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Short Range Public Discussion
 
(Caution: Version displayed is not the latest version. - Issued 0809Z Nov 19, 2019)
 
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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. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php