224  
FXUS61 KALY 060810  
AFDALY  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE ALBANY NY  
410 AM EDT TUE MAY 6 2025  
   
SYNOPSIS  
 
PERIODS OF RAIN AND SHOWERS, LOCALLY HEAVY AT TIMES,  
CONTINUE TODAY INTO TONIGHT WITH BELOW NORMAL DAYTIME HIGHS AND  
ABOVE NORMAL OVERNIGHT LOWS. THERE IS A CHANCE OF THUNDERSTORMS THIS  
AFTERNOON AND AGAIN ON WEDNESDAY. TEMPERATURES WILL BE CLOSER TO  
NORMAL ON WEDNESDAY, BUT TREND BACK BELOW NORMAL FOR THE END OF THE  
WEEK WITH ADDITIONAL CHANCES FOR RAINFALL.  
 
 
   
NEAR TERM /THROUGH TONIGHT/  
 
KEY MESSAGES:  
 
- FLOOD WATCH IN EFFECT FOR THE EASTERN CATSKILLS, MID HUDSON  
VALLEY, CENTRAL AND SOUTHERN TACONICS, BERKSHIRES AND  
LITCHFIELD HILLS THROUGH 8 PM TUESDAY.  
 
- SCATTERED SHOWERS AND THUNDERSTORMS EXPECTED TODAY. ANY STORMS  
COULD PRODUCE LOCALLY HEAVY RAIN, AND A FEW STORMS COULD BE  
SEVERE FOR AREAS FROM THE HUDSON VALLEY WESTWARDS.  
 
DISCUSSION:  
AS OF 4:10 AM EDT...CURRENT GOES 16 WV IMAGERY SHOWS OUR UPPER  
LOW NOW LOCATED OVER OHIO, AND IT IS NEARLY VERTICALLY STACKED  
WITH A COLLOCATED SURFACE LOW. WITH SURFACE HIGH PRESSURE  
CENTERED NEAR NOVA SCOTIA, THIS IS SETTING UP A LONG FETCH OF  
SOUTHERLY FLOW INTO THE NORTHEAST. THIS SOUTHERLY FLOW IS  
ADVECTING A DEEP PLUME OF MOISTURE-RICH AIR INTO THE REGION AS  
SEEN ON CIRA ALPW SATELLITE IMAGERY. UNSURPRISINGLY, THIS HAS  
RESULTED IN PERIODS OF WIDESPREAD RAIN AND SHOWERS OVERNIGHT,  
WHICH ARE CONTINUING ACROSS THE REGION AT THIS TIME. THIS BATCH  
OF SHOWERS SHOULD CONTINUE TO LIFT TO THE NORTH OVER THE NEXT  
FEW HOURS, AND SHOULD THUS TAPER OFF FOR THE CATSKILLS AND  
MOHAWK VALLEY SHORTLY. THE HEAVIEST RAIN IS FOCUSED IN  
LITCHFIELD COUNTY NEAR THE RTE 8 CORRIDOR, BUT SO FAR RAINFALL  
RATES HAVE GENERALLY REMAINED AROUND 0.25" PER HOUR OR LESS  
HERE, AND THE RAIN HERE SHOULD MOVE OFF TO THE EAST WITHIN THE  
NEXT HOUR OR TWO. WHILE SOME POOR-DRAINAGE PONDING OF WATER WILL  
BE POSSIBLE THERE THROUGH THE NEXT HOUR OR TWO, WE HAVE NOT  
SEEN ANY INDICATIONS FOR WIDESPREAD OR HIGHER-END FLOODING THAT  
WOULD NECESSITATE ADVISORY/WARNING ISSUANCE. ASIDE FROM THE  
RAIN, TEMPERATURES REMAIN MAINLY IN THE 50S, AND WILL NOT CHANGE  
MUCH BETWEEN NOW AND SUNRISE.  
 
