CBM Numerical Weather Prediction and Forecast Models

Question 1

What does the acronym GFS stand for in operational weather forecasting?

Accepted Answer

Global Forecast System

Answer

GFS stands for Global Forecast System, the primary global NWP model run by NOAA/NCEP four times daily.

Question 2

Which numerical weather prediction model is known for consistently high skill in medium-range forecasting and is operated by a European consortium?

Accepted Answer

ECMWF

Answer

The ECMWF (European Centre for Medium-Range Weather Forecasts) model is widely regarded as the world leader in medium-range forecast accuracy.

Question 3

The North American Mesoscale (NAM) model is best suited for which forecast time range?

Accepted Answer

0–84 hours

Answer

The NAM is a regional model designed for short- to medium-range forecasts up to 84 hours, with higher resolution over North America than global models.

Question 4

What is 'data assimilation' in the context of numerical weather prediction?

Accepted Answer

The process of combining observations with a prior model state to create an optimal initial analysis

Answer

Data assimilation merges real-world observations (radiosondes, satellite, surface stations) with the model's background field to produce the best possible initial conditions for a forecast run.

Question 5

In ensemble forecasting, what does a large spread among ensemble members generally indicate?

Accepted Answer

Low forecast confidence and greater atmospheric uncertainty

Answer

A large ensemble spread signals greater uncertainty in the forecast, meaning the atmosphere is in a less predictable state and meteorologists should communicate lower confidence.

CBM - Certified Broadcast Meteorologist Practice Test

CBM - Certified Broadcast Meteorologist Practice Test

CBM Numerical Weather Prediction and Forecast Models