Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 311134

634 AM CDT Thu Jul 31 2014

.SHORT TERM:  (Through Tonight)
Issued at 307 AM CDT Thu Jul 31 2014

Expect highs in the upper 70s to mid 80s followed by overnight
lows in the lower 60s. Such temperatures are 3-10 degrees below
average for this time of year. Light rain is possible across the
extreme southern CWA today on the northern fringes of an area of
precipitation which is being generated by a shortwave moving from
OK into AR. Isolated to scattered precip is also possible late
this afternoon and early tonight across the northern CWA ahead of
an approaching shortwave which is diving south-southeastward from
ND/MN per 06z water vapor imagery.


.LONG TERM:  (Tomorrow through Wednesday)
Issued at 307 AM CDT Thu Jul 31 2014

Diurnal instability combined with lift ahead of occasional weak
shortwaves might produce iso-sct SH/TS over the next couple of
days, especially during the afternoon hours. Slightly cooler than
average temperatures will continue until the northwest flow
pattern aloft begins to change over the weekend, eventually
becoming quasizonal. After an upper ridge de-amplifies and shifts
into the plains early next week while surface winds turn
southerly, seasonable levels of heat/humidity should return to the
region. The next opportunity for widespread rainfall appears to be
associated with a potential synoptic scale system during the
middle of next week.



.AVIATION:  (For the 12z TAFs through 12z Friday Morning)
Issued at 629 AM CDT Thu Jul 31 2014

Ongoing radiational fog should dissipate by 13-14z with VFR flight
conditions expected to dominate through the remainder of the day
and evening. Clouds will consist primarily of diurnal cu and some
high clouds. Given the persistence of light winds, during the
overnight hours we should see radiational fog once again develop.

Specifics for KSTL:

VFR flight conditions expected to dominate through the forecast
period. The wind will be light and clouds will consist primarily
of diurnal cu and some high clouds.





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