Area Forecast Discussion
Issued by NWS Memphis, TN

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FXUS64 KMEG 011734
AFDMEG

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEMPHIS TN
1234 PM CDT TUE SEP 1 2015

.UPDATE...

UPDATED FOR THE 18Z AVIATION DISCUSSION

&&

.PREV DISCUSSION... /ISSUED 1036 AM CDT TUE SEP 1 2015/

DISCUSSION...

MOSTLY SUNNY SKIES PREVAIL ACROSS THE MIDSOUTH THIS MORNING WITH
JUST SOME THIN CIRRUS PUSHING INTO THE DELTA REGION ATTM. SOME
CLOUDS ARE PUSHING NORTH INTO ARKANSAS AND MOST OF THESE SHOULD
STAY TO THE WEST THOUGH SOME MAY CREEP INTO THE DELTA OVER THE
NEXT FEW HOURS. A WEAK MID LEVEL SHEAR AXIS STRETCHES FROM NEAR
OF THE OHIO RIVER THROUGH WESTERN ARKANSAS TO A WEAK UPPER LOW
OVER EASTERN TEXAS. LATEST SHORT TERM GUIDANCE SHOWS THAT ISOLD
DEVELOPMENT SHOULD OCCUR INVOF THIS FEATURE. THIS ACTIVITY SHOULD
BE RESTRICTED TO AREAS WEST OF THE MISSISSIPPI RIVER THIS
AFTERNOON. HIGHS WILL MAINLY BE IN THE LOWER 90S.

NO CHANGES TO THE FORECAST ATTM.

SJM

PREV DISCUSSION... /ISSUED 358 AM CDT TUE SEP 1 2015/

HOT WEATHER WILL RETURN TO THE MID-SOUTH THROUGH NEXT WEEK WITH
ONLY LIMITED CHANCES FOR PRECIPITATION...

CURRENTLY...PATCHY DENSE FOG HAS DEVELOPED IN FAVORED AREAS OF
THE TENNESSEE RIVER VALLEY WITH VISIBILITIES RANGING ANYWHERE FROM
1/4SM TO 3SM AT MKL. THE FOG WILL PERSIST UNTIL SOLAR HEATING
BEGINS TO ERODE THE SURFACE INVERSION.

ON TUESDAY...THE UPPER LEVEL LOW PRESSURE/TROUGH AXIS CONTINUES TO
SHEAR OUT. WATER VAPOR IMAGERY STILL SHOWS SEVERAL SMALLER-SCALE
CIRCULATIONS WITHIN THE LARGER AREA OF LOW PRESSURE...BUT THIS
FEATURE WILL CONTINUE TO WEAKEN TODAY. AT THE SURFACE...THE
FRONTAL BOUNDARY IS ALMOST IMPOSSIBLE TO DETECT THROUGH SURFACE
OBS...BUT A DIFFUSE BOUNDARY DOES STILL EXIST. FOR THIS
REASON...ADDED A SLIGHT CHANCE OF A FEW SHOWERS OR THUNDERSTORMS
INTO THE FORECAST FOR EASTERN ARKANSAS. THESE WILL BE MORE
NUISANCE THAN ANYTHING ELSE. HIGH TEMPERATURES TODAY WILL WARMER
AS WELL...WITH AREAS ALONG THE MISSISSIPPI RIVER VALLEY REACHING
THE LOW 90S. POINTS NORTHEAST WILL BE COOLER WITH HIGHS IN THE
UPPER 80S TO NEAR 90.

THE FORECAST COMPLETELY DRIES OUT THROUGH THE MID AND EVEN LATE
PORTIONS OF THIS WEEK. ALOFT...THE UPPER LEVEL FLOW PATTERN
SIGNIFICANTLY AMPLIFIES IN RESPONSE TO STRONG TROUGHING DIGGING
INTO THE PACIFIC NORTHWEST. AN ANOMALOUSLY STRONG RIDGE DEVELOPS
WELL NORTH INTO THE HUDSON BAY REGION OF CANADA WITH THE MID-
SOUTH SQUARELY UNDER ITS INFLUENCE. THIS IS A STRONG SIGNAL FOR
ABOVE NORMAL TEMPERATURES THROUGH AT LEAST EARLY NEXT WEEK. MODELS
BEGIN TO DIVERGE ON WHEN TO BREAK DOWN THE RIDGE BY MONDAY AND
TUESDAY OF NEXT WEEK. AT PRESENT...AM LEANING TOWARD THE SOLUTION
WHICH BREAKS DOWN THE RIDGE MORE SLOWLY. MODELS HAVE BEEN DELAYING
THIS PROCESS FURTHER WITH CONSECUTIVE MODEL RUNS WHICH MAKES SENSE
GIVEN HOW STRONG THE FORECAST RIDGING WILL BE. LIMITED CHANCES FOR
PRECIP WILL EXIST THROUGH MUCH OF THIS PERIOD.

TVT

&&

.AVIATION...
18Z TAF CYCLE

VFR CONDITIONS WILL PREVAIL FOR MUCH OF THE FORECAST PERIOD. SOME
PATCHY AREAS OF FOG MAY DEVELOP OVERNIGHT OVER EASTERN SECTIONS OF
THE FORECAST AREA WHICH COULD PRODUCE MVFR VISIBILITIES. WINDS
WILL BE MAINLY FROM THE SOUTHEAST AROUND 5 KNOTS FOR MUCH OF THE
FORECAST PERIOD.

ARS

&&

.MEG WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
MO...NONE.
MS...NONE.
TN...NONE.
&&

$$



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