An upper level trough and associated surface low pressure system slowly advanced towards the local area from the Ohio Valley triggering scattered thunderstorms with heavy rain which caused flash flooding in Greenwich.
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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 OKX wrote it up.
An upper level trough and associated surface low pressure system slowly advanced towards the local area from the Ohio Valley triggering scattered thunderstorms with heavy rain which caused flash flooding in Greenwich.
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 Jun 18, 6:43 PM EST, 47 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW YORK NY 743 PM EDT THU JUN 18 2009 .SYNOPSIS... LOW PRESSURE PASSING THROUGH THE REGION WILL LIKELY BRING MORE SHOWERS TONIGHT...FOLLOWED BY A PERIOD OF MAINLY DRY WEATHER FRIDAY. A STRONGER LOW PRESSURE SYSTEM WILL BRING THE POTENTIAL FOR HEAVY RAIN SATURDAY AND SATURDAY NIGHT. A CUTOFF LOW PRESSURE SYSTEM WILL REMAIN ANCHORED EAST OF OUR REGION THROUGH THE MIDDLE OF NEXT WEEK...BRINGING A FEW MORE SHOWERS AND SLIGHTLY BELOW NORMAL TEMPERATURES. && .NEAR TERM /THROUGH FRIDAY/... MODERATE RAIN SHOWERS WILL CONTINUE ON LONG ISLAND THIS EVENING BUT SHOULD REMAIN SCATTERED OVER NORTHERN NEW JERSEY. BOTH THE NAM AND GFS INDICATE A RENEWED SURGE OF SHOWER ACTIVITY BETWEEN 21Z AND 00Z OVER THE REGION BUT RADAR AND SATELLITE IMAGERY HAVE YET TO SHOW ANY SUCH TREND. HAVE CONTINUED WITH CATEGORICAL POPS IN SOUTHERN CT AND ON LONG ISLAND WITH LIKELY POPS FARTHER TO THE WEST. AREAS OF FOG CAN BE EXPECTED OVERNIGHT DUE TO THE HIGH MOISTURE CONTENT OF THE AIR. && .SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY/... A MUCH DRIER DAY IS IN STORE FOR FRIDAY AS MODELS SHOW MID LEVEL DRY AIR...WITH THE BULK OF THE WEAK LOW PRESSURE SYSTEM MAINLY TO THE NORTHEAST OF THE FORECAST AREA. HOWEVER...WITH LINGERING LOW LEVEL MOISTURE PRESENT...THERE WILL STILL BE A SMALL CHANCE OF MAINLY AFTERNOON SHOWERS. TOTAL TOTALS INDICES CLIMB TO NEAR 46 AND SFC LIFTED INDICES REACH -2 TO -3. CANNOT RULE OUT A TSTM BUT DID NOT INCLUDE IN THE FORECAST AS YET. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... ***THE MAIN CONCERN WILL REVOLVE AROUND THE POTENTIAL FOR HEAVY RAIN AND POSSIBLE FLOODING SATURDAY AND SATURDAY NIGHT*** FRIDAY NIGHT THROUGH SATURDAY NIGHT... A STRONG UPPER LEVEL DISTURBANCE WILL SLIDE SOUTHEAST FROM THE GREAT LAKES FRIDAY NIGHT AND CLOSE OFF INTO A DEEP ANOMALOUS UPPER LEVEL LOW PRESSURE SYSTEM. THE EXACT TRACK THIS SYSTEM REMAINS A BIT UNCERTAIN...BUT AFTER LOOKING AT THE ENSEMBLES FEEL THAT THE GFS MAY BE TOO FAR NORTH WITH THE TRACK AND SUFFERING FROM CONVECTIVE FEEDBACK. THE SREF ENSEMBLES AND MOST OF OUR OTHER MODEL GUIDANCE TAKE THE SLOW MOVING LOW PRESSURE SYSTEM SOUTHEAST...PASSING SOUTH OF LONG ISLAND SATURDAY/SATURDAY NIGHT WHICH SEEMS TO MAKE MORE SENSE. MUCH OF FRIDAY NIGHT MAY END UP DRY...BUT WILL HAVE SOME CHANCE POPS IN AS SOME SHOWERS MAY MOVE INTO THE REGION LATE. WE MAY ALSO SEE AREAS OF FOG DEVELOP WITH A FAIR AMOUNT OF LOW LEVEL MOISTURE. OTHERWISE...THE MAIN EVENT AND THE POTENTIAL FOR HEAVY RAIN LOOKS TO OCCUR SATURDAY AND OR SATURDAY NIGHT. FOR NOW WILL RUN WITH HIGH END LIKELY POPS...SINCE THERE STILL IS SOME DISAGREEMENT ON TIMING/LOCATION OF HEAVIEST PRECIPITATION. HOWEVER...LATER SHIFTS MAY CERTAINLY NEED TO GO WITH CATEGORICAL POPS. AS FOR CONVECTION...THERE