Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 300444

1144 PM CDT Tue Jul 29 2014

.SHORT TERM:  (Through Late Tonight)
Issued at 323 PM CDT Tue Jul 29 2014

Hi pressure continues to dominate our weather.  Expect diurnal
cumulus field to dissipate quickly this evening and the sky should
remain mostly clear this evening.  With light wind and low relative
humidity, expect excellent radiational cooling.  MOS temps look
agreeable so have followed closely.


.LONG TERM:  (Wednesday through Next Tuesday)
Issued at 323 PM CDT Tue Jul 29 2014

Unseasonably amplified trough across the eastern two-thirds of the
CONUS will continue to bring cool...and for the most part dry weather
through the next seven days. Timing subtle/nearly indistinguishable
ripples embedded within northwest flow aloft is very difficult but
cannot rule out some isolated showers/weak storms diurnally driven
through Saturday. Best "chance" may come on Friday/Saturday due to
slightly better instability as mid/upper level
heights/temperatures fall.

Longwave pattern will finally begin to breakdown late this weekend
and into early next week as combination of tropical energy in the
Atlantic and sharp trough crossing south of Hudson Bay act to
significantly dampen Bermuda high. Upper-level heights and
low-level temperatures will rise across the mid-Mississippi
Valley with a corresponding climb up to more seasonal temperatures/
humidity levels.



.AVIATION:  (For the 06z TAFs through 06z Wednesday Night)
Issued at 1143 PM CDT Tue Jul 29 2014

Expect river fog to develop like last night that will affect KSUS.
Went ahead added IFR conditions between 10-13Z as current dewpoint
depressions are already close to what they were at this time last
night. Currently have worst conditions in a tempo group with 1/2SM
in fog, though it is possible like last night they could fall
briefly below airport minimums. Otherwise, expect mainly dry and
VFR conditions with light and variable winds.

Specifics for KSTL: Expect dry and VFR conditions with mainly
light variable wind over the next 30 hours.





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