Critical Fire Weather Continues for Coastal Southern California; Sharp Temperatrue Swings in the East

Critical to extremely critical fire weather conditions will continue for southern California through Wednesday due to moderate to locally strong Santa Ana winds. Red Flag Warnings are in effect. A fresh Arctic blast will impact the eastern half of the U.S. through the middle of this week before milder temperatures briefly return by week's end. Heavy lake effect snow continues in the Great Lakes. 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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Critical Fire Weather Continues for Coastal Southern California; Sharp Temperatrue Swings in the East

Lightning Potential Index Tutorial