…Atmospheric river to produce heavy rain/snow across much of the
Northwest…
…Severe Thunderstorm outbreak and Excessive Rainfall potential from the
Southern Plains to Southeast today…
…Mild and much above average temperatures will persist across most of
the country…
The revolving door of mid-latitude cyclones propagating through the
Pacific Northwest is likely to continue through the rest of the weekend. A
deep low pressure system carrying anomalous moisture will generate heavy
to potentially excessive rainfall over parts of the Pacific Northwest
Coast. Parts of northern California and southern Oregon are of particular
concern for flash flooding as most of the heavy rainfall is likely to
focus over those areas through tonight. Things begin to dry up across the
Northwest Coast on Sunday. Meanwhile, heavy snow is also likely over parts
of the Cascades and Northern/Central Rockies, where anywhere between 1-3
feet of snow may accumulate by Monday morning, when snow intensity will
begin to weaken considerably.
Another area of concern is the Lower Mississippi Valley and Southeast,
where a developing low pressure system is likely to generate a severe
thunderstorm outbreak today, as well as heavy rainfall through the rest of
the weekend. Today, according to the Storm Prediction Center, an outbreak
of severe storms with tornadoes, wind damage, and large hail is expected
from parts of the Southern Plains, into the Lower Mississippi Valley and
central Gulf Coast states. Several long track tornadoes are expected.
Thus, a Moderate Risk (level 4/5) of Severe Thunderstorms was hoisted.
Additionally, a Slight Risk (at least 15%) of Excessive Rainfall is in
effect for a similar area to the SPC Slight, but extending farther into
the Tennessee Valley. Heavy rainfall and scattered to severe thunderstorms
shift into the East Coast on Sunday.
Temperatures will remain well above average for much of the Lower 48 this
weekend. Widespread high minimum temperatures may be tied or broken across
much of the Ohio Valley and interior Northeast tonight followed by the
Mid-Atlantic/Northeast Coast Sunday night. Troughing and cooler conditions
are projected to return to the West early next week.
Kebede
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php