Heary Snow & Widespread COLD with J7409 Weather watch
Marginally severe thunderstorms with hail and strong gusty winds will be possible today into tonight across parts of the southern Plains.
A deep upper-level low over central Canada is bringing the coldest air
mass thus far this season down from western Canada into the northern
Rockies and into the northern Plains. This surge of arctic air is poised
to bring heavy snow for the Rockies together with widespread record cold
temperatures into much of the interior western U.S., even into the central
and southern Plains during the next few days. Temperatures are forecast to
be 25 to 45 degrees below average, with actual readings dipping below zero
at the coldest locations over the northern and central Rockies. In
addition to the arctic cold, up to a foot of heavy snow is expected to
fall today over the Colorado Rockies and out into the High Plains of
northeastern Colorado. The winds will also pick up as the heavy snow
falls, and they could be enhanced by local terrain as an expansive high
pressure system builds in from the north. Blowing snow along with wind
chills as low as 25 below zero could be experienced in these areas.
By Wednesday evening, much of the snow should be exiting the central
Rockies and moving into the central Plains. The snow should then reach
the upper Midwest Wednesday night where up to 6 inches could accumulate by
Thursday morning. This is in response to the development of a low
pressure system over the southern Plains as it moves rapid toward the
Mid-Mississippi Valley Wednesday evening and into the Appalachians
Wednesday night.
Meanwhile, above to well above normal temperatures are expected to persist
over the eastern U.S. As the aforementioned low pressure system rapidly
develops, scattered showers and thunderstorms are expected to spread into
the Ohio Valley on Wednesday. In the mean time, strong thunderstorms
appear likely ahead of a strong cold front as it moves across the mid and
lower Mississippi Valley.
Over California, continued dry and windy conditions will promote critical
to extreme fire weather threat for parts of northern and southern
California. An expansive high pressure system will build into the area
today. Winds are expected to pick up again today and will last into
Wednesday. This will increase the fire threat even into the interior
section of the Southwest.
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