US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
347 PM EDT Mon Oct 28 2019
 
Valid Thursday October 31 2019 - Monday November 04 2019
 
Hazards:
- Heavy rain across portions of the Northeast, the Central Appalachians, the Tennessee Valley, the 
Mid-Atlantic, the Southern Appalachians, the Southeast, the Great Lakes, and the Ohio Valley, Thu, 
Oct 31.
- Heavy snow across portions of the Middle Mississippi Valley, the Great Lakes, and the Upper 
Mississippi Valley, Thu, Oct 31.
- Flooding possible across portions of the Middle Mississippi Valley, the Great Lakes, and the 
Northern Plains.
- Flooding occurring or imminent across portions of the Middle Mississippi Valley, the Upper 
Mississippi Valley, and the Northern Plains.
- Flooding likely across portions of the Northern Plains.
- Much below normal temperatures across portions of the Central Plains, the Central Rockies, the 
Lower Mississippi Valley, the Central Great Basin, the Northern Plains, the Tennessee Valley, the 
Great Lakes, the Northern Rockies, the Southern Rockies, the Middle Mississippi Valley, the 
Northern Great Basin, the Upper Mississippi Valley, the Southeast, the Southern Plains, the Ohio 
Valley, and the Southwest, Thu-Fri, Oct 31-Nov 1.
- Enhanced wildfire risk across portions of the California, Thu, Oct 31.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Thu, Oct 31.
- Heavy precipitation across portions of the Alaska Panhandle, Fri, Nov 1.
- Much above normal temperatures across portions of mainland Alaska, Thu, Oct 31.
 
Detailed Summary:

Deep layered Gulf of Mexico and Atlantic moisture will feed across the Appalachians/eastern U.S. 
Halloween ahead of a cold front and ejecting central U.S. closed upper trough. This brings the 
threat for widespread moderate to heavy rainfall. A frontal low will significantly deepen over a 
stormy Great Lakes to drive lead heavy rains through the Northeast. Cooling temperatures and 
wrap-back moisture offers a risk of heavy snow from northern Illinois to Michigan Thursday with 
some lake effect snows lingering into the weekend. Post-frontal cold air dug far southward through 
the Rockies, Plains and Mississippi Valley offers much below normal temperatures for the broad 
region Thursday into Friday to include some record values. The airmass moderates this weekend. 

Across Alaska, another approaching low will impact the mainland mid-latter this week with strong 
advance onshore flow into southern Alaska. This should bring another round of heavy precipitation 
across much of the same areas to be impacted during early week. The precipitation axis is expected 
to shift southward Friday, with heavy rain/mountain snow impacting much of the panhandle region. 
Strong flow well in advance of the system to the north will allow warmer than normal air to 
overspread the state in the short range. Temperatures across the North Slope and sections of Brooks 
range will average 20-25 degrees above normal through Halloween before moderating.

Schichtel