical squall-line systems over West Africa have been examined using cloud radar data and divided into those that appear ahead of the leading convective line and those on the trailing side of the system. The leading anvils are generally higher in altitude than the trailing anvil, likely because the hydrometeors in the leading anvil are directly connected to the ...

Leading and Trailing Anvil Clouds of West African Squall ...

Spatiotemporal variability of the relation between African ...

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[1] This study investigates the spatiotemporal variability of the relationship between African Easterly Waves (AEWs) and the lifecycle and characteristics of Squall Lines (SLs) over West Africa for the two six-month periods May–October 1998 and 1999. In all, 81 AEWs have been tracked using analyses from the European Centre for Medium-Range

Spatiotemporal variability of the relation between African ...

Squall Response Based Design of Floating Units in West ...

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Squalls are one of the main issues for the design of West Africa floating units mooring systems. At the present time and due to the lack of more relevant information and models, squalls are represented by on site time series of time varying wind speed and relative heading. The first FPSO units were designed on the basis of a reduced Squall ...

Squall Response Based Design of Floating Units in West ...

TWO SYNOPTIC CASE STUDIES OF TROPICAL SQUALL LINES IN …

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TWO SYNOPTIC CASE STUDIES OF TROPICAL SQUALL LINES IN THE SOUDANIAN CLIMATE ZONE OF WEST AFRICA J. M. Schrage 1 and Andreas H. Fink2 1Dept. of Environmental and Atmospheric Sciences, Creighton University, Omaha, USA 2 University of Cologne, Cologne, Germany 1. INTRODUCTION Within the framework of the German IMPETUS (“An

TWO SYNOPTIC CASE STUDIES OF TROPICAL SQUALL LINES IN …

Spatiotemporal variability of the relation between African ...

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Abstract [1] This study investigates the spatiotemporal variability of the relationship between African Easterly Waves (AEWs) and the lifecycle and characteristics of Squall Lines (SLs) over West Africa for the two six-month periods May–October 1998 and 1999. In all, 81 AEWs have been tracked using analyses from the European Centre for Medium-Range Weather Forecasts (ECMWF) and 344 SLs …

Spatiotemporal variability of the relation between African ...

African Easterly Waves and Atlantic Hurricanes

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African Easterly Waves and Atlantic Hurricanes Rosana Nieto Ferreira Tom Rickenbach. East Carolina University. Earle Williams ... Study the connections between Sahel Rainfall and Atlantic Hurricanes. 2006 GPCP 1dd Rainfall - Niamey ... subsistence agriculture in West Africa. MIT Radar - Niamey, Niger, West Africa . Squall line precursor to ...

African Easterly Waves and Atlantic Hurricanes

Squall: Nightmare for Designers of Deepwater West African ...

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squall on a typical FPSO spread moored in the Gulf of Guinea are analysed. Then a simplified squall model is built, in order to assess the sensitivity to some key parameters. The details of the procedure are detailed in the next sections. WIND MODELING For such location in West Africa, two sets of extreme

Squall: Nightmare for Designers of Deepwater West African ...

Information Paper Summary of Results of the MARIN Study to…

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The study made use of the "Shuttle" numeric modelling application specifically ... Wind 15 m/s from west Current 1.5 m/s from north Waves 3.5 m Hs ... The simulation used actual squall wind measurements both in terms of direction and

Information Paper Summary of Results of the MARIN Study to…

A Tropical Squall Line Observed during the COPT 81 ...

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Abstract This paper deals with the analysis of a tropical squall line, observed on 22 June 1981 during the COPT 81 (Convection Profonde Tropicale) experiment. The present Part I is restricted to the study of the kinematic structure of the system, which moved in a moderately unstable atmosphere, faster than the environmental air at all levels.

A Tropical Squall Line Observed during the COPT 81 ...

A Regional Model Study of Synoptic Features over West Africa

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1564 MONTHLY WEATHER REVIEW VOLUME 129 q 2001 American Meteorological Society A Regional Model Study of Synoptic Features over West Africa LEONARD M. DRUYAN AND MATTHEW FULAKEZA Center for Climate Systems Research, Columbia University, NASA Goddard Institute for Space Studies, New York, New York

A Regional Model Study of Synoptic Features over West Africa

Polarimetric signatures and hydrometeor classification of ...

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methods used in this study. The large-scale environment and evolution of the three cases will be addressed in section 3. In section 4 the polarimetric signatures that characterize West African squall lines and the results of hydrometeor classification will be shown. In section 5 the kinematics of squall lines will be discussed and compared

Polarimetric signatures and hydrometeor classification of ...

