Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 240738
AFDLSX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
238 AM 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 06z TAFs through 06z Sunday Night)
Issued at 1147 PM CDT Sat Aug 23 2014

Expect VFR flight conditions to continue to prevail for the rest
of the night, with possibly a few localized spots dropping into
MVFR before sunrise in light fog. Wind should come around to the
west-southwest after 12-14Z Sunday with little or no chance for
rain. VFR flight conditions will continue to prevail Sunday.

Specifics for KSTL:

Expect VFR flight conditions to continue to prevail for the rest
of the night and through Sunday. Expect wind to veer to the west-
southwest after 12Z Sunday morning and continuing from that
direction through the afternoon. Wind will back to the southeast
by 00Z Monday.

Carney

&&

.CLIMATE:
Issued at 219 AM CDT Sun Aug 24 2014

New record high minimum temperature set at St. Louis for August
23. The low temperature of 80 degrees yesterday was the warmest
low temperature ever recorded for the date. The previous record
was 79 degrees set in 2007.

&&

.PRELIMINARY POINT TEMPS/POPS:
Saint Louis     99  78  99  78 /  10   5  10  10
Quincy          95  75  94  74 /   5  10  10  10
Columbia        98  74  98  74 /   5   0   5  10
Jefferson City  99  73  98  74 /   5   0   5  10
Salem           94  74  94  73 /  20  10  10  10
Farmington      98  74  96  74 /   5   5  10  10

&&

.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-Jefferson MO-Knox MO-Lewis MO-Lincoln MO-Madison MO-
     Marion MO-Moniteau MO-Monroe MO-Montgomery MO-Osage MO-Pike
     MO-Ralls MO-Reynolds MO-Shelby MO-St. Charles 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-Bond IL-Brown
     IL-Calhoun IL-Clinton IL-Fayette IL-Greene IL-Jersey IL-
     Macoupin IL-Marion IL-Monroe IL-Montgomery IL-Pike IL-
     Randolph IL-Washington 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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