US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
314 PM EDT Wed Oct 09 2019
 
Valid Saturday October 12 2019 - Wednesday October 16 2019
 
Hazards:
- Heavy rain across portions of the Pacific Northwest, Wed, Oct 16.
- Heavy rain across portions of the Lower Mississippi Valley, the Southern Plains, and the 
Tennessee Valley, Tue-Wed, Oct 15-Oct 16.
- Heavy snow across portions of the Upper Mississippi Valley and the Northern Plains, Sat-Sun, Oct 
12-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 Central Plains, the Upper Mississippi Valley, and the Northern 
Plains, Sat-Sun, Oct 12-Oct 13.
- High winds across portions of the Great Lakes, Sun-Mon, Oct 13-Oct 14.
- Much below normal temperatures across portions of the Northern/Central Plains, the Upper/Middle 
Mississippi Valley, and the Great Lakes,  Sat-Tue, Oct 12-Oct 15.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Mon-Wed, Oct 
14-Oct 16.
- High winds across portions of the Aleutians, Sun-Tue, Oct 13-Oct 15.
- High significant wave heights for coastal portions of the Aleutians, Mon-Wed, Oct 14-Oct 16.
 
Detailed Summary:

A deep storm over the Upper Mississippi will move northeastward to James Bay in Canada by 
Wednesday.  The system will produce heavy snow on Saturday over parts of the Upper Midwest a long 
the U.S./Canadian border.  The snow will be wet and with some leaves on trees that may produce 
hazardous conditions in the form of broken branches and down power lines.  The deep storm will 
produce high winds may develop over parts of the Upper Midwest on Saturday into Sunday morning.  In 
addition, a deep upper-level trough associated with the storm will aid in producing much below 
normal temperatures on Saturday into Sunday morning over from the Northern High Plains eastward to 
parts of the Upper Great Lakes.  High winds are also possible over and near parts of Lake Huron on 
Sunday into Monday morning.

Meanwhile, a front extending from the Great Lakes southwestward to the Southern Plains, on Tuesday, 
will move southeastward to the Northeast southwestward to the Western Gulf Coast by Wednesday.  The 
boundary will intersect moisture over parts of the Southern Plains into parts of the Lower 
Mississippi Valley/Tennessee Valley that will aid in producing heavy rain over parts of the region 
on Tuesday into Wednesday morning.  Furthermore, a 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 Wednesday.

Over Alaska, deep low pressure over the Gulf of Alaska and associated plume of moisture will aid in 
producing an area of heavy precipitation over the Alaska Panhandle on Monday into Wednesday 
morning.  On Sunday into Tuesday/Wednesday, 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 Sunday into Wednesday.

Ziegenfelder