US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
447 PM EDT Tue Oct 08 2019
 
Valid Friday October 11 2019 - Tuesday October 15 2019
 
Hazards:
- Heavy rain across portions of the Lower Mississippi Valley and the Pacific Northwest, Tue, Oct 15.
- Heavy rain across portions of the Northeast, Fri-Sat, Oct 11-Oct 12.
- Heavy snow across portions of the Upper Mississippi Valley and the Northern Plains, Fri-Sun, Oct 
11-Oct 13.
- Flooding possible across portions of the Upper/Middle Mississippi Valley, the Great Lakes, 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 Northern Plains.
- High winds across portions of the Northern/Central Plains, the Northeast, and the Upper 
Mississippi Valley, Fri-Sat, Oct 11-Oct 12.
- High winds across portions of the Great Lakes, Sat-Sun, Oct 12-Oct 13.
- Much below normal temperatures across portions of the Plains, the Northern/Central Rockies, the 
Great Basin, the Upper/Middle Mississippi Valley, California, the Pacific Northwest, and the 
Southwest, Fri-Sat, Oct 11-Oct 12.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Fri-Sat, Oct 
11-Oct 12.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Mon-Tue, Oct 
14-Oct 15.
- High winds across portions of the Aleutians, Sun-Tue, Oct 13-Oct 15.
- High significant wave heights for coastal portions of the Aleutians, Sun-Tue, Oct 13-Oct 15.
 
Detailed Summary:

A storm over the Upper Mississippi will deepen significantly by Saturday, while the system moves 
northeastward to near James bay in Canada by Tuesday.  The system will produce heavy snow on Friday 
into Saturday morning over parts of the Upper Midwest.  The snow will be wet and with some leaves 
on trees may produce hazardous conditions in the form of broken branches and down power lines.  As 
the storm deepens, high winds may develop over parts of the Upper Midwest on Friday into Saturday 
morning.  In addition, a deep upper-level trough associated with the storm will aid in producing 
much below normal temperatures on Friday into Saturday morning.  High winds are also possible over 
parts of Lake Huron on Saturday into Sunday morning.  

Meanwhile, a deepening low just off the New England Coast will aid in producing high winds and 
heavy rain on Friday into Saturday morning over parts of New England.  On Monday, a warm front will 
move northward out of the Gulf of Mexico moving into parts of the Western/Central Gulf Coast by 
Tuesday.  Moisture surging northward along with the front will aid in producing heavy rain over 
parts of the Lower Mississippi Valley on Tuesday.  Furthermore, another warm front approaching the 
Pacific Northwest and associated plume of moisture will aid in producing heavy rain over parts of 
the Pacific Northwest Coast on Tuesday.         

Over Alaska, low pressure over the Gulf of Alaska and associated plume of moisture will aid in 
producing an area of heavy precipitation from the Chugach Mountains southward into the Alaska 
Panhandle on Friday into Saturday morning.  Another area of low pressure over the Gulf of Alaska 
will move to the coast of the Alaska Panhandle on Monday into Tuesday.  Another plume of moisture 
will accompany the system producing an area of heavy precipitation over part of the Alaska 
Panhandle on Monday into Tuesday.  On Sunday into Tuesday, what was  once Super Typhoon HAGIBIS 
will become extra tropical and become a deep area of low pressure moving across parts of the 
Aleutian Islands.  The storm will bring high winds of 50 knots or greater and significant waves of 
20 feet or greater to the Aleutians on Monday into Tuesday. 

Ziegenfelder