490
FXUS61 KBGM 202003
AFDBGM
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BINGHAMTON NY
303 PM EST WED NOV 20 2024
SYNOPSIS
PATTERN BECOMES MORE ACTIVE AS A STRONG LOW PRESSURE SYSTEM
APPROACHES OUR REGION. THIS SYSTEM WILL BRING MUCH NEEDED RAIN TO
THE REGION TONIGHT WITH AN ELEVATION DEPENDENT SNOW STORM THURSDAY
NIGHT. LOW PRESSURE SYSTEM WILL CONTINUE TO KEEP SHOWERS IN THE
FORECAST THROUGH THE WEEKEND.
NEAR TERM /UNTIL 6 AM THURSDAY MORNING/
300 PM UPDATE...
QUIET CONDITIONS CONTINUE THIS AFTERNOON AND EARLY EVENING
AHEAD OF THE WELL ANTICIPATED LOW PRESSURE SYSTEM. SOUTHEAST
FLOW HAS KEPT TEMPERATURES WARM WITH HIGHS IN THE MID TO UPPER
50S. TEMPERATURE ARE EXPECTED TO GRADUALLY FALL THIS EVENING AS
A FRONTAL BOUNDARY PUSHES INTO OUR AREA FROM THE WEST. AS A
RESULT SHOWERS ALSO START TO MOVE INTO THE REGION ALONG SIDE THE
FRONT. TEMPERATURES WILL STAY WARM ENOUGH WITH OVERNIGHT LOWS
RANGING IN LOW TO MID 30S. THIS WILL KEEP RAIN IN THE FORECAST
FOR MOST OF THE NIGHT, BUT AS COOLER AIR MOVES INTO THE REGION
BEHIND THE FRONT, CONDITIONS COULD BE COOL ENOUGH FOR SNOW TO
BEGIN TO MIX INTO SOME OF THE HIGHER ELEVATIONS. NOT EXPECTING
MUCH IN TERMS OF ACCUMULATIONS AS THE SURFACE SHOULD REMAIN WARM
DURING THIS PERIOD.
SHORT TERM /6 AM THURSDAY MORNING THROUGH FRIDAY NIGHT/
300 PM UPDATE...
***POTENTIALLY HIGH IMPACT WINTER STORM LATE THU INTO FRI***
A DEEPENING STACKED LOW PRESSURE SYSTEM WILL MOVE FROM THE
SOUTHERN GREAT LAKES INTO THE NORTHERN MID ATLANTIC REGION
THURSDAY INTO FRIDAY. THIS STRONG SYSTEM WILL PRODUCE HIGH
LIQUID-CONTENT SNOW, HEAVY SNOWFALL RATES ACROSS THE REGION, AND
GUSTY WINDS.
THE IMPACTS OF THIS SYSTEM COULD BE SIGNIFICANT. THE WET SNOW
COMBINED WITH HEAVY RATES AND GUSTY WINDS COULD POTENTIALLY LEAD
TO DOWNED TREES/BRANCHES AND POWERLINES. THE SNOW, MIXED WITH
RAIN COULD MAKE FOR SLUSHY ROADS IN SOME SPOTS AND HAZARDOUS
TRAVEL CONDITIONS. THE SNOW WILL ALSO BE VERY DIFFICULT TO
SHOVEL.
THIS IS A VERY CHALLENGING FORECAST AS THE LOW PRESSURE SYSTEM
DOES NOT TAKE A WELL-DEFINED TRACK, WITH POTENTIALLY VARIOUS
WOBBLES IN DIRECTION AS IT MOVES THROUGH THE NORTHEAST US. THE
LOW IS EXPECTED TO DEEPEN, WHICH WILL LEAD TO RAPID COOLING OF
THE COLUMN. HOWEVER, THE AMOUNT OF DEEPENING OF THE LOW IS STILL
UNCERTAIN, WHICH IS LEADING TO QUITE A BIT OF UNCERTAINTY WITH
RESPECT TO THE AMOUNT OF SNOW. IF THE LOW DOESN'T DEEPEN AS MUCH
AS EXPECTED, THE THERMAL PROFILES WILL BE WARMER, WHICH WILL
LEAD TO LESS SNOW AND MORE RAIN.
