4th of July Forecast Has Three Serious Threats — Which One Is Heading Your Way?

The early look at the Fourth of July weather forecast is here, signaling a mixed bag of conditions across the U.S. Everything ranging from oppressive heat, thunderstorms, and wildfire smoke is on the table for the holiday. Here is a peek at the forecast as Americans look to celebrate the country's 250th birthday.

Potential Weather Hazards for the Fourth of July Weekend

There will be a little bit of everything in the forecast for the Fourth of July weekend. While some areas escape with little to no disruptions, other places will be kept on their toes due to the unpredictability of Mother Nature this time of the year.

According to the American Automobile Association (AAA), an estimated 72.2 million people are predicted to travel at least 50 miles away from home during the long weekend. The bulk of these travelers will be on the roads.

As is typical this time of the year, thunderstorms will present the greatest challenges to travelers and to those with outdoor plans. Thunderstorms tend to strike during the peak afternoon heating hours in early July. This means that just because your beach plans may be threatened by the thunderstorm activity, there is still a good chance that the inclement conditions will improve in time for the fireworks show.

Flight delays and ground stops could be a concern when storms roam near airports. Motorists may encounter periods of heavy rain capable of leading to ponding on roadways and poor visibility.

Forecasters are now warning that this heat wave could be historic as a heat dome builds over the eastern half of the country in the days leading up to the holiday. The National Weather Service says this could be the most widespread heat wave of the summer so far, with temperatures in the 90s to low 100s and heat index values approaching or exceeding 105 to 110 degrees in many areas. Warm overnight lows will limit relief, with some locations potentially setting records for warmest overnight minimums.

While the heat initially focused on the central U.S., the greatest departure from normal temperatures will be across the eastern third of the country as the three-day weekend approaches, peaking Thursday into Friday. The Mid-Atlantic and Northeast will also be under the gun for dangerous, potentially record-setting heat over the holiday.

There is also a good chance that several waves of thunderstorms ignite around the northern rim of the heat dome. Known in meteorological terms as the "ring of fire," it is not unusual for storms to fire up along the edge of these areas of high pressure.

The National Hurricane Center (NHC) is also monitoring the remnants of Tropical Storm Arthur, the season's first named storm, which made landfall near Galveston, Texas, earlier this month. Its remnants are expected to move offshore the East Coast and could see some subtropical or tropical redevelopment over the Western Atlantic. Regardless of development, heavy rainfall is possible across portions of the Southeast United States. Even if the feature does not evolve into a tropical storm, a long stretch of the coastline from the Southeast to the Gulf Coast could be dealing with heavy rain, high winds, and rough seas as beachgoers flock to the region.

What to Expect on July 4

The greatest concentration of storms on Friday and Saturday is forecast to set up over a zone from Colorado and New Mexico to the east to the Atlantic Seaboard and down into Florida. While it will not be a total washout during this time period, the frequent rain showers and stormy conditions could deliver plenty of headaches to those in the path.

Frequent lightning strikes could send people scurrying indoors for shelter at times. Remember that it is important to seek shelter at the first sound of thunder.

The best odds of a dry holiday will be in the western quarter of the country. However, the dry weather will come at a cost. The Great Basin and the Intermountain West are currently experiencing a dangerous and historically severe wildfire situation. Utah's Cottonwood Fire has grown to over 92,000 acres with zero containment, making it the largest active wildfire in the country, and three firefighters have died battling blazes along the Colorado-Utah border. Utah Governor Spencer Cox has issued a statewide ban on personal fireworks through July 5, citing unprecedented fire behavior. This risk extends right into the holiday weekend, raising the chance of air quality concerns as wildfire smoke circulates across the West and beyond.

Fireworks restrictions are already in effect or expected across a wide swath of the West and High Plains due to drought and fire danger. Utah has issued a statewide ban, while Oregon, Washington, Colorado, Idaho, New Mexico, and Nebraska all have regulations or guidance in place. Multiple cities across Colorado have canceled or postponed their fireworks displays. You will want to check these regulations before lighting off your own firecrackers.

The coolest temperatures of the holiday will predictably be along the Pacific coast, with below-normal temperatures expected across much of the West as the heat dome shifts eastward. Widespread highs in the 70s and the low 80s will be the norm in these regions.

For instance, highs will hover around the 80-degree mark on the Fourth of July in downtown Los Angeles. It will be about 10 degrees cooler to the north in San Francisco. Seattle will enjoy cooler-than-normal weather with highs in the 70s or below. Conversely, temperatures are forecast to eclipse the century mark in Las Vegas and Phoenix.

Heading back to the East Coast, New York City could see highs push into the upper 90s, potentially tying daily temperature records, with overnight lows threatening record warm minimums. It will be a dangerously hot and humid affair for the celebration on the National Mall, with heat index values forecast to reach 105 to 110 degrees or higher in Washington, D.C., where highs of 102 to 103 degrees Thursday and Friday could break daily records.

Some of the nation's largest cities will be dodging both extreme heat and storms on the holiday. Cities under heat alerts and storm risk include Atlanta, Orlando, Nashville, Dallas, Chicago, Indianapolis, Philadelphia, Baltimore, Boston, Minneapolis, and Denver.

We will provide a more precise forecast when the holiday approaches. However, this is a good guide for now as you make your special plans for the long weekend.

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