Los Angeles International Airport was subject to a ground stop Monday afternoon due to possible thunderstorms, according to the Federal Aviation Administration and National Weather Service.

Departures from a number of airports in nearby states — including Phoenix, Denver and Salt Lake City — were grounded as a precaution between 3:25 p.m. and 4:45 p.m. Monday, an FAA site showed .

The probability of a time extension was listed as medium, or 30% to 60%.

The NWS forecasted a 30% probability of thunderstorms near Palmdale on Monday afternoon and a high of 98 degrees. The airports subject to grounding were those at a distance where flights would pass over the area during a possible thunderstorm.

The storms come amid a surge of monsoonal moisture and instability across the Western U.S.

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