Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
232 AM EST Wed Nov 20 2019
Valid 12Z Wed Nov 20 2019 - 12Z Fri Nov 22 2019
...Heavy mountain snow over the Central/Southern Rockies as well as the
Great Basin/Southwest and moderate snow over the Northern Tier States
along the border with Canada...
...There is a moderate risk of excessive rainfall over parts of the
...There is a critical risk of wildfire spreading over parts of
A long stretch of warmer and drier conditions over parts of
northern/central California has primed that area for potential spread of
wildfires and this airmass is expected to persist through the end of the
week. As such, there is a critical risk for wildfires across northern
California through Thursday morning.
For the Southwest U.S., mountain snow and moderate to heavy rain in the
lower elevations is expects as a deep up-level low tracks east across the
region. The precipitation shield will shift into the Southern/Central
Rockies/High Plains as the front approaches. The intensity and during of
some of these downpours will likely lead to numerous flash flooding of
many streams and potentially affecting larger rives through Thursday
morning. Much of west-central and southern Arizona has a Slight to
Moderate Risk for Excessive Rainfall.
Rain and snow will spread across the central states and into the Upper
Mississippi Valley/Upper Great Lakes region by through Friday as a low
pressure system lifts northeast during this time. Light snow will fall
across the higher terrain of the Northeast
Low pressure over the Central High Plains will move northeastward to the
Great Lakes by Thursday evening. The system will produce rain and snow
over parts of the Central/Northern Plains into the Upper Mississippi
Valley/Upper Great Lakes overnight Wednesday into Thursday evening.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php