A strong pressure gradient between strong low pressure to the north and high pressure building from the west resulted in strong northwester winds across the area.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 OKX wrote it up.
A strong pressure gradient between strong low pressure to the north and high pressure building from the west resulted in strong northwester winds across the area.
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 New York, NY wrote its last area forecast discussion before the first event at Dec 29, 1:15 PM EST, 45 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
115 PM EST TUE DEC 29 2009
.SYNOPSIS...
AN ARCTIC COLD FRONT EAST OF THE REGION WILL USHER IN A COLD
AIRMASS WHICH WILL REMAIN THROUGH THE MIDDLE OF THE WEEK. A
STRENGTHENING STORM WILL IMPACT THE REGION BY THE END OF THE
WEEK...WITH THE REMNANTS OF THE SYSTEM POTENTIALLY LINGERING
THROUGH THE WEEKEND.
&&
.NEAR TERM /UNTIL 7 PM THIS EVENING/...
TEMP AND DEWPOINT FORECASTS CURRENTLY ON TRACK. CAA CONTINUING
THROUGH AFTERNOON AS SOLID WIND ADVISORY ONGOING...WITH GUSTS
APPROACHING 50 MPH. WIND GUSTS INCREASED IN GRIDS TO REFLECT THIS.
LATEST DATA SUGGEST THE HIGHEST WINDS OCCURRING IN THE NEXT 3 TO 4
HOURS. WIND ADVY IN EFFECT TILL 00Z ENTIRE CWA.
OTHERWISE COLD WITH WIND CHILLS IN THE SINGLE DIGITS TO AROUND 10
ABOVE. ANY SNOW SHOWERS HAVE REMAINED IN THE VICINITY OF
BINGHAMPTON AND TEMP/DEWPOINT SPREADS IN THE LOCAL REGION SHOULD
BE LARGE ENOUGH TO MAINTAIN DRY CONDITIONS.
&&
.SHORT TERM /7 PM THIS EVENING THROUGH THURSDAY/...
WIND GUSTS DIMINISH WITH DECREASING WINDS ALOFT. WAA WILL ENSUE
ALOFT AS RIDGE STARTS TO MOVE INTO THE REGION WITH LOWERING
TEMP INVERSION. WIND CHILLS IN THE CITY IN THE LOW SINGLE DIGITS.
NO WIND CHILL ADVY WILL THEREFORE BE ISSUED. WIND CHILLS FAIRLY
UNIFORM ELSEWHERE ACROSS THE CWA WITH LIGHTER WINDS AND COLDER
TEMPS INTERIOR AND THE REVERSE ALONG THE COASTS.
THE RIDGE OF HIGH PRESSURE ARRIVES WITH DRY CONDITIONS CONTINUING
ON WED. TEMPS BELOW CLIMO AGAIN WITH LIMITED VERTICAL MIXING AND
850 TEMPS STILL RANGING BETWEEN -7 AND -3 DEGREES C.
NEXT SYSTEM BEGINS IT/S APPROACH THU WITH HIGH PRESSURE MOVING
OFFSHORE. HIGHS CLOSE TO CLIMO WITH SOUTHWEST FLOW AT
SURFACE DEVELOPING. SUBTROPICAL TAP CAN ALREADY BE SEEN ON STLT.
THIS SUPPORTS A FASTER ONSET OF PCPN. POPS THEREFORE INCREASED.
LGT ONSHORE FLOW LIKELY TO WARM THE COASTS...ESPECIALLY ERN LI.
WITH THE HIGH DEPARTING...EVAP COOLING WILL FAVOR SN
INTERIOR...RASN METRO AND CSTL CT...WITH RA IMMEDIATE LI SHORE.
INTENSITY OF PCPN LGT ATTM WITH THE MAIN ACTIVITY FOCUSED ON THE
LONG TERM PERIOD.
&&
.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
ACTIVE PATTERN WITH LOW PRES ORIGINATING FROM THE GULF OF MEXICO
WILL BRING YET ANOTHER COASTAL STORM TO THE REGION FOR THE NEW YEAR.
