As a warm front lifted across the region on Monday, April 21st, strong east to southeast winds were in place just above the surface thanks to a tightening pressure gradient and a powerful low level jet. These winds funneled through the western Mohawk Valley and western Adirondacks during the morning hours, as well as across the high terrain of the Taconics during the late morning through mid…
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS ALY wrote it up.
As a warm front lifted across the region on Monday, April 21st, strong east to southeast winds were in place just above the surface thanks to a tightening pressure gradient and a powerful low level jet. These winds funneled through the western Mohawk Valley and western Adirondacks during the morning hours, as well as across the high terrain of the Taconics during the late morning through mid afternoon hours.
Some weather stations in the region noted wind gusts of 35 to 45 MPH. These winds downed multiple trees and power lines across Herkimer County. In addition, around 9 trees were downed across the Taconics of eastern Columbia County, especially in the towns of Chatham, Caanan, New Lebanon, Ancram, Hillsdale, and Copake. These trees blocked roadways and caused some power outages. Most of the power outages were restored by the morning of Tuesday, April 21st.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Albany, NY wrote its last area forecast discussion before the first event at Apr 20, 6:57 AM EST, 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ALBANY NY 757 AM EDT MON APR 20 2015 .SYNOPSIS... PERIODS OF RAIN ARE EXPECTED ACROSS THE AREA TODAY AND TONIGHT AS A LOW PRESSURE SYSTEM TRACKS INTO THE GREAT LAKES...AND A FRONTAL SYSTEM ASSOCIATED WITH THE LOW APPROACHES FROM THE WEST. EAST TO SOUTHEAST WINDS WILL BECOME STRONG AND GUSTY TODAY AHEAD OF THE SYSTEM. A FEW RUMBLES OF THUNDER WILL BE POSSIBLE TONIGHT AS THE FRONT PASSES. SOME BREAKS IN THE CLOUDS WILL DEVELOP TUESDAY AFTERNOON BEHIND THE FRONT...OTHERWISE GENERALLY COOL AND SOMEWHAT UNSETTLED CONDITIONS WILL PERSIST THROUGH THE REMAINDER OF THE WEEK AS A LARGE UPPER LEVEL LOW REMAINS ANCHORED NORTH OF THE GREAT LAKES. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... AS OF 7 AM EDT...ONE BAND OF LIGHT TO MODERATE RAIN WAS MOVING QUICKLY NORTHWARD INTO THE SOUTHERN ADIRONDACKS...SOUTHERN VT AND THE UPPER HUDSON RIVER VALLEY. SOME WET SNOW COULD BE OCCURRING FOR ELEVATIONS ABOVE 1800 FT WITHIN THIS BAND. ANY ACCUMS SHOULD REMAIN UNDER AN INCH WHERE SNOWFALL OCCURS INITIALLY. ANOTHER BAND OF MODERATE RAIN WAS OVER EASTERN