US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
252 PM EDT Wed Oct 23 2019
 
Valid Saturday October 26 2019 - Wednesday October 30 2019
 
Hazards:
- Heavy rain across portions of the Tennessee Valley, Ohio Valley, and Northeast, Sat-Sun, Oct 
26-Oct 27.
- Flooding possible across portions of the Northern Plains.
- Flooding occurring or imminent across portions of the Mississippi and Missouri River Valleys.
- Much below normal temperatures across portions of the Northern and Central Rockies and the 
Northern and Central Plains, Sun-Wed, Oct 27-Oct 30.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Sat-Mon, Oct 
26-Oct 28.
- Heavy rain across portions of mainland Alaska, Sat-Mon, Oct 26-Oct 28.
- Much above normal temperatures across portions of mainland Alaska, Sun-Tue, Oct 27-Oct 29.
- High significant wave heights for coastal portions of mainland Alaska and the Aleutians, Sat, Oct 
26.
 
Detailed Summary:

A wave of low pressure lifting from the Gulf Coast states to start the medium range period 
(Saturday) into the Ohio Valley/Northeast will intercept deep moisture flow from the Gulf of 
Mexico. This results in a rather broad area of heavy rainfall possible from northern portions of 
the Gulf Coast states, through much of the Tennessee/Ohio Valleys on Saturday, into the northern 
Mid-Atlantic and southern New England on Sunday. Behind this, an incoming cold front into the 
Western and Central U.S. will bring another shot of anomalously cold air into much of the Rockies 
and into the Plains states. A large much below normal temperatures area was included for today's 
outlook spanning the Northern and Central Rockies and into much of the northern and central Plains, 
generally where minimum temperature anomalies were near or below -12 degrees. This system may also 
generate some heavy snowfall in the higher elevations of Wyoming/Colorado, though it appears at 
this point to be too isolated to include a heavy snowfall area on the hazards chart. Gusty winds 
are also possible on the backside of the cold front at the end of the period (next Wednesday) 
across portions of the south-central Plains, though there is enough uncertainty on whether this 
will meet criteria for inclusion on the hazards graphic.

Alaska should also be quite active during the medium range period as a deep low pressure area moves 
over the Aleutians and into the Bering Sea this weekend and early next week. Steady 
south-southeasterly flow ahead of the cold front will funnel moisture into southern Alaska to fuel 
heavy precipitation potential from the Peninsula region into parts of western and southern Mainland 
Alaska as well. Much of this should be in the form of rain, with heavy snowfall possible in the 
higher terrain of south/southeast Alaska. As the low crosses the eastern Aleutians this weekend, 
significant waves may be possible across the far eastern Aleutian islands and along the southern 
coast of the Peninsula/Kodiak Island. Across the North Slope, much above normal temperatures appear 
likely after this weekend where maximum temperature anomalies could exceed +20 degrees, resulting 
in daytime highs rising to near freezing in some places.

Santorelli