A strengthening low pressure system entering southern Quebec this evening and a potent cold front pushing toward the East Coast will continue to lead to a threat of severe thunderstorms and flash flooding into early tonight.
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Damaging wind gusts will be the main concern, with large hail, isolated tornadoes, and localized flash flooding also possible.
SPC has highlighted an area between Upstate New York and the Northern Neck of Virginia as having the greatest chances for severe weather.
Additionally, flash flooding is most likely over northern New York and northern Vermont, where rainfall totals could exceed 1 inch in a short period of time.
Most storms should weaken and exit into the western Atlantic by tonight, with tranquil weather in store for much of the eastern U.S. on Tuesday.
Upper-level ridging over the southern tier will continue to allow for an early-season heatwave to grasp much of the southern Plains and Deep South through this week.
Highs on Tuesday are once again forecast to soar into the mid-to-upper 90s, with triple digits expected in the southern High Plains and central Texas.
By Wednesday, mid-90s will extend farther east into the Deep South and Southeast.
Daily high temperature records could be threatened in this region, highlighting the abnormally warm temperatures for mid-May.
Residents are advised to follow proper heat safety by staying hydrated and avoiding strenuous outdoor activities.
Along with the above average temperatures, Critical Fire Weather is anticipated for west/northwest Texas on Tuesday.
Low relative humidity, gusty winds, and the possibility of dry thunderstorms could lead to conditions conducive for new and/or old wildfires to spread uncontrollably.
Red Flag Warnings are also in effect.
Elsewhere, the next round of organized showers and thunderstorms will impact the central Plains and Mid-Mississippi Valley on Tuesday as a low pressure system forms along a stationary boundary.
A few storms could turn severe, as well as contain heavy rainfall rates, from roughly southern Nebraska to northern Missouri.
The unsettled weather is expected to extend into the Ohio Valley on Wednesday, with additional threats for scattered severe thunderstorms and flash flooding.
For the Pacific Northwest, a potent frontal system traversing the region on Wednesday should bring moderate precipitation amounts and below average temperatures.
Winter will make a return to parts of the northern Cascades as snowfall accumulations could exceed 6 inches across the highest elevations. ■
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.