ST. GEORGE — As far as weather, Labor Day weekend will have something for everyone starting with a lot of rain with less heat. And just in time for the Labor Day barbecues Monday, plenty of sunshine.
Stormy weather will move into Southern Utah Thursday night and last through Sunday evening. But this storm will be much different than the other monsoonal and tropical storms that have marked this summer.
It won’t be a case of it raining in Hurricane and dry in St. George, or flooded suburbs in Cedar City and nothing falling from the sky in Ivins.
Haden Mahan with the National Weather Service’s Salt Lake City office told St. George News that this weekend’s rain will be a shared experience.
He says while the typical summer monsoonal moisture from the south will be making a last summer showing, it will be combined with a fall-like trough coming from the west.
“The main difference is normally with our monsoonal setups most of the storms will be like daytime thunderstorms that billow up during the day and sort of die overnight and they tend to be more isolated,” Mahan said. “With this system, since we have the trough to our west, we’re going to have a lot more atmospheric lift. So the showers and storms are gonna be much more widespread.”
Mahan said the biggest impacts will be Friday and Saturday. According to the weather service, there is a 70-80% chance of rain Friday and Saturday throughout Southern Utah.
Unlike the last few storms, including a slight brush with Tropical Storm Hilary nearly two weeks ago, this stormy weather won’t necessarily be coming with a large number of watches and warnings, though Mahan didn’t discount the possibility of flash flooding – especially in areas prone to it.
“There are no watches in place but that could change, especially as we get closer to the event,” Mahan said. “There’s definitely the possibility for several flash flood warnings and even the potential for some severe thunderstorm warnings. But we’re not as concerned with the severe aspect.”
To underscore that point, just after 2 p.m.,Thursday, the National Weather Service issued a flash flood watch from midnight Thursday to Saturday evening for much of the five-county area.
But there is at least one place of possible concern: Zion National Park, which is expected to see one of the more crowded weekends of the year.
The weather service says the potential for flash flooding there is “probable” throughout the weekend.
“It’s pretty bad timing a storm like this for Labor Day weekend because it definitely could be pretty impactful,” Mahan said. “People shouldn’t necessarily be caught off guard because it will be a multi-day event of rain ongoing. It probably won’t be like your typical, ‘Oh, it’s really sunny,’ and then upstream it might be pouring rain.”
One thing that might be welcome locally is, at least for now, a goodbye to triple-digit temperatures. Highs will be in the 70s to 80s throughout Southern Utah, and Mahan said the storm’s humidity won’t necessarily be felt in the heat index.
And further north into Iron County, it’s going to be downright blustery, especially in the mornings.
“It’s going to start feeling like fall,” Mahan said. “In Cedar City, they may drop into the upper 40s on Monday morning, and then even St. George might be flirting with the upper 50s Monday and Tuesday morning.”
And while the outlook for the Labor Day weekend is stormy, Mahan said the last backyard get-togethers for summer on Monday likely will be saved as the clouds should clear out for Labor Day. Even better, the temperatures will remain in the 80s in the sun.
“There’s maybe a 5% chance of seeing something isolated on Monday. But for the most part, Monday is looking dry for Southern Utah,” Mahan said. “It should be pretty sunny on Monday but the temperatures will stay pretty cool.”
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