US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
222 PM EST Mon Dec 02 2019
 
Valid Thursday December 05 2019 - Monday December 09 2019
 
Hazards:
- Heavy precipitation across portions of northern and central California, Fri-Sat, Dec 6-Dec 7.
- Flooding occurring or imminent across portions of the Northern Plains.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Sat-Mon, Dec 
7-Dec 9.
- High winds across portions of the Alaska Panhandle and mainland Alaska, Sat-Sun, Dec 7-Dec 8.
 
Detailed Summary:

The main hazard during the medium range period (Thur Dec 5 - Mon Dec 9) will be across much of 
northern and central California where another system entering the west at the end of this week will 
bring a round of heavy rain and mountain snows. The most likely impacted areas should be the 
coastal range of northern California/southwest Oregon, the Shasta mountains, and into the Sierra 
Nevada, with heavy rain possible down the coast towards the San Francisco Bay area. After this it 
quiets down a bit during the period before amplified troughing moves across the Midwest towards the 
end of the period. Moisture streaming north ahead of a cold front may bring a period of heavy rains 
to portions of the Southeast to the Mid-Atlantic and New England next Monday, but there is enough 
uncertainty still on the best location for heavy rain to leave an area out of the hazard chart for 
today.

In Alaska, a strong low pressure system moving across the western Aleutians and into the Bering 
Sea, will drive a cold front eastward into the Gulf of Alaska where eventually a new low pressure 
system may form this weekend. Persistent southerly flow ahead of the front will result in a few 
days of heavy precipitation across the southern Alaskan coast and parts of the northern Panhandle, 
with one day totals of several inches possible. Heavy rain and strong winds can be expected along 
the coast, with heavy snow likely in the higher terrain. A period of strong winds may be possible 
as the low deepens near the Aleutians, though speeds appear to be below the relatively high 
criteria to include an area today.

Santorelli