US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
418 PM EDT Thu Oct 17 2019
 
Valid Sunday October 20 2019 - Thursday October 24 2019
 
Hazards:
- Heavy precipitation across portions of the Pacific Northwest and the Northern Great Basin, 
Sun-Wed, Oct 20-Oct 23.
- Heavy rain across portions of the Middle/Lower Mississippi Valley, the Northern Plains, the 
Southern Mid-Atlantic, the Southeast, and the Southern Plains, Sun-Mon, Oct 20-Oct 21.
- Heavy rain across portions of the Middle/Lower Mississippi Valley, the Tennessee Valley, the 
Southeast, the Southern Plains, and the Ohio Valley, Mon-Tue, Oct 21-Oct 22.
- Heavy rain across portions of the Lower Great Lakes, the Northern Mid-Atlantic, and the 
Northeast, Tue-Wed, Oct 22-Oct 23.
- Heavy snow across portions of the Northern/Central Rockies, the Central Plains, and the Northern 
Great Basin, Sun-Mon, Oct 20-Oct 21.
- Severe weather across portions of the Central/Southern Plains and the Middle/Lower Mississippi 
Valley,  Sun, Oct 20.
- Severe weather across portions of the Southeast, the Lower Mississippi Valley, and the Tennessee 
Valley, Mon, Oct 21.
- Flooding possible across portions of the Northeast, the Upper Mississippi Valley, and the 
Northern Plains.
- Flooding occurring or imminent across portions of the Northern/Central Plains, the Upper/Middle 
Mississippi Valley, and the Great Lakes.
- Flooding likely across portions of the Upper Mississippi Valley and the Northern Plains.
- High winds across portions of the Central Rockies, the Central Plains, and the Central Great 
Basin, Tue-Wed, Oct 22-Oct 23.
- High winds across portions of the Great Lakes and the Upper Mississippi Valley, Tue-Thu, Oct 
22-Oct 24.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Wed-Thu, Oct 
23-Oct 24.
- High winds across portions of mainland Alaska and the Aleutians, Wed-Thu, Oct 23-Oct 24.
- High significant wave heights for coastal portions of mainland Alaska and the Aleutians, Wed-Thu, 
Oct 23-Oct 24.
 
Detailed Summary:

A front will move onshore over the Pacific Northwest on Sunday, moving eastward to the Great Lakes 
by Thursday. Moisture from the Pacific will move inland over the Northwest on Sunday into 
Wednesday.  The moisture will aid in producing heavy precipitation over the Cascades and the 
Olympic Mountains from Sunday into Wednesday morning.  There will be snow at higher elevations and 
rain at lower.

Post Tropical Cyclone SIXTEEN, over the North Carolina Coast, will move off the Southeast Coast out 
over the Western Atlantic on Sunday.  The system will produce an area of heavy rain over parts of 
the Southern Mid-Atlantic Coast on Sunday into Monday.

An area of low pressure over the Northern/Central Plains moves northeastward to Hudson Bay by 
Wednesday.  Between the area of low pressure and an area of high pressure will develop over parts 
of the Pacific Northwest into the Great Basin aiding in producing an area of high winds over parts 
of the Northern/Central Rockies and the Great Basin on Sunday into Monday.  As the area of low 
pressure moves by the Great Lakes, an area of high winds will develop over parts of the Great Lakes 
on Tuesday into Thursday.  In addition, the system will produce a small area of heavy rain over 
parts of the Northern Plains also on Sunday into Monday.  Furthermore, an area of severe weather 
will develop over parts of the Southern/Central Plains and parts of the Lower/Middle Mississippi 
Valley a long and ahead of the associated front on Sunday.  The system will also produce an area of 
heavy rain over the same area on Sunday.  On Monday into Tuesday heavy rain will develop along the 
associated front over parts of the Ohio/Tennessee Valleys into parts of the Lower Mississippi 
Valley/Central Gulf Coast.  The front will also produce and area of severe weather over parts of 
the Central/Eastern Gulf Coast into parts of the Tennessee Valley on Monday.  As the area of low 
pressure moves into Canada, the associated front will move across the Northeast on Tuesday into 
Wednesday. Moisture will pool along the front over the Northeast producing an area of heavy rain 
over the Northeast on Tuesday into Wednesday.

Over Alaska, low pressure over the Western Pacific will move northeastward to near the Alaska 
Peninsula by Wednesday absorbing other areas of low pressure over the region. The storm will 
produce an area of heavy precipitation from Kodiak Island on Wednesday into Thursday.  The storm 
will also produce an area of high winds and significant waves over the Eastern Aleutian Islands/ 
Alaska Peninsula to Kodiak Island on Wednesday into Thursday.    

Ziegenfelder