MEDIUM RANGE MODELS/ENSEMBLES ARE COMING INTO BETTER ALIGNMENT...AND
A 2:1 BLEND OF THE 00Z ECMWF AND 00Z GFS LOOKS REASONABLE AT THIS
TIME. UPPER TROUGH MOVES ACROSS THE SE STATES WITH SFC CYCLOGENESIS
OCCURRING OVER THE GULF OF MEXICO. LOW TRACKS ACROSS THE SE STATES
ON THU AND OFF CAROLINA COAST THU NIGHT. THE LOW THEN TRACKS NE
CLOSE TO THE 40N 70W BENCHMARK FRI...THEN RETROGRADES INTO THE GULF
OF MAINE FRI NIGHT AS THE UPPER TROUGH BECOMES NEGATIVELY TILTED.
STRENGTH...TIMING AND POSITION OF THIS SYSTEM IS CRUCIAL AND ANY
SHIFT IN TRACK WOULD CAUSE A SIGNIFICANT CHANGE TO THE
FORECAST...BUT AT THIS TIME...PROFILES APPEAR TO SUPPORT ALL SNOW
ACROSS THE LOWER HUDSON VALLEY...AND PORTIONS OF NE NJ AND INTERIOR
SOUTHERN CT...WHILE A RAIN OR AN RAIN/SNOW MIX WILL PREVAIL AT THE
COAST...POPS TAPER TO CHC ON FRI NIGHT AND SAT AND BECOME MORE
SHOWERY IN NATURE...BUT ANY WRAP AROUND MOISTURE WOULD BECOME SNOW
EVERYWHERE.
THEN...WITH SEVERAL WEAK SHORTWAVES AND POSSIBLE BACK DOOR COLD
FRONTS SLIDING THROUGH THE REGION...WILL KEEP SLIGHT CHANCE POPS IN
THE FCST INTO THE START OF THE NEW WEEK.
TEMPS START OFF AROUND NORMAL LEVELS...BUT DROP BELOW SEASONABLE
LEVELS STARTING FRI NIGHT AND CONTINUE THROUGH THE REMAINDER OF THE
FORECAST PERIOD.
&&
.AVIATION /18Z TUESDAY THROUGH SUNDAY/...
VFR THROUGH THE PERIOD.
VERY STRONG WINDS...SUSTAINED NEAR 25-30 KT GUSTING TO 45 KTS TODAY.
DIRECTIONS VERY BETWEEN 280 AND 320 DEG...BUT THE GENERAL TREND WILL
BE VEERING INTO THE AFTERNOON...THEN BACKING THIS EVENING. HIGHEST
WINDS LOOK TO LAST THROUGH ABOUT 20Z...BUT GUSTS ABOUT 20 KTS
THROUGH 04-06Z.
AS THE ATMOSPHERE MIXES TO ABOUT 6000 FT...EXPECT WIDESPREAD
COMPRESSION. LLWS CRITERIA NOT BEING MET...HOWEVER WOULD EXPECT TO
SEE MANY PIREPS WITH +/- 20 KTS ON APPROACH.
TAF COMMENTS (FORECASTER INSIGHT ON TIMING, CONFIDENCE, TRENDS AND GROUND OPS)
KEWR...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
KEWR HOURLY WIND FORECAST
ALL WIND DIRECTIONS ARE TRUE...ADD 13 DEGREES FOR MAGNETIC
29/16Z 31027G38KT
29/17Z 31029G43KT
29/18Z 31028G43KT
29/19Z 31026G37KT
29/20Z 31023G31KT
29/21Z 31021G29KT
29/22Z 31019G28KT
29/23Z 31018G27KT
30/00Z 31017G25KT
30/01Z 31016G22KT
30/02Z 31016G22KT
30/03Z 31015G21KT
KJFK...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
KLGA...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
KTEB...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
KHPN...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
KSWF...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
KISP...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
KBDR...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
KGON...FORECAST ON TRACK...NO UNSCHEDULED AMENDMENTS
ANTICIPATED
OUTLOOK 00Z TUESDAY THROUGH FRIDAY...