PA/WESTERN NJ...AND TRANSLATING N/NE. THIS SHOULD OVERSPREAD SOUTHERN AREAS OVER THE NEXT 1-2 HOURS...AND FURTHER N AND E BETWEEN 10 AM AND NOON. OTHERWISE...IT APPEARS THAT THE MOST WIDESPREAD RAIN SHOULD OCCUR MAINLY THIS MORNING IN ASSOCIATION WITH THE BEST SURGE OF ISENTROPIC LIFT AND ATTENDANT LOW LEVEL JET PASSING ACROSS. THE RAIN MAY BE MODERATE TO HEAVY FOR A TIME...ESP ACROSS THE MID HUDSON VALLEY...NW CT...THE SE CATSKILLS...AND SOUTHERN BERKSHIRES. THE STEADIER RAIN SHOULD TAPER TO SHOWERS AND SOME DRIZZLE FOR THIS AFTERNOON AS THE LOW LEVEL JET AND STRONGEST ISENTROPIC LIFT PASS NORTH AND EAST OF THE REGION. SOUTH/EAST FACING HIGHER ELEVATIONS WILL BE MOST PRONE TO MORE PERSISTENT SHOWERS AND DRIZZLE THIS AFTERNOON. GUSTY EAST/SOUTHEAST WINDS WILL DEVELOP THIS MORNING AS THE AFOREMENTIONED LOW LEVEL JET AND TIGHT PRESSURE GRADIENT PASS THROUGH. THE BEST CHANCE FOR STRONGER WINDS TO MIX DOWN WILL BE ACROSS HIGHER TERRAIN OF THE TACONICS...SOUTHERN GREEN MTNS...AND BERKSHIRES...WHERE SOME GUSTS OF 50-55 MPH MAY OCCUR...ESP FROM MID MORNING THROUGH EARLY AFTERNOON. WIND GUSTS OF 35-45 MPH WILL ALSO BE LIKELY ACROSS PORTIONS OF THE WESTERN ADIRONDACKS...MOHAWK VALLEY AND EASTERN CATSKILLS. IN MOST VALLEY AREAS...SOME WIND GUSTS OF 25-35 MPH COULD OCCUR EARLY THIS MORNING AS THE RAIN INITIALLY REACHES THE GROUND. HOWEVER...THE BOUNDARY LAYER SHOULD THEN STABILIZE ONCE WET BULB COOLING OCCURS...DIMINISHING THE THREAT OF STRONGER WINDS MIXING DOWN TO THE VALLEY FLOOR. TEMPS MAY HOLD STEADY...OR EVEN FALL A BIT THIS MORNING AS THE RAIN OCCURS...BEFORE SLOWLY RISING THIS AFTERNOON. HAVE SIDED CLOSER TO THE COOLER MET MOS FOR MAX TEMPS...WITH MAINLY LOWER/MID 50S FOR VALLEY AREAS FROM ALBANY SOUTH...AND 40S ACROSS MOST HIGHER ELEVATIONS TO THE NORTH AND EAST...AS WELL AS ACROSS THE UPPER HUDSON VALLEY. THE MILDEST TEMPS MAY OCCUR ACROSS PORTIONS OF THE EASTERN CATSKILLS...SCHOHARIE VALLEY...AND WESTERN ADIRONDACKS LATER IN THE DAY...WHEN TEMPS MAY REACH THE MID 50S. && .SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY/... TONIGHT...A WARM FRONT WILL SLOWLY ATTEMPT TO LIFT NORTHWARD FROM THE MID ATLANTIC STATES...AS A COLD/OCCLUDED FRONT APPROACHES FROM THE GREAT LAKES REGION. ALTHOUGH THE PARENT LOW IS EXPECTED TO TRACK ACROSS THE GREAT LAKES REGION TONIGHT...A WEAK TRIPLE POINT LOW MAY FORM ALONG THE JUNCTION OF THE RETREATING WARM FRONT...AND APPROACHING COLD FRONT FROM THE WEST...SOMEWHERE OVER SOUTH CENTRAL PA. MODELS SUGGEST THAT SOME ELEVATED INSTABILITY...WITH SHOWALTER INDICES DIPPING INTO THE -1C TO -3C RANGE OVERSPREADS AT LEAST THE