TODAY, THE CUTOFF UPPER LOW SLIDES EASTWARDS OVER PA, EVENTUALLY  
TRACKING OVER THE SOUTHERN TIER OF NY TONIGHT. THIS SETUP WILL  
KEEP THE S/SE LLJ FOCUSED OVER EASTER NY AND WESTERN NEW  
ENGLAND. WHILE THE CORE OF THE LLJ AND THE HIGHEST PWATS SLIDE  
OFF INTO EASTERN NEW ENGLAND TODAY AS THE UPPER LOW PROGRESSES  
EASTWARDS, OUR PWATS STILL REMAIN WELL ABOVE NORMAL AT 1 - 1.25"  
FOR MOST OF TODAY. WE WILL LIKELY SEE A LULL IN SHOWER ACTIVITY  
FOR A FEW HOURS THIS MORNING AS THIS CURRENT BATCH OF SHOWERS  
MOVES OFF TO THE NORTH/EAST, BUT ADDITIONAL SHOWERS AND  
THUNDERSTORMS ARE EXPECTED TO DEVELOP BY THIS AFTERNOON. FORCING  
FOR ASCENT LOOKS IMPRESSIVE TODAY, WITH A SHORTWAVE LOBE  
ROTATING AROUND THE PERIPHERY OF THE UPPER LOW, THE APPROACHING  
RIGHT ENTRANCE OF THE UPPER JET, AND THE OCCLUDED FRONT  
ASSOCIATED WITH THE SURFACE LOW ALL PASSING OVER OUR REGION  
THIS AFTERNOON. ADDITIONALLY, THERE WILL BE MORE INSTABILITY  
COMPARED TO YESTERDAY, SO RAINFALL RATES TODAY WILL LIKELY BE  
HIGHER THAN YESTERDAY, UP TO AROUND OR POSSIBLY EVEN IN EXCESS  
OF 1" PER HOUR WITH CONVECTION.  
 
THEREFORE, THE PRIMARY THREAT TODAY WILL BE FOR LOCALLY HEAVY  
RAIN LEADING TO SOME PONDING OF WATER IN URBAN/POOR DRAINAGE  
AREAS, AND ISOLATED FLASH FLOODING. SOILS ARE ALREADY SATURATED  
FROM ALL THE RAIN WE HAVE RECEIVED OVER THE PREVIOUS DAYS.  
UNIDIRECTIONAL FLOW PROFILES INDICATE THAT THERE COULD BE SOME  
TRAINING OF CONVECTION TODAY, ALTHOUGH STORM MOTIONS SHOULD BE  
ON THE FASTER SIDE OUTSIDE OF ANY BACKBUILDING STORMS. THE  
LOCATION OF THE UPPER LOW AND MOISTURE PLUME FIT THE CONCEPTUAL  
MODEL FOR HEAVY RAIN DEVELOPED AS PART OF LOCAL CSTAR RESEARCH,  
AND WPC HAS MAINTAINED THEIR MARGINAL RISK ERO FOR TODAY ACROSS  
THE REGION. THE TIMING FOR ANY HEAVY RAIN LOOKS TO BE PRIMARILY  
THIS AFTERNOON INTO EARLY TONIGHT. MINOR FLOODING ON A FEW MAIN  
STEM RIVERS IS ALSO POSSIBLE DUE TO PERSISTENT RAINS OVER THE  
LAST FEW DAYS. PLEASE SEE THE HYDRO SECTION FOR MORE DETAILS.  
 
