US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
400 PM EDT Thu Oct 01 2020
 
Valid Sunday October 04 2020 - Thursday October 08 2020
 
Hazards:
- Heavy rain across portions of the Southeast and the Mid-Atlantic, Sun, Oct 4.
- Heavy rain across portions of the Southeast, Wed, Oct 7.
- Flooding possible across portions of the Southeast and the Mid-Atlantic.
- High winds across portions of the Great Lakes, the Upper/Middle Mississippi Valley, the Central 
Appalachians, and the Ohio Valley,Mon-Wed, Oct 5-Oct 7.
- Much above normal temperatures across portions of California, the Northern/Central Great Basin, 
and the Pacific Northwest, Sun, Oct 4.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Sun-Mon, Oct 
4-Oct 5.
 
Detailed Summary:

A wave of low pressure along a front just off northeast Florida and Georgia coast, on Sunday, will 
move northward to off of Cape Hatteras by Monday.  Tropical moisture will pool along the front and 
the low producing heavy rain along the Carolina Coast and the Southeast Coast along with Central 
Florida Peninsula on Sunday into Monday morning.  The front will linger across the Florida 
Peninsula through Thursday which could be the focus for heavy rain each day but confidences is low 
on Monday and Tuesday.  Moisture will surge northward on Tuesday into Wednesday aiding in the 
development of a second area of heavy rain over the Florida Peninsula on Wednesday.

Meanwhile, upper-level ridging over the western third of the country will roughly continue through 
Thursday.  Minor upper-level impulses will move across the Pacific Northwest with weak low pressure 
moving over the area on Wednesday into Thursday.  These disturbances will aid in keeping the 
maximum temperatures from reaching the twelve degrees or great above normal level from Monday into 
Thursday.  On Sunday, the upper-level ridge will hold on enough to allow the temperatures to reach 
the criteria for much above normal temperatures over parts of the Pacific Northwest, Northern 
California, and parts of the Great Basin.  The warmer than average temperatures could keep the fire 
risk high across these areas. 

A front over Western Canada, on Sunday, will move eastward to the Upper Great Lakes by Tuesday then 
move off the Northeast Coast overnight Wednesday.  A strong pressure gradient will develop ahead of 
the system and an area of high pressure over the Upper Midwest, on Sunday, that will move into the 
Great Lakes on Tuesday.  As the system moves eastward the pressure gradient will decrease by 
Thursday.  The pressure gradient will aid in produce strong wind over the Upper Great Lakes, parts 
of the Lower Great Lakes, and the Ohio Valley on Monday into Wednesday.  The wind will be the 
strongest over the waters of the Great Lakes.   

Over Alaska, deep area of low pressure over the Gulf of Alaska, on Sunday, will slowly move the the 
coast of the mainland and slowly weaken by Tuesday.  Moisture associated with the system will 
stream into the Gulf Coast and the Alaska Peninsula on Sunday and Monday.  The system will produce 
a region of heavy precipitation over the mainland into the peninsula from the Kenal Peninsula to 
near Sitka on Sunday into Monday.  

Ziegenfelder