The stench that engulfed Salt Lake City late on Monday probably originated in the waters of the lake that gave the city its name.
The Great Salt Lake is notoriously pungent, especially during cycles when brine shrimp eggs hatch and the microscopic shells float on the waves or litter the shore. The stink also can rise when biological material in the lake is brought to the surface or washed up on shore.
Changes in weather contribute to the odors wafting toward Utah's capital.
"Usually when we have a strong cold front, it overturns the lake," said James Nelson, forecaster with the National Weather Service forecast office on North Temple.
That "tends to disturb the water," he added.
Such a cold front arrived around 8:45 p.m. Monday, bringing strong winds from the west, cooler weather — and the infamous lake odor.