How to Read a Weather Model

Today's weather forecast revolve around computer generated models. Reading the basic information these computers provide is pretty easy.

Difficulty: Moderately Easy

Instructions

1. Download NCEP Weather Model and Forecast site. On there you will see a number of options. We are focusing on the GFS and NAM.

2. The GFS is a long range model, going out to over 300 hours. The NAM is used in the shorter term going out 84 hours. On each one you will see O Z, 6Z, 12Z and 18Z. This is the time they run the model, each runs four times a day.

3. Scroll down the page and click on an hour. The best option is to click on fine and then the 850 MLB and 6 hr Precip. A map should then appear.

4. On that map there will be a number of graphics, but if you are searching for a storm look for green. The amount of precip is broken down by color. As you move from light green to blue to purple that represents light to heavy precip.

5. If you are seeking out a snow storm, you must look for the O line. It will be a blue line labeled 0. If any blue line is to your south and precip is showing up that will likely be something in the frozen state. The orange line is heat and means rain.

6. Scroll through the models and check out what the week will bring.

Tips & Warnings

• Models will change almost from run to run until just before the storm hits. Also, anything beyond 7-8 days has low probability of actually happening.