This is an archived article that was published on sltrib.com in 2016, and information in the article may be outdated. It is provided only for personal research purposes and may not be reprinted.

High temperatures will drop and a new cycle of thunderstorms herald chillier dawns as northern Utah slips into the weekend.

As the poet Sylvia Plath once wrote, this is that "odd uneven time" of waning heat and late-August rain, with "the best of the summer gone, and the new fall not yet born."

Along the Wasatch Front on Thursday and Friday, the forecast called for highs in the low- to upper-80s. Pre-dawn temperatures, however, were to slide into the upper-50s to low-60s, mere weeks after northern Utahns were rising to mornings of 80 degrees and higher, along with triple-digit daytimes.

Beginning Friday afternoon storm clouds will gather, bringing thunderclaps and scattered rain showers to the region. Partly cloudy, sunnier conditions will resume Saturday.

The thunderstorms arrive earlier in southern Utah, where isolated showers and lightning were forecast Thursday through Saturday night. High temperatures over the next few days will be in the low-90s, while evening breezes will ease thermometers into the 60s at night.

The Utah Division of Air Quality notes "yellow," or compromised conditions in Salt Lake, Utah, Washington and Carbon counties heading into the weekend, but the remainder of the state earns "green," of healthy grades relating to particulate pollution levels.

The Intermountain Allergy & Asthma website reported that chenopods were "very high" and sagebrush, mold and grass "high" on its pollen index as of Thursday.

For more extensive forecast information, visit The Salt Lake Tribune's weather page at: http//www.sltrib.com/weather/.

Twitter: @remims