Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
239 AM EDT Sun Jul 23 2017
Valid 12Z Sun Jul 23 2017 - 12Z Tue Jul 25 2017
...Flash flooding and severe weather will be possible over portions of
Mid-Atlantic states this weekend...
...Dangerous heat is expected to continue for the central Plains and
Middle Mississippi Valley to the Mid-Atlantic coast through the weekend...
...Localized flooding possible across the Southwest and southern and
central Rockies over the next few days...
A frontal boundary will slowly push across the Mid Atlantic and Ohio
Valley, becoming a focus for showers and thunderstorms. A hot and humid
air mass in place across much of the region will support strong to severe
thunderstorms and localized heavy rainfall on Sunday. Parts of the central
Appalachians could see some flash flooding as the storms move over already
saturated soils. The front will linger across the Mid Atlantic for Monday
with showers and thunderstorms spreading into the Northeast but no severe
weather or flash flooding is expected at this time. Further west, the
front will sag southward across the southern Plains and Tennessee Valley
with showers and thunderstorms expected across much of the Southeast.
Dangerous heat will continue across parts of the central U.S. and southern
Mid Atlantic on Sunday. High temperatures will reach into the mid and
upper 90s to near 100 degrees across parts of the southern Plains, mid
Mississippi Valley, and into the southern Mid Atlantic. Those temperatures
combined with very high dewpoints will lead to heat index values of 100 to
115 across much of the region. At least some relief should arrive on
Monday as the front nears with showers and thunderstorms expected.
Monsoonal moisture along with daytime heating will trigger thunderstorms
across the Southwest and the southern half of the Rockies on Sunday.
Heavy downpours associated with these thunderstorms could lead to
localized flash flooding. The flash flood threat will be a bit more
focused across Arizona for Monday.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php