Area Forecast Discussion
Issued by NWS Birmingham, AL

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FXUS64 KBMX 021756
AFDBMX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1256 PM CDT SUN AUG 2 2015

.UPDATE...
FOR 18Z AVIATION.

&&

.DISCUSSION...

A DECENT VARIATION IN DEWPOINTS THIS MORNING ACROSS CENTRAL
ALABAMA...LOCATIONS NEAR THE I-85 CORRIDOR ARE STILL IN THE MUGGY
70S WITH A FEW LOCATIONS IN THE NORTHEAST IN THE MUCH MORE PLEASANT
UPPER 50S. DEWPOINTS HAVE INCREASED IN A FEW LOCATIONS WITH THE
BOUNDARY LAYER DECOUPLING TONIGHT. CURRENT WATER VAPOR IMAGERY AND
RAP UPPER AIR ANALYSIS INDICATES TWO PROMINENT FEATURES...AN UPPER
LEVEL RIDGE ACROSS THE WESTERN CONUS WITH A LONGWAVE TROUGH ACROSS
EASTERN CANADA INTO THE GREAT LAKES AND NORTHEASTERN U.S. AT THE
SURFACE...THE FRONT IS NOW ALONG THE GULF COAST BUT AS MENTIONED
EARLIER...LOW LEVEL MOISTURE REMAINS IN PLACE ACROSS SOUTHEASTERN
PORTIONS OF THE AREA. LAST NIGHTS 00Z BMX SOUNDING OBSERVED 0.74
INCHES OF PW WHICH IS STILL WELL BELOW NORMAL FOR THIS TIME OF YEAR
AND EXPECT THESE CONDITIONS WILL CONTINUE OVER THE NEXT COUPLE OF
DAYS. PW VALUES WILL REMAIN MUCH BELOW NORMAL TODAY...BUT A FEW
AFTERNOON SHOWERS AND STORMS WILL BE POSSIBLE ACROSS SOUTHEASTERN
PORTIONS OF CENTRAL ALABAMA WHERE MOISTURE IS A BIT MORE ELEVATED
CLOSER TO THE FRONT.

UPPER LEVEL HEIGHTS WILL BEGIN TO INCREASE EARLY IN THE WORK WEEK
AND HIGH TEMPERATURES WILL RISE INTO THE MID TO UPPER 90S. MOISTURE
WILL RETURN TO THE AREA LATE TUESDAY INTO WEDNESDAY WITH SOUTHERLY
FLOW EXPECTED. PW VALUES WILL INCREASE INTO THE 1.5-2.0 INCH RANGE
WITH PRECIPITATION CHANCES RETURNING TO THE FORECAST ON WEDNESDAY.
TROUGHS EMBEDDED IN THE NORTHWESTERLY FLOW ALOFT WILL CONTINUE TO
DIVE FURTHER TO THE SOUTH LATE IN THE WEEK AS THE UPPER LEVEL
PATTERN BECOMES MORE AMPLIFIED. THEREFORE...HAVE INCREASED POPS IN
THE EXTENDED PORTION OF THE FORECAST AND HAVE LOWERED HIGH
TEMPERATURES DURING THIS TIME PERIOD AS WELL TO ACCOUNT FOR THE
HIGHER PRECIPITATION CHANCES.

05/MA


&&

.AVIATION...
18Z TAF DISCUSSION.

ABNORMALLY DRY SUMMER AIR MASS WILL CONTINUE TO PROVIDE
PREDOMINANTLY WIDESPREAD VFR NEXT 24 HOURS. THE ONLY EXCEPTION MAY
BE A BRIEF PERIOD OF MORNING BR TOMORROW AT TOI...WHERE MOISTURE
LEVELS ARE SOMEWHAT HIGHER. DAYTIME SURFACE WINDS ALSO
ANOMALOUSLY OUT OF THE NORTHERN HALF OF THE COMPASS WITH NEARLY
STATIONARY LOW PRESSURE JUST OFF THE FLORIDA COAST...WITH
OVERNIGHT WINDS CALM OR LIGHT AND VARIABLE NORTHERLY COMPONENT.

02

&&

.FIRE WEATHER...

DRY CONDITIONS ARE EXPECTED ACROSS MOST OF THE AREA OVER THE
WEEKEND...EXCEPT FOR A FEW SHOWERS OR STORMS ALONG AND SOUTH OF
I-85. MINIMUM RH VALUES THROUGH TUESDAY WILL BE IN THE 25-35
PERCENT RANGE BUT EXPECT WINDS WILL BE WELL BELOW CRITERIA DURING
THIS TIME.

&&

.BMX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$



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