…A significant winter storm crossing the Mid-South today will transition
to a strong nor’easter for the Mid-Atlantic and New England by Tuesday…
…Areas of severe thunderstorms, heavy rainfall, and flash flooding will
be possible across portions of the Southeast today…
…New storm system to arrive across the Northwest by the middle of the
week with areas of locally heavy rain and mountain snowfall…
A significant winter storm associated with a strong upper-level trough and
associated closed low will cross through the Mid-South today, and the Ohio
Valley tonight, which will continue to interact with enough cold air to
produce some areas of locally heavy snowfall across portions of the Ozarks
and gradually the Ohio Valley to the north of the low track. Locally
several inches of accumulation are expected, with portions of the Ozarks
expected to see in excess of 6 inches of snow.
Farther south and east across the Southeast, and on the warm side of the
strengthening area of low pressure crossing the Mid-South, the northward
advance of moisture and instability from the Gulf of Mexico and its
interaction with a strong frontal zone will produce numerous areas of
heavy showers and thunderstorms. Some additional severe weather is
possible today, with concerns for locally strong damaging winds, isolated
instances of large hail, and a few tornadoes. The Storm Prediction Center
has depicted a Slight Risk of severe weather (level 2 of 5) from central
and southern Alabama eastward across central and southern Georgia, the
Florida Panhandle, and into southern South Carolina to address this threat.
In addition to the severe weather threat over the Southeast, heavy
rainfall is expected, and there may be enough rain to produce isolated to
widely scattered instances of flash flooding. The Weather Prediction
Center has depicted a Slight Risk of excessive rainfall (level 2 of 4)
across portions of the Southeast to address this concern.
This storm system will be arriving across the Mid-Atlantic states tonight
and be transitioning to a strong nor’easter Tuesday morning as low
pressure exits off the Mid-Atlantic coast near the Delmarva and ejects
well offshore of southern New England by Tuesday night. The concern will
refocus back to winter weather impacts as moisture surging northward ahead
of the low center encounters sufficient levels of cold air for a swath of
heavy accumulating snowfall. The primary corridor of heavy snow is
expected to set up across central and eastern Pennsylvania through
northern New Jersey, southeast New York, and much of southern New England.
Many of these areas will see 6 to 12 inches of snow, with some areas
especially over the higher elevations near the Poconos, Catskills, and
adjacent areas of southern New England seeing in excess of 12 inches. The
nor’easter will bring strong winds to the region on Tuesday which coupled
with the heavy snowfall could damage trees and power lines. The strong
winds will also bring a threat for coastal flooding.
A new storm system meanwhile will arrive across the Northwest by the
middle of the week which will bring areas of heavy rainfall to the coastal
ranges of the Pacific Northwest, and heavy snowfall for the higher
elevations of the Cascades. This snowfall threat will also extend eastward
into the northern Rockies as Pacific moisture streams inland.