The Pacific Northwest is once again well on its way to seeing daytime highs soar into the upper 80s and low 90s today with more record breaking warmth expected.
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Tuesday and Wednesday will not feature as many days with record highs compared to over the weekend and Monday, but daily average temperature departures will still range between 15-25 degrees above normal through mid-week.
Record highs may be harder to come by, but numerous record warm minimum temperatures will be common throughout the Pacific Northwest.
Farther east, a complex and winding frontal boundary that extends from West Texas to the Southeast coast will be the focus for rounds of showers and severe thunderstorms through Wednesday.
The Weather Prediction Center (WPC) posted a pair of Slight Risks for Excessive Rainfall this afternoon; one in south Texas and another stretching from eastern Oklahoma to the Mississippi-Ohio River Confluence, where strong and occasionally slow moving thunderstorms could cause areas of flash flooding.
Some storms could also be severe, particularly from the Ozarks on east to the Tennessee Valley where the Storm Prediction Center (SPC) has a Marginal Risk (threat level 1/5) in place.
By Tuesday, low pressure organizing along the frontal boundary in the Tennessee Valley sets up a more active day of severe weather from the Cumberland Plateau to the southern Mid-Atlantic.
SPC has issued a Slight Risk (threat level 2/5) with severe storms capable of producing large hail, damaging winds, and tornadoes.
WPC also has a Slight Risk in place for portions of the Lower Ohio Valley and the southern Appalachians.
By Wednesday, The storm system will be tracking out to sea while its trailing cold front pushes across the Gulf Coast states.
WPC has issued an expansive Marginal Risk area from southern Louisiana to the Southeast coast as storms will be capable of producing some areas of flash flooding.
Elsewhere, a pesky upper low over the Northwest with highly anomalous moisture to work with aloft will prompt daily rounds of heavy showers and thunderstorms from the Pacific Northwest to the northern Rockies.
The primary concern is for downpours that cause localized flash flooding.
WPC has issued a pair of Marginal Risks for Excessive Rainfall; one in central Oregon and western Washington today, another from eastern Washington to western Montana on Tuesday, to highlight the potential flash flood threat.
In the Southwest, an approaching upper low over Baja California on Wednesday will cause an increase in shower/thunderstorm coverage.
WPC posted a Marginal Risk for Excessive Rainfall along the Mogollon Rim for Wednesday.
Lastly, a cold front racing south through the Northeast will deliver another shot of below normal temperatures Tuesday night and into Wednesday.
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. ■
Modified arctic air combined with a moisture-laden area of low pressure along the Gulf Coast will continue to allow for a broad area of winter weather impacts from the Lower Mississippi Valley to the Southeast today into early Saturday morning.