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Late-day showers possible ahead of dry, warm 4th of July weekend

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ROCKFORD (WREX) — The first Friday of July could bring an isolated shower or thunderstorm as temperatures bake into the lower 90s. Despite the rain chance to end the week, the weekend is likely to remain dry.

Slight precipitation chance:

A "ripple" is moving through northern Wisconsin early Friday morning. While this ripple doesn't show up very well on satellite, it's a feature which could bring an isolated shower or storm to the Stateline. If a storm manages to develop, it is likely to come through between 5 and 8 PM. Once the heating of the day is lost after sunset, storm coverage should begin to wane.

A few isolated to widely scattered showers or storms bubble up as heat builds Friday afternoon.

There is going to be plenty of heat for storms to feed on during the afternoon hours. Highs Friday afternoon are likely to crack the 90° mark in Rockford, with favored "cool" spots like Freeport climbing into the upper 80s. Whether the high temperature in your town is 89° or 91°, it'll be a good day to take a dip in the pool.

Remaining warm and mostly dry:

The holiday weekend is going to be a warm one, but could we come close to record heat for the 4th of July? Unless something dramatic happens Saturday afternoon, highs are going to fall well below the record. That record, which dates back only eight years, is 102°. Highs Saturday afternoon climb into the lower 90s, but dew points remain in check for this time of year. This should result in heat index values of between 92° and 95°. While this is certainly toasty, it isn't hot enough to warrant a heat advisory.

The hottest weather on record for July 4th occurred in 2012, when highs reached into the lower 100s.

Sunday features more of the same kind of weather, with highs in the lower 90s and abundant sunshine. A slight uptick in humidity could be noted, as southerly winds are forecast to bring in higher dew point air.

Ninety-degree days don't look to be going anywhere soon, as temperatures are likely to hit 90° through much of next week. Rain chances remain pretty isolated through the upcoming week. Specific details regarding timing should come into focus through the upcoming weekend with next weeks isolated to scattered storm chances.

Fireworks 101:

This year's 4th of July festivities are going to look much different compared to years past, but fireworks are fun to talk about. What causes the brilliant colors? How does weather enhance the loud booming noises fireworks produce?

Chemistry plays a huge role in producing the colors of fireworks. In fact, chemistry and physics both play equally large roles in a successful firework show.

A lot of chemistry goes into producing the brilliant colors in firework displays.

Weather plays a huge part in a firework show. When humidity is high, fireworks produce loud, thunderous booms. That same effect is heard when temperatures are cool, like during the winter months.

Humid conditions enhance the loud boom of fireworks, but it can also make for slightly obscured views. As water vapor floats in the atmosphere, it makes sense that it can make viewing conditions murky.

Justin Ballard

Justin Ballard joined 13 WREX as the weekday morning meteorologist. He’s a proud graduate of UNC-Charlotte and happy to call Rockford home.

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