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Random Weather Terminology Selections

1. Heating Degree Days
A form of degree-day used to estimate energy requirements for heating.

2. Stratus
A low, generally gray cloud layer with a fairly uniform base. Stratus may appear in the form of ragged patches, but otherwise does not exhibit individual cloud elements as do cumulus and stratocumulus clouds. Fog usually is a surface-based form of stratus.

3. cumulus cloud
A cloud in the shape of individual detached domes, with a flat base and a bulging upper portion resembling cauliflower. A cloud less vertically-developed than a cumulonimbus cloud.

4. European Center for Medium-Range Weather Forecasting (ECMWF )
Operational references in forecast discussions typically refer to the ECMWF's medium-range forecast model.

5. Storm-scale
Referring to weather systems with sizes on the order of individual thunderstorms.