A SECONDARY THREAT THIS AFTERNOON/EVENING IS THAT FOR A FEW  
SEVERE STORMS. SPC HAS EXPANDED THE MARGINAL RISK OUTLOOK  
FURTHER EAST INTO THE HUDSON VALLEY, LIKELY DUE IN PART TO  
SLIGHTLY QUICKER EXPECTED FORWARD PROGRESS OF THE UPPER LOW  
COMPARED TO YESTERDAY. FALLING HEIGHTS ALOFT LEADING TO  
STEEPENING MID-LEVEL LAPSE RATES WILL BE ASSOCIATED WITH UP TO  
AROUND 1000 J/KG OF SBCAPE IN THE WESTERN MOHAWK VALLEY, AND  
AROUND 250-750 J/KG FOR MOST OF THE REST OF THE REGION WEST OF  
THE HUDSON VALLEY. THIS WILL OVERLAP WITH DEEP-LAYER BULK SHEAR  
OF 30-40 KT. HODOGRAPHS ARE FAIRLY STRAIGHT, SO WE WOULD NOT BE  
SURPRISED TO SEE SOME LOOSELY ORGANIZED CLUSTERS OF STORMS OR  
BROKEN LINE SEGMENTS THIS AFTERNOON/EVENING, ESPECIALLY FOR THE  
WESTERN HALF OF THE REGION. PRIMARY HAZARD WITH ANY STRONGER  
STORMS WILL BE DAMAGING WINDS, ALTHOUGH SOME MARGINALLY SEVERE  
HAIL CAN'T BE RULED OUT DUE TO LOW WBZ HEIGHTS BELOW 10 KFT.  
 
CONVECTION SHOULD WEAKEN EARLY TONIGHT WITH THE LOSS OF DAYTIME  
HEATING, SO BOTH THE SEVERE AND HEAVY RAINFALL THREATS WILL ALSO  
DECREASE AS WE HEAD INTO TONIGHT. THERE WILL LIKELY STILL BE  
SOME SHOWER ACTIVITY CONTINUING INTO TONIGHT, HOWEVER. TONIGHT  
ONCE AGAIN REMAINS ON THE MILD SIDE WITH LOWS IN THE 40S TO 50S  
LIKE WE HAVE HAD THE LAST FEW NIGHTS.  
 
 
   
SHORT TERM /WEDNESDAY THROUGH THURSDAY/  
 
WEDNESDAY...THE CUTOFF UPPER LOW MOVES OVERHEAD, WHILE THE  
AFOREMENTIONED SURFACE LOW TRACKS OFF TO OUR NORTH/NORTHEAST.  
THE UPPER LOW NOW LOOKS TO TRACK EASTWARDS SLIGHTLY QUICKER  
THAN PREVIOUSLY EXPECTED, SO THE CORE OF THE COLD POOL ALOFT MAY  
BE STARTING TO DEPART TO OUR EAST BY THE TIME WE GET INTO PEAK  
AFTERNOON HEATING. WHILE WE WILL STILL LIKELY SEE SOME POP-UP  
SHOWERS AND A FEW THUNDERSTORMS, ESPECIALLY NORTH AND EAST OF  
THE CAPITAL DISTRICT, INSTABILITY OVERALL LOOKS LESS IMPRESSIVE  
COMPARED TO YESTERDAY'S FORECAST. WHILE A FEW INSTANCES OF SMALL  
HAIL WILL BE POSSIBLE DUE TO THE PROXIMITY TO THE COLD POOL  
ALOFT, SEVERE WEATHER IS NOT EXPECTED (SHEAR WILL BE WEAK UNDER  
THE UPPER LOW). ADDITIONALLY, HEAVY RAIN SHOULD NOT POSE A  
THREAT EITHER, AS THE BEST MOISTURE WILL BE WELL TO OUR EAST.  
SHOWER ACTIVITY SHOULD DIMINISH HEADING INTO THE EVENING WITH  
RIDING HEIGHTS AND SUBSIDENCE ALOFT BEHIND THE DEPARTING UPPER  
LOW. HIGHS WEDNESDAY WILL BE A FEW DEGREES WARMER, MAINLY IN THE  
MID TO UPPER 60S OUTSIDE OF THE MOUNTAINS.  
 
