BREAKING WEATHER:  AIRPORT DELAYS
National Weather Outlook: 9-13-2017

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
411 AM EDT Wed Sep 13 2017

Valid 12Z Wed Sep 13 2017 - 12Z Fri Sep 15 2017

...Wet snow possible over parts of the highest elevation of the
Northern Rockies Thursday evening into Friday...

...Temperatures will 10 to 15 degrees below average over parts of
the Tennessee and Ohio Valleys...

Low pressure over the Middle Mississippi Valley will slowly wind
down and move to the Western Ohio Valley while dissipating by
Thursday afternoon.  Rain will develop over parts of the
Ohio/Tennessee Valleys that will move into parts of the
Central/Southern Appalachians by Thursday evening.  Moisture will
flow off the Atlantic over parts of the Mid-Atlantic and aid in
developing showers and thunderstorms over parts of the area that
will move into parts of the Northern Mid-Atlantic Coast by
Wednesday evening.  Upper-level energy once associated with Irma
will move over parts of the Northeast on Thursday into Thursday
evening.  The energy will aid in producing showers and
thunderstorms over parts of the Northeast on Thursday.

Meanwhile, tropical moisture will slowly creep northward over the
Florida peninsula that will move into parts of the Southeast by
Wednesday evening.  The moisture will move off the Southeast Coast
by Thursday morning.  Showers and thunderstorms will develop over
parts of the southern peninsula of Florida on Wednesday that will
continue over parts of the Southern Florida through Thursday
evening.  In addition, showers and thunderstorms will develop over
parts of the Southeast by Wednesday afternoon that will move off
the Southeast Coast by Thursday morning.

Additionally, a quasi-stationary front extending from the Upper
Mississippi Valley into the Northern/Central Plains then into
parts of the Northern High Plains/Great Basin will aid in
developing showers and thunderstorms over parts of the
Northern/Central Plains on Wednesday that will end by Wednesday
evening.  Showers and thunderstorms will also develop over parts
of the Northern Rockies/Northern High Plains by Wednesday
afternoon that will move into parts of the Northern/Central Plains
and the Upper Mississippi Valley by Thursday morning continuing
over the region through Thursday evening.  An upper-level
troughing will move into the Northern Rockies on Thursday into
Thursday evening.  Rain will develop over parts of the Northern
Rockies overnight Wednesday and continue into Thursday evening.
On Thursday evening, wet snow will develop over parts of the
highest elevations of the Northern Rockies.

Furthermore, an upper-level low moving onshore over Central
California will move inland while weakening to parts of the
Southwest/Great Basin by Thursday evening.  Circulation around the
upper-level low will aid in pulling moisture off the Gulf of
California/Pacific into parts of the Southwest that will weaken by
Thursday afternoon.  The moisture and the energy will aid in
producing showers and thunderstorms over parts of Central
California into parts of the Great Basin/Southwest and parts of
the Southern/Central Rockies through Thursday evening.


Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
411 AM EDT Wed Sep 13 2017

Valid 12Z Wed Sep 13 2017 - 12Z Fri Sep 15 2017

...Wet snow possible over parts of the highest elevation of the
Northern Rockies Thursday evening into Friday...

...Temperatures will 10 to 15 degrees below average over parts of
the Tennessee and Ohio Valleys...

Low pressure over the Middle Mississippi Valley will slowly wind
down and move to the Western Ohio Valley while dissipating by
Thursday afternoon.  Rain will develop over parts of the
Ohio/Tennessee Valleys that will move into parts of the
Central/Southern Appalachians by Thursday evening.  Moisture will
flow off the Atlantic over parts of the Mid-Atlantic and aid in
developing showers and thunderstorms over parts of the area that
will move into parts of the Northern Mid-Atlantic Coast by
Wednesday evening.  Upper-level energy once associated with Irma
will move over parts of the Northeast on Thursday into Thursday
evening.  The energy will aid in producing showers and
thunderstorms over parts of the Northeast on Thursday.



Meanwhile, tropical moisture will slowly creep northward over the
Florida peninsula that will move into parts of the Southeast by
Wednesday evening.  The moisture will move off the Southeast Coast
by Thursday morning.  Showers and thunderstorms will develop over
parts of the southern peninsula of Florida on Wednesday that will
continue over parts of the Southern Florida through Thursday
evening.  In addition, showers and thunderstorms will develop over
parts of the Southeast by Wednesday afternoon that will move off
the Southeast Coast by Thursday morning.

Additionally, a quasi-stationary front extending from the Upper
Mississippi Valley into the Northern/Central Plains then into
parts of the Northern High Plains/Great Basin will aid in
developing showers and thunderstorms over parts of the
Northern/Central Plains on Wednesday that will end by Wednesday
evening.  Showers and thunderstorms will also develop over parts
of the Northern Rockies/Northern High Plains by Wednesday
afternoon that will move into parts of the Northern/Central Plains
and the Upper Mississippi Valley by Thursday morning continuing
over the region through Thursday evening.  An upper-level
troughing will move into the Northern Rockies on Thursday into
Thursday evening.  Rain will develop over parts of the Northern
Rockies overnight Wednesday and continue into Thursday evening.
On Thursday evening, wet snow will develop over parts of the
highest elevations of the Northern Rockies.

Furthermore, an upper-level low moving onshore over Central
California will move inland while weakening to parts of the
Southwest/Great Basin by Thursday evening.  Circulation around the
upper-level low will aid in pulling moisture off the Gulf of
California/Pacific into parts of the Southwest that will weaken by
Thursday afternoon.  The moisture and the energy will aid in
producing showers and thunderstorms over parts of Central
California into parts of the Great Basin/Southwest and parts of
the Southern/Central Rockies through Thursday evening.



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