US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
303 PM EDT Tue Apr 23 2019
 
Valid Friday April 26 2019 - Tuesday April 30 2019
 
Hazards:
- Heavy rain across portions of the Central Plains and the Middle Mississippi Valley, Tue, Apr 30.
- Heavy rain across portions of the Northeast, Sat, Apr 27.
- Flooding possible across portions of the Southern Rockies, 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 Great Basin, the Middle Mississippi Valley, the 
Northeast, the Upper Mississippi Valley, the Great Lakes, and the Ohio Valley.
- High winds across portions of the Aleutians, Mon, Apr 29.
 
Detailed Summary:

To start off the medium range period, the system currently impacting the Southern Plains will push 
eastward and bring rain to the southeast U.S. by Friday, but not enough to meet hazardous criteria. 
However, as the area of low pressure reaches the Northeast on Saturday, some strengthening is 
expected and could result in rain amounts to reach over an inch across northern Maine.

The next system forecast to move across the northwestern U.S. Thursday and Friday should reach the 
Northern Plains by Saturday. Latest models indicate the possibility of wintry precipitation over 
the upper Midwest on Saturday and into Great Lakes region by Sunday. The amount of moisture 
associated with this system does not appear to be high enough to warrant a heavy precipitation area 
for now. 

Meanwhile, another upper-level trough should move 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. As this system enters the Central Plains on Monday, it will follow along a stalled 
frontal boundary and have plentiful moisture streaming northward from the Gulf of Mexico. This 
could result in an area of heavy rain across portions of the Central Plains, stretching eastward 
into the Middle Mississippi Valley on Tuesday (Apr 30).

Over Alaska, the only hazardous weather is expected to occur over the western Aleutians. A strong 
low pressure system is forecast to track over the islands on or around Monday (Apr 29) and bring 
high winds.

Snell