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Area Forecast Discussion
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000
FXUS61 KALY 302305
AFDALY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ALBANY NY
705 PM EDT SAT AUG 30 2014

.SYNOPSIS...
A SLOW MOVING COLD FRONT WILL BRING SHOWERS AND THUNDERSTORMS
LATE TONIGHT INTO SUNDAY...SOME POSSIBLY WITH HEAVY RAINFALL. WEAK
HIGH PRESSURE WILL BUILD IN LABOR DAY. IT WILL BE VERY WARM AND
HUMID AND MAINLY RAIN-FREE...BUT AN ADDITIONAL THUNDERSTORM CANNOT
BE RULED OUT. ANOTHER COLD FRONT IS EXPECTED TO BRING A CHANCE FOR
SHOWERS AND THUNDERSTORMS TUESDAY AND TUESDAY NIGHT.

&&

.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
AS OF 704 PM...LOWER CLOUDS COVER THE SOUTHERN THIRD OF THE ALBANY
FORECAST AREA WHILE HIGHER CLOUDS APPROACH FROM THE WEST. THERE IS
A BROKEN LINE OF SHOWERS AND THUNDERSTORMS TO THE WEST THAT
EXTENDS FROM NEAR BUFFALO TO ROCHESTER AND THEN NORTHEAST ACROSS
EASTERN LAKE ONTARIO. THESE SHOWERS AND STORMS ARE ONLY VERY
SLOWLY GETTING CLOSER TO THE FAR NORTHWEST PART OF HERKIMER AND
HAMILTON COUNTIES...BUT DECIDED TO PUT SLIGHT CHANCE POPS OVER
THAT AREA FOR THIS EVENING AS LATEST HRRR AND HIRESWRF MODELS HAVE SOME
SHOWERS SCRAPE THE FAR NORTHWEST. AFTER THOSE SHOWERS GO BY TO THE
NORTH LATER THIS EVENING...MODELS INDICATE DRY CONDITIONS TILL AFTER
MIDNIGHT. LOWS TONIGHT IN THE 60S.

JUST SOME MINOR TWEAKS TO THE FIRST 12 HOURS OF THE FORECAST BASED
ON RADAR...SATELLLITE...CURRENT OBS AND LATEST RUNS OF FORECAST MODELS.

&&

.SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/...
STILL SOME QUESTION AS TO HOW MUCH CLOUD COVER WILL BE OVER THE
REGION TOMORROW. SOUTHWEST BOUNDARY LAYER FLOW AND A LOOSENING
BOUNDARY LAYER THERMAL GRADIENT SHOULD PROMOTE SOME BREAKS IN
CLOUD COVER. THERE SHOULD ALSO BE BREAKS IN THE LEFTOVER
CONVECTIVE DEBRIS FROM CONVECTION IN THE GREAT LAKES AND WESTERN
NY/PA. CLOUD COVER CURRENTLY UPSTREAM IN THE OH VALLEY AND GREAT
LAKES IS SCATTERED TO BROKEN. SO WITH THE PROSPECTS FOR AT LEAST
SOME INTERVALS OF SUN...WITH RAPIDLY WARMING BOUNDARY LAYER
TEMPERATURES...HIGHS SOLIDLY IN THE 80S SUNDAY...BUT UPPER 70S
SOUTHERN ADIRONDACKS WHERE SHOWERS AND THUNDERSTORMS SHOULD AFFECT
EARLIER IN THE DAY.

UPPER DYNAMICS...ALONG WITH A LITTLE LOW LEVEL JET SEGMENT TRACKS
THROUGH THE REGION SUNDAY AND SUNDAY NIGHT. DEEP MOISTURE SEEN IN
THE SATELLITE DERIVED SOUNDER IMAGERY OF PWAT...IS SURGING NORTH
FROM THE MS/TN VALLEY. SO...COVERAGE OF SHOWERS AND SCATTERED
THUNDERSTORMS SHOULD INCREASE TO LIKELY IN THE AFTERNOON IN MOST
AREAS. LOCALLY HEAVY RAIN IS POSSIBLE AND WILL ADDRESS IN
HAZARDOUS WEATHER OUTLOOK...BUT NO WIDESPREAD OR HIGH IMPACT FLOOD
THREAT EXPECTED.

