…Periods of excessive rainfall are forecast to slowly shift east from
southern Texas today, into the upper Texas coast on Friday, and into
Louisiana Friday night and Saturday morning…
…Snow and ice expected to develop over the northern Plains close to the
Canadian border on Friday and then expand toward the upper Great Lakes
Friday night…
…Windy and wet weather continues for the Pacific Northwest as
thunderstorms could become severe across portions of the central Plains
and southern Texas today…
A strong ridge of high pressure over the western U.S. will begin to shift
eastward into the mid-section of the country through the next couple of
days, bringing anomalous warmth into the central Plains where record high
temperatures well into the 70s to near 90 degrees are forecast at the
hottest locations by this afternoon. The dry and warm weather will also
promote fire danger across portions of the central Plains and High Plains.
Meanwhile, the persistent upper trough over the eastern U.S. is keeping
the Northeast cool with passing snow showers for the interior sections.
In between the warm ridge in the West and cold trough in the East, a heavy
rain event is in progress across southern Texas as vigorous lifting
mechanism associated with a subtropical jet stream crosses Mexico and
interacts with returning moisture from the Gulf into southern Texas. The
heaviest rainfall is forecast to shift relatively slowly up the Texas
coast later today into Friday, and then heading up into Louisiana coast
Friday night and Saturday morning. Bouts of heavy rain along with the
possibility of severe thunderstorms are expected to impact these areas,
where rainfall totals of 5 inches with locally higher amounts through the
next couple of days.
Across the Pacific Northwest, rain and embedded strong thunderstorms ahead
of a large Pacific cyclone have already been impacting western Washington
into western Oregon early this morning. Periods of moderate to heavy rain
together with windy conditions will persist for these areas as well as
down into northern California for the next couple of days. As colder air
slowly filters in, the higher elevations of the Cascades and Sierra Nevada
will begin to see wet snow. Periods of mixed rain and snow will also
spread across Idaho and into the northern Rockies.
Across the northern Plains, a round of wintry weather is expected on
Friday as a polar airmass pushes south from Canada against the strong warm
ridge moving into the Plains. An elongated low pressure system will form
along the front and track east across the northern Plains on Friday,
reaching into the upper Great Lakes by Saturday morning. Snow and ice are
expected to develop over the northern Plains close to the Canadian border
on Friday and then expand toward the upper Great Lakes Friday night. By
Saturday morning, another low pressure system is forecast to develop over
the central High Plains with mixed rain and snow expanding from the
central Rockies into the northern High Plains.
In the meantime, thunderstorms could become severe across portions of the
central Plains and southern Texas today ahead of a lifting warm front.
The combination of the warm upper ridge and an broadening southwesterly
flow will eventually bring a spell of very warm weather eastward across
the Midwest and Ohio Valley on Friday, reaching into the East Coast by
Saturday.
Kong
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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