Weather Services The following weather services and pre-flight planning information are available to pilots: Mean sea level analysis and prognosis charts Upper level analysis and prognosis charts; Satellite imagery; Grid point winds and temperatures; Route sector winds and temperatures; Significant weather charts; Domestic TAF, domestic ARFOR; Area QNH; International TAF bulletins; Selected route forecasts for […]
Recognising a Temperature Inversion
In the troposhere temperature tends to decrease as height increases. In the theoretical International Standard Atmosphere the temperature decrease or ‘lapse rate’ is defined as 1.98oC per 1000 feet gain in altitude. Like most things theoretical this doesn’t always happen in practice.
Pibals
Pibals are small helium filled balloons that balloon pilots use to help assess the winds aloft. By knowing the empty weight of the balloon and its inflated diameter you can use the table below to estimate a pibals ascent rate.
How to Calculate Air Density
This article describes the procedure to calculate air density given the temperature, dewpoint and pressure or temperature, pressure and relative humidity. Included on the page are online calculators.
