The effects of the monsoonal weather were to be first felt in southern Utah Monday, but from there the system is to engulf the remainder of the state like an atmospheric python.
Cloud cover began building over Utah's Dixie Monday morning, and despite high temperatures forecast to reach 100 degrees, chances for precipitation were accelerating. Tuesday's forecast highlights morning showers, thunder and lightning on the horizon; by afternoon, forecasters warned, hail and heavy rain will accompany daytime highs in the mid-90s.
The Wasatch Front, meantime, looked for chances of precipitation to steadily increase, along with wind gusts, Tuesday morning through the afternoon and evening. Highs were forecast to hit the low-90s, a few degrees cooler than Monday's expectations for mid-90s under skies threatening occasional rain and thunderstorms.
The Utah Division of Air Quality rated Salt Lake, Davis, Weber, Box Elder, Utah and Tooele counties as "yellow," or compromised; the remainder of the state was tentatively graded as "green," or healthy into the midweek.
The Intermountain Allergy & Asthma website listed only mold and chenopods as "high" while all other allergens were graded "low" on the pollen index as of Monday.
Visit the Tribune's weather page at www.sltrib.com/weather for more extensive, localized forecast content.