US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
406 PM EDT Mon Mar 18 2019
 
Valid Thursday March 21 2019 - Monday March 25 2019
 
Hazards:
- Heavy rain across portions of the Southeast, the Lower Mississippi Valley, and the Tennessee 
Valley, Sun-Mon, Mar 24-Mar 25.
- Flooding possible across portions of the Central/Northern Plains, the Tennessee Valley, the 
Middle/Upper Mississippi Valley, and the Great Lakes.
- Flooding occurring or imminent across portions of the Northern/Central Plains, Mississippi 
Valley, the Tennessee Valley, the Great Lakes, and the Ohio Valley.
- Flooding likely across portions of the Upper/Middle Mississippi Valley, the Great Lakes, and the 
Northern Plains.
- Heavy precipitation across portions of mainland Alaska, Thu-Sat, Mar 21-Mar 23.
- Heavy precipitation across portions of the Alaska Panhandle, Sun-Mon, Mar 24-Mar 25.
- High winds across portions of mainland Alaska and the Aleutians, Thu-Fri, Mar 21-Mar 22.
- High significant wave heights for coastal portions of mainland Alaska, Fri, Mar 22.
 
Detailed Summary:

Upper-level energy over Southern California will move eastward to the Southern Plains by Monday.  
The associated front over the Southwest will, likewise, move eastward to the Southern Plains by 
Monday, too.  Moisture from the Western Gulf of Mexico will move northward over the Plains 
overnight Thursday into Friday with a strong plume of moisture moving over the Western Gulf Coast 
into the Lower Mississippi Valley overnight Saturday into Sunday.  Showers and thunderstorms will 
develop a long and a head of the front over the Lower Mississippi Valley into to parts of the 
Tennessee Valley and Southeast Sunday into Monday.  The thunderstorms will aid in developing an 
inch or more of heavy rain over parts of the region on Sunday into Monday.  Numerous locations 
along the Missouri and Mississippi Rivers, and their tributaries, are expected to
maintain major to record flooding through at least Saturday.      

In Alaska, deep low pressure over the North Pacific will move northward into the Gulf of Alaska on 
Friday into Saturday.  An associated plume of moisture will stream into coastal regions of the Gulf 
of Alaska and the Alaska Panhandle on Thursday into Friday night.  The storm and moisture will aid 
to produce an area of heavy precipitation over portions of the Alaska mainland from Kodiak Island 
to the Kenia Peninsula on Thursday into Saturday.  Another plume of moisture will move into the 
Alaska Panhandle overnight Saturday into Monday.  The moisture will aid in producing a region of 
heavy precipitation on Sunday into Monday.  The strong pressure gradient associated with the deep 
low over North Pacific/Gulf of Alaska will aid in producing high wind over parts of the Alaska 
Peninsula to the Kenai Peninsula on Thursday into Friday.  The long fetch over the North 
Pacific/Gulf of Alaska of the high wind will aid in producing an area of significant waves of 20 
feet or more from the Kenia Peninsula to Kodiak Island on Friday.       

Ziegenfelder