Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
300 PM EST Mon Nov 18 2019
Valid 00Z Tue Nov 19 2019 - 00Z Thu Nov 21 2019
...Freezing rain and snow to impact portions of Upstate New York into New
England tonight into Tuesday...
...Possible flash flooding for portions of the southwestern U.S. beginning
Tuesday evening along with colder weather arriving by Wednesday...
A coastal storm tracking northward about 200 miles east of the New England
coast combined with an upper level trough approaching from the central
Appalachians and northern Mid-Atlantic will aid in the production of
wintry weather for the Northeast. Freezing rain is expected to develop
along the eastern sections of Upstate New York into northern New England
beginning tonight and transition to snow early Tuesday morning. The
majority of precipitation will exit the region by Tuesday afternoon
leaving behind one to two tenths of ice along with 1-3 inches of snow.
Locally heavier snow is expected for far northern Maine where the
precipitation type will likely remain predominantly as snow. A cold rain
is expected for the coastal cities from Portland to Boston and New York.
Across the western U.S., moisture from the remains of Tropical Storm
Raymond in the eastern Pacific and a strong closed upper low west of the
Baja Peninsula should allow anomalous moisture to spread northward into
southern California and the desert Southwest on Tuesday. Showers and
thunderstorm coverage will increase Tuesday afternoon and evening across
southern California, Arizona and New Mexico into southern Utah. Locally
heavy rainfall rates may result in flash flooding Tuesday night into
Wednesday, especially across central and western Arizona where 1-3 inches
of rain are forecast through Wednesday afternoon. Cooler weather will also
make its way into the southwestern U.S. bringing the region's high
temperatures into 10-20 degree below average range for Wednesday.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php