US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
417 PM EDT Tue Oct 22 2019
 
Valid Friday October 25 2019 - Tuesday October 29 2019
 
Hazards:
- Heavy rain across portions of the Southeast, the Middle/Lower Mississippi Valley, and the 
Tennessee Valley, Fri-Sun, Oct 25-Oct 27.
- Heavy rain across portions of the Southeast, the Southern Mid-Atlantic, the Southern 
Appalachians, and the Tennessee Valley, Tue, Oct 29.
- Flooding possible across portions of the Northern Plains.
- Flooding occurring or imminent across portions of the Northern/Central Plains, the Upper/Middle 
Mississippi Valley, and the Pacific Northwest.
- Much below normal temperatures across portions of the Central Plains, the Central Great Basin, 
the Northern Plains, the Northern Rockies, the Central Rockies, and the Northern Great Basin, 
Sun-Tue, Oct 27-Oct 29.
- Heavy precipitation across portions of mainland Alaska and the Aleutians, Fri-Sat, Oct 25-Oct 26.
- Heavy precipitation across portions of mainland Alaska and the Aleutians, Sat-Tue, Oct 26-Oct 29.
- High winds across portions of mainland Alaska and the Aleutians, Fri-Sun, Oct 25-Oct 27.
- High winds across portions of mainland Alaska, Sun-Mon, Oct 27-Oct 28.
- High significant wave heights for coastal portions of mainland Alaska and the Aleutians, Fri-Mon, 
Oct 25-Oct 28.
 
Detailed Summary:

Over Alaska on Friday, deep low pressure over the Aleutians will slowly move northward into the 
Bering Strait/Bering Sea by Tuesday.  A plume of moisture will stream into parts of the Aleutians 
on Friday.  The plume of moisture will move northeastward along the Aleutians into the mainland 
Alaska by Sunday and into the Alaska Panhandle and begin to dissipate by Tuesday.  The system will 
produce multiple hazards over the Aleutians into the Alaska Peninsula on Friday into Sunday into 
Monday.  The storm will produce an area of heavy rain over parts of the Aleutians into parts of the 
Alaska Peninsula on Friday into Saturday morning.  The tight pressure gradient associated with the 
deep low pressure will produce high winds over the Aleutians into the Alaska Peninsula from Friday 
into Sunday.  Similarly, the track of the strong winds over ocean will produce an area of 
significant waves over parts of the coast along the Aleutians into the Alaska Peninsula from Friday 
into Monday.  As the storm moves northward, moisture will move into mainland Alaska aiding in 
producing an area of heavy precipitation over parts of the Alaska Peninsula into the Alaska 
mainland and as far east as Chugach Mountains on Saturday into Tuesday.  Additionally, an area of 
high winds will develop over Kodiak Island into the Western portion of the Kenal Peninsula on 
Sunday into Monday.

For the lower forty-eight, cold high pressure and deep upper-level troughing will aid in producing 
an area of much below normal temperatures over parts of the Northern Rockies and the Northern High 
Plains from Sunday into Tuesday.  A front extending from the Northeast across the Central 
Appalachians then southwestward into the Western Gulf Coast/Lower Mississippi Valley will develop a 
wave of low pressure over the Western Gulf Coast/Lower Mississippi Valley on Saturday. The area of 
low pressure will move northward to the Western Ohio Valley by Sunday.  Moisture from the Gulf of 
Mexico will pool along the boundary aiding in producing an area of heavy rain over parts of the 
Lower Mississippi Valley into parts of the Middle Mississippi Valley/Tennessee Valley on Friday 
into Sunday morning.  Very moist air off the Gulf of Mexico will stream into parts of the Southern 
Appalachians on Tuesday producing an area of heavy rain.  

Ziegenfelder