Dangerous heat will continue to build across an expansive portion of the U.S., with Excessive Heat Watches, Excessive Heat Warnings, and Heat Advisories currently extending from the Upper Midwest to the Southeast impacting nearly a third of the U.S. population.
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A dome of high pressure is expected to generate well above-normal to record-breaking temperatures across the region both today and tomorrow.
This heat, combined with high humidity, will likely produce heat indices well into the triple digits in many locations.
Although above-normal temperatures are forecast to continue, some moderation is expected for many locations on Thursday.
While some cooling is expected in the East, temperatures will once again begin to soar in the Southwest on Thursday where an Excessive Heat Watch has been issued for portions of interior Southern California and southern Arizona.
A strong cold front that has brought much colder temperatures to the Northwest and northern Rockies is expected to provide the focus for showers and thunderstorms as it continues to push south and east through the northern Plains into the upper Mississippi and mid Missouri valleys later today.
Some of these storms may become strong to severe, with large hail and damaging winds possible.
Strong to severe storms are also possible across portions of the Mid Atlantic.
Ongoing strong to severe storms over the Ohio Valley will continue to drop southeast, with storms potentially impacting the Mid Atlantic later this morning into the afternoon.
On Wednesday, the front moving across the Upper Midwest will once again become the focus for showers and thunderstorm development, with scattered severe thunderstorms expected.
The Storm Prediction Center is indicating an Enhanced Risk for severe thunderstorms from northeast Iowa and southeast Minnesota to Upper Michigan, where several tornadoes, large hail, and damaging winds all appear likely.
Cold, windy, and wet conditions will continue across the northern Rockies today.
A Winter Storm Warning remains in effect for parts of northwest Montana, including Glacier National Park, where elevations above 5000 ft are expected to see several inches of heavy, wet snow.
Dry conditions and gusty winds are expected to produce another day of elevated to critical fire weather conditions across portions of the Southwest into the central and southern High Plains.
Red Flag Warnings are in effect across portions of southwestern Colorado and northern New Mexico where conditions are expected to be favorable for the easy ignition and rapid spread of fires on Tuesday. ■
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