IS SOME ELEVATED INSTABILITY SO WILL INCLUDE A CHANCE OF THUNDERSTORMS SATURDAY AND SATURDAY NIGHT. THE SLOW MOVING LOW PRESSURE IS QUITE DEEP FOR THIS TIME OF YEAR AND IS EXPECTED TO BE AROUND 995 MB AS IT PASSES SOUTH OF LONG ISLAND. PWATS EXCEED 2 INCHES SO THE ATMOSPHERE WILL CERTAINLY BE JUICED. THIS WILL BRING THE POTENTIAL FOR HEAVY RAINFALL TO THE REGION ALONG WITH POSSIBLY SOME FLOODING. SINCE THERE WILL LIKELY BE CONVECTION INVOLVED THE MODELS ARE PROBABLY GOING TO HAVE TROUBLE PINNING AN AREA MOST SUSCEPTIBLE TO HEAVY RAIN. WILL JUST HAVE TO WAIT AND SEE HOW THINGS EVOLVE OVER THIS TIME...BUT WE MAY EVENTUALLY NEED A FLOOD WATCH. HOWEVER...SINCE ITS THE 4TH PERIOD FEEL THERE IS MORE TIME TO EVALUATE THIS POTENTIAL. AS FOR TEMPERATURES...CLOUDS AND INCREASING DEWPOINTS SHOULD HOLD LOWS FRIDAY NIGHT AND SATURDAY NIGHT IN THE 60S. WE FEEL THAT GFS MOS GUIDANCE IS TOO WARM FOR HIGHS ON SATURDAY...AND WILL GO WITH UPPER 60S TO THE 70S ACROSS MOST LOCATIONS. SUNDAY THROUGH THURSDAY... VERTICALLY STACKED LOW PRESSURE WILL BE VERY SLOWLY TO MOVE EAST OF THE REGION OVER THIS TIME. THIS MAY KEEP A NORTHEAST FLOW OF AIR OVER THE REGION AND A CONTINUED THREAT FOR SHOWERS MUCH OF THE TIME. HOWEVER...ITS UNCERTAIN AS TO HOW CLOSE THE SYSTEM WILL BE TO OUR REGION AND THE WESTWARD EXTENT OF THE PRECIPITATION SHIELD. FOR NOW...WILL KEEP A CHANCE OF SHOWERS IN THE FORECAST THROUGH MOST OF THE PERIOD. WE DO NOT EXPECT IT TO BE A WASHOUT OVER THIS TIME...AND THERE WILL LIKELY BE PLENTY OF DRY WEATHER MIXED IN. HOWEVER...THERE CERTAINLY IS THE RISK FOR THE POTENTIAL OF SHOWERS TO AFFECT THE REGION AND WORTH MAINTAINING CHANCE POPS. ALSO...FEEL THAT MOS GUIDANCE IS TOO WARM OVER MUCH OF THE TIME WITH UPPER LEVEL LOW JUST EAST OF OUR REGION. WILL KEEP HIGHS GENERALLY IN THE MID 70S TO LOWER 80S OVER MUCH OF THE TIME...BUT WE MAY SEE A BIT OF A MODERATION TOWARDS THE MIDDLE OF NEXT WEEK. && .AVIATION /00Z FRIDAY THROUGH TUESDAY/... THOUGH A FEW TERMINALS HAVE LIFTED TO VFR...THIS IS EXPECTED TO BE BRIEF...AND CIGS WILL DROP TO MVFR OVER THE NEXT HOUR OR SO...AND THEN TO IFR BY 04Z. LIFR CONDITIONS THEN EXPECTED THROUGH THE OVERNIGHT...GRADUALLY IMPROVING TO VFR FRI MORNING. SOME OUTLYING AND COASTAL TERMINALS WILL NOT LIFT TO VFR UNTIL EARLY FRI AFTERNOON. L/V WINDS TONIGHT...THEN W-NW WINDS WILL INCREASE TO 5-10 KT DURING THE AFTERNOON. OUTLOOK /00Z SAT THROUGH TUE/... FRI NIGHT THROUGH SAT NIGHT...MVFR-IFR IN HEAVY RAIN AND FOG. SUN-TUE...SUB-VFR FROM TIME TO TIME IN SCT SHOWERS. && .MARINE... SCA REMAINS IN EFFECT FOR THE OCEAN WATERS FOR WINDS GUSTING TO 25 KNOTS AND FOR SEAS 5 FT OR GREATER TONIGHT...THEN MAINLY FOR SEAS ON FRIDAY. OUTLOOK /FRIDAY NIGHT THROUGH TUESDAY/... AN ANOMALOUS VERTICALLY STACKED LOW PRESSURE SYSTEM WILL BE VERY SLOW TO MOVE AWAY FROM THE REGION. THIS MAY RESULT IN NORTHEAST WINDS AND SEAS AT OR ABOVE SCA AT TIMES. && .HYDROLOGY... TONIGHT...THE FLASH FLOOD WATCH HAS BEEN CANCELLED. LOCAL PONDING OF WATER WILL CONTINUE ON AREA ROADWAYS THIS EVENING AND OVERNIGHT ON LONG ISLAND. THE RAIN WILL BE MORE SCATTERED FROM NEW YORK CITY NORTH AND WEST. THE RAHWAY RIVER IN SPRINGFIELD NJ IS AT 4.7 FT WITH FLOOD STAGE OF 5.5 FT. THIS WILL NEED TO BE WATCHED CLOSELY. THE ELIZABETH RIVER CRESTED AT 17.8 FT...FLOOD STAGE THERE IS 20 FT...BUT HAS SINCE COME DOWN TO 17.1 FT. DRIER WEATHER IS EXPECTED FRIDAY ALTHOUGH SCATTERED AFTERNOON SHOWERS ARE STILL