US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
331 PM EDT Thu Mar 21 2019
 
Valid Sunday March 24 2019 - Thursday March 28 2019
 
Hazards:
- Heavy precipitation across portions of California, the Central Great Basin, the Pacific 
Northwest, and the Southwest, Mon-Thu, Mar 25-Mar 28.
- Flooding possible across portions of the Northern/Central Plains, the Upper/Middle Mississippi 
Valley, and the Great Lakes.
- Flooding occurring or imminent across portions of the Northern/Central Plains, the Mississippi 
Valley, the Tennessee Valley, the Great Lakes, and the Ohio Valley.
- Flooding likely across portions of the Northern/Central Plains, the Upper/Middle Mississippi 
Valley, and the Great Lakes.
- Much above normal temperatures across portions of the Northern/Central Plains, and the 
Upper/Middle Mississippi Valley Wed-Thu, Mar 27-Mar 28.
- High winds across portions of mainland Alaska, Sun, Mar 24.
- High winds across portions of the Aleutians, Mon, Mar 25.
 
Detailed Summary:

Recent heavy rain and snow melt is contributing to flooding over parts of the Northern Plains into 
the Upper Mississippi Valley and the Upper Great Lakes through Tuesday. In addition, earlier snow 
melt and rain moving southward from the Upper Mississippi Valley into portions of the Middle and 
Lower Mississippi Valley producing flooding near the river and tributaries through Tuesday. Broad 
upper-level ridging and clockwise circulation around high pressure over Northeast into the 
Southeast will aid in producing temperatures much above normal on Wednesday into Friday over parts 
of the Upper Mississippi Valley into the Central Plains.  The higher than normal temperatures will 
aid in melting snow pack across parts of the Upper Mississippi Valley.  

In the meantime, upper-level low  just off the California Coast will slowly stream impulses of 
energy inland an associated plume of moisture will aid in producing heavy precipitation over parts 
of Northern/Central California on Monday into Thursday.  The precipitation will be higher elevation 
snow and lower elevation rain. 


In Alaska, deep low pressure over the Bering Strait/Sea on Sunday will aid in producing high wind 
over the West Coast of the Alaska mainland.  Deepening low pressure over the Aleutians will aid in 
producing high wind over parts of the Aleutians on Monday.

Ziegenfelder