The Weather Prediction Center

Short Range Forecast Discussion

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Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
405 PM EDT Sun Apr 23 2017

Valid 00Z Mon Apr 24 2017 - 00Z Wed Apr 26 2017

...Heavy rain over the Southeast is expected to move up the East
Coast Monday into Tuesday...

...Unsettled weather continues across much of the western U.S....

A trend towards a more amplified upper-level pattern is
anticipated across the U.S., which will translate to more
unsettled conditions during the next few days.  A deepening low
pressure system has been bringing widespread rain over the
interior section of the Southeast along with some thunderstorms
near the Gulf Coast.  This low will begin to interact with a
tropical low currently bringing heavy rain over southern Florida,
and merge as they approach coastal Carolinas Monday evening. 
Abundant moisture will then spread northward up the mid-Atlantic
coast on Monday and into New England on Tuesday.  It appears that
the low will be slow to move out as rain should continue to last
into Tuesday evening across much of the mid-Atlantic and New
England coasts.  As tropical moisture is expected to be injected
into the system, there is some potential for rainfall along the
East Coast during the next couple of days.

Over the western U.S., persistent deep-layer onshore flow has been
bringing unsettled weather and cool conditions into the region. 
This pattern is expected to continue for the next few days with
periods of rain and high-elevation snow across a wide area from
all of the Pacific Northwest down to the Sierra Nevada and
eastward across the Intermountain and much of the northern and
central Rockies.  The upper-level energy will reach the Plains and
interact with a cold front over the northern Plains on Monday. 
Temperatures will be cold enough to support wintry precipitation
near the Canadian border on Monday with rain farther south and
falling temperatures behind the cold front.  As the cold front
pushes southward, the chance of thunderstorms will increase across
the central Plains Tuesday evening.  Above normal temperatures
will drastically drop well below normal across the Plains on
Tuesday following the frontal passage.


Graphics available at

Last Updated: 405 PM EDT Sun Apr 23 2017