POSSIBLE. SATURDAY AND SATURDAY NIGHT... THE POTENTIAL EXISTS FOR HEAVY RAIN AND POSSIBLE FLOODING. HOWEVER...THE AREA OF HEAVIEST RAIN REMAINS A BIT UNCERTAIN SO ITS TOO EARLY FOR A FLOOD WATCH. HOWEVER...LATER SHIFTS WILL CERTAINLY HAVE TO CONSIDER THE POTENTIAL FOR ONE. && .TIDES/COASTAL FLOODING... TONIGHT...TIDES ONLY RUNNING ROUGHLY 0.5 FT ABOVE THE PREDICTED TIDE AT MONTAUK AND 0.8 ABOVE AT KINGS POINT. AM NOT EXPECTING TIDAL FLOODING TONIGHT SINCE WINDS AND SEAS ARE NOT EXPECTED TO INCREASE ANY FURTHER THAN THEY ALREADY ARE. SATURDAY AND SUNDAY... THE POTENTIAL EXISTS FOR SOME MINOR COASTAL FLOODING AT THE TIMES OF HIGH TIDE THIS WEEKEND. VERTICALLY STACKED SYSTEM WILL CREATE A PERSISTENT EAST TO NORTHEAST WIND AND THAT WILL COMBINED WITH A HIGH ASTRONOMICAL TIDE. WILL HAVE TO GET A BETTER FEEL ON THE EXACT TRACK OF THE SYSTEM/TIMING/WIND DIRECTION BEFORE WE CAN SAY MUCH MORE. && .EQUIPMENT... THE TRANSITION FROM THE MICROART UPPER AIR SYSTEM TO THE RADIOSONDE REPLACEMENT SYSTEM (RRS) CONTINUES. THERE WILL NOT BE ANY SOUNDINGS TAKEN UNTIL RRS IS INSTALLED AND OPERATING. ANOTHER MESSAGE WILL BE ISSUED INDICATING THE FIRST OFFICIAL SOUNDING WITH THE RRS...WHICH SHOULD BE BY THE WEEK OF JUNE 22 2009. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...NONE. NY...NONE. NJ...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 6 PM EDT FRIDAY FOR ANZ350-353-355. && AVIATION...MPS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW YORK NY ISSUED BY NATIONAL WEATHER SERVICE TAUNTON MA 427 PM EDT THU JUN 18 2009 CTZ005>012-NJZ002>006-011-NYZ067>081-192030- 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-NEW YORK (MANHATTAN)- BRONX-RICHMOND (STATEN ISLAND)-KINGS (BROOKLYN)-QUEENS-NASSAU- NORTHWESTERN SUFFOLK-NORTHEASTERN SUFFOLK-SOUTHWESTERN SUFFOLK- SOUTHEASTERN SUFFOLK- 427 PM EDT THU JUN 18 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHERN CONNECTICUT...NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY HEAVY RAIN WILL BE POSSIBLE SATURDAY AND SATURDAY NIGHT ACROSS THE REGION. IT IS TOO EARLY TO DETERMINE EXACT AMOUNTS OR WHERE THE HEAVIEST RAIN WILL OCCUR. HOWEVER...THE POTENTIAL IS THERE FOR SOME FLOODING. THERE ALSO MAY BE A FEW EMBEDDED THUNDERSTORMS SATURDAY AND SATURDAY NIGHT...ALTHOUGH SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. IN ADDITION...PERSISTENT EAST TO NORTHEAST WINDS WILL BRING THE CHANCE FOR SOME MINOR COASTAL FLOODING ALONG THE COAST DURING THE TIMES OF HIGH TIDE SATURDAY AND SUNDAY. HOWEVER...THE EXACT TRACK OF THE LOW PRESSURE SYSTEM REMAINS UNCERTAIN SO STAY TUNED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. ANZ330-335-338-340-345-350-353-355-192030- 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- 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- 427 PM EDT THU JUN 18 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF ATLANTIC COASTAL WATERS. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A FEW THUNDERSTORMS ARE POSSIBLE SATURDAY AND SATURDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. FRANK
The Brookhaven radar (KOKX), 67 km away, was scanning. The volume nearest the first event began at 00:31 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain caused many flooded basements and some sewage backups in the Havemeyer Park area of Greenwich.
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, June 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: 181191.