TUE-WED...VFR WITH STRONG NW WINDS DIMINISHING ON WEDNESDAY.
THU...VFR.
FRI-SAT...POSSIBLE SUB-VFR WITH MIXED PCPN AND INCREASING NE FLOW.
&&
.MARINE...
GALES ON ALL WATERS THROUGH THE AFTERNOON...WITH AN OCNL STORM
FORCE GUST IS POSSIBLE...ESPECIALLY ACROSS THE OCEAN 10 TO 20 NM
OFFSHORE. THE GALES WILL DIMINISH FROM W TO E TNGT...WITH SCA
CONDITIONS LINGERING INTO THE EARLY MRNG HOURS WED.
HIGH PRES BUILDS OVER THE ERN SEABOARD WED WITH WINDS DIMINISHING
FURTHER. SEAS ON THE OCEAN SUBSIDE TO 1-2 FT WITH CONDITIONS BLW
SCA CRITERIA THU.
STRONG SCA WINDS/WAVES WITH THE POTENTIAL FOR GALE FORCE WINDS
THROUGH THE LONG TERM PERIOD AS LOW PRES TRACKS THROUGH THE WATERS.
SEAS ON THE OCEAN START OUT AS 2-4 FT THU EVENING BEFORE QUICKLY
RAMPING UP TO 5-7 FT AFTER MIDNIGHT. SEAS THEN BUILD TO 8-12 FT ON
THE OCEAN FRI NIGHT BEFORE SLOWLY SUBSIDING TO 6-8 FT THROUGH SAT.
&&
.HYDROLOGY...
THE PASSAIC AT PINEBROOK IS ABV FLOOD STAGE AND IS FCST TO CREST
THIS AFTN. THE RIVER FALL BLW FLOOD STAGE WED EVE.
THE NEXT CHANCE FOR SIG PCPN WILL BE LATE THU THRU FRI WITH LOW
PRES TRACKING UP THE E COAST.
&&
.TIDES/COASTAL FLOODING...
SURGE GUIDANCE SHOWS THAT TIDAL DEPARTURES WILL BE AROUND -2 FT
THIS AFTERNOON FOR HARBOR...BAYS...AND SOUND. HENCE...LOW WATER
ADVISORY ISSUED TO ADDRESS THIS ISSUE AROUND THE TIMES OF LOW
TIDE.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
CT...WIND ADVISORY UNTIL 7 PM EST THIS EVENING FOR CTZ005>012.
NY...WIND ADVISORY UNTIL 7 PM EST THIS EVENING FOR NYZ067>081.
NJ...WIND ADVISORY UNTIL 7 PM EST THIS EVENING FOR NJZ002>006-011.
MARINE...LOW WATER ADVISORY UNTIL 5 PM EST THIS AFTERNOON FOR ANZ330-
335-338-340-345.
GALE WARNING UNTIL MIDNIGHT EST TONIGHT FOR ANZ330-335-338-340-
345-350-353-355.
&&
SYNOPSIS...JMC
NEAR TERM...JM
SHORT TERM...JMC
LONG TERM...
