Return to WMRS weather page


Description of forecast models and outputs

Full Glossary:

AVN: "Aviation" numerical weather prediction model generated at the National Centers for Environmental Prediction (NCEP). No longer called the Aviation Model (AVN) but rather GFS (Global Forecasting System).

ECMF: European Centre for Meteorology Forecast model

GFS: Global Forecasting System. Numerical Weather Prediction model run every 12 hours at the National Centers for Environmental Prediction (NCEP). The GFS is run four times per day and produces forecasts out to 384 hours (16 days).

GOES: Geostationary Operational Environmental Satellite

INSIDE SLIDER: A term used to describe a weather system that moves into California from the northwest, with the bulk of the system's energy moving inland toward the Sierra Nevada and the Great Basin. These systems usually bring cool, breezy weather to Northern and Central California, but since the associated winds don't pass over the ocean, an inside slider normally produces only light precipitation, if any. On some occasions after the slider passes out of our region, surface high pressure builds strongly into the Great Basin, causing an offshore weather pattern to develop over our area, sometimes with unseasonably warm temperatures and strong, dry winds from the east or northeast

JET STREAM: Strong winds concentrated within a narrow band in the atmosphere. The jet stream often "steers" surface features such as front and low pressure systems

MRF: "Medium Range Forecast" model generated at the National Centers for Environmental Prediction (NCEP). No longer called the MRF but rather GFS (Global Forecasting System)

NCEP: National Centers for Environmental Prediction. Central computer and communications facility of the National Weather Service; located in Washington, DC

NGM: Nested Grid Model generated every 12 hours by NCEP.

POPs: Probability of Precipitation. (see Precipitation Terminology)

QPF: Quantitative Precipitation Forecast

RUC: Rapid Update Cycle model generated every 3 hours

UKMET: United Kingdom forecast model