WEAK COLD FRONT EXITS SUNDAY NIGHT WITH JUST SOME LINGERING
SCATTERED SHOWERS AND THUNDERSTORMS...WITH THE BEST COVERAGE IN
THE MID HUDSON VALLEY...BERKSHIRES AND NW CT SUNDAY EVENING. SOME
QUESTION AS TO HOW FAR SOUTH THE WEAK LOW LEVEL BOUNDARY GETS...SO
SCATTERED SHOWERS AND THUNDERSTORMS COULD LINGER THROUGH MUCH OF
MONDAY IN THE MID HUDSON VALLEY AND NW CT...BUT JUST SCATTERED...
WITH ISOLATED AFTERNOON ACTIVITY ELSEWHERE. STILL...SOME PERIODS
OF SUNSHINE EXPECTED MONDAY...WITH PERHAPS MORE CLOUDS THAN SUN IN
THE MID HUDSON VALLEY AND NW CT. HIGHS MONDAY SOLIDLY IN THE 80S.
THERE COULD BE A LULL IN THE SHOWER AND THUNDERSTORM ACTIVITY
MONDAY NIGHT WITH PARTIAL CLEARING...BUT DEW POINTS ARE NOT
EXPECTED TO DROP MUCH IF ANY...SO LOWS MONDAY NIGHT IN THE 60S.

ANOTHER COLD FRONT APPROACHES TUESDAY...WITH A BIT BETTER BOUNDARY
LAYER FRONTOGENESIS AND THERMAL GRADIENT TRACKING TOWARD THE
REGION. CURRENT CONSENSUS ON TIMING SUGGESTS SOME SUNSHINE AND
DAYTIME HEATING AT LEAST TUESDAY MORNING...WITH THE LEADING EDGE
OF SCATTERED SHOWERS AND THUNDERSTORMS APPROACHING WESTERN AREAS
MIDDAY OR EARLY AFTERNOON TUESDAY...THEN AFFECTING THE REST OF THE
REGION THROUGH THE AFTERNOON. HIGHS TUESDAY SOLIDLY IN THE 80S.
THUNDERSTORMS TUESDAY COULD BE STRONG BASED ON THE POTENTIAL
INSTABILITY...THERMAL GRADIENT FORCING AND BOUNDARY LAYER WINDS.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
MIDWEEK THROUGH THE END OF THE WORK WEEK WILL FEATURE DRY CONDITIONS 
AS HIGH PRESSURE MOVES OVER THE FORECAST AREA BEHIND A COLD FRONT.  
HOWEVER...A COLD FRONT ON SATURDAY WILL BRING A SHOWERY START FOR 
THE BEGINNING OF THE WEEKEND.

TEMPERATURES WILL AVERAGE A FEW DEGREES ABOVE NORMAL...WITH HIGHS 
FROM AROUND 70 DEGREES...TO THE LOWER AND MID 80S WEDNESDAY THROUGH 
FRIDAY.  SATURDAY WILL BE COOLER WITH HIGHS FROM THE MID 60S TO 
AROUND 809 DEGREES.

NIGHTTIME LOWS WILL BE IN THE MID 50S TO UPPER 60S RANGE JUST PRIOR 
TO THE COLD FRONT TUESDAY NIGHT.  WEDNESDAY NIGHT LOWS WILL RANGE 
FROM AROUND 50 DEGREES IN THE WESTERN ADIRONDACKS...TO NEAR 60 
DEGREES DOWN THE HUDSON VALLEY.  THEN READINGS SLOWLY BOUNCE BACK... 
WITH LOWS FROM MAINLY THE LOWER AND MID 50S IN THE MOUNTAINS...TO 
THE LOWER 60S DOWN THE HUDSON VALLEY.

&&

.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
VFR CONDITIONS PREVAILING ACROSS THE TERMINALS THIS
AFTERNOON...HOWEVER AN EXPANSIVE AREA OF STRATUS CLOUDS IS
NOTICEABLY CREEPING TOWARDS THE AREA FROM PA/NJ INTO THE CATSKILLS
OF NY...COURTESY OF LOW LEVEL MOISTURE INCREASING WITH A SOUTH TO
SOUTHWEST FLOW. FOR NOW...MOST OF THE CIGS ARE IN VFR RANGE
ALTHOUGH MVFR CIGS HAVE BEEN NOTED ACROSS SOME HIGHER TERRAIN
AREAS. WILL MENTION SCT CLOUDS EARLY WITH CIGS DEVELOPING LATER
THIS AFTERNOON OR EARLY EVENING...FROM SOUTHWEST TO NORTHEAST
ACROSS THE AREA. CIGS EXPECTED TO LOWER TO MVFR RANGE THIS
EVENING...ESPECIALLY LATER THIS EVENING AS LOW LEVEL DEWPOINTS
CONTINUE TO RISE. OVERNIGHT MAINLY MVFR CONDITIONS EXPECTED WITH
OVC CIGS AND SOME MIST. HOWEVER...THERE IS A CHANCE OF SOME
OCCASIONAL IFR AT KPSF BUT CONFIDENCE NOT GREAT ENOUGH TO MENTION
IN TAF AT THIS TIME.