(PDF) The two-dimensional dynamics of West African squall ...

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A study by Riehl et al. (1974) also found that on a scale of order 1000km, lateral convergence contributed 80% of the total below 5 km during four West African squall line cases. The absence of three-dimensional convergence and an induced anvil circulation in the two-dimensional model could account for the height difference between anvil ...

(PDF) The two-dimensional dynamics of West African squall ...

Spatiotemporal variability of the relation between African ...

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About Cookies, including instructions on how to turn off cookies if you wish to do so. By continuing to browse this site you agree to us using cookies as described in …

Spatiotemporal variability of the relation between African ...

Intense convective systems in West Africa and their ...

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We use TMI 85GHz data to study the convective systems of the wet season of 1998 and their relationship to the AEJ. The papers by Rowell and Milford (1993) and Hodges and Thorncroft (1997) on long-lived convective systems (squall lines) in West Africa discuss the important role of …

Intense convective systems in West Africa and their ...

Instability indices for severe weather forecasting in West ...

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Atmosphertc Research, 30 ( 1993 ) 51-68 51 Elsevier Science Pubhshers B V., Amsterdam Instability indices for severe weather forecasting in West Africa K. Oduro-Afriyiea and D.O. Adefolalub aDepartment of Phystcs, Untverslty of Ghana, Legon, Accra, Ghana bDepartment of Geography, Federal Umverstty of Technology, Mtnna.

Instability indices for severe weather forecasting in West ...

Agriculture in West Africa in the Twenty-First Century ...

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8/30/2016 · West Africa is known to be particularly vulnerable to climate change due to high climate variability, high reliance on rain-fed agriculture, and limited economic and institutional capacity to respond to climate variability and change. In this context, better knowledge of how climate will change in ...

Agriculture in West Africa in the Twenty-First Century ...

Polarimetric signatures and hydrometeor classification of ...

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3/11/2010 · During the AMMA campaign, the Doppler and polarimetric radar Ronsard was deployed in Kopargo, Benin. In the present paper, three squall lines sampled during that period are described. It was the first time this type of system had been observed with a polarimetric radar in the West African region.

Polarimetric signatures and hydrometeor classification of ...

Leading and Trailing Anvil Clouds of West African Squall Lines

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The anvil clouds of tropical squall-line systems over West Africa have been examined using cloud radar ... of this study, in which we separate the characteristics of the leading convective anvil and trailing stratiform an-vils of squall line systems, is to determine how the con-

Leading and Trailing Anvil Clouds of West African Squall Lines

F(P)SO Global Responses in the West of Africa Squall ...

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Mooring design for F(P)SOs in West of Africa offshore environment is in many cases governed by the squall driven condition. In the past, the squall condition was typically analyzed by using the peak wind speed with associated wind direction.

F(P)SO Global Responses in the West of Africa Squall ...

4.3 METEOROLOGICAL ORIGIN OF Q-BURSTS AND SPRITES OVER ...

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4.3 METEOROLOGICAL ORIGIN OF Q-BURSTS AND SPRITES OVER WEST AFRICA Earle Williams* ... The present study is concerned again with African lightning, but with mesoscale events—flashes with ... West Africa. 5. THE SQUALL LINE PERSPECTIVE More than 25 squall line cases have been

4.3 METEOROLOGICAL ORIGIN OF Q-BURSTS AND SPRITES OVER ...

Stratiform precipitation production over sub-Saharan ...

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Stratiform precipitation production over sub-Saharan Africa and the tropical East Atlantic as observed by TRMM By COURTNEY SCHUMACHER 1 and ROBERT A. HOUZE, JR. 2 1 Department of Atmospheric Sciences, Texas A&M University, USA 2 Department of Atmospheric Sciences, University of Washington, USA (Received 8 June 2005; revised 30 May 2006) S UMMARY

Stratiform precipitation production over sub-Saharan ...

Observational and Theoretical Study of Squall Line Evolution

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squall line observed on 23 June 1981 during the COPI' 81 (Convection Profonde Tropicale) experiment in tropical West Africa (Rowe, 1988) also featured the sloping zone of vorticity (Fig. 3). In this case, it appears to be the result of strong shear just below the upper FrR flow. An example of a system with

Observational and Theoretical Study of Squall Line Evolution

Climatology of Satellite-Derived Mesoscale Convective ...

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purpose of this study, the Squall Line Systems (SLSs) represented MCSs. Often, the two may be used interchangeably. From the climatological studies of SLS (referred to a “disturbance lines”, DLs) over the West Africa by Aspliden et al., (1976) using the three phases …

Climatology of Satellite-Derived Mesoscale Convective ...

