US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
313 PM EST Fri Jan 25 2019
 
Valid Monday January 28 2019 - Friday February 01 2019
 
Hazards:
Heavy precipitation (rain and mountain snows) across portions of California, Fri, Feb 1.
Heavy snow from the Great Lakes to the Northeast, Mon-Wed, Jan 28-Jan 30.
Flooding possible across portions of the Southeast, the Mid-Atlantic, and the Northeast.
Flooding occurring or imminent across portions of the Southeast, the Great Lakes, the Lower 
Mississippi Valley, the Southern Plains, and the Ohio Valley.
High winds across portions of the Central Plains and the Northern Plains, Mon, Jan 28.
Much below normal temperatures across portions of the Northern Plains, the Mississippi Valley, the 
Ohio Valley, the Southeast, and the Northeast, Tue-Thu, Jan 29-Jan 31.
Much below normal temperatures from the Upper Mississippi Valley to the Lower Great Lakes, Mon-Fri, 
Jan 28-Feb 1.
High significant wave heights for coastal portions of the Aleutians, Mon-Tue, Jan 28-Jan 29.
 
Detailed Summary:

The biggest hazard over the CONUS next week continues to be much below normal temperatures spanning 
much of the country east of the Rockies. Strong arctic high pressure is forecast to drop southward 
from Canada into the northern tier states early next week, expanding very cold temperatures across 
the Midwest, the Ohio Valley, into the Northeast, and southward to the Gulf Coast. The largest 
anomalies are expected to be across the Mid-western states where daily highs and lows could be 20 
to 30+ degrees below normal with low minimum and maximum temperature records possible. Near 
freezing low temperatures could reach as far south as the Gulf Coast and northern Florida, which 
may result in the first freeze or frost for some locations.

A clipper system from central Canada moves into the northern Plains late this weekend, advancing 
quickly eastward into early next week across the Midwest, the Great Lakes, and the Northeast. This 
is likely to spread a swath of potentially heavy snowfall (4+ inches) across the Great Lakes to 
northern New England in the medium range period. There remains some model spread on low position 
which may would impact exactly where the heaviest axis of snow sets up, and even a transition from 
rain to snow for some locations.

Elsewhere, the Western U.S. should be dominated by upper level ridging which will keep locations 
warm and dry through most of next week. Upper level troughing moving towards the West Coast around 
Friday next week may result in periods of heavy rain and mountains snows for parts of California. 
In Alaska, a large and deep surface low impacts the Aleutians resulting in a period of significant 
waves and gusty (though below hazards chart criteria) winds. A couple of systems moving through the 
Gulf may spread some modest precipitation along coastal southern Alaska, though model differences 
remain so a heavy precipitation area was not included on this issuance.

Santorelli