By bob mims

| The Salt Lake Tribune

Isolated thunderstorms and showers were on Utah’s weather agenda for Saturday, keeping the potential high for renewed flooding from swollen rivers and streams.

The National Weather Service reported that southwestern Utah and the state’s southern mountains experienced fast-moving, scattered and occasionally severe moisture-laden thunderstorms Friday morning. Numerous lightning strikes were reported, accompanied by gusty winds.

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Concerned about the possibility of significant rainfall, forecasters issued fresh flood warnings for Salt Lake County’s Little Cottonwood Creek, northern Utah’s Logan River and Spring Creek, and the southern slopes of eastern Utah’s Uinta Mountains. A flood advisory for the Green River near the northeastern town of Jensen also was broadcast.

Little Cottonwood Creek was expected to rise near flood flow again by early Saturday morning as precipitation from the storm system was factored in.

In eastern Utah, the Upper Still Water Reservoir was full and spilling excess water into the Duchesne River, increasing the risk of flooding near the town of Duchesne. Rock Creek near Mountain Home also was above flood stage Friday, as was the Lower Duchesne River near Myton.

In central Cache County,the Logan River began Friday slopping near its flood levels and was expected to remain there into early Saturday. Near the town of Providence, Spring Creek continued to cause minor flooding.

Friday afternoon, the NWS also put the Bonanza area of northeastern Uintah County under a flash flood watch after storms dumped up to 2 inches of rain along the Utah-Colorado border.

High temperatures for Saturday were expected to repeat Friday’s forecast for readings in the upper-80s for northern Utah; low-80s in the eastern reaches of the state; mid-80s through most of southern Utah; and near-100 degrees at St. George, in Utah’s extreme southwest corner.

remims@sltrib.com