WESTERN AND SOUTHERN HALF OF THE REGION OVERNIGHT...WHICH...IN COMBINATION WITH SYNOPTIC LIFT AHEAD OF THE APPROACHING FRONTS...AND SOME QG FORCING AHEAD OF AN VORT LOBE APPROACHING FROM THE SOUTHWEST...MAY ALLOW FOR A ROUND OF ELEVATED CONVECTION LATER THIS EVENING AND OVERNIGHT...ESP FOR AREAS NEAR AND SOUTH OF INTERSTATE 90. SO...SOME RUMBLES OF THUNDER ARE NOT OUT OF THE QUESTION. ANY THUNDERSTORMS ARE EXPECTED TO REMAIN NON-SEVERE ACROSS OUR REGION...WHICH IS IN AGREEMENT WITH LATEST SPC DAY 1 OUTLOOK...WHICH KEEPS OUR AREA IN THE GENERAL THUNDER REGION. HOWEVER...ANY THUNDERSTORMS THAT OCCUR OVERNIGHT COULD HAVE LOCALLY HEAVY DOWNPOURS. TEMPS ARE EXPECTED TO HOLD NEARLY STEADY MOST OF THE NIGHT...BEFORE FALLING INTO THE 40S CLOSER TO DAYBREAK. TUESDAY...SOME LINGERING SHOWERS WILL BE POSSIBLE IN THE MORNING AS THE AFOREMENTIONED VORT LOBE SWINGS ACROSS. THEN...IT APPEARS THAT OUR REGION WILL EXPERIENCE A PERIOD OF SUBSIDENCE IN THE AFTERNOON HOURS...WHEN SOME BREAKS OF SUN COULD OCCUR. SOME LOW LEVEL INSTABILITY COULD ALLOW FOR ISOLATED SHOWERS TO DEVELOP LATER IN THE AFTERNOON...MAINLY ACROSS THE WESTERN ADIRONDACK REGION. MAX TEMPS ARE FORECAST TO REACH THE LOWER/MID 60S IN VALLEY AREAS AND 50S ACROSS HIGHER ELEVATIONS. TUE NT-WED...ANOTHER REINFORCING COLD FRONT AND UPPER LEVEL SHORTWAVE ARE EXPECTED TO CROSS THE REGION ON WED. WEAK RIDGING JUST AHEAD OF THIS FEATURE MAY ALLOW FOR SOME BREAKS IN THE CLOUDS TO CONTINUE INTO EARLY TUE NT...BEFORE CLOUDS REDEVELOP...AND SHOWERS OVERSPREAD THE REGION DURING WED. BOUNDARY LAYER TEMPS MAY BECOME QUITE CHILLY TUE NT/WED AM IF ENOUGH BREAKS IN THE CLOUDS CAN DEVELOP...WITH WIDESPREAD LOW TEMPS IN THE 30S. ON WED...DEPENDING ON THE TIMING OF SHOWER DEVELOPMENT...MAX TEMPS COULD BRIEFLY REACH THE UPPER 50S TO LOWER 60S IN VALLEYS...BEFORE FALLING ONCE SHOWERS OCCUR. FOR HIGHER ELEVATIONS...ONLY 40S ARE EXPECTED. IN FACT...SOME WET SNOW AND/OR GRAUPEL COULD OCCUR ACROSS THE SOUTHERN ADIRONDACKS AND HIGHER ELEVATIONS ACROSS THE CATSKILLS AND WESTERN NEW ENGLAND BY LATE WED. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... BELOW NORMAL TEMPERATURES AND INTERVALS OF SHOWERS AND SNOW SHOWERS AS LARGE UPPER LOW AND ASSOCIATED EASTERN NORTH AMERICAN UPPER TROUGHING CONTROLS THE WEATHER. THERE IS A GOOD CONSENSUS ON THE LARGE SCALE UPPER LOW AND UPPER TROUGH BUT DISAGREEMENT ON THE TRACK AND TIMING OF SMALL PIECES OF UPPER ENERGY ROTATING AROUND THE PERIPHERY OF THE UPPER LOW...SOME OF WHICH ARE EXPECTED TO TRACK THROUGH OR NEAR OUR REGION. SINCE THE CENTER OF THE UPPER LOW IS EXPECTED TO TRACK NORTH OF