National Park

The heat warning expires Monday night, but then there could be flash flooding in southern Utah

(National Weather Service) Flash floods are “likely” in most of Utah’s national parks on Tuesday.

A warning of excessive heat in much of Utah is due to expire at 9 p.m. Monday, but the danger remains in the forecast: possible flash flooding in southern Utah.

Record-breaking or near-record temperatures will continue on Monday, according to the National Weather Service. The predicted peak in Salt Lake City is 100, and it could reach 109 in St. George and Zion Canyon.

Monsoon moisture is forecast to spread northward from the southern Utah border, with showers and thunderstorms likely, particularly Tuesday and Wednesday. Some of these storms could produce heavy rainfall in southern Utah with an increasing threat of flash flooding.

Flash floods are “possible” in Bryce Canyon, Capitol Reef and Zion National Parks and Grand Staircase-Escalante National Monument on Monday. Tuesday flash floods are ‘possible’ in Arches National Park and ‘likely’ in some slot canyons, dry washes and small streams in Bryce Canyon, Canyonlands, Capitol Reef, Glen Canyon, Grand Staircase-Escalante, Natural Bridges, Grand Gulch, San Rafael Swell and Sion.

It won’t be exactly cool in northern Utah for the rest of the week, but there are no triple-digit temperatures in the forecast, with highs in the mid-90s and overnight lows in the mountains. upper 60s and 70s in Salt Lake. City. Scattered smoke from wildfires on the west coast continues through Tuesday morning, and there is a 20% chance of rain Tuesday afternoon and Tuesday evening.

There is a 20% chance of rain (in the St. George area Monday afternoon, increasing to 30% Monday night and Tuesday and 40% Tuesday night. There is a 30% chance Wednesday afternoon and 50% showers and thunderstorms likely before midnight on Wednesday evening.

After this 109-degree Monday, temperatures will moderate in southern Utah – but only a little. The St. George area can expect highs of 102-106 through the end of the week, with overnight lows from the upper 70s to the mid-80s.