Towards an operational method of estimating rainfall over ...

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Precipitation over West Africa (7)357 RESULTS For the study period, more than i00 cloud clusters have been tracked. Their lifetimes are very different, varying from a few hours to more than two days. Therefore significant results have been obtained only for 17 cloud clusters which …

Towards an operational method of estimating rainfall over ...

Geography of Nigeria - Wikipedia

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Nigeria is a country in West Africa. Nigeria shares land borders with the Republic of Benin in the west, Chad and Cameroon in the east, and Niger in the north. Its coast lies on the Gulf of Guinea in the south and it borders Lake Chad to the northeast. Noted geographical features in Nigeria include the Adamawa highlands, Mambilla Plateau, Jos Plateau, Obudu Plateau, the Niger River, River ...

Geography of Nigeria - Wikipedia

Mesoscale analyses of West African summer climate: focus ...

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climate over West Africa, models are challenged to produce realistic simulations, but high horizontal reso-lution is a definite asset. Diedhiou et al. (1999) investigated the properties of AWD based on NCEP and ECMWF daily reanalysis data gridded at 2.5 by 2.5 . Their study offers power spectra of 700 mb meridional wind (v7) time series for

Mesoscale analyses of West African summer climate: focus ...

An analysis of the environments of intense convective ...

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study, we analyze the local and regional-scale thermodynamical and dynamical environments associated with intense convective systems in West Africa during the 2003 wet season. The review paper of Houze (2004) summarizes the initial development of organized

An analysis of the environments of intense convective ...

Strong wind climatic zones in South Africa

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Strong wind climatic zones in South Africa A. C. Kruger1*, A. M. Goliger2, J. V. Retief3 and S. Sekele1 ... surface troughs to the west in the interior with strong ridging from the ... The aim of this study is the zoning of the area of interest, in this case South Africa, into ...

Strong wind climatic zones in South Africa

Wind engineering in Africa 09-08A

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Wind engineering in Africa Jacob A. Wisse1 and Kees Stigter2 1 Technical University Eindhoven, the Netherlands 2 Wageningen University, the Netherlands (since 1/3/’05 Agromet Vision, Bruchem) _____ Abstract The International Association for Wind Engineering (IAWE) has very few contacts in Africa, the second-largest continent.

Wind engineering in Africa 09-08A

SPECIFICATION OF GLOBAL WAVE CLIMATE: IS THIS THE FINAL ...

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SPECIFICATION OF GLOBAL WAVE CLIMATE: IS THIS THE FINAL ANSWER? V. J. Cardone 1, A.T. Cox and V.R. Swail2 1Oceanweather Inc. Cos Cob, CT 2Environment Canada Downsview, Ontario 1. INTRODUCTION By the beginning of the decade of the 1980s, the

SPECIFICATION OF GLOBAL WAVE CLIMATE: IS THIS THE FINAL ...

(PDF) ATLAS on a climatology of West African Mesoscale ...

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Version 1 ATLAS on a climatology of West African Mesoscale Convective Systems M. TOMASINI1, J-P. LAFORE1, C. PIRIOU1, R. ROCA2, K. RAMAGE2, H. LAURENT3, C. MOREL1, S. SENESI1 I Introduction West Africa is a vast zone where several types of Mesoscale Convective Systems (MCS) develop according to the latitude, surface conditions and the topography…

(PDF) ATLAS on a climatology of West African Mesoscale ...

Meteorology, and Atmospheric Physics - link.springer.com

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Meteorol. Atmos. Phys. 38, 153-163 (1988) Meteorology, and Atmospheric Physics 9 by Springer-Verlag 1988 Institut fiir Meteorologie und Klimatologie der Universit/it Hannover, Federal Republic of Germany 551.515.52(66) A Composite Study of Early Summer Squall …

Meteorology, and Atmospheric Physics - link.springer.com

A Stochastic Model for the Design of Mooring System ...

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with the presence of squall events. In some locations like West Africa, squall events are one of the most important, if not the primary, environmental factors (Legerstee et al., 2006) governing the design of Floating Production Storage and Offloading (FPSO) units. The purpose of the present study is therefore to contribute to fill this

A Stochastic Model for the Design of Mooring System ...

Convective systems in the 2006 West African monsoon: a ...

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CONVECTIVE SYSTEMS IN THE 2006 WEST AFRICAN MONSOON: A RADAR STUDY A Thesis Presented to The Faculty of the Department of Meteorology San Jose State University

Convective systems in the 2006 West African monsoon: a ...
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