Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 250421
AFDLSX

AREA FORECAST DISCUSSION...UPDATED AVIATION
NATIONAL WEATHER SERVICE ST LOUIS MO
1121 PM CDT MON AUG 24 2015

.UPDATE:
ISSUED AT 829 PM CDT MON AUG 24 2015

GOING FORECAST STILL LOOKS ON TRACK FOR CLEAR SKIES WITH LIGHT
WINDS OVERNIGHT AS HIGH PRESSURE CONTINUES TO BUILD INTO THE AREA.
WILL KEEP WITH GOING LOWS AS THEY ARE CLOSE TO CURRENT DEWPOINTS.

BRITT
&&

.SHORT TERM:  (THROUGH LATE TONIGHT)
ISSUED AT 330 PM CDT MON AUG 24 2015

SPRAWLING HIGH PRESSURE STRETCHING FROM OKLAHOMA UP INTO
SASKATCHEWAN WILL CONTINUE TO PUSH COOL AND DRY AIR INTO THE MID
MISSISSIPPI VALLEY AS IT BUILDS EASTWARD. THE CLEAR AND DRY AIR
SHOULD MAKE FOR EXCELLENT RADIATIONAL COOLING CONDITIONS TONIGHT
AFTER THE WINDS FALL OFF. EXPECT TEMPERATURES TO DROP OFF TO NEAR
LAST NIGHT`S LOWS...OR EVEN A FEW DEGREES COOLER.

CARNEY

.LONG TERM:  (TUESDAY THROUGH NEXT MONDAY)
ISSUED AT 330 PM CDT MON AUG 24 2015

12Z GUIDANCE MAINTAINING TREND OF CANADIAN RIDGE SLOWLY WORKING
ITS WAY ACROSS THE MISSISSIPPI VALLEY IN THE TUE-THU TIME FRAME AS
UPPER LEVEL NORTHWEST FLOW PERSISTS ACROSS THE REGION. NO REAL
CHANGES REQUIRED TO GOING FORECAST, WHICH EMPHASIZE DRY AND
TRANQUIL CONDITIONS ALONG WITH BELOW AVERAGE LATE AUGUST TEMPS.

WITH LITTLE CHANGE IN LOW LEVEL AMS, HAVE GENERALLY GONE WITH
PERSISTENCE IN TEMPS THROUGH THURSDAY WITH HIGHS MAINLY IN THE 75
TO 80 DEGREE RANGE AND LOWS IN THE 50S, WITH THE COOLEST
OVERNIGHT MINS EXPECTED IN THE LOW-LYING AREAS OF THE EASTERN
OZARKS.

MEDIUM RANGE GUIDANCE CONTINUES TO POINT TO WEAK DISTURBANCE
MIGRATING THROUGH THE RIDGING OVER THE PLAINS ON THURSDAY...AND
PUSHING INTO OUR AREA BY THE END OF THE WEEK. FORECAST WILL
CONTINUE TO INDICATE A CHANCE OF THUNDERSTORMS WITH THIS FEATURE
IN THE FRIDAY THROUGH SATURDAY NIGHT TIME FRAME.

500 HEIGHTS ARE ALSO FORECAST TO INCREASE ACROSS THE AREA WITH
TIME, WHICH SHOULD LEAD TO TEMPERATURES SLOWLY RETURNING TO MORE
TYPICAL LATE SUMMER LEVELS BY THE START OF NEXT WEEK.

TRUETT
&&

.AVIATION:  (FOR THE 06Z TAFS THROUGH 06Z TUESDAY NIGHT)
ISSUED AT 1119 PM CDT MON AUG 24 2015

WITH SURFACE RIDGE OVERHEAD, WINDS TO REMAIN LIGHT AND VARIABLE
THROUGH DAYBREAK. THEN WINDS TO PICKUP FROM THE NORTHWEST BETWEEN
10 AND 15KT BY MID MORNING, BEFORE DIMINISHING ONCE AGAIN TOWARDS
SUNSET ON TUESDAY. OTHERWISE, CLEAR AND DRY CONDITIONS EXPECTED
THROUGH THE FORECAST PERIOD.

SPECIFICS FOR KSTL:
WITH SURFACE RIDGE OVERHEAD, WINDS TO REMAIN LIGHT AND WESTERLY THROUGH
DAYBREAK. THEN WINDS TO PICKUP FROM THE NORTHWEST BETWEEN 10 AND
15KT BY 16Z TUESDAY, BEFORE DIMINISHING ONCE AGAIN TOWARDS SUNSET
ON TUESDAY. OTHERWISE, CLEAR AND DRY CONDITIONS EXPECTED THROUGH
THE FORECAST PERIOD.

BYRD
&&

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

$$
WFO LSX



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