Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
341 AM EDT Sat Aug 18 2018
Valid 12Z Sat Aug 18 2018 - 12Z Mon Aug 20 2018
...Active weather continues for the East Coast...
...Heavy rainfall expected to impact parts of the Plains and Mississippi
Valley this weekend...
...Air quality will remain a concern this weekend across much of the
Northwestern U.S. and also parts of the Upper Mississippi Valley...
A cold front stretching from New England to the southern Plains will be
the focus for showers and thunderstorms throughout the south and east this
weekend. As the cold front presses eastward across the Northeast,
Mid-Atlantic and Tennessee Valley, convection will fire along and ahead of
the boundary. Scattered to numerous thunderstorms will impact these
regions in addition to the Southeast. As the front stalls along the
Mid-Atlantic and Tennessee Valley on Sunday, this will give way to more
rounds of showers and thunderstorms. Some of these storms could produce
heavy downpours that may lead to flash flooding.
In the southern Plains, the front draped across Texas that is associated
with the cold front in the east will lift as a warm front by this
afternoon. Thunderstorms are expected along the boundary especially across
the Red River Valley. In addition, thunderstorms are also expected in the
High Plains along the lee trough--with a marginal risk of severe weather
possible with this activity. By tonight, a surface low accompanying this
warm front will lift north and east from the Plains to the Mississippi
Valley. Heavy rain is expected near this low, and will move from the
southern/central Plains on Sunday into the middle Mississippi Valley by
Monday. A slight risk of flash flooding is possible along with a marginal
risk of severe weather.
Fire weather in the Intermountain West and parts of the Great Basin remain
elevated today. Red flag warnings are in effect for parts of Idaho,
western Montana, and a small portion of Utah. Furthermore, air quality
from these fires remain an issue across parts of California, the Pacific
Northwest, in addition to the Upper Midwest--with these regions having air
quality alerts in effect.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php