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Wednesday was expected to be another bad fire day across parts of Utah.

All of northwestern Utah remained under a red flag warning Wednesday. The warning, which predicts critical fire danger, won't expired until 9 p.m. Thursday, the National Weather Service in Salt Lake City said.

The weather service said humidity was expected to drop to about 5 percent Wednesday afternoon and temperatures were expected to approach 100 degrees in many northern valley locations.

The warning encompasses a large chunk of the state including the cities of Salt Lake, Tooele, Provo, Delta, Nephi, Park City, Manti, Ogden and Logan.

Also, the weather service warned that poor visibility and air quality issues may develop due to wildfires.

However, the Utah Department of Environmental Quality said Wednesday's air quality was expected to be good.

Salt Lake City looked for a high of 95 on Wednesday and 98 on Thursday; Ogden, 93 and 97, respectively; Provo, 94 and 98; Logan, 92 and 96; Wendover, 94 and 96; Duchesne, 84 and 87; Cedar City, 88 and 89; St. George, 102 and 102; and Moab, 96 and 95.

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