AVIATION...BS
MARINE...JMC
HYDROLOGY...JMC
TIDES/COASTAL FLOODING...HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE NEW YORK NY 1251 PM EST TUE DEC 29 2009 NYZ072>076-301800- NEW YORK (MANHATTAN)-BRONX-RICHMOND (STATEN ISLAND)-KINGS (BROOKLYN)- QUEENS- 1251 PM EST TUE DEC 29 2009 ...WIND ADVISORY IN EFFECT UNTIL 7 PM EST THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NEW YORK. .DAY ONE...THIS AFTERNOON 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. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A COASTAL STORM COULD BRING A SIGNIFICANT SNOW TO AT LEAST PARTS OF THE REGION STARTING NEW YEARS EVE AND LASTING INTO SATURDAY. THE DEVELOPMENT...TRACK AND INTENSITY OF THIS POTENTIAL STORM ARE UNCERTAIN AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. && THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN EFFECT ARE HIGHLIGHTED. PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS WARNING CRITERIA. CTZ005>012-NJZ002>006-011-NYZ067>071-077>081-301800- NORTHERN FAIRFIELD-NORTHERN NEW HAVEN-NORTHERN MIDDLESEX- NORTHERN NEW LONDON-SOUTHERN FAIRFIELD-SOUTHERN NEW HAVEN- SOUTHERN MIDDLESEX-SOUTHERN NEW LONDON-WESTERN PASSAIC-BERGEN- EASTERN PASSAIC-ESSEX-HUDSON-UNION-ORANGE-PUTNAM-ROCKLAND- NORTHERN WESTCHESTER-SOUTHERN WESTCHESTER-NASSAU- NORTHWESTERN SUFFOLK-NORTHEASTERN SUFFOLK-SOUTHWESTERN SUFFOLK- SOUTHEASTERN SUFFOLK- 1251 PM EST TUE DEC 29 2009 ...WIND ADVISORY IN EFFECT UNTIL 7 PM EST THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN CONNECTICUT...NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK. .DAY ONE...THIS AFTERNOON 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. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A COASTAL STORM COULD BRING A SIGNIFICANT SNOW TO AT LEAST PARTS OF THE REGION STARTING NEW YEARS EVE AND LASTING INTO SATURDAY. THE DEVELOPMENT...TRACK AND INTENSITY OF THIS POTENTIAL STORM ARE UNCERTAIN AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. && THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN EFFECT ARE HIGHLIGHTED. PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS WARNING CRITERIA. ANZ330-335-338-340-345-301800- LONG ISLAND SOUND EAST OF NEW HAVEN CT/PORT JEFFERSON NY- LONG ISLAND SOUND WEST OF NEW HAVEN CT/PORT JEFFERSON NY- NEW YORK HARBOR-PECONIC AND GARDINERS BAYS- SOUTH SHORE BAYS FROM JONES INLET THROUGH SHINNECOCK BAY- 1251 PM EST TUE DEC 29 2009 ...GALE WARNING IN EFFECT UNTIL MIDNIGHT EST TONIGHT... ...LOW WATER ADVISORY IN EFFECT UNTIL 5 PM EST THIS AFTERNOON... THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. LOW WATER ADVISORY. GALE WARNING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY GALES ARE ALSO POSSIBLE LATE IN THE WEEK DEPENDING ON THE DEVELOPMENT AND TRACK OF A POSSIBLE STORM. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. && THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN EFFECT ARE HIGHLIGHTED. PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS WARNING CRITERIA. ANZ350-353-355-301800- MORICHES INLET NY TO MONTAUK POINT NY OUT 20 NM- FIRE ISLAND INLET NY TO MORICHES INLET NY OUT 20 NM- SANDY HOOK NJ TO FIRE ISLAND INLET NY OUT 20 NM- 1251 PM EST TUE DEC 29 2009 ...GALE WARNING IN EFFECT UNTIL MIDNIGHT EST TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. GALE WARNING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY GALES ARE ALSO POSSIBLE LATE IN THE WEEK DEPENDING ON THE DEVELOPMENT AND TRACK OF A POSSIBLE STORM. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. && THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN EFFECT ARE HIGHLIGHTED. PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS WARNING CRITERIA.
The national radar mosaic for the moment the first event began.
1 strong wind. Local standard time, as filed.
A 51 mph gust was reported at Groton/New London Airport. These strong winds also knocked a 75 foot tall Spruce tree onto a house at 147 Shore Road in Waterford which produced damage to the roof and front porch.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Connecticut in 2009Every state in 2009This day in weather historyWarnings in Connecticut, December 2009
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: 205815.