US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
331 PM EDT Tue Oct 27 2020
 
Valid Friday October 30 2020 - Tuesday November 03 2020
 
Hazards:
- Heavy precipitation across portions of the Mid-Atlantic, the Northeast, and the Great Lakes, Fri, 
Oct 30.
- Much below normal temperatures across portions of the Southern Rockies, and the Southern Plains,  
Fri, Oct 30.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Fri-Sun, Oct 
30-Nov 1.
 
Detailed Summary:

Post Tropical Cyclone ZETA and an area of low pressure moves off the Mid-Atlantic Coast late 
Thursday and are off the coast on Friday.  The low pressure will pull sufficient cold air out of 
Canada to interact with the tropical moisture from ZETA to produce an area of heavy precipitation 
over the Northeast on Friday.  The air should be cold enough to produce snow over the area and rain 
near the coast.  Leaves on trees may add an additional hazard of broken branches and downed power 
lines associated with the snow.  In the wake of the storms, high pressure will build over the East 
Coast on Saturday.  Low pressure over Southwestern Canada will move eastward across Southern Canada 
dragging a front across the Upper Midwest on Saturday moving into the Great Lakes by Sunday and off 
the East Coast on Monday.  High pressure will build over the Western U. S. on Saturday moving to 
the Rockies and Plains by Sunday and advancing to the Southeast by Tuesday.   

Meanwhile, cold temperatures over the Southern Rockies/Plains will begin to moderate after Thursday 
but the morning low temperatures over parts of the area will continue to be 12 degrees below normal 
on Friday morning.

For Alaska, low pressure over the Gulf of Alaska, on Friday, moving into the Alaska Panhandle by 
Saturday. The system will be accompanied by moisture that will, likewise, move into the Panhandle. 
The storm will produce heavy precipitation over the Alaska Panhandle on Friday into Sunday.

Ziegenfelder