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Soggy firework boxes are stacked on top of each other after strong winds and heavy rains knocked over the tent at Big Fireworks on Thursday morning. Melanie Maxwell I AnnArbor.com

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• Soggy firework boxes are stacked on top of each other after strong winds and heavy rains knocked over the tent at Big Fireworks on Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_28_fullsize.jpg
• Big Fireworks employees Randy Williams and Alina Coon sort through ruined boxes of fireworks runied after strong winds and heavy rains knocked over the tent at Big Fireworks on Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_29_fullsize.jpg
• Big Fireworks employees Alina Coon and Randy Williams carry a soggy box containing a large assortment of fireworks runied after strong winds and heavy rains knocked over the tent at Big Fireworks on Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_30_fullsize.jpg
• A large tent is seen flipped over in the parking lot where it used to cover the Big Fireworks stand along N Maple. Strong winds and heavy rains knocked over the tent at Big Fireworks on Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_31_fullsize.jpg
• Ann Arbor resident Nate Wegryn, 17, shovels soggy fireworks into a bag held open by Carson Alexander-White, 18 and Oleg Lougheed, 19, as they work to clean up after storm damage at Jake's Fireworks on Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_32_fullsize.jpg
• Jake's Fireworks employees bag wet fireworks after strong winds and heavy rains ravaged their stand on Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_33_fullsize.jpg
• Jake's Fireworks employee Carson Alexander-White, 18, pulls on tangled fencing as he and others work to clean up the stand on Thursday morning. Alexander-White, who had spent the night at the stand working as security, was woken by the strong storm early Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_34_fullsize.jpg
• Oleg Lougheed, 19, and Nate Wegryn, 17, load a box of ruined fireworks into the back of a garbage truck as they work to clean up after storm damage at Jake's Fireworks on Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_35_fullsize.jpg
• The Jake's Fireworks tent is bowed after being lifted and moved by an early morning storm on Thursday morning. Melanie Maxwell I AnnArbor.com /calendar/photologue/photos/00 Fireworks/cache/070512_NEWS_Fireworks_MRM_36_fullsize.jpg

This story was updated at 2:15 p.m. today.

Though thunderstorms pummeled the Ann Arbor area early Thursday morning, hot, humid conditions are expected to linger through the end of the week.

The National Weather Service has cancelled a heat watch for the area, upgrading it to a heat warning that is now in effect through 9 p.m. Friday.

Over the July 4 holiday, the high was 100 degrees, tying the record originally set in 1911, said Dennis Kahlbaum, University of Michigan weather observer.

Temperatures are expected to reach a high of 99 degrees today, with high humidity pushing heat indices up into 105 to 110. Overnight, the temperature is expected to drop to a low near 74 degrees.

Friday’s high will be about 101 degrees, with a low of 71 degrees.

The combination “will add to the heat stress and create a dangerous situation,” according to a statement from the National Weather Service.

The conditions heighten the risk for heat-related illnesses like heat stroke, heat exhaustion and dehydration.

The NWS recommends the following extra precautions for working outside:

• Strenuous activities should be limited to the morning and evening
• Wear lightweight, loose fitting clothing when possible
• Drink plenty of water
• Take frequent breaks in shaded or air conditioned environments
• Call 911 if you suspect heat stroke

Huron Valley Ambulance transported 10 individuals to area hospitals due to heat-related illnesses Wednesday, including heat stroke and heat exhaustion, said Joyce Williams, spokeswoman for the HVA.

Over the last several days, emergency room staff at St. Joseph Mercy Ann Arbor have seen a number of patients with dizziness, weakness, nausea and vomiting related to the heat, said Lauren Jones, spokeswoman for the health system.

A mass of colder, dryer air is expected to move through Michigan over the weekend, pushing the hot, sultry air out, Kahlbaum said.

The air mass is currently in Minnesota and is moving slowly.

A chance of thunderstorms Friday night may break the heat wave, as Saturday’s forecast calls for a high of 88 degrees with a low of 67.

Temperatures have been 90 degrees or higher for the past seven days in a row, Kahlbaum said.

Historical record high temperatures for Ann Arbor:

• Thursday, July 5: 101 degrees in 1911
• Friday, July 6: 100 degrees in 1988
• Saturday, July 7: 100 degrees in 1988
• Sunday, July 8: 102 degrees in 1936

Amy Biolchini covers Washtenaw County, health and environmental issues for AnnArbor.com. Reach her at (734) 623-2552, amybiolchini@annarbor.com or on Twitter.