Weather Wednesday June 5 2024 Late showers and t-storms New York City excesive delays over the eastern third of the nation.

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Severe thunderstorms and heavy rain possible from the lower Mississippi
Valley across the south-central Plains and through the upper Midwest
through tonight...
...Growing Excessive Heat concerns over portions of California's central
valley region as well as the Desert Southwest with Heat Risk persisting
over southern Texas...
Over the next couple of days, a shift in the weather pattern will
gradually push the active weather that has been persisting over the
mid-section of the country toward the eastern U.S. This shift in the
weather pattern will also bring a heatwave into the western U.S. A low
pressure system currently advancing across the northern Plains has
prompted High Wind Warnings and Wind Advisories from the northern Rockies
into the northern Plains. This system will act as a catalyst for the
weather pattern change as the trailing front marches across the country
through the next couple of days. Showers and thunderstorms are expected
to be most active ahead of the cold front across the Midwest and farther
south where it meets a low pressure wave over Oklahoma, where the chance
of severe thunderstorms and flash flooding will be the highest through
tonight. By Wednesday, the system will push steadily eastward, ending
much of the active weather over the mid-section of the country while
bringing widespread showers and embedded thunderstorms across the Great
Lakes, Ohio and Tennessee Valleys, and down toward the lower Mississippi
Valley. The inclement weather will reach into much of the East Coast on
Thursday as a cold front continues its eastward progress. There appears
to be a greater chance for New England to see stronger thunderstorms later
on Thursday as a warm front lifting northward meets the eastward-advancing
cold front.
Much cooler, damp, and windy conditions will gradually spread from the
northern Plains eastward into the upper Midwest and the Great Lakes
through the next couple of days behind the cold front and a deep low
pressure system over southern Canada. On the opposite side of the
country, a heatwave is in store for the southwestern portion of the
country as a strong ridge of high pressure intensifies and takes control.
Areas of particular concern for the heat include the low elevation regions
of California's central valley, where high temperatures will likely climb
well up into the 100s at the hottest location while 110s will be common
over the interior desert region including Las Vegas, NV especially by
Thursday afternoon. There is a good chance for the temperature to top 112
degrees in Las Vegas on Thursday, which would become the city's earliest
observed 112 degrees on record. Widespread temperature records are also
expected to be tied or broken elsewhere across much of the aforementioned
areas. Excessive Heat Warnings and Watches extend from the central valley
down through southern California's deserts, southern Nevada and
southern/western Arizona. Heat Risk will peak over California's central
valley on Wednesday before expanding into the Desert Southwest later this
week. Little overnight relief will make for dangerous conditions for
those without effective cooling and/or adequate hydration. Meanwhile,
Heat Risk over southern Texas peaks today but is expected to persist for
the next few days.