Autoren Daniela Schmuki Christoph Schmutz Simon Rohling 208 Aeronautical Climatological Information Grenchen LSZG Arbeitsbericht Nummer: 208 Autoren Daniela Schmuki Christoph Schmutz Simon Rohling Aeronautical Climatological Information Grenchen LSZG © und Herausgeber: MeteoSchweiz, 2004 Bestelladresse: Bundesamt für Meteorologie und Klimatologie (MeteoSchweiz) MeteoSchweiz Telefon +41 1 256 91 11 Office fédéral de météorologie et de climatologie (MétéoSuisse) Krähbühlstrasse 58 Telefax +41 1 256 92 78 Ufficio federale di meteorologia e climatologia (MeteoSvizzera) Postfach 514 [email protected] Uffizi federal per meteorologia e climatologia (MeteoSvizra) CH-8044 Zürich www.meteoschweiz.ch Federal Office of Meteorology and Climatology (MeteoSwiss) Table of Contents Aeronautical Climatological Information Grenchen LSZG 1 Table of Contents Introduction ···································································································································································· 4 A Climatology 1. GEOGRAPHICAL SETTING 1.1. Overview Switzerland ··························································································································································· 5 1.2. Overview Region Grenchen ················································································································································ 5 2. METEOROLOGICAL PATTERNS 2.1. Westerly Flow 2.1.1. Synoptic Overview and Associated Weather ························································································································· 6 2.1.2. Season of Encounter······························································································································································ 6 2.1.3. Local Weather Phenomena···················································································································································· 6 2.1.4. Aviation Hazards·····································································································································································6 2.2. Northerly Flow 2.2.1. Synoptic Overview and Associated Weather ························································································································· 7 2.2.2. Season of Encounter······························································································································································ 7 2.2.3. Local Weather Phenomena···················································································································································· 7 2.2.4. Aviation Hazards·····································································································································································7 2.3. Easterly Flow 2.3.1. Synoptic Overview and Associated Weather ························································································································· 8 2.3.2. Season of Encounter······························································································································································ 8 2.3.3. Local Weather Phenomena···················································································································································· 8 2.3.4. Aviation Hazards·····································································································································································8 2.4. Southerly Flow 2.4.1. Synoptic Overview and Associated Weather ························································································································· 9 2.4.2. Season of Encounter······························································································································································ 9 2.4.3. Local Weather Phenomena···················································································································································· 9 2.4.4. Aviation Hazards·····································································································································································9 2.5. Flat Pressure Pattern 2.5.1. Synoptic Overview and Associated Weather ······················································································································· 10 2.5.2. Season of Encounter···························································································································································· 10 2.5.3. Local Weather Phenomena·················································································································································· 10 2.5.4. Aviation Hazards···································································································································································10 2.6. High Pressure Pattern 2.6.1. Synoptic Overview and Associated Weather ······················································································································· 11 2.6.2. Season of Encounter···························································································································································· 11 2.6.3. Local Weather Phenomena·················································································································································· 11 2.6.4. Aviation Hazards···································································································································································11 B Tables and Graphics 1. WIND 1.1. Wind Polygon 1.1.1. Wind Polygon 10 Years························································································································································· 12 1.1.2. Wind Polygon per Season····················································································································································· 13 1.1.3. Wind Polygon per Month······················································································································································· 14 1.1.4. Wind Polygon per Hour··························································································································································17 www.meteoswiss.ch Federal Office of Meteorology and Climatology Table of Contents Aeronautical Climatological Information Grenchen LSZG 2 1.2. Wind Speed and Direction 1.2.1. Wind Speed and Direction 10 Years······································································································································21 1.2.2. Wind Speed and Direction per Season··································································································································22 1.2.3. Wind Speed and Direction per Month···································································································································· 23 1.2.4. Wind Speed and Direction per Hour······································································································································ 26 1.3. Cumulative Wind Speed and Direction 1.3.1. Cumulative Wind Speed and Direction 10 Years···················································································································30 1.3.2. Cumulative Wind Speed and Direction per Season···············································································································31 1.3.3. Cumulative Wind Speed and Direction per Month················································································································· 32 1.4. Wind RWY 25 (07) 1.4.1. Wind RWY 25 (07) 10 Years················································································································································· 35 1.4.2. Wind RWY 25 (07) per Season············································································································································· 35 1.4.3. Wind RWY 25 (07) per Month················································································································································36 2. WIND GUSTS 2.1. Wind Gusts 2.1.1. Wind Gusts 10 Years····························································································································································· 38 2.1.2. Maximum Wind Gust in 10 Years·········································································································································· 38 2.1.3. Wind Gusts per Season························································································································································· 39 2.1.4. Wind Gusts per Month··························································································································································· 41 3. VISIBILITY AND CEILING 3.1. Visibility 3.1.1. Hourly Visibility 10 Years·············································································································································47