Numerous flood and flash flood warnings remain in effect for southern and eastern Utah as widespread moderate to heavy precipitation persists through Thursday evening, according to the National Weather Service Salt Lake City.
A marginal risk for severe thunderstorms exists for much of Utah through Thursday evening, with the potential for large hail and damaging winds.
Tropical moisture is fueling widespread showers and thunderstorms as an upstream low along the California coast moves through the Great Basin. Efficient rainfall rates are expected to continue, resulting in excessive runoff.
Most large drainages across south central into east central Utah are already running high and fast, leading to the active flood warnings. A flood watch is also in effect through Thursday evening for several areas including UTZ117, UTZ120, UTZ121, UTZ123, and UTZ131.
Snowfall is expected across the higher terrain of northern Utah from Thursday night into Friday morning. Forecasters expect 1-4 inches of accumulating snow likely above 9000 feet, with the possibility of locally higher amounts in favored locations.
Snow levels are expected to fall to roughly 8000 feet overnight. While shower chances are expected to decrease after approximately 09Z Friday, isolated shower redevelopment remains possible Friday afternoon.
As the initial low ejects into the northern Rockies, a secondary upper low is forecast to form over the Desert Southwest on Saturday, then slowly translate into the central and southern Rockies on Sunday. This pattern will maintain cool temperatures across the forecast area, with a chance of precipitation mainly across the eastern third of the coverage area.
An upper trough across the Pacific Northwest is expected to keep temperatures near to slightly below climatological norms for much of next week.
Aviation conditions for Salt Lake City include off and on showers through Thursday evening and the early portion of the overnight. There is a 10-30% chance of MVFR ceilings and visibility during periods of heavier precipitation, especially during thunderstorms.
For more information, visit http://weather.gov/saltlakecity
