Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 261154
AFDLSX

AREA FORECAST DISCUSSION...UPDATED AVIATION
NATIONAL WEATHER SERVICE ST LOUIS MO
654 AM CDT Tue Aug 26 2014

.SHORT TERM:  (Through Late This Afternoon)
Issued at 323 AM CDT Tue Aug 26 2014

Frontal boundary beginning to make its way south towards forecast
area today. Main issues today will be cloud cover, precipitation
and how this affects temperatures/heat indices. For now feel that
activity will be isolated/scattered in nature today, especially
during the afternoon hours. So there should be enough sunshine for
temperatures to rise into the mid to upper 90s once again, with
low 90s in the far north closer to the boundary. Even though
frontal boundary to eventually wash out along I-70 corridor late
this afternoon, dewpts to pool along this boundary keeping heat
indices in the 100 to 110 degree range, so headlines to remain
through 01z Wednesday.

Byrd

.LONG TERM:  (Tonight through Monday)
Issued at 323 AM CDT Tue Aug 26 2014

Some question tonight on low temperatures. Guidance is a bit too low
so went a few degrees above for overnight lows as dewpts remain in
the low 70s most locations. Keep pops going everywhere early this
evening as diurnal activity to linger a bit past 00z Wednesday, then
activity refocuses back to the north on nose of LLJ later tonight.

Will see a series of shortwaves slide east northeast through
region Wednesday through Friday, with best chances of storms over
northern half of cwa through Friday. Highs on Wednesday will be in
the upper 80s to mid 90s, so could see heat indices near 100 once
again. So depending on cloud cover, precipitation and dewpts, may
have to extend heat headlines a bit longer, but will leave as is
for now.

Then main weather system to slide through region beginning Friday
night with best chances of rain Saturday and Saturday night.

Temperatures to slowly lower through the rest of the forecast
period, eventually highs will only be in the 80s by the weekend and
into early next week.

Byrd

&&

.AVIATION:  (For the 12z TAFs through 12z Wednesday Morning)
Issued at 652 AM CDT Tue Aug 26 2014

Area still under the influence of upper level high pressure today,
which should limit convection coverage to isolated at best despite
a slowly advancing cold front from the northwest. Light south wind
will become light and variable near the front and easterly in its
wake. Generally expect VFR conditions for the next 24 hours.

Specifics for KSTL:

VFR conditions expected with light south wind.

CVKING

&&

.LSX WATCHES/WARNINGS/ADVISORIES:
MO...HEAT ADVISORY until 8 PM CDT this evening FOR Audrain MO-Boone
     MO-Callaway MO-Cole MO-Crawford MO-Franklin MO-Gasconade MO-
     Iron MO-Knox MO-Lewis MO-Madison MO-Marion MO-Moniteau MO-
     Monroe MO-Montgomery MO-Osage MO-Ralls MO-Reynolds MO-
     Shelby MO-St. Francois MO-Ste. Genevieve MO-Warren MO-
     Washington MO.

     EXCESSIVE HEAT WARNING until 8 PM CDT this evening FOR Jefferson
     MO-Lincoln MO-Pike MO-St. Charles MO-St. Louis City MO-St.
     Louis MO.

IL...HEAT ADVISORY until 8 PM CDT this evening FOR Adams IL-Brown IL.

     EXCESSIVE HEAT WARNING until 8 PM CDT this evening FOR Bond IL-
     Calhoun IL-Clinton IL-Fayette IL-Greene IL-Jersey IL-
     Macoupin IL-Madison IL-Marion IL-Monroe IL-Montgomery IL-
     Pike IL-Randolph IL-St. Clair IL-Washington IL.

&&

$$

WFO LSX





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