US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
329 PM EDT Tue Apr 2 2019
 
Valid Friday April 5 2019 - Tuesday April 9 2019
 
Hazards:
- Heavy precipitation across portions of California, the Central Great Basin, the Pacific 
Northwest, and the Northern Great Basin, Fri-Sun, Apr 5-Apr 7.
- Heavy rain across portions of California and the Pacific Northwest, Fri-Sat, Apr 5-Apr 6.
- Heavy rain across portions of the Lower Mississippi Valley and the Southern Plains, Sat, Apr 6.
- Heavy rain across portions of the Southeast, the Lower Mississippi Valley, the Southern Plains, 
and the Tennessee Valley, Sun, Apr 7.
- Heavy rain across portions of the Southeast, the Mid-Atlantic, and the Southern Appalachians, 
Mon-Tue, Apr 8-Apr 9.
- Heavy snow across portions of the Northern Rockies and the Northern Great Basin, Sat-Sun, Apr 
6-Apr 7.
- Heavy snow across portions of the Northeast, Fri-Sat, Apr 5-Apr 6.
- Flooding possible across portions of the Northern Plains.
- Flooding occurring or imminent across portions of the Central Plains, the Lower Mississippi 
Valley, the Northern Plains, the Tennessee Valley, the Middle Mississippi Valley, the Upper 
Mississippi Valley, the Great Lakes, and the Ohio Valley.
- Flooding likely across portions of the Upper Mississippi Valley and the Northern Plains.
- High significant wave heights for coastal portions of California and the Pacific Northwest, 
Sat-Sun, Apr 6-Apr 7.
- High winds across portions of mainland Alaska and the Aleutians, Sun-Mon, Apr 7-Apr 8.
 
Detailed Summary:

A round of heavy rain will be possible during the Saturday to Monday time period (Apr 6-8), 
affecting locations from Texas to the southern Appalachians with the potential for 1 to 2 inches of 
rainfall for some areas.  The weekend heavy rainfall will be focused along a stalled frontal 
boundary and ahead of another system entering the Southern Plains.

Across northern New England there is potential for heavy snow on Friday and Saturday (Apr 5-6).  
High pressure will usher in cold temperatures ahead of an approaching area of precipitation from 
the Ohio Valley. There is still uncertainty related to the amount of precipitation available, but 
nonetheless the potential for a late season heavy snow event is there across the higher elevations. 
 If snowfall amounts greater than 4 inches were to occur, the greatest chance will be across the 
Adirondack Mountains of New York State, as well as the Green and White Mountains of New Hampshire, 
Vermont, and western Maine.

The Western U.S. will see an active period from Friday to Sunday (Apr 5-7).  A strong Pacific front 
will enter the Northwest on Saturday and bring the possibility of significant waves from northern 
California northward to coastal Washington.  Heavy rain is possible along the coast of the Pacific 
Northwest, as well as northern California.  Meanwhile, valley rain and higher elevation snow is 
expected from the Sierra Nevada to the Cascades.  Farther inland, heavy snow is likely across 
central Idaho, particularly across the Sawtooth Mountains.

The majority of Alaska will again remain fairly quiet during the medium range period.  The 
exception will be the central and western Aleutians where a developing low pressure system south of 
the region increases the potential for strong winds on Sunday and Monday, but significant 
uncertainty exists on placement of this low and its winds.  Elsewhere, any precipitation will be 
light and not enough to meet hazardous criteria across Alaska.  Rain and snow will be confined to 
the southern parts of the state, as well as the Aleutians. 

Hamrick