US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
159 PM EDT Mon Apr 22 2019
 
Valid Thursday April 25 2019 - Monday April 29 2019
 
Hazards:
- Heavy rain across portions of the Southeast, the Lower Mississippi Valley, the Southern Plains, 
and the Tennessee Valley, Thu-Fri, Apr 25-Apr 26.
- Flooding possible across portions of the Great Lakes, the Northeast, the Southern Plains, and the 
Upper Mississippi Valley.
- Flooding occurring or imminent across portions of the Lower Mississippi Valley, the Northern 
Plains, the Tennessee Valley, the Northern Rockies, the Middle Mississippi Valley, the Northeast, 
the Northern Great Basin, the Upper Mississippi Valley, the Southeast, the Great Lakes, and the 
Ohio Valley.
- Flooding likely across portions of the Northeast and the Great Lakes.
 
Detailed Summary:

A low pressure system over the southern Plains should continue to spread showers and thunderstorms 
eastward into the central Gulf states by Thursday (Apr 25). This will support the threat of heavy 
rain over the region Thursday and Friday. Models are now in better agreement for the associated 
upper-level trough to gradually become an open wave and push the system faster toward the east. 
This will decrease the threat of heavy rain across the southeastern U.S. this weekend.

The next system forecast to move across the northwestern U.S. Thursday and Friday should reach the 
northern Plains on Saturday. The latest ECMWF indicates the possibility of wintry precipitation 
over the upper Midwest on Saturday while the GFS keeps the wintry weather near the Canadian border. 
The amount of precipitation associated with this system does not appear to be high enough to 
warrant either heavy snow or heavy rain areas.

Meanwhile, another upper-level trough should be moving across the northwestern U.S. this weekend. 
Some snow could accumulate in Montana on Sunday as a high pressure system from Canada could 
strengthen the upslope flow. But confidence is not high enough to specify a heavy snow area for 
this region at this time.

Over Alaska, despite significant model differences, no hazardous weather is expected to impact the 
state through the medium range period.

Kong