THE REGION...OR ACROSS OUR NORTHERN PORTION OF THE FORECAST AREA...THE DEEP FLOW ACROSS OUR REGION SHOULD BE WEST...WHICH TYPICALLY RESULTS ISOLATED TO SCATTERED COVERAGE OF SHOWERS AND SNOW SHOWERS. THE BEST COVERAGE ALSO IS TYPICALLY IN LEE OF LAKE ONTARIO INTO THE SOUTHERN ADIRONDACKS AND WESTERN MOHAWK VALLEY...AND ALSO INTO THE SOUTHERN GREEN MOUNTAINS TO NORTHERN TACONICS DUE TO SOME UPSLOPE...BUT AGAIN JUST SCATTERED. DAYTIME PRECIPITATION TYPE LOOKS TO BE JUST RAIN SHOWERS...BUT NIGHTTIME COULD SEE SOME SNOW SHOWER ACTIVITY...ESPECIALLY IN HIGHER ELEVATIONS. THERE ARE ALSO HINTS AT SOME UPPER ENERGY POSSIBLY INTERACTING WITH THE SOUTHERN STREAM NEXT WEEKEND THAT COULD SUPPORT MORE ORGANIZED LOW PRESSURE AND MORE ORGANIZED PRECIPITATION...WITH COLDER THAN NORMAL TEMPERATURES IN PLACE...WILL JUST WATCH CAREFULLY. NOT GETTING TO SPECIFIC ON TIMING OF INTERVALS OF SHOWERS/SNOW SHOWERS DUE TO THE INCONSISTENCIES IN THE FINE DETAILS IN SOURCES OF GUIDANCE...BUT THERE WILL BE PERIODS OF DRY WEATHER EVEN WITH THE DOMINANCE OF ISOLATED TO SCATTERED SHOWERS/SNOW SHOWERS IN THE FORECAST. THERE WILL ALSO BE SOME INTERVALS OF BREAKS IN THE CLOUDS AND AGAIN...TRYING TO BROADBRUSH TIMING OF ANY CLOUDINESS VERSUS BREAKS IN THE CLOUDS. HIGHS THURSDAY THROUGH SUNDAY LOOK TO BE IN THE LOWER TO MID 50S...BUT 40S HIGHER ELEVATIONS...AND MAYBE BARELY 40 IN SOME PARTS OF THE SOUTHERN ADIRONDACKS. LOWS IN THE 20S AND 30S AT NIGHT WITH COLDEST TEMPERATURES IN HIGHER ELEVATIONS. && .AVIATION /12Z MONDAY THROUGH FRIDAY/... AN APPROACHING WARM FRONT AND A LOW PRESSURE SYSTEM WILL BRING A WIDESPREAD SOAKING RAINFALL TO THE REGION FROM THIS MORNING THROUGH TONIGHT. VFR/LOW MVFR CONDITIONS SHOULD PERSIST THROUGH THE LATE MORNING...AS RAIN HAS BEEN LIGHT AND THE ATMOSPHERE IS STILL TAKING SOME TIME TO MOISTEN. CIGS WILL GRADUALLY LOWER...BUT SHOULD REMAIN VFR THROUGH 14Z-16Z THIS MORNING. OCCASIONAL LIGHT TO MODERATE RAIN SHOULD PREVAIL AFTER 14Z-16Z. RAIN INTENSITY SHOULD WEAKEN BY MID TO LATE AFTERNOON BUT OCCASIONAL LIGHT RAIN IS EXPECTED TO CONTINUE. CONDITIONS WILL GENERALLY DETERIORATE TO MVFR ALTHOUGH SOME BRIEF IFR IS POSSIBLE BEFORE 00Z TUESDAY. AFTER 00Z... CEILINGS WILL CONTINUE TO LOWER TOWARD IFR BUT ENOUGH UNCERTAINTY TO JUST INDICATE SCATTERED LAYER BELOW 1000 FEET WITH CEILINGS AROUND 1000 FEET BETWEEN 00Z-12Z. VISIBILITIES WILL CONTINUE MVFR WITH PERIODS OF LIGHT RAIN THROUGH THIS EVENING. LOW LEVEL WIND SHEAR /LLWS/ IS EXPECTED AT KPSF/KPOU AND KGFL THROUGH THE DAY AND WAS BEGUN AT 12Z...AS A STRONG SOUTHEAST JET ALOFT MOVES OVERHEAD. SURFACE WINDS SHOULD BE