Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
359 PM EDT Mon Jul 24 2017

Valid 00Z Tue Jul 25 2017 - 00Z Thu Jul 27 2017

...Severe weather and flash flooding possible across the northern Plains
to the Middle Mississippi Valley on Tuesday and Wednesday...

...Localized flooding will be a concern for the Southwest and southern and
central Rockies for the next few days...


A strong front that will begin dropping into the northern Plains tonight
will have showers and thunderstorms develop along and ahead of the
boundary.  By Tuesday, as the front progesses eastward, these storms could
bring flash flooding and severe weather to the Upper Midwest and portions
of the Middle Mississippi Valley.  The threat of flash flooding and severe
weather is expected to continue into Wednesday as the front slows as it
stretches from the Great Lakes to the southern parts of the northern
Plains. 

Monsoonal moisture along with daytime heating will set off thunderstorms
in the afternoon and evening throughout the Southwest and southern and
central Plains through the short term period. These thunderstorms have the
capability of producing heavy downpours that could lead to flash flooding.
By Tuesday, an upper level low will begin to move over
California--igniting showers and thunderstorms across the Great Basin and
northern Rockies.  The upper level low will weaken by Wednesday as it
moves eastward over the Intermountain West--keeping showers and
thunderstorms along the Rockies while a decrease in precipitation coverage
is expected in the Great Basin. 

Over the next few days, widespread showers and thunderstorms are expected
across the Southeast as a cold front sinks southward into the Tennessee
Valley and stalls.  With plenty of moisture from the Gulf of Mexico on tap
and daytime heating, most of the thunderstorm activity is expected to
occur in the late afternoon and evening throughout the short term period.
There is a slight risk of excessive rainfall this evening and into tonight
in the western Gulf Coast region. By Tuesday and Wednesday,


Reinhart

Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php