We build a software tool which enables the user (airline or Air Traffic Service Provider (ATSP)) the ability to analyze the flight-level-by-flight-level permeability of airspaces constrained by weather-hazards (turbulence, icing, and convection). The Airspace Analyzer automatically determines the space-time boundaries where weather hazards constrain capacity. The solution approach is based on an algorithm using computational geometry techniques for estimating the directional permeability of an airspace given the direction of the dominant demand flow on an airspace and the safety requirements of aircraft passing through the airspace. Phase I will result in theory, software, and examples that demonstrate proof of concept, and Technology Readiness Level (TRL) 3. Phase II will produce a prototype that demonstrates benefit to the airline and ATSP customer at TRL 4.