STRONGER AND OCCASIONALLY GUSTY AT KALB...SO WILL LEAVE OUT MENTION OF LLWS FOR NOW. LLWS SHOULD END BY 00Z AS THE LOW LEVEL JET SEGMENT EXITS THE REGION. SURFACE WINDS WILL BE EAST-SOUTHEAST AROUND 10-16 KT BY THE LATE MORNING. GUSTS COULD EXCEED 20-25 KT... ESPECIALLY AT KALB/KPSF. WINDS REMAIN EAST TO SOUTHEAST THIS EVENING BUT DIMINISH TO 10 KT OR LESS. WINDS WILL SHIFT TO SOUTHWEST AT 6 KT OR LESS LATER TONIGHT. OUTLOOK... TUESDAY NIGHT: LOW OPERATIONAL IMPACT. SLIGHT CHANCE OF SHRA. WEDNESDAY: MODERATE OPERATIONAL IMPACT. CHANCE OF SHRA. WEDNESDAY NIGHT: MODERATE OPERATIONAL IMPACT. CHANCE OF SHRA. THURSDAY: LOW OPERATIONAL IMPACT. ISOLATED SHRA. THURSDAY NIGHT: NO OPERATIONAL IMPACT. NO SIG WX. FRIDAY: LOW OPERATIONAL IMPACT. ISOLATED SHRA. && .FIRE WEATHER... A WIDESPREAD SOAKING RAINFALL WILL OCCUR ACROSS THE AREA TODAY AND TONIGHT...WITH RAINFALL AMTS OF 0.75-1.5 INCHES EXPECTED. THE WEATHER WILL BE COOL AND UNSETTLED FOR MUCH OF THE WEEK. && .HYDROLOGY... A WIDESPREAD SOAKING RAINFALL WILL OCCUR ACROSS THE AREA TODAY AND TONIGHT. EXPECTING WIDESPREAD QPF AMOUNTS OF AROUND AN INCH WITH HIGHER AMOUNTS UP TO AROUND 1.5 INCHES WHERE THE RAINFALL IS ENHANCED BY THE STRONG EAST TO SOUTHEAST FLOW...PARTICULARLY ACROSS THE CENTRAL AND SOUTHEASTERN CATSKILLS...TACONICS...BERKSHIRES INTO THE LITCHFIELD HILLS AND ACROSS SOUTHERN VERMONT. LOCALIZED HIGHER AMOUNTS OF 2 TO 3 INCHES WILL BE POSSIBLE. THERE IS STILL SOME SNOW COVER LEFT IN THE FORECAST AREA. BASED ON NATIONAL OPERATIONAL HYDROLOGIC REMOTE SENSING CENTER (NOHRSC) THIS IS ACROSS THE PORTIONS OF THE WESTERN ADIRONDACKS AND ACROSS THE HIGHER TERRAIN OF THE SOUTHERN GREEN MOUNTAINS. BASED ON CURRENT FORECASTS...ONLY THE SCHOHARIE CREEK AT GILBOA DAM IS FORECAST TO REACH ITS FLOOD STAGE AND THE WEST CANADA CREEK AT HINCKLEY DAM TO EXCEED ITS FLOOD STAGE BOTH BY TUESDAY EVENING. THE REST OF THE WEEK THE FORECAST WILL BE DOMINATED BY A PERSISTENT UPPER LEVEL TROUGH WHICH WILL RESULT IN COOL TEMPERATURES...BREEZY CONDITIONS AND OCCASIONAL CHANCES FOR MAINLY LIGHT PRECIPITATION. FOR DETAILS ON SPECIFIC AREA RIVER AND LAKES...INCLUDING OBSERVED AND FORECAST RIVER STAGES AND LAKE ELEVATIONS...PLEASE VISIT THE ADVANCED HYDROLOGIC PREDICTION SERVICE /AHPS/ GRAPHS ON OUR WEB- SITE. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...NONE. NY...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR NYZ054-061. MA...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR MAZ001-025. VT...