Area Forecast Discussion
Issued by NWS St. Louis, MO

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000
FXUS63 KLSX 021314
AFDLSX

AREA FORECAST DISCUSSION...UPDATED AVIATION
NATIONAL WEATHER SERVICE ST LOUIS MO
814 AM CDT THU JUL 2 2015

.SHORT TERM: (THROUGH THIS WEEKEND)
ISSUED AT 437 AM CDT THU JUL 2 2015

A SYNOPTIC SCALE BOUNDARY WAS SINKING INTO THE NORTHEASTERN CWA
EARLY THIS MORNING AND WILL SLOSH BACK AND FORTH ACROSS THE
REGION OVER THE NEXT FEW DAYS. ALOFT, A LONGWAVE TROUGH IS
FORECAST TO REMAIN OVER THE EASTERN HALF OF THE CONUS THROUGH MOST
OF THE HOLIDAY WEEKEND, AND SEVERAL SHORTWAVES ARE EXPECTED TO
MOVE THROUGH THIS TROUGH OVER THE NEXT COUPLE OF DAYS. THESE
SHORTWAVES WILL PROVIDE LARGE SCALE ASCENT AND FORCING TO SUPPORT
SCATTERED CONVECTION, ESPECIALLY INVOF THE MEANDERING BOUNDARY.
OUTFLOW BOUNDARIES FROM EARLIER CONVECTION MAY ALSO SERVE TO FOCUS
SH/TS DEVELOPMENT OVER THE NEXT FEW DAYS.

TODAY`S HIGH TEMPERATURES IN THE 70S WILL BE ABOUT 10 DEGREES
BELOW AVERAGE, BUT TEMPERATURES SHOULD WARM BACK INTO THE 80S BY
THE WEEKEND.

KANOFSKY

.LONG TERM: (MONDAY THROUGH WEDNESDAY)
ISSUED AT 437 AM CDT THU JUL 2 2015

THE FLOW ALOFT BECOMES QUASISTATIONARY LATE THIS WEEKEND AND
EARLY NEXT WEEK. A COLD FRONT WILL APPROACH MO/IL ON MONDAY NIGHT,
EVENTUALLY MOVING INTO THE CWA ON TUESDAY. LLJ INTERACTION WITH
THE COLD FRONT ON MONDAY NIGHT SHOULD LEAD TO CONVECTIVE
DEVELOPMENT UPSTREAM. THE HIGHEST PRECIP CHANCES FOR THE LSX CWA
ARE ASSOCIATED WITH THE APPROACH AND PASSAGE OF THE COLD FRONT
BETWEEN MONDAY NIGHT AND TUESDAY NIGHT.

TEMPERATURES SHOULD BE SEASONABLY WARM IN THE LOW-MID 80S. TUESDAY
SHOULD BE SLIGHTLY COOLER DUE TO PRECIPITATION AND THE PASSAGE OF
A COLD FRONT.

KANOFSKY

&&

.AVIATION:  (FOR THE 12Z TAFS THROUGH 12Z FRIDAY MORNING)
ISSUED AT 804 AM CDT THU JUL 2 2015

SHOWERS HAVE LINGERED AT THE ST. LOUIS METRO TAF SITES THROUGH
EARLY THIS MORNING, BUT WILL SOON EXIT THE AREA. EXPECT IFR
CONDITIONS TO LINGER AT KCOU AND THE ST. LOUIS METRO TAF SITES
THROUGH LATE MORNING BEFORE IMPROVING INTO THE LOW MVFR RANGE
THROUGH EARLY AFTERNOON. THINK THAT THERE WILL BE SOME VFR
CONDITIONS LATE IN THE DAY INTO TONIGHT BEFORE MVFR CONDITIONS
RETURN LATE TONIGHT.

SPECIFICS FOR KSTL: EXPECT THE RAIN TO MOVE OUT OF THE TERMINAL BY
LATE MORNING. EXPECT THE IFR CONDITIONS TO IMPROVE TO MVFR BY
MIDDAY WITH VFR CONDITIONS BY LATE AFTERNOON. THINK THAT THERE WILL
BE SOME VFR CONDTIONS LATE IN THE DAY INTO TONIGHT BEFORE MVFR
CONDITIONS RETURN LATE TONIGHT.

BRITT

&&

.LSX WATCHES/WARNINGS/ADVISORIES:
MO...NONE.
IL...NONE.
&&

$$

WFO LSX


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