Table of Contents

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I. Introduction and Short Description of the Case

Introduction

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The situation over the Arctic Sea before the development

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II. Analysis for 29 January 1998 06.00 UTC - Early Wave Stage

06.00 UTC - Satellite Overview

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06.00 UTC - Frontal, Wave and Jet Streak diagnosis

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06.00 UTC - Cross sections

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III. Analysis for 29 January 1998 12.00 UTC - Developing Wave Stage

12.00 UTC - Satellite Overview

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12.00 UTC - Frontal and Wave diagnosis

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12.00 UTC - Cross sections

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IV. Analysis for 29 January 1998 18.00 UTC - 30 January 1998 06.00 UTC - Rapid Development

Rapid Development - Introduction

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Rapid Development - Satellite Overview

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Diagnosis of surface and Upper Level Lows

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Diagnosis of frontal parameters

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PVA and jet streak diagnosis

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Rapid Development - Cross sections

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Diagnosis of precipitation patterns with help of relative streams and NORDRAD radar

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V. Overview of Period 30 January 06.00 UTC - 18.00 UTC - Further Development of the Occlusion and ECMWF - HIRLAM Model Comparison

Further development of the Occlusion

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Additional invesstigation: Comparison of HIRLAM fields vs. ECMWF fields of isotachs and PVA at 300 hPa

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