BROAD SNOWFALL AMOUNTS WILL RANGE FROM 1 TO 3 INCHES IN THE
VALLEY LOCATIONS, AND 6 TO 10 INCHES IN THE HIGHER ELEVATIONS OF
THE CATSKILLS, NORTHEAST PA AND STEUBEN COUNTY. IF THE LOW
DEEPENS EVEN MORE, SNOWFALL AMOUNTS WILL BE HIGHER. THERE IS
ALSO THE POTENTIAL FOR SOME ENHANCED BANDED SNOWFALL DUE TO THE
PRESENCE OF A LAYER OF LOW/MID LEVEL F-GEN ROTATING AROUND THE
DEEPENING SURFACE LOW. WE ARE STILL UNCERTAIN WHERE THIS F-GEN
BAND WILL SET UP, BUT IT WILL LIKELY LEAD TO SNOWFALL RATES OF 1
TO 2 INCHES PER HOUR WHEN IT DOES INTENSIFY AND MOVE THROUGH.
THERE IS ALSO THE POTENTIAL FOR GUSTY WINDS AS THE LOW DEEPENS.
SUSTAINED WINDS...VARIABLE IN NATURE...WILL RANGE FROM 10 TO 15
MPH WITH GUSTS TO 20 MPH IN MOST AREAS...UP TO 30 MPH ALONG THE
RIDGE TOPS AND IN THE HIGHER ELEVATIONS.
WE ARE STILL UNCERTAIN ABOUT THE ELEVATIONS OF THE CHANGE TO
RAIN VS. SNOW, BUT WE SHOULD BE ABLE TO HAVE MORE CONFIDENCE IN
THIS AS WE GET CLOSER TO THE EVENT.
THE LOW WILL EXIT TO THE EAST ON FRIDAY AS SOME COLDER AIR
TRIES TO MOVE IN FROM THE NORTH. THIS WILL INTERACT WITH THE
WARM WATERS OF LAKE ONTARIO AND TRIGGER SOME LAKE
ENHANCED/EFFECT SNOW INTO WRN/CENTRAL NY. THERE DOESN'T APPEAR
TO BE A STRONG SIGNAL FOR SIGNIFICANT SNOW ACCUMULATION LATER
FRIDAY AND FRI NIGHT.
LONG TERM /SATURDAY THROUGH WEDNESDAY/
235 PM UPDATE
AN UPPER LEVEL TROUGH WILL BE IN PLACE OVER THE AREA ON
SATURDAY,WITH A SEASONABLY COLD NORTHWEST FLOW PATTERN IN THE
FORECAST. THIS FLOW WILL ALLOW FOR LAKE EFFECT AND ENHANCED RAIN
SHOWERS THROUGH THE DAY, MAINLY FOR CENTRAL NY NORTH OF
BINGHAMTON...HOWEVER THE REST OF THE AREA WILL REMAIN MOSTLY CLOUDY
AND COOL WITH BREEZY NW WINDS (10-20 MPH). THE NW FLOW PATTERN WITH
LAKE EFFECT SHOWERS CONTINUES SATURDAY NIGHT INTO SUNDAY AS WELL,
WITH 850MB TEMPERATURES DROPPING TO AROUND -6C. SURFACE TEMPERATURES
WILL BE MARGINAL AND SOME WET SNOW FLAKES COULD CERTAINLY MIX IN AT
TIMES (ESPECIALLY OVERNIGHT INTO SUNDAY MORNING). THE LAKE EFFECT
SHOWERS DO BEGIN TO TAPER OFF AND END LATER IN THE DAY. HIGHS OVER
THE WEEKEND ARE FORECAST TO BE IN THE 40S, WITH OVERNIGHT LOWS IN
THE 30S. SOME TRANSIENT UPPER LEVEL RIDGING MOVES OVER THE AREA
SUNDAY NIGHT INTO MONDAY, BRINGING A BRIEF PERIOD OF DRIER WEATHER.