CIGS WILL ONLY SLOWLY RISE ON SUNDAY...BUT SHOULD STILL GENERALLY
REMAIN IN MVFR RANGE THROUGH 18Z SUNDAY. A COLD FRONT WILL
APPROACH FROM THE WEST BRINGING A THREAT OF MAINLY AFTERNOON
CONVECTION. WILL MENTION VCSH IN KGFL/KALB TAF PRIOR TO 18Z.

WINDS WILL BE SOUTHERLY AROUND 6-12 KT WITH SOME OCCASIONAL HIGHER
GUSTS. WIND SPEEDS WILL DECREASE TO AROUND 3-8 KT AFTER DARK.
WINDS WILL GENERALLY BE SOUTH-SOUTHWEST AROUND 5-10 KT ON SUNDAY.

OUTLOOK...

SUNDAY NIGHT: MODERATE OPERATIONAL IMPACT. SCATTERED SHRA...TSRA.
LABOR DAY: LOW OPERATIONAL IMPACT. ISOLATED SHRA...TSRA.
MONDAY NIGHT: LOW OPERATIONAL IMPACT. ISOLATED SHRA...TSRA.
TUESDAY: MODERATE OPERATIONAL IMPACT. SCATTERED SHRA...TSRA.
TUESDAY NIGHT: MODERATE OPERATIONAL IMPACT. SCATTERED SHRA...TSRA.
WEDNESDAY: NO OPERATIONAL IMPACT.  NO SIG WX.
WEDNESDAY NIGHT: NO OPERATIONAL IMPACT.  NO SIG WX.
THURSDAY: NO OPERATIONAL IMPACT.  NO SIG WX.

&&

.FIRE WEATHER...
LATE TONIGHT INTO SUNDAY A SLOW MOVING COLD FRONT WILL BRING A
ROUND OF SHOWERS AND THUNDERSTORMS...SOME POSSIBLY WITH HEAVY
RAINFALL. WEAK HIGH PRESSURE WILL BUILD IN LABOR DAY. IT WILL BE
VERY WARM HUMID AND MAINLY RAIN-FREE...BUT AN ADDITIONAL
THUNDERSTORM CANNOT BE RULED OUT. ANOTHER COLD FRONT IS
EXPECTED TO BRING A CHANCE FOR SHOWERS AND THUNDERSTORMS TUESDAY
AND TUESDAY NIGHT.

MINIMUM RH VALUES SHOULD BE BETWEEN 65 TO 75 PERCENT SUNDAY ASS
COVERAGE OF SHOWERS AND THUNDERSTORMS INCREASES. MINIMUM RH VALUES
MONDAY SHOULD BE 55 TO 65 PERCENT. MAXIMUM RH VALUES TONIGHT AND
TOMORROW NIGHT ARE EXPECTED TO BE 80 TO 100 PERCENT WITH SOME DEW
FORMATION.

THE SURFACE WIND BE SOUTH TO SOUTHWEST AT 15 MPH OR LESS TONIGHT
THROUGH SUNDAY NIGHT...THEN BECOME WEST TO SOUTHWEST MONDAY.

&&

.HYDROLOGY...
SHOWERS AND THUNDERSTORMS WILL DEVELOP LATE TONIGHT AND
ESPECIALLY SUNDAY INTO SUNDAY EVENING. AVERAGE BASIN RAINFALLS
LOOK TO GENERALLY BE UNDER AN INCH SO AT THIS POINT...MAIN STREAM
RIVERS WILL GENERALLY SEE LITTLE OR NO RISES.

HOWEVER...WITH PWAT VALUES FORECAST TO INCREASE TO 2 INCHES...ANY 
THUNDERSTORM COULD CONTAIN LOCALLY HEAVY RAINFALL EASILY EXCEEDING 
AN INCH. ANY TRAINING THUNDERSTORMS COULD RESULT LOCALIZED PONDING 
OF WATER IN AREAS OF POOR DRAINAGE.

ADDITIONAL THUNDERSTORMS ON LABOR DAY LOOK ISOLATED AND GENERALLY
NOT EXPECTED TO PRODUCE ADDITIONAL HYDRO PROBLEMS.

MORE SHOWERS AND THUNDERSTORMS ARE POSSIBLE LATE TUESDAY INTO 
WEDNESDAY AS A STRONGER COLD FRONT ARRIVES.  


FOR DETAILS ON SPECIFIC AREA RIVERS AND LAKES...INCLUDING OBSERVED 
AND FORECAST RIVER STAGES AND LAKE ELEVATIONS...PLEASE VISIT THE 
ADVANCED HYDROLOGIC PREDICTION SERVICE /AHPS/ GRAPHS ON OUR WEBSITE.

&&

.ALY WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
NY...NONE.
MA...NONE.
VT...NONE.

&&

$$
SYNOPSIS...SND/NAS
NEAR TERM...SND
SHORT TERM...NAS 
LONG TERM...ELH 
AVIATION...JPV
FIRE WEATHER...NAS 
HYDROLOGY...NAS







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