Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 271706
AFDLSX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
1206 PM CDT Wed Aug 27 2014

.SHORT TERM:  (Through Late Tonight)
Issued at 1148 AM CDT Wed Aug 27 2014

Going forecast trends still look reasonable. Ongoing activity
over northern Missouri should continue to drift east and
weaken with time as additional storms develop and become focused
along the southward pushing outflow boundary (approximately near a
KJEF-KUIN line attm) and along ill-defined remnants of synoptic
surface front, roughly from northern Ozarks, through the STL
metro, into central IL. Since there has been very little change in
the warm, humid airmass, expect that the storms that form along
the outflow and/or frontal boundary will pose a pulse-type severe
storm threat (gusty winds and some hail)...much like what occurred
yesterday.

Truett

.LONG TERM: (Thursday through Tuesday)
Issued at 237 AM CDT Wed Aug 27 2014

Boundary will be slow to lift back north on Thursday and may become
orientated more northwest to southeast across the CWA...paralleling
the Mississippi River. Once again, afternoon convection will be
possible in the vicinity of this front.

The boundary should finally lift north as a warm front Thursday
night with dry and seasonably warm weather expected on Friday
ahead of the shortwave/cold front that approaches from the west.

Have tried to focus likely POPs Friday night and Saturday with this
next system as blended guidance seems to give too long of a period
of POPs when compared to reality. So, after a wet and cooler
beginning to the Labor Day Weekend, it appears chances of
precipitation will decrease for Sunday and Monday (Labor Day), with
temperatures beginning to inch back up above normal in the wake
of this storm system.

CVKING

&&

.AVIATION:  (For the 12z TAFs through 12z Thursday Morning)
Issued at 655 AM CDT Wed Aug 27 2014

Complex of storms continues to develop over northwestern Missouri
and track to the east. Should move into KUIN by 17z and persist
through the afternoon hours. Otherwise, trying to pin down when
storms may develop and move through other tafs sites is difficult,
so for now kept tafs dry. Light winds to pickup from the northeast
to east today as frontal boundary settles over region. Some patchy
dense fog has developed over central MO, but should lift and
dissipate by mid morning today. By tonight, front will be just
south of Interstate 70, so could see some patchy mvfr fog develop
after 06z Thursday, so added tempo mention.

Specifics for KSTL:

Complex of storms continues to develop over northwestern Missouri
and track to the east. Should move remain north of metro area.
Otherwise, trying to pin down when storms may develop and move
through metro area is difficult, so for now kept taf dry. Light
winds to pickup from the northeast to east by 18z as frontal
boundary settles over region. By tonight, front will be just
south of Interstate 70, so could see some patchy mvfr fog develop
after 08z Thursday, so added tempo mention.

Byrd

&&

.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-Madison MO-Moniteau MO-Montgomery MO-Osage MO-
     Reynolds 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-St. Charles MO-St. Louis City MO-St. Louis MO.

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-
     Randolph IL-St. Clair IL-Washington IL.

&&

$$

WFO LSX






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