Weather Prediction Center

National Oceanic and Atmospheric Administration

US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
418 PM EDT Thu Mar 23 2023

Valid Sunday March 26 2023 - Thursday March 30 2023

Hazards:
- Heavy rain across portions of California and the Pacific Northwest, Mon-Tue, Mar 27-Mar 28.
- Heavy rain across portions of the Southeast and the Lower Mississippi Valley, Sun-Mon, Mar
26-Mar 27.
- Heavy snow across portions of California, the Pacific Northwest, and the Northern Great Basin,
Mon, Mar 27.
- Heavy snow across portions of California, Mon-Wed, Mar 27-Mar 29.
- Heavy snow across portions of the Northeast and parts of the Lower Great Lakes, Tue-Wed, Mar
28-Mar 29.
- Heavy snow across portions of the Northeast, Sun, Mar 26 and Wed, Mar29.
- Flooding possible across portions of the Great Lakes, the Middle Mississippi Valley, the Lower
Mississippi Valley, the Southern Plains, and the Ohio Valley.
- Flooding occurring or imminent across portions of the Lower Mississippi Valley.
- Heavy snow across portions of mainland Alaska, Sun, Mar 26.
- High winds across portions of mainland Alaska, Sun, Mar 26.

Detailed Summary:

. . . CONUS . . .

On Sunday, low pressure over the Gulf of Maine will move eastward over the Western Atlantic. The
storm will produce Heavy Snow over parts of Northern New England. In addition, the associated will
extend across the Southeast to the Central Gulf Coast from Sunday into Tuesday. A wave of low
pressure moving along the boundary will aid in producing an area of Heavy Rain from the parts of
the Lower Mississippi Valley to the Southeast on Sunday and Monday.

Meanwhile, on Sunday, low pressure along the West Coast of Canada will move southward to just off
the Pacific Northwest Coast by Monday. On Tuesday, the low will deepen and continue to move
southward along the West Coast. The circulation around the low will stream moisture into
California, producing an area of Heavy Snow over parts of the higher elevations of Northern
California and the Sierra Nevada Mountains from Monday through Wednesday. Additionally, an area of
Heavy Snow will develop over parts of the Cascades on Monday. Moreover, the system will also
produce an area of Heavy Rain along the lower elevations and coastal regions of Northern/Central
California on Monday and Tuesday.

Furthermore, as the wave of low pressure moves off the Southeast Coast on Tuesday, the low will
deepen and begin to roughly move parallel to the coast until Wednesday. The system will stream
moisture off the Atlantic over parts of the Northeast, creating an area of Heavy Snow over Eastern
New York State into Northern New England from Tuesday into Wednesday.

. . .Alaska. . .

On Sunday, deep low pressure over the Chukchi Sea and the associated pressure gradient will create
an area of High Winds that will develop over parts of the Southwest Mainland and the Far North.
Moreover, the system will also create an area of Heavy Snow over parts of the western Far North on
Sunday. In addition, upper-level ridging east of the Chukchi Sea will allow temperatures to rise
above freezing from parts of the Southwest Mainland in a northeastern strip to parts of the
Interior and Far North Mainland from Sunday into Tuesday. However, the length of time the
temperatures will be above freezing will be short, therefore no hazard for temperature. Finally, in
the wake of the system, high pressure will build over most of the state on Wednesday.


Ziegenfelder