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR VTZ013-014. && SYNOPSIS...IAA/KL NEAR TERM...KL SHORT TERM...KL LONG TERM...NAS AVIATION...WASULA/NAS FIRE WEATHER...IAA/KL HYDROLOGY...IAA/KL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ALBANY NY 516 AM EDT MON APR 20 2015 MAZ001-025-NYZ054-061-VTZ013-014-211115- NORTHERN BERKSHIRE-SOUTHERN BERKSHIRE-EASTERN RENSSELAER- EASTERN COLUMBIA-BENNINGTON-WESTERN WINDHAM- 516 AM EDT MON APR 20 2015 ...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NORTHERN AND CENTRAL TACONICS...THE BERKSHIRES...AND BENNINGTON AND WESTERN WINDHAM COUNTIES IN SOUTHERN VERMONT. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. WIND ADVISORY. THERE IS A SLIGHT CHANCE OF NONSEVERE THUNDERSTORMS TONIGHT. ANY THUNDERSTORM THAT DEVELOPS WILL MOVE FROM THE SOUTHWEST...TOWARD THE NORTHEAST AROUND 40 MPH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE REQUESTED TO SEND REPORTS OF WIND DAMAGE TO THE NATIONAL WEATHER SERVICE. CTZ001-013-NYZ032-033-038>043-047>053-058>060-063>066-082>084-VTZ015- 211115- NORTHERN LITCHFIELD-SOUTHERN LITCHFIELD-NORTHERN HERKIMER-HAMILTON- SOUTHERN HERKIMER-SOUTHERN FULTON-MONTGOMERY-NORTHERN SARATOGA- NORTHERN WARREN-NORTHERN WASHINGTON-SCHOHARIE-WESTERN SCHENECTADY- EASTERN SCHENECTADY-SOUTHERN SARATOGA-WESTERN ALBANY-EASTERN ALBANY- WESTERN RENSSELAER-WESTERN GREENE-EASTERN GREENE-WESTERN COLUMBIA- WESTERN ULSTER-EASTERN ULSTER-WESTERN DUTCHESS-EASTERN DUTCHESS- NORTHERN FULTON-SOUTHEAST WARREN-SOUTHERN WASHINGTON-EASTERN WINDHAM- 516 AM EDT MON APR 20 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWESTERN CONNECTICUT...EAST CENTRAL NEW YORK NOT INCLUDING THE NORTHERN AND CENTRAL TACONICS...AND FOR EASTERN WINDHAM COUNTY IN SOUTHERN VERMONT. .DAY ONE...TODAY AND TONIGHT. THERE IS A SLIGHT CHANCE OF NONSEVERE THUNDERSTORMS TONIGHT. ANY THUNDERSTORM THAT DEVELOPS WILL MOVE FROM THE SOUTHWEST...TOWARD THE NORTHEAST AROUND 40 MPH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The national radar mosaic for the moment the first event began.
3 strong wind. Local standard time, as filed.
Trees and wires were reported down in Ohio, Little Falls, Norway and Russia due to strong winds.
Trees and wires were reported down in Old Forge due to strong winds.
As a result of strong winds, around nine trees were downed across eastern Columbia County, especially in the towns of Chatham, Caanan, New Lebanon, Ancram, Hillsdale, and Copake. These trees blocked roadways and caused some brief power outages.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2015Every state in 2015This day in weather historyWarnings in New York, April 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 561443, 561578, 561172.