Abbreviations   * ICAO – International Civil Aviation Organization;   * KQ – Kenya Airways;   * TTF – Trend Type Forecasts;   * TAF – Terminal Aerodrome Forecast;   * AIR ACCIDENT – An occurrence during the operation of an aircraft, which entails:       + A fatality or serious injury;       + Substantial damage to the aircraft involving structural failure or requiring major repair of the aircraft; or       + The aircraft is missing.   * HARZADOUS WEATHER – Weather that exceeds the pilot/aircraft capabilities. Introduction Since the flight by Wright brothers early in 20th century, the aviation industry realized the close knit between weather and flying. Adverse weather has major impacts on safety, efficiency and capacity in aviation operations. Adverse weather includes low level wind shear, visibility, thunderstorms, icing turbulence in cloud and in clear air. The hazards reduce the safety margins and increase the occurrence of incidents which could result into accidents. Even with technological evolutions, weather-related aviation accidents, in both commercial (i.e., commuter, transport category) and General Aviation (GA) industries still remain one of the most significant causes for concern in aviation safety today. Weather strongly affects the entire air traffic control system. Accidents, flight delays, airport operations, and fuel economy are only a few of the more significant factors in air transportation that are affected directly by weather phenomena. Problem Statement Daily and globally, there are many aviation operations affected by weather including incidents and accidents Kenya has its own share of aviation accidents. Severally, accident investigation reports indicate weather to be a contributor to aircraft accidents. However, very few studies if any exist in Kenya which address the problems related to aircraft hazards, incidents and accidents related to adverse weather. Problem- What users say   * Develop and test an accurate and efficient aviation forecast system;   * Avail precise and accurate weather observations/ forecasts for flight planning;   * Provide more detailed en-route weather to General Aviation flight operators and create a mechanism for improved services delivery/ Justification Studies to improve the availability of strategic and tactical aviation weather information and its presentation to pilots can enhance weather situation awareness and enable avoidance or preparedness of adverse weather conditions. The vulnerability of aircraft to weather related disasters in Kenya has not been dramatically highlighted mainly due to lack of related relevant studies by local research Institutions or weather/climate centers. Objectives Of The Research Overall – Quantify the significance of adverse weather in aviation operations and economics at JKIA. SPECIFIC:   * Identify aviation weather hazards that affect operations at JKIA.   * Evaluate the aviation meteorological products acceptability and usability.   * Review present forecasting techniques at JKIA in comparison to other global centres.   * Examine the accuracy of the aviation forecasts at JKIA. Area Of Study There are several airports in Kenya. Three of them have international classification while others are either military or in General Aviation category. T