Record temperatures in West; severe weather in South, mid-Atlantic; PGA Championship forecast

The heat will remain a factor in the western U.S. this week, and record-high minimum temperatures are possible throughout the Pacific Northwest.

Elsewhere, a storm system could bring the possibility of severe weather and flooding from portions of the Appalachians to the mid-Atlantic states on Tuesday, according to National Weather Service meteorologists.

And professional golf fans would probably be wise to pack a parka this week if you're heading out to the PGA Championship in upstate New York: High temperatures in the practice rounds may only get into the 50s.

Here's a look at Tuesday's forecast.

Rare May heat wave continues in Pacific Northwest

Rain and cloud cover helped cool things off on Monday, but meteorologists warned residents in the Pacific Northwest that the unseasonably warm temperatures they've endured the past several days could linger for a while longer.

Forecast highs on Tuesday and Wednesday should not approach the record-setting territory seen this past weekend, but they'll still be hotter than normal: Temperatures are expected to be 15-25 degrees above normal through the middle of the week, meteorologists said.

"Record highs may be harder to come by, but numerous record warm minimum temperatures will be common throughout the Pacific Northwest," according to forecasts.

Severe weather from South to mid-Atlantic

A line of storms prompted severe thunderstorm warnings and brought the threat of flooding to southern Missouri on Monday night.

By Tuesday, the system will set up with the potential for an active day of severe weather from the Appalachians to the mid-Atlantic.

The National Weather Service's Storm Prediction Center has issued an "enhanced" risk for severe storms that could produce tornadoes, damaging wind and large hail. That's Level 3 on the 1-5 scale of storm risk.

That severe weather threat could extend to the north, too, encompassing parts of the lower Ohio Valley and the southern Appalachians, forecasters said.

When the storm moves out to sea on Wednesday, cooler weather will quickly follow.

Cooler weather in Northeast; PGA Championship forecast

Temperatures in the Northeast, including parts of New York, Vermont, New Hampshire and Maine, are expected to be below normal on Tuesday, particularly Tuesday night into Wednesday morning, forecasters said, which sets up for a cool 48 hours.

"Temperatures will be 10-20 degrees below normal on Wednesday across the interior Northeast and morning lows on Thursday could dip close to freezing in some spots," the weather service said.

That includes Rochester, New York, which is hosting the PGA Championship tournament this week at Oak Hill Country Club's East Course, where rain showers are possible off and on throughout the week, including Tuesday evening.

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Here's the upcoming forecast for Rochester, New York, from the weather service.

• Tuesday: Mostly sunny, with a high near 76. Breezy, with a southwest wind 15 to 23 mph, with gusts as high as 37 mph.

• Tuesday Night: Showers likely, mainly before 8pm. Cloudy, then gradually becoming partly cloudy, with a low around 39. North wind 8 to 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

• Wednesday: Sunny, with a high near 52. North wind around 14 mph.

• Wednesday Night: Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. West wind 5 to 8 mph.

• Thursday: Patchy frost before 7am. Otherwise, sunny, with a high near 61.

US weather watches and warnings

National weather radar

This article originally appeared on USA TODAY: Severe weather today in South, mid-Atlantic; PGA Championship forecast