Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
500 PM EDT Wed Aug 27 2014
Valid 00Z Thu Aug 28 2014 - 00Z Sat Aug 30 2014
...The threat of flash flooding is expected to move from the north-central
Plains into the Upper Midwest during the next couple of days...
It appears that the main focus of heavy rain over the next couple of days
will be in the mid-section of the Country moving slowly into the Upper
Midwest. This is in response to a frontal system moving slowly northward
across the central Plains as an upper-level trough approaches from the
central Rockies. The upper-level trough will also induce the formation of
surface low pressure centers along the front, where rain is expected to be
enhanced. A main surface low is forecast to move east-northeastward
across Nebraska and South Dakota tonight into Thursday, and then across
the Upper Midwest on Friday. Heavy rains and thunderstorms ahead of this
low could lead to flash flooding across the aforementioned areas.
Over the Northeast and into the Mid-Atlantic, mainly fine weather with
near normal to below normal temperatures can be expected behind a cold
front as Hurricane Cristobal passes safely well off the East Coast.
Summer heat will prevail to the south of the cold front with mainly dry
conditions across much of the South. The only exception will be near the
western Gulf Coast where a tropical low is slowly approaching Texas.
Showers and thunderstorms can be expected in the coastal areas but are
expected to become more widely scattered as the low is forecast to weaken
and become more diffused with time.
In the West, showers and thunderstorms in the Central/Southern Rockies
should become more isolated with time as the upper-level trough departs
the region. A cold front coming down from Canada can trigger some showers
and thunderstorms in the Northern Rockies late Thursday into Friday along
with summer heat. For the remainder of the West, weather should continue
to be fine and dry through Friday.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php