Connecticut, 2003

Flood in Connecticut, December 17 to 18, 2003

December 17 to 18, 2003 · NWS OKX · 1 event in 1 county or zone

As a low pressure system moved northeast toward the region and intensified, bands of heavy rain developed during Wednesday, December 17th. Storm Total Rainfall amounts ranged from 1 to 2 inches in 12 hours.

Where it happened

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.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

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.

What happened

The episode as NWS OKX wrote it up.

As a low pressure system moved northeast toward the region and intensified, bands of heavy rain developed during Wednesday, December 17th. Storm Total Rainfall amounts ranged from 1 to 2 inches in 12 hours. At Meriden, 1.67 inches of rain was measured.Heavy rain and rapid snow melt caused significant runoff that resulted in urban flooding of low lying and poor drainage areas. The Quinnipiac River at Wallingford was at or above its' flood stage of 8.0 feet from around 5:30 pm on December 17th through around 3:35 pm on December 18th. This river crested at 9.02 feet at 10:00 pm on the seventeenth.

What forecasters said that day

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 17, 3:55 PM EST, 1 hour 35 minutes earlier.

Area forecast discussion, Dec 17, 3:55 PM EST, 1 hour 35 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE UPTON NY
355 PM EST WED DEC 17 2003

.SHORT TERM FORECAST UPDATE...

POTENTIAL FOR FLOODING...BASED ON SLIGHTLY LOWER RAINFALL AMOUNTS
THAN PREVIOUSLY FORECAST...AFTER COORDINATING WITH THE NE RIVER
FORECAST CENTER...WE HAVE DECIDED TO CANCEL THE FLOOD WATCH FOR THE
ENTIRE AREA.

ONE HALF TO 1 INCH OF MAINLY RAIN IS FCST UNTIL AROUND 02Z ACROSS SE
CT...BEFORE THE PRECIP CHANGES TO SNOW BEFORE ENDING AROUND 05Z.
ALTHOUGH THIS MAY CAUSE SIGNIFICANT WITHIN BANK RISES IN MANY SMALL
STREAMS...WIDESPREAD FLOODING IS NO LONGER ANTICIPATED.

ACROSS THE LOWER HUDSON VALLEY AND NE NJ...UP TO 1/4 INCH LIQUID
WATER EQUIVALENT...BEFORE THE RAIN CHANGES TO SNOW...IS FORECAST
THROUGH THIS EVENING...UNTIL THE UPSTREAM SHORT WAVE LIFTS NE OF THE
REGION. AGAIN...BECAUSE WIDESPREAD FLOODING IS NOT ANTICIPATED...THE
FLOOD WATCH WILL BE CANCELED.

POTENTIAL FOR FOG...AREAS OF FOG...LOCALLY DENSE...WILL CONTINUE
OVER THE LOW LEVEL TROUGH AXIS FOR A FEW HOURS...UNTIL THE WIND
SHIFT TO THE WEST...WHERE CONDITIONS HAVE BEEN SLOWLY IMPROVING. THE
DENSE FOG ADVISORY HAS EXPIRED AND WILL NOT BE EXTENDED IN AREA OR
TIME.
&&

.DISCUSSION FOR THU...

POTENTIAL FOR HIGH WINDS...ALTHOUGH WINDS WILL BE GUSTY AS STEEP
LAPSE RATES RESULT IN GREATER INSTABILITY DURING THURSDAY...EVEN
WITH A DEEPLY MIXED ATMOSPHERE...SURFACE WIND SPEEDS SHOULD REMAIN
JUST BELOW WIND ADVISORY CRITERIA FOR THE REGION.

BECAUSE LOW LEVEL MOISTURE WILL BE QUITE LIMITED...THE AREAL
COVERAGE OF INSTABILITY SNOW SHOWERS WILL BE LESS THAN WIDELY
SCATTERED. AT THIS TIME...I HAVE DECIDED NOT TO INCLUDE ISOLATED
SNOW SHOWERS IN THE FCST FOR THU AND THU NIGHT.
&&

.DISCUSSION FOR FRI AND SAT...A SERIES OF SHORT WAVES WILL DIG INTO
AND CARVE OUT A HIGH AMPLITUDE TROUGH...RESULTING IN THE FORMATION
OF A SERIES OF ATLANTIC OCEAN STORMS...THE FIRST OF WHICH IS
FORECAST TO DEVELOP INTO A GALE CENTER...REMAINING TOO FAR SOUTH AND
EAST OF THE LOCAL AREA. LETS HOPE THIS FORECAST SOLUTION VERIFIES.
I HAVE NOT MADE ANY MEANINGFUL CHANGES TO THE LONG TERM FORECAST.
&&

.AVIATION....AVIATION...TROF AXIS DRIFTING THROUGH THE NYC METRO
AREA AT THIS TIME AND AS SUCH A LOT OF THE TERMINALS HAVE SEEN THEIR
WINDS DIMINISH SIGNIFICANT AND ACTUALLY BEGIN TO SHIFT TO THE W OR
NW. LOW LEVEL WIND SHEAR THREAT ALSO PULLING OUT TO THE EAST AND AS
SUCH HAVE DELETED THIS MENTION FOR TERMINALS IN THE METRO AREA
WESTWARD. STILL LOOKING FOR SURFACE LOW TO MOVE NE THROUGH CENTRAL
MASSACHUSETTS LATER THIS EVENING. THETA-E RIDGE CURRENTLY POKING IN
ACROSS LONG ISLAND AND CONNECTICUT WILL SHIFT EWD AS WELL SO
PRECIPITATION WILL SCATTER OUT AND END A BIT LATER THIS EVENING.
COULD SEE A CHANGE TO SNOW ACROSS THE INTERIOR IF ENOUGH MOISTURE
LINGERS. CIGS AND VSBY WILL BE A BIT SLOW TO IMPROVE BUT TREND IS
IMPLIED IN THE TAFS. STIFF WINDS DEVELOP IN THE WAKE OF THIS SