…Widespread precipitation expected across the Northwest and northern
Rockies, including heavy mountain snow for parts of the region…
…A strong area of low pressure will bring periods of heavy rain, gusty
winds, and the potential for severe thunderstorms throughout the southern
to central Plains between tonight and Monday…
…Heavy rain and scattered instances of flash flooding possible early
this week across the central and eastern Gulf Coast…
An inland progressing cold front and associated onshore flow off the
Pacific Ocean will aid in producing widespread precipitation over the next
few days across the Northwest and northern Rockies. Moderate to locally
heavy rain is possible across coastal sections of Washington and Oregon,
while heavy snow is likely throughout the Cascades and high terrain of
northern Idaho and western Montana. Meanwhile, a much stronger storm
system and corresponding atmospheric river is anticipated to begin
impacting the Northwest Tuesday night. Strong winds and heavy rainfall are
possible from northern California to Washington, with potential impacts
including scattered flooding and power outages, as well as heavy mountain
snowfall.
A strong area of low pressure is also forecast to produce numerous weather
hazards across the central U.S. beginning tonight. The strengthening storm
system is expected to organize over West Texas and push into the central
Plains by Monday. On the east side of this storm a strong surge of
atmospheric moisture content from the western Gulf of Mexico will aid in
creating an environment ripe for thunderstorm development, particularly
across western/central Texas and southwest Oklahoma into early Monday.
This region is where the Storm Prediction Center currently highlights the
best potential for damaging wind gusts and a few tornadoes. A draped
stationary boundary extending from the central Plains into the low
pressure center will allow for a corridor of focused heavy rainfall and
the possibility of scattered flash flooding. Flood Watches are in effect
from northwest Texas to central Oklahoma in order to highlight this
concern. As the anomalously deep system moves northward on Tuesday,
rainfall chances will also spread northward into the Upper Midwest. Snow
is also likely to develop across parts of North Dakota and could be heavy
at time through Wednesday morning. Additionally, a tight pressure gradient
associated with this area of low pressure could create periods of strong
winds throughout the central U.S. early this week.
Heavy rainfall is also a concern throughout the central and eastern Gulf
Coast early this week as an approaching cold front interacts with a surge
of tropical moisture associated with Tropical Storm Sara as it dissipates
over Belize today. This elevated atmospheric moisture content is
anticipated to allow for areas of heavy rainfall between eastern Louisiana
and the Florida Panhandle, with high chances (70-90%) for widespread
rainfall amounts of at least 2 inches.
Temperatures anomalies are forecast to split the Nation in half over the
next few days as below normal temperatures dominate the West, while above
normal readings remain in the East. Dry conditions can be anticipated
along much of the East Coast, central High Plains, and Southwest through
Wednesday morning.
Snell
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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