WEDNESDAY NIGHT AND THURSDAY...THE UPPER LOW MOVES OFF INTO  
NORTHEASTERN NEW ENGLAND, AS ANOTHER UPPER TROUGH DIGS INTO THE  
GREAT LAKES REGION. THIS WILL HELP TO PUSH A COLD FRONT THROUGH  
OUR REGION WEDNESDAY NIGHT, AND THE COLD FRONT SETTLES NEAR THE  
I-84 CORRIDOR THURSDAY AFTERNOON. WHILE A FEW LIGHT SHOWERS WILL  
BE POSSIBLE WITH THE COLD FRONTAL PASSAGE, MOST OF WEDNESDAY  
NIGHT LOOKS DRY. THERE COULD BE A FEW MORE SHOWERS FOR SOUTHERN  
AREAS THURSDAY, ESPECIALLY IN THE AFTERNOON, IF THE UPPER TROUGH  
PHASES WITH AN UPPER SHORTWAVE TRACKING INTO THE OHIO VALLEY  
(SEE LONG TERM SECTION BELOW FOR MORE DETAILS). WEDNESDAY NIGHT  
LOWS WILL BE A FEW DEGREES COOLER THAN PREVIOUS NIGHTS. HIGHS  
THURSDAY WILL RANGE FROM THE UPPER 50S IN THE ADKS TO LOW 70S  
AHEAD OF THE FRONT FOR AREAS NEAR THE I-84 CORRIDOR.  
 
 
   
LONG TERM /THURSDAY NIGHT THROUGH MONDAY/  
 
KEY MESSAGE:  
 
- HIGH CHANCE TO LIKELY PROBABILITIES (50-70%) FOR A  
WIDESPREAD RAINFALL THU NIGHT THROUGH FRI AND BELOW NORMAL TEMPS  
LATE IN THE WEEK INTO THE UPCOMING WEEKEND.  
 
DISCUSSION:  
 
THE MEDIUM RANGE DETERMINISTIC AND ENSEMBLE GUIDANCE CONTINUES TO  
SHOW GOOD CONSISTENCY FOR CLOUDS TO INCREASE AHEAD OF POSITIVELY  
TILTED MID AND UPPER LEVEL TROUGH THAT APPROACHES FROM THE GREAT  
LAKES REGION AND SOUTHEAST CANADA THU NIGHT INTO FRI. LOW PRESSURE  
FORMS OVER THE MID ATLANTIC STATES AND PERIODS OF RAIN DEVELOP AHEAD  
OF THE WAVE AND WARM FRONT FRI MORNING, AND THEN MAY EXTEND INTO FRI  
NIGHT/SAT MORNING. THE MID AND UPPER LEVEL LOW MAY CUT-OFF OVER NY  
AND PA AND THEN LIFT THROUGH QUICKLY BY THE BEGINNING OF THE  
WEEKEND. NBM 24-HR PROBABILITIES BY 00Z/8 PM SAT FOR >0.25" RAIN  
ACROSS THE FORECAST AREA ARE IN THE 50-75% RANGE. NBM PROBS FOR  
>0.50" OF RAIN HAVE RISEN TO 30-50% FOR THE SAME TIME FRAME. THE  
PERIODS OF RAIN COULD BE MODERATE TO HEAVY AND WITH SOGGY AND  
SATURATED CONDITIONS AHEAD OF THIS SYSTEM, THEN SOME HYDRO ISSUES  
(POSSIBLY FLOODING) MAY ARISE. RIGHT NOW, LOCATIONS SOUTH AND EAST  
OF THE CAPITAL REGION MAY HAVE THE GREATEST THREAT FOR RAIN TOTALS  
APPROACHING AN INCH OR MORE. LOWS THU NIGHT WILL RANGE FROM  
MID/UPPER 30S OVER THE SOUTHERN DACKS AND SOUTHERN GREENS TO LOWER  
OR MID 40S OVER THE REST OF THE FORECAST AREA. IN THE RAIN COOLED  
AIR MASS, BELOW NORMAL TEMPS ARE EXPECTED FRI IN THE UPPER 40S TO  
MID AND UPPER 50S. AS THE CLOSED LOW PULLS AWAY FRI NIGHT LOWS MAY  
FALL BACK INTO THE MID 30S TO MID 40S WITH SCATTERED SHOWERS ENDING.  
 
