SAN DIEGO - San Diego residents are feeling the aftermath of Hurricane Dean in the form of muggy air, and seeing thunderheads to the northeast Sunday as well.

A blast of turgid, tropical moisture from the Gulf of Mexico has blown all the way to California, and where it meets updrafts from East County mountains, it's turning into pretty good thunderheads, a National Weather Service meteorologist said.

Steve Vanderburg said a thunderstorm watch for Southern California mountains and deserts as far north as Big Lear Lake will continue until 8 p.m. Sunday, and likely be repeated tomorrow.

"It's so humid out there Sunday, it is taking a lot longer to heat up the clouds," he said. "But they are out there gettign ready for some action this afternoon."

At midday, the Weather Service radar was showing Vanderburg a thunderstorm in the Riverside County mountains near Palm Springs and Idylwild, and another storm near Big Bear Lake.

"They are not moving much at all yet, but the flow is out of the east, and if the storms develop they will push off to the west or northwest," he said. "They could even drift over to the coast."

Tomorrow and Monday should see a slightly-drier trend, with airflow coming from the south.