US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
249 PM EST Wed Nov 20 2019
 
Valid Saturday November 23 2019 - Wednesday November 27 2019
 
Hazards:
- Heavy precipitation across portions of the Northeast, Wed, Nov 27.
- Heavy rain across portions of the Lower and Middle Mississippi Valley, the Tennessee Valley, the 
Northern Great   Basin, the Southern Appalachians, the Pacific Northwest, and the Ohio Valley, 
Mon-Tue, Nov 25-Nov 26.
- Heavy precipitation across portions of California and the Pacific Northwest, Mon-Wed, Nov 25-Nov 
27.
- Heavy rain across portions of the Mid-Atlantic, the Northeast, and the Central Appalachians, Wed, 
Nov 27.
- Heavy snow across portions of the Great Lakes, Wed, Nov 27.
- Flooding occurring or imminent across portions of the Northern Plains.
- Heavy precipitation across portions of mainland Alaska, Mon-Tue, Nov 25-Nov 26.
- Heavy precipitation across portions of mainland Alaska, Tue-Wed, Nov 26-Nov 27.
- High winds across portions of mainland Alaska, Mon-Tue, Nov 25-Nov 26.
- High significant wave heights for coastal portions of mainland Alaska, Mon-Tue, Nov 25-Nov 26.
 
Detailed Summary:

The passage of multiple impulse/jet energies in fast flow into the Pacific Northwest offers an 
emerging threat of some heavy coastal rains and inland elevation snows by early next week. Digging 
cold flow into midweek should also support the spread of snow increasingly inland, especially into 
favored terrain across the north-central Great Basin/Rockies.

Downstream low/trough strengthening over the south-central U.S. may support deep lead Gulf of 
Mexico moisture return to fuel a risk of heavy rainfall/convection from the Mid-South to the 
southern Appalachians early next week. The potential to spin-up a well organized/deep low over the 
Great Lakes into next midweek would also offer a threat for wrap-back heavy snow over the Upper 
Great Lakes and areas with heavy rain and snow/ice to focus over the interior Northeast as 
additional Atlantic moisture wraps around the deepening low/frontal system.

Over Alaska, strong flow around a deepened Bering Sea low will support early-mid next week heavy 
winds/waves and precipitation for especially coastal and marine areas from the Seward Peninsula 
down to Bristol Bay. Heavy precipitation will also spread through next midweek to 
Southwest/Southern Alaska as energy works into that region with downstream low developments and 
inflow.

Schichtel