PredictWind Help Center

How To Use Cape Maps

  • Click on Cape Maps from the left menu bar.
  • By clicking on the forecast resolution you can view the maps at 50 kilometer for the GFS and ECMWF, The 8 kilometer is only available on the ECMWF model.
  • The higher the resolution, the more accuracy and detail of the forecast.
  •  All maps can be zoomed and panned to zoom in and out use the plus and minus zoom controls on the map, your mouse wheel, or the trackpad in your laptop. You can also click on the map to get  detailed forecast information for that point on the map in the pop up box. When the CAPE index is zero, the air will be stable and convection is not possible.
  • For CAPE values up to about 1000, the probability of heavy showers increases. The Higher the value the more unstable the air is. Highly unstable atmosphere, CAPE values are usually in excess of 2500 joules per kilogram which would supply ample energy for strong updrafts and violent thunderstorms should they develop. The Cape maps can also be used in conjunction with the rain maps, if  a frontal band has a noticeable cape value it may be a more severe event.

The values can be interpreted in the following groupings.

0 to 1000

Marginally Unstable

1000 to 2500

Moderately Unstable

2500 to 3500

Very Unstable

3500 +

Extremely Unstable

 

For more information contact support@predictwind.com

Comments