Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
416 AM EDT Sun Jul 27 2014
Valid 12Z Sun Jul 27 2014 - 12Z Tue Jul 29 2014
...Flash flooding and severe weather possible across the Central
Appalachians and northern Mid-Atlantic states...
...Another round of cooler and drier Canadian air will spread
southeastward through the Central and Eastern U.S....
...Heavy rains and localized flash flooding expected over southeast
Showers and thunderstorms will continue to fire up within a moist and
unstable airmass in place from the Great Lakes and Ohio Valley into the
Northeast and Mid-Atlantic states. A rather robust piece of energy diving
down from Canada should help organize some of the thunderstorm
activity...especially ahead of a strengthening surface low and cold front
crossing the Central Appalachians on Sunday and pushing into the northern
Mid-Atlantic states Sunday night. Developing storms could contain heavy
downpours...damaging winds...large hail...and even an isolated tornado.
Heavy rains and strong storms will continue to be a possibility with this
system as it lifts through the Northeast on Monday. Farther south...the
cold front will help trigger scattered showers and thunderstorms while
dropping through the southern tier of the Nation.
A strong surface high setting up over the north central U.S. will bring
another round refreshing Canadian air into the Upper Midwest on Sunday.
The cooler and drier conditions will spread southeastward through much of
the Central and Eastern U.S. early this week.
Monsoonal moisture will continue to fuel widespread convection across the
Southwest and Central Rockies Sunday and Monday afternoons. Localized
areas of flash flooding will be possible across southeast Colorado...where
the moisture will interact with a frontal boundary stretched along the
front range to produce organized areas of heavy rains. Farther
north...temperatures will be on the rise in the Northern Rockies and
Northern Intermountain West as an expansive upper ridge sprawled across
the south central U.S. builds northward through the region.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php