Area Forecast Discussion
Issued by NWS Kansas City/Pleasant Hill, MO

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
FXUS63 KEAX 241950

250 PM CDT MON AUG 24 2015

Issued at 250 PM CDT MON AUG 24 2015

Very quiet weather pattern in place across the Nation`s midsection
this afternoon as upper-level ridging continues to build across the
Intermountain West and Northern Rockies. Downstream...broad
northwest flow prevails over our region with afternoon water vapor
imagery revealing a few inbound mid-level shortwaves seen off to our
northwest. Fortunately however...arriving mid-level disturbances have
virtually no moisture to work with...compliments of sfc high pressure
and a northerly pressure gradient which extends across much of the
Great Plains/Lwr Missouri Vly. All told...tonight is shaping up to be
unseasonably cool once again...with clear skies and calm winds
allowing for optimal radiational cooling conditions. As such...expect
lows early Tuesday morning to range in the lower to middle 50s across
much of the area...with a few low 40s possible up towards the Iowa
state line and interior river valley locations.

Dry and pleasant weather to continue through both Tuesday and
Wednesday as high pressure remains in firm control. Next weather
feature of interest set to arrive early Thursday morning as a weak
warm front approaches our region from the west. Quick look at several
theta surfaces reveals weak ascent along the 305-310 surfaces as a
weak low-level jet impinges along the boundary. Despite this...BUFKIT
soundings continue to reveal a very dry atmosphere in place across
our region which will require a fair amount of moistening before
measurable precip is able to make it to the surface.
In addition...mid-level height fields do reveal a weak shortwave
trough that should be accompanying the front as it approaches. In
response to both the front and the upper wave...cannot totally cannot
rule out some light shwrs/iso storms heading into Thursday
morning...but majority of the area will likely see little if any
precip. Similar message for Thursday as warm front continues to very
slowly lift northeast with time. As this occurs...high pressure in
place across the Great Lakes will continue to supply dry low-level
air over the Lwr Missouri Vly. As a result...have held precip
mention to slgt chc for now.

Scenario begins to change some by Friday as additional shortwave
energy rotating along the northern periphery of the upper ridge
centered across the Desert Southwest consolidates with the previously
mentioned wave off to our northwest. This will cause the wave to
deepen and close off...with modest southerly flow allowing for some
return flow to make its way this far north. As such...precip chances
look to become more widespread Thu night/Fri as main 850-hPa closed
low passes just off to our north. Considering fairly consistent model
agreement between the ECMWF/GFS/and Canadian...have increased pops
accordingly...with the highest values (likely mention) confined
across northwestern portions of the fcst area. From this vantage
point...overall severe threat looks marginal at best as increased
cloud cover leading up to the low passing to our north will likely
hinder destabilization processes.

Beyond this...extended range models continue to advertise moderate
height rises building into the area as upper-level ridging strengthens
to our west. This should allow for a modest increase in temperatures
heading into the weekend and early next week with dry conditions


.AVIATION...(For the 18Z TAFS through 18Z Tuesday Afternoon)
Issued at 1152 AM CDT MON AUG 24 2015

VFR conditions will continue as high pressure continues to dominate
the region. Will have to monitor the potential for fog development
overnight at KSTJ, but at this point, the setup doesn`t look as
impressive as this morning due to the increased temperature and
dewpoint spreads.




AVIATION...Welsh is the U.S. government's official web portal to all federal, state and local government web resources and services.