Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
412 AM EDT Sat May 19 2018

Valid 12Z Sat May 19 2018 - 12Z Mon May 21 2018

...There is a slight risk of severe thunderstorms over parts of the
Southern High/Central Plains into parts of the Middle Mississippi Valley...

...Heavy rain possible over parts of the Southern Plains into the Middle
Mississippi Valley...

...Heavy rain possible over parts of Florida into parts of the Southern
Mid-Atlantic...

..Temperatures will be 10 to 25 degrees below average over parts of the
Central Plains...

Weakening upper-level energy over the Ohio Valley will lift northeastward
into New England by Sunday merging with stronger upper-level energy moving
over Southeastern Canada Sunday evening into Monday.  A plume of moisture
extending from Florida northward to the Northern Appalachians into parts
of the Great Lakes will continue over most of the East Coast through
Monday.  The moisture and energy will aid in producing rain and
thunderstorms over parts of the Great Lakes/Ohio Valley into the
Mid-Atlantic/Southeast that will move into Northern New England by Sunday
morning.  The rain and thunderstorms continue over parts of the
Mid-Atlantic/Lower Great Lakes through Sunday morning.  The rain and
embedded thunderstorms will move off the Northeast/Northern Mid-Atlantic
Coast overnight Sunday.  While the showers and thunderstorms will continue
over the Southern Mid-Atlantic into the Southeast through Sunday evening
into Monday.

Another area of upper-level energy over the Central Plains will slowly
move eastward to parts of the Middle Mississippi Valley by Sunday night. 
The energy will interact with moisture over the Plains and the Mississippi
Valley to produce showers and thunderstorms over parts of the
Northern/Central Rockies into parts of the Central Plains that will expand
into parts of the Southern Plains by Saturday evening.  By Sunday morning,
the showers and thunderstorms will extend from parts of the Middle
Mississippi/Western Ohio Valleys into the Southern Plains that will expand
into the Ohio/Tennessee Valleys and parts of the Central/Southern
Appalachians into parts of the Eastern Gulf Coast by Sunday evening. 

Meanwhile, upper-level energy over the Pacific Northwest will lift
northeastward into Southwestern Canada by Sunday morning as additional
upper-level energy develops a deep trough over the West Coast by Sunday
evening into Monday.  The energy over the Pacific Northwest will trigger
light rain over parts of the area into parts of the Northern Rockies on
Saturday morning.  The developing upper-level trough will aid in producing
showers and thunderstorms over parts of Northwest/Northern Rockies and
parts of California/Great Basin by Saturday evening that will move into
parts of the Central Rockies by Sunday evening. 


Ziegenfelder


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