THE NEXT SYSTEM MOVES IN LATER MONDAY BRINGING SOME RAIN SHOWERS
THEN COLDER AIR BEHIND IT. 850MB TEMPERATURES FALL BACK TOWARD -5 TO
-8C FOR THE MIDDLE OF NEXT WEEK WHICH MAY BRING ADDITIONAL LAKE
EFFECT RAIN AND SNOW SHOWERS IN THE NW FLOW PATTERN. THIS CONTINUES
THROUGH ABOUT WEDNESDAY BEFORE ANOTHER BRIEF BREAK IN THE WEATHER
ARRIVES. TEMPERATURES ARE MILD ON MONDAY WELL INTO THE 40S AND EVEN
LOWER 50S FOR HIGHS. IT COOLS BACK DOWN INTO THE 40S ON TUESDAY,
THEN MID-30S TO LOWER 40S BY NEXT WEDNESDAY. OVERNIGHT LOWS WILL BE
IN THE 30S, AND SOME 20S BY TUESDAY NIGHT. OVERALL FAIRLY SEASONABLE
TEMPERATURES.
AVIATION /18Z WEDNESDAY THROUGH MONDAY/
PERSISTENT IFR CONDITIONS AT BGM ARE EXPECTED TO IMPROVE TO MVFR
WITHIN THE NEXT FEW HOURS. OTHERWISE MVFR CONDITIONS CONTINUE TO
SURROUND THE AREA, AS A WARM FRONT MOVES ACROSS THE AREA. A FEW
SITES ARE BRIEFLY EXPECTED TO IMPROVE TO VFR THIS AFTERNOON
BEFORE SETTLING BACK INTO MVFR.
RAIN MOVES INTO THE REGION THIS EVENING AS A COLD FRONT PUSHES
THROUGH. CONDITIONS ARE EXPECTED TO DROP TO IFR AT BGM, ITH,
SYR, RME BETWEEN 5-9Z. CONFIDENCE IS NOT HIGH ENOUGH FOR IFR AT
AVP AND ELM AT THIS TIME GIVEN THE CURRENT PREVAILING WIND
DIRECTIONS DO NOT USUALLY SUPPORT IFR, BUT IT IS DEFINITELY A
POSSIBILITY AND WILL BE MONITORED.
OUTLOOK...
THURSDAY THROUGH FRIDAY...RESTRICTIONS LIKELY WITH WIDESPREAD
RAIN SHOWERS. RAIN MAY BECOME A WINTRY MIX OR JUST SNOW DURING
OVERNIGHT HOURS.
SATURDAY...CONTINUED POSSIBLE RESTRICTIONS IN RAIN AND SNOW
SHOWERS, ESPECIALLY CENTRAL NY.
SUNDAY...GRADUAL IMPROVEMENT. VFR PROBABLE FOR AVP WITH MVFR
EXPECTED ELSEWHERE. MIXED RAIN/SNOW SHOWERS FAR NORTHERN AREAS.
MONDAY... ANOTHER APPROACHING LOW PRESSURE SYSTEM COULD BRING
POSSIBLE RESTRICTIONS.
BGM WATCHES/WARNINGS/ADVISORIES
PA...WINTER STORM WATCH FROM THURSDAY AFTERNOON THROUGH FRIDAY
AFTERNOON FOR PAZ038>040-043-044-047-048-072.
NY...WINTER STORM WATCH FROM THURSDAY AFTERNOON THROUGH FRIDAY
AFTERNOON FOR NYZ022>025-044>046-055>057-062.
WINTER WEATHER ADVISORY FROM 4 PM FRIDAY TO 1 AM EST SATURDAY
FOR NYZ057-062.
SYNOPSIS...ES
NEAR TERM...ES
SHORT TERM...BJT
LONG TERM...MJM
AVIATION...ES/JTC
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