***Highly amplified weather pattern across the United States***
***Very cold weather continues east of the Rocky Mountains***
***Winter storm developing across the south-central U.S.***
The overall weather pattern over the next couple of days will be featured
with a pronounced upper level trough over the eastern half of the country,
and a big upper level ridge for the western states. This will keep the
West Coast and into the Intermountain West warmer and drier than normal,
and the central and eastern parts of the U.S. much colder and unsettled.
The warmest temperatures are expected over the Desert Southwest, where
more 75+ degree weather is expected through Monday.
It's official, Boston has reached its snowiest month on record with 45.5 total inches. The old record was 43.3 in January 2005.
— NWS Boston (@NWSBoston) February 15, 2015
The biggest weather concern over the next 24 hours will be a rapidly
developing nor’easter near New England. This is expected to produce
blizzard conditions for eastern New England on Sunday and into Sunday
evening, with 6 to 12 inches of snow expected, with locally higher
amounts. There will also be widespread windy conditions extending from
there to the eastern Ohio Valley and most of the East Coast. Wind gusts
could exceed 60 mph over New England before quieter weather settles in for
the beginning of the week.
This same storm is bringing in a truly arctic airmass behind it, with some
of the coldest weather of the season from the Mid-Atlantic to New England
on Sunday. High temperatures are expected to be 20 to 35 degrees below
normal by February standards, with afternoon readings in the single digits
and teens widespread, and 20s extending well into Virginia and North
Carolina. Strong winds will combine with these frigid temperatures to
produce brutal subzero wind chills, and numerous wind chill warnings and
wind chill advisories are in effect. Sub-freezing high temperatures are
also expected for Monday over these same areas.
Across the south-central U.S., precipitation is forecast to develop across
the southern Plains to the Deep South late Sunday and into Monday, as
southerly low level winds begin to advect moisture from the Gulf of Mexico
over the arctic airmass in place at the surface. This combination of warm
and moist air aloft and subfreezing temperatures at the surface is
expected to produce a wintry mix of sleet and freezing rain from Oklahoma
eastward to northern Georgia. Farther to the north, accumulating snowfall
is likely from eastern Kansas to the southern Appalachians.