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 240837

337 AM CDT Thu Jul 24 2014

.SHORT TERM:  (Through Late This Afternoon)
Issued at 333 AM CDT Thu Jul 24 2014

Surface ridge will remain overhead today with mostly sunny skies,
lower dewpts and cooler temperatures. Highs will only be in the
upper 70s to low 80s.


.LONG TERM:  (Tonight through Wednesday)
Issued at 333 AM CDT Thu Jul 24 2014

By tonight, surface ridge begins to move off to the east allowing
southerly winds and low level moisture to return once again. Models
continue to develop a complex over Iowa on nose of low level jet
with southern edge just skimming far northern portions of forecast
area after 06z Friday. Kept slight chance pops there for now.
Otherwise, dry conditions to prevail with lows in the upper 50s to
low 60s.

On Friday, complex to slide southeast across IL with northeastern
portions of forecast area on periphery of complex. Depending on
coverage of activity and cloud cover associated with it,
temperatures are hard to pin down. For now have highs ranging from
the low 80s far east to the low 90s over central MO.

By Friday night, main cold front to begin sliding southeast through
forecast area. With increasing low level jet once again and
increasing moisture, will see activity fire on nose of low level
jet along and east of Mississippi River. Will also see milder overnight
temperatures with lows only in the upper 60s to mid 70s.

Despite 850 temps between 22 and 24C, high temperature forecast will
be tricky on Saturday. With ongoing storms possible along frontal
boundary that will be moving through, could see a wide range of high
temperatures. For now kept forecast area rather warm with highs in
the low to mid 90s, and with dewpts in the low 70s, heat indicies
will approach 100 in many locations. Another issue will be the
possibility of severe weather especially Saturday afternoon and
Saturday night. High CAPES, plenty of low level moisture, and
shortwave tracking along boundary, could see complex develop and
slide east. SPC has put most of forecast area in a slight risk for
Day 3.

Frontal boundary and storms to finally exit region by late Sunday
with surface ridge building in for the first part of the work week.
Highs Monday through Wednesday will be in the upper 70s to low 80s.


.AVIATION:  (For the 06z TAFs through 06z Thursday Night)
Issued at 1132 PM CDT Wed Jul 23 2014

VFR fcst thru the prd as high pressure drifts from MN to IN allowing
for diurnal cu and a light breeze with an erly component.




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