European Center for Medium Range Weather Forecasts
European Centre for Medium-Range Weather Forecasts
uropean enter for edium-Range eather orecasting
European Center for Medium-range Weather Forecasting.
European Centre for Medium-range Weather Forecast, based at Shinfield Park, Reading. As well as having a close working relationship, ECMWF was our neighbour at Shinfield Park (one of the locations short-listed for our new HQ site).
European Centre for Medium-Range Weather Forecasting. Operational references in forecast discussions typically refer to the ECMWF's medium-range forecast model. See MRF, UKMET. Elevated Convection - Convection occurring within an elevated layer, i.e., a layer in which the lowest portion is based above the earth's surface. Elevated convection often occurs when air near the ground is relatively cool and stable, e.g., during periods of isentropic lift, when an unstable layer of air is present aloft. In cases of elevated convection, stability indices based on near-surface measurements (such as the lifted index) typically will underestimate the amount of instability present. Severe weather is possible from elevated convection, but is less likely than it is with surface-based convection. nergy Helicity Index (or EHI) - An index that incorporates vertical shear and instability, designed for the purpose of forecasting supercell thunderstorms. It is related directly to storm-relative helicity in the lowest 2 km (SRH, in m2/s2) and CAPE (in j/kg) as follows