SOME ISOLATED TO WIDELY SCATTERED SHOWERS MAY LINGER DUE TO THE  
CYCLONIC VORTICITY ADVECTION ASSOCIATED WITH THE CLOSED/CUT-OFF LOW  
TO OPEN THE WEEKEND. THE OCCLUDED CYCLONE MOVES TOWARDS THE GULF OF  
MAINE IN THE AFTERNOON. TEMPS MODERATE CLOSER TO NORMAL WITH MID  
60S TO NEAR 70F IN THE VALLEYS AND UPPER 50S TO MID 60S OVER THE  
HIGHER TERRAIN. DRIER WEATHER RETURNS SAT NIGHT WITH CLEARING SKIES  
AND COOL TEMPS IN THE UPPER 30S TO MID 40S. HIGH PRESSURE BUILDS IN  
WITH FAIR, SEASONABLE AND DRY WEATHER FOR MOTHERS DAY WITH MOSTLY  
SUNNY SKIES AND BREEZY CONDITIONS. THE SFC ANTICYCLONE SHIFTS  
OFFSHORE EARLY NEXT WEEK WITH A RETURN FLOW OF MILDER AIR, AS TEMPS  
RISE BACK ABOVE NORMAL TO OPEN THE WEEK.  
 
 
   
AVIATION /08Z TUESDAY THROUGH SATURDAY/  
 
THROUGH 06Z/WED...OCCASIONAL RAIN CONTINUES THIS MORNING FOR  
KGFL/KALB/KPOU/KPSF WITH BANDS ASSOCIATED WITH THE CLOSED LOW  
APPROACHING FROM THE WEST. VFR CONDITIONS SHOULD LOWER TO MVFR  
AT KGFL OVER THE NEXT FEW HOURS, AS THE RAIN EXPANDS NORTHWARD.  
MVFR VSBYS/CIGS CONTINUE AT KALB/KPOU WITH MAINLY LIGHT RAIN.  
KPSF CONTINUES AT IFR CIGS AND MAY SEE VSBYS LOWER FROM MVFR/VFR  
TO IFR LEVELS OVER THE NEXT COUPLE OF HOURS. WIDESPREAD MVFR  
CONDITIONS WITH INTERMITTENT IFR LEVELS ESPECIALLY WITH CIGS AT  
KPSF UNTIL 12Z-15Z/TUE, AS A BRIEF LULL OCCUR WITH THE SHOWERS  
OCCURS WITH CIGS/VSBYS RETURNING TO MVFR/VFR. PROB30 GROUPS FOR  
TSRA GROUPS WERE USED BETWEEN 16Z-20Z/TUE AT KPOU FIRST, AND  
THEN 18Z TO 00Z EXPANDING NORTHWARD FOR KALB/KPSF/KGFL WITH  
ANOTHER SURGE OF ATLANTIC MOISTURE WITH SHORT-WAVE ENERGY  
ROTATING AROUND THE CLOSED LOW. SOME REDUCTIONS FROM VFR/MVFR  
LEVELS WIT IFR LEVELS MAY OCCUR WITH ANY EMBEDDED THUNDERSTORMS.  
THE LIGHT SHOWERS CONTINUE INTO THE EARLY EVENING WITH  
WIDESPREAD MVFR/LOW VFR CONDITIONS.  
 
WIND WILL BE NORTHWEST TO NORTHEAST EARLY THIS MORNING AT LESS  
THAT 10 KT. THE WINDS BECOME EAST TO SOUTHEAST AT 5-10 KT WITH A  
FEW GUSTS TO 15-20 KT AT KALB IN THE LATE MORNING INTO THE  
AFTERNOON. LLWS CONTINUES PRIOR 12Z/TUE AT ALL THE TAF AS A  
LOW-LEVEL JET BRINGS 2 KFT WINDS BETWEEN 35-45 KT WITH SFC  
WINDS GENERALLY UNDER 10 KT.  
 
OUTLOOK...  
 
WEDNESDAY NIGHT: LOW OPERATIONAL IMPACT. NO SIG WX.  
THURSDAY: LOW OPERATIONAL IMPACT. NO SIG WX.  
THURSDAY NIGHT: MODERATE OPERATIONAL IMPACT. CHANCE OF SHRA.  
FRIDAY: MODERATE OPERATIONAL IMPACT. LIKELY SHRA.  
FRIDAY NIGHT: MODERATE OPERATIONAL IMPACT. CHANCE OF SHRA...TSRA.  
SATURDAY: LOW OPERATIONAL IMPACT. BREEZY. SLIGHT CHANCE OF SHRA.  
SATURDAY NIGHT: NO OPERATIONAL IMPACT. NO SIG WX.  
SUNDAY: NO OPERATIONAL IMPACT. NO SIG WX.  
 
 
   
HYDROLOGY  
 
FLOOD WATCH IN EFFECT FOR THE EASTERN CATSKILLS, MID HUDSON  
VALLEY, CENTRAL AND SOUTHERN TACONICS, BERKSHIRES AND LITCHFIELD  
HILLS THROUGH 8 PM THIS EVENING.  
 
PERIODS OF RAIN CONTINUE THROUGH TODAY, WITH LOCALLY HEAVY RAIN  
EXPECTED, ESPECIALLY THIS AFTERNOON AND EARLY EVENING. WHERE  
HEAVY RAIN CAN REPEATEDLY MOVE OVER THE SAME AREAS, SOME  
FLOODING OF URBAN, LOW-LYING AND POOR DRAINAGE AREAS IS  
EXPECTED. EVEN ISOLATED FLASH FLOODING MAY OCCUR WHERE THE  
HEAVIEST RAIN FALLS, ESPECIALLY IF IT OCCURS OVER THE MORE  
SUSCEPTIBLE URBAN AREAS. WPC CONTINUES TO HAVE A MARGINAL RISK  
FOR EXCESSIVE RAINFALL ACROSS THE REGION TODAY.  
 
ADDITIONAL RAINFALL AMOUNTS TONIGHT THROUGH TONIGHT RANGING  
BETWEEN 1 AND 3 INCHES (WITH THE HIGHEST AMOUNTS IN THE EASTERN  
CATSKILLS DUE TO UPSLOPE ENHANCEMENT), COMBINED WITH ALREADY  
SATURATED GROUND HAS INCREASED THE RISK OF FLASH FLOODING IN THE  
WATCH AREA.  
 
THE HOUSATONIC AT STEVENSON DAM AND THE STILL RIVER AT  
BROOKFIELD HAVE HIT MINOR FLOOD STAGE DUE TO THE RAIN OVERNIGHT.  
LATEST ENSEMBLE RIVER FORECASTS INDICATE LOW TO MEDIUM  
PROBABILITIES (~10-30%) FOR SOME ADDITIONAL POINTS TO REACH  
MINOR FLOOD STAGE, MOST NOTABLY ALONG THE HOUSATONIC RIVER,  
ESOPUS CREEK, WEST CANADA CREEK, HOOSIC RIVER, SCHOHARIE CREEK,  
AND ON THE WALLOOMSAC.  
 
 
   
ALY WATCHES/WARNINGS/ADVISORIES  
 
CT...FLOOD WATCH THROUGH THIS EVENING FOR CTZ001-013.  
NY...FLOOD WATCH THROUGH THIS EVENING FOR NYZ058>061-063>066.  
MA...FLOOD WATCH THROUGH THIS EVENING FOR MAZ001-025.  
VT...NONE.  
 
 
 
 
 
SYNOPSIS...MAIN/JPV  
NEAR TERM...MAIN  
SHORT TERM...MAIN  
LONG TERM...WASULA  
AVIATION...WASULA  
HYDROLOGY...MAIN/JPV  
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