Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 241728
AFDLSX

AREA FORECAST DISCUSSION...UPDATED AVIATION
NATIONAL WEATHER SERVICE ST LOUIS MO
1228 PM CDT Sun Aug 24 2014

.SHORT TERM: (Through Tuesday)
Issued at 219 AM CDT Sun Aug 24 2014

Changes to heat headlines this morning:

1. An expansion of the EXCESSIVE HEAT WARNING to include much of
southwest and south central Illinois and neighboring eastern
Missouri counties due to the continued pooling of middle to upper 70
dewpoints (this led to heat index values between 110 and 115 degrees
yesterday afternoon and early evening).

2. Extended all heat headlines in time through Tuesday evening as
the approach and passage of the cold front continues to be delayed,
thus prolonging the heat wave.

.LONG TERM: (Wednesday through Saturday)
Issued at 219 AM CDT Sun Aug 24 2014

Pattern finally begins to break down by the middle of the week. Both
the ECWMF and GFS depict a trof moving into the Midwest as the ridge
flattens. This will send a cold front through the area by the end of
the week, ending the heat wave and bringing a chance of showers and
thunderstorms.

CVKING

&&

.AVIATION:  (For the 18z TAFs through 18z Monday Afternoon)
Issued at 1226 PM CDT Sun Aug 24 2014

VFR through the period with southwest winds backing slightly at
night. Similar to previous nights, there could be brief periods of
light fog between 06-13z.

Kanofsky

&&

.LSX WATCHES/WARNINGS/ADVISORIES:
MO...HEAT ADVISORY until 8 PM CDT Tuesday 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 Tuesday FOR Jefferson MO-
     Lincoln MO-Pike MO-St. Charles MO-St. Louis City MO-St.
     Louis MO.

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

     EXCESSIVE HEAT WARNING until 8 PM CDT Tuesday 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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