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PORTLAND -- The National Weather Service is warning of critical wildfire conditions in Oregon and southwest Washington.

The agency issued ared flag warning and heat advisorythrough Tuesday after hot weather increased the risk of thunderstorms. Forecasters say there could be several rounds of thunderstorms Monday night.

Crews are already fighting dozens of fires in the Northwest. The weather service says that given dry conditions on the ground there's a high potential for lightning strikes to generate several new fires.

A fire weather watch was also issued for parts of Washington state, with thunderstorms expected to develop along the crest of the Cascade Mountains and then spread north and west.

The Portland should see temperatures in the 90s and lower 100s, according to KGW meteorologist Nick Allard.

See Nick's forecast

We have a fair amount of cloud cover this morning and we should see more of the same this afternoon, he said. Look for partly sunny skies with an increasing chance for thunderstorms late in the day.

Temperatures will drop into the 80s and lower 90s Tuesday, he said, but look for a continuing chance of thunderstorms, especially late in the day.

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