US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
259 PM EDT Fri Apr 03 2020
 
Valid Monday April 06 2020 - Friday April 10 2020
 
Hazards:
- Heavy rain across portions of California, Mon-Tue, Apr 6-Apr 7.
- Heavy snow across portions of the Central Great Basin, California, and the Southwest, Mon-Tue, 
Apr 6-Apr 7.
- Flooding possible across portions of the Upper/Middle Mississippi Valley, the Southern Plains, 
and the Northern Plains.
- Flooding occurring or imminent across portions of the Mississippi Valley, the Northern Plains, 
the Tennessee Valley, the Great Lakes, the Southern Plains, and the Ohio Valley.
- Flooding likely across portions of the Middle Mississippi Valley and the Upper Mississippi Valley.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Tue-Thu, Apr 
7-Apr 9.
- High winds across portions of the Alaska Panhandle and mainland Alaska, Tue-Wed, Apr 7-Apr 8.
 
Detailed Summary:

In Alaska, an area of deep low pressure over the North Pacific will move into the Gulf of Alaska on 
Tuesday into Wednesday. The tight pressure gradient associated with the low will produce wind 
strong enough to meet the requirements for High Winds over parts of the Eastern portion of the Gulf 
of Alaska on Tuesday into Wednesday. The same storm will be accompanied by a plume of moisture that 
will aid in producing Heavy Precipitation over most of the Alaska Panhandle on Tuesday into 
Wednesday.

A deep upper-level low over the West Coast on Monday will slowly move inland by Friday. A weak 
plume of moisture will come onshore with the storm. The moisture and low snow levels will aid in 
producing heavy snow over parts of Northern California into the Sierra Nevada mountains on Monday 
and slowly taper off by Tuesday. Heavy rain will also develop along the Southern California Coast 
on Monday into Tuesday.

Over Hawaii, a slowly moving surface front will approach the western islands on Monday with 
preceding deep moisture from the south. As the front slowly moves through, heavy rain is possible 
along and ahead of the boundary through next Wednesday.

Ziegenfelder