Severe Weather in the Plains; Heavy Rainfall in the Northern Plains, Tennessee Valley and Southeast

Numerous severe thunderstorms with a potential for 60-80 mph winds, along with tornadoes (some strong), and large to very large hail are expected across the northern and central Plains through tonight. Heavy to excessive rainfall may bring a flooding threat to parts of North Dakota and Minnesota, and from the Ohio Valley to the Southeast through tonight. 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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Severe Weather in the Plains; Heavy Rainfall in the Northern Plains, Tennessee Valley and Southeast

Lightning Potential Index Tutorial