An unusual weather pattern is emerging across the United States for the Fourth of July. A heat dome is expected to affect the West and Texas while scattered thunderstorms may impact holiday events from the Great Plains to the East Coast.

With millions preparing for outdoor activities like parades, concerts, and fireworks, the weather forecast is crucial. Meteorologists caution that severe heat and sudden storms could lead to cancellations or changes to plans for communities nationwide.

The core of the heat dome will cause West temperatures to reach the 90s and triple digits. This intense heat will expand across the country in the days before Independence Day.

The West will experience distinct challenges. California, Nevada, Utah, Idaho, Washington, Oregon, and parts of Arizona will face hot and dry conditions. This extreme heat coincides with the peak of the summer wildfire season, increasing the risk that fireworks could trigger fires in dry vegetation. In past years, local officials have often canceled fireworks displays or enacted bans to minimize fire hazards.

AccuWeather senior meteorologist Chad Merrill said, “Building drought and dry thunderstorms over the interior West will boost the risk of wildfires.” Smoke from large fires may affect areas downwind from the Rockies to the Plains and even the Midwest.

Warm and dry conditions are also expected in Montana, Wyoming, the Dakotas, western Minnesota, northwestern Iowa, northern Nebraska, southern Texas, and southwestern Louisiana.

Meanwhile, the Midwest and parts of the mid-Atlantic can expect more favorable weather. Forecasters predict “mainly dry” and comfortable conditions in Iowa, Missouri, Illinois, Indiana, Kentucky, Ohio, West Virginia, Pennsylvania, Virginia, North Carolina, and Tennessee.

Merrill noted to Newsweek, “The Ohio Valley and Northeast on the Fourth of July look promising for dry and mild conditions.” Less ideal weather is forecast further south and west, where thunderstorms are likely to disrupt outdoor events. The Upper Midwest might also experience spotty rain.

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Given the rapid shifts in summer weather systems, meteorologists advise travelers and event planners to monitor local updates closely. Public safety officials urge residents to check municipal regulations regarding fireworks.

For queries, contact Newsweek editors John Fitzpatrick and Anthony Murray.