Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
259 PM EST Mon Nov 29 2021

Valid 00Z Tue Nov 30 2021 - 00Z Thu Dec 02 2021

...Light to moderate rain showers to return over portions of the Pacific
Northwest on Tuesday into Wednesday morning...

...Light snow over the Great Lakes into New England; lake effect snow
returns downwind from Lake Ontario on Tuesday...

...Temperatures will be 15 to 20 degrees above average over parts of the
Northern Rockies and Plains; Elevated Fire Weather Risk for southern
California...

Weak onshore flow off the Pacific will aid in producing light rain over
parts of the Northwest Coast through Tuesday morning when a plume of
moisture returns to the Northwest ending on Wednesday morning. When the
moisture plume returns on Tuesday, light to moderate rain showers will
return to the region. Therefore, the WPC has issued a Marginal Risk of
excessive rainfall over parts of the Pacific Northwest on Tuesday into
Wednesday morning.  The associated heavy rain will create localized areas
of flash flooding, affecting areas that experience rapid runoff with heavy
rain.

Meanwhile, low pressure moves across the Great Lakes overnight Monday into
Tuesday.  The system will produce light snow over parts of the Upper Great
Lakes tonight that moves to the Lower Great Lakes by Tuesday.  At this
time, lake effect snow develops downwind from Lake Ontario. The light snow
continues over the Lower Great Lakes into the Northeast through early
Wednesday morning when the snow stops for a short time.  Another area of
low pressure moves into the Great Lakes on Wednesday.

On Tuesday evening, the system produces light snow and rain over parts of
the Northern Plains that moves into the Upper Mississippi Valley/Upper
Great Lakes on Wednesday morning. On Wednesday, rain develops over parts
of the Ohio Valley and expands into parts of the Mid-Atlantic by Wednesday
evening. Furthermore, upper-level ridging over the western quarter of the
country will allow temperatures to be 15 to 20 degrees above average over
parts of the Northern Rockies and Plains.  Additionally, dry fuels and
offshore gusty wind will aid in producing an Elevated risk of fire weather
over parts of Southern California through Wednesday morning.

Ziegenfelder

Graphics are available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php