RENO, Nev. (AP) — An uncommon summer rain system moving across the Sierra into Nevada should provide some relief from drought, especially across a band of northern Nevada where extreme drought conditions are reported.

Light rain began in western Nevada Sunday night and should continue into Tuesday, the National Weather Service said Monday.

NWS meteorologist Alex Hoon says the Tahoe Basin should get up to an inch of rain, with about a quarter inch in Reno. It may not sound like much, but it comes at a time there's typically little if any rain.

Hoon said it's because a lack of high pressure allowed remnants of a tropical storm in Asia to drift farther south than usual. Typically, a ridge of high pressure would build and push the moisture north into Canada and Alaska, he said.

"This situation, we have storm door open — almost like somebody forgot to shut the storm door," Hoon told the Reno Gazette-Journal (http://tinyurl.com/m8o24qa ). "Everything is so happening to come together at the end of June, which makes it very unusual."

As of June 19, the U.S. Agriculture Department had declared all counties bordering the California-Nevada line natural drought disaster areas. Moderate to extreme drought persists in most all of Nevada and eastern California.

The most extreme situation in Nevada is in east-central Washoe, southern Humboldt, southwest Elko, northwest White Pine, northern Mineral, eastern Lyon, most of Eureka and all of Pershing, Lander and Churchill counties, the weather service said.