Active Weather for the West, Warming in the East

The potential for heavy snow at higher elevations in the western U.S. will continue for many spots through the weekend. In the meantime, the eastern half of the continental U.S. will transition to above normal temperatures ahead of a pair of cold fronts next week that will bring readings back to closer to normal as we approach Thanksgiving Day. Read More >

Lightning Potential Index Header Image

Using the weather.gov/gjt website, you can obtain forecast lightning information year-round. The Lightning Potential Index (LPI) provides graphical guidance for the potential of lightning over a 60 hour period. This looping product will update continuously on a 3 hourly basis as new computer model information becomes available. This information should be used for general planning purposes only and is provided for the National Weather Service Grand Junction area of responsibility (eastern Utah and western Colorado). You are urged to seek out the latest forecast information by visiting WFO Grand Junction. Please see our Lightning Safety Page for more information.

To access the LPI:

First, click on the ‘Forecasts’ section of our website (red arrow below). A drop-down menu will then appear. Click on the 7^th entry from the top (or 2^nd one from the bottom) called ‘Lightning Potential Index (red oval).

From there, you will see the following webpage:

From this page, you can loop the current forecast, stop the loop, and step through each image in the loop.

And at the bottom of the page (or right above this text) you will find the Color Key and Explanation section of the page (or the legend). Think of the LPI as a stop light; Green means go, Yellow exercise caution and Red means stop (or take the day off from climbing that 14er).

If you have any questions on how to use the Lightning Potential Index, don’t hesitate calling us at 970-243-7007 or email us at wxgjt@noaa.gov.

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Active Weather for the West, Warming in the East

Lightning Potential Index Tutorial