Ag Weather Forum              01/21 11:42

   Major Winter Storm for Southern US Friday Through Sunday With Possible Snow, 
Ice Concerns

   A major winter storm system is forecast to move through the southern half of 
the U.S. Friday through Sunday.

John Baranick
Staff Meteorologist

   A massive push of arctic air is going to set up a major winter storm system 
for the southern half of the country for Friday through the weekend, Jan. 
23-25. Widespread impacts including heavy snow and freezing rain, flooding, and 
extremely low temperatures are in the forecast through the weekend, with the 
cold hanging on into next week.

   This will all be set up by a cold front pushing south through the country on 
Thursday across the north and Friday across the south. The air behind the front 
is sourced straight from the North Pole and extremely cold. If the snow depth 
across Canada and the northern United States was deeper like it should be this 
time of year, it would be even colder. But this massive push of cold air will 
still result in temperatures that are 20-40 degrees Fahrenheit below normal.

   This is coming essentially at the coldest time of the year. The third week 
of January is statistically the coldest week for most of the U.S. east of the 
Rockies. This may be a couple of days late, but it is going to be a massive 
change for a lot of areas. High temperatures on Saturday are likely to stay 
below zero F in the eastern Dakotas, Minnesota and Wisconsin, with 10s F in the 
Texas Panhandle through the Ohio Valley. And that is for high temperatures. 
Lows will be more than 20 degrees below zero F in the Upper Midwest and single 
digits as far south as western Texas, the Lower Mississippi Valley, and the 
Mid-Atlantic, which will continue into early next week.

   This punch of cold air will be the precursor to a major winter storm. The 
storm is off the coast of California as of early Wednesday morning, but will 
come ashore on Thursday night and spread eastward for Friday and through the 
weekend. The storm will be deep enough to pull up a significant amount of 
moisture from the Gulf of America over the top of the cold air, resulting in a 
wide band of heavy, mixed precipitation.

   Across the Gulf Coast, temperatures are likely to be high enough for all 
rain, and some thunderstorms may occur. Just to the north, from central Texas 
to southern Oklahoma east through the Mid-South and Carolinas, the air above 
the surface will be warm enough for rain, but the surface will be below 
freezing, resulting in heavy freezing rain.

   Model amounts have potential for over 0.50 inch of ice, though ice 
accumulation is a tricky one to forecast. Some of the rain that falls won't 
necessarily stick to all surfaces immediately. Heavy freezing rain may not 
accumulate as much as models project and instead runoff. But the forecast 
amounts do not need to come true to have significant impacts at the surface. 
Heavy rain could cause some areas of flooding as well, including the areas that 
see freezing rain, as the ground will quickly freeze and the rain will run off 
better.

   The rain will eventually turn to a mix of sleet and then eventually snow 
working north to about the I-70 corridor from Kansas through Ohio. The 
deepening low-pressure center on Sunday should pull more snow farther north 
through the Northeast as well. Snowfall amounts may reach over a foot in a wide 
band from eastern New Mexico through the Texas Panhandle, Oklahoma, Tennessee 
and Virginia, with lower amounts farther north. Some areas from Richmond, 
Virginia, through Boston, Massachusetts, could see close to or over a foot of 
snow as well, resulting in major problems for the Northeast megalopolis.

   Mixing with freezing rain and sleet may cut into some of the extreme 
amounts, however, and models may be overdoing snowfall in some areas. But if 
the temperatures are low enough and the snowfall rates heavy enough, that could 
be overcome, resulting in more snow where ice is currently being forecast, and 
upping snow totals. Wide ranges of accumulations are therefore likely in the 
heaviest snow band.

   Winds are not forecast to be extremely strong with the system, but even 
moderate winds that coincide with heavy, wet snow and ice may cause significant 
issues for infrastructure including downed trees and powerlines. The cold air 
that follows will slow crews trying to restore power as well. Ice of any kind 
will make travel nearly impossible for days across the South as crews have 
limited resources to battle such a significant event. Some daytime melting and 
refreezing overnight will extend the issues well into next week.

   Models are mixed on how far north the band of snow will extend, with some 
models cutting it off abruptly near I-70 through the Midwest and I-90 through 
the Northeast. Others expand it farther north than that. Dry, arctic air is 
likely to cut off the snow quickly to the north, but where that exactly sets up 
is still uncertain. The models also have some uncertainty with the overall 
track of the system and how far south the cold air will get. Still, this is 
shaping up to be a major winter storm with multiple impacts for a wide area of 
the country. Most of the country will feel at least some of the event whether 
it be cold, snow, or freezing rain.

   To stay up to date with weather conditions and your local forecast for free 
from DTN, head over to 
https://www.dtnpf.com/agriculture/web/ag/weather/interactive-map.

   John Baranick can be reached at john.baranick@dtn.com




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