Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
309 AM EST Tue Nov 19 2019
Valid 12Z Tue Nov 19 2019 - 12Z Thu Nov 21 2019
...Freezing rain and snow to impact portions of Upstate New York into New
England into Tuesday...
...Possible flash flooding for portions of the southwestern U.S. beginning
Tuesday evening along with colder weather arriving by Wednesday...
An advancing upper level trough from the central Appalachians and northern
Mid-Atlantic, combined with the departing coastal storm, will aid in the
production of wintry weather for the Northeast. Initially, freezing rain
may occur over portions of eastern Upstate New York but is expected to
quickly transition to snow Tuesday morning- ice accumulations less than
0.25 inch with 1 to 3 inches of snow may be possible before the
precipitation tapers off Tuesday afternoon/early evening. Heavier bands of
snow will likely setup over northern Maine. A cold rain is expected for
the coastal cities from Portland to Boston and New York.
Tropical moisture from the remnants of Tropical Cyclone Raymond will be
transporting northward into the Desert Southwest into the path of
a strong closed upper low west of the Baja Peninsula. As this frontal
system progresses through the Great Basin/Four Corners region,
temperatures will drop significantly while showers and thunderstorm
activity increases across southern California, Arizona and New Mexico into
southern Utah by midday Tuesday. Moderate to heavy rain is expected for
much of Arizona and will quickly elevate the risk for flash flooding. WPC
has a Moderate Risk for excessive rainfall in effect for portions of
Arizona through Thursday morning where 1-3 inches of rain are forecast
through Wednesday afternoon. During this time the daily maximum
temperatures will range from 10 to 20 degrees cooler than average across
this section of the country.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php