Area Forecast Discussion
Issued by NWS St. Louis, MO

Home | Current Version | Previous Version | Text Only | 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 KLSX 041220

720 AM CDT FRI SEP 4 2015

.SHORT TERM:  (Through Late This Afternoon)
Issued at 327 AM CDT Fri Sep 4 2015

Expect another very warm and dry day as 850mb temperatures are
expected stay near +20C favoring highs in the lower-mid 90s like
the past few days. Went with highs closer to the warmer GFS MOS
which is closer to mixing down the warmer temperatures. Kept the
forecast dry as the upper ridge will be building over us. However
can`t totally rule out an isolated thunderstorm this afternoon as
the atmosphere will become moderately unstable with little CINH.


.LONG TERM:  (Tonight through Thursday)
Issued at 327 AM CDT Fri Sep 4 2015

Still expect a dry and very warm weekend as both the GFS and NAM
continue to show the upper level ridge staying over the region on
Saturday and Sunday. Will keep with similar highs on Saturday and
Sunday as thermal fields will be the same in the lower atmosphere
with southerly winds.

Showers and thunderstorms will begin to increase over the area by
Sunday night as a cold front approaches the area from the
northwest. This front will not actually move through the area
until Wednesday when a shortwave trough will move across the area.
As a result...there will be a chance of showers and thunderstorms
along the the slow moving front from Monday until the front exits
the area late on Wednesday. Cooler air will move into the area
beginning on Wednesday.



.AVIATION:  (For the 12z TAFs through 12z Saturday Morning)
Issued at 658 AM CDT Fri Sep 4 2015

VFR flight conditions and light southerly flow will prevail
through Saturday morning. Expect river valley fog to dissipate
over the next hour or so with no visibility restrictions expected
after 13-14Z.

Specifics for KSTL:

VFR flight conditions are expected to continue with light
southerly flow.





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