本文利用民航局桃園國際機場1999-2006年暖季都卜勒氣象雷達回波資料，分析弱綜觀環境條件下台灣中北部176個午後對流個案，探討不同月份與季節之午後對流初生期與成熟期在不同地理位置與不同地形高度的發展特徵。結果發現，北台灣東西區夏季對流活躍度皆高於梅雨季，但梅雨季對流日之對流活躍度皆較夏季為大。西區各月與對流日午後對流，除5月呈滯留發展外，其他各月皆有從山區向西向地形較低地區移動及／或發展之勢，東區午後對流有由山坡向東向地形較低地區移動及／或發展之勢。此外，發現雪山山脈東西區之夏季對流活躍度亦皆較梅雨季為大，而西區對流活躍度與對流發展速率，不論梅雨季或夏季皆較東區為大。西區各月與對流日之對流活躍度最大均發生在山坡與山區，且呈滯留發展型態。中央山脈西區各月對流主要在緩坡與山區上形成，並呈滯留發展型態。

Doppler radar data at Taoyuan International Airport of CAA in the warm season of 1999-2006 were used to identify 176 cases of the afternoon convection over northern and central Taiwan under weak synoptic forcing. The monthly (or seasonal) convective activity and development rate as well as the convective activity and development rate on the convection day were investigatied for different geographical locations and different terrains. Results showed that the seasonal convective activity for both eastern and western parts of northern Taiwan was greater in the summer than in the Meiyu season. However, the convective activity on the convection day was greater in the Meiyu than in the summer season for both eastern and western parts. Convection on both individual month and convection day over western part mainly formed over mountainous area and moved westward and/or developed over lower terrain areas except in May. Convection over eastern part mainly formed over mountain slope and moved eastward and/or developed over lower terrain areas. In addition, results indicated that convective activity was greater in the summer than in the Meiyu season for both eastern and western parts of the Snow Mountain Range. Convective activity and development rate for both the Meiyu and the summer seasons were greater over the western than the eastern part. Convective activity on both individual month and convection day over western part was greater over mountain slope and mountainous area, and the convection tended to develop locally after the formation stage. Over the western part of the Central Mountain Range, convection for each month mainly formed over the mountain slope and mountainous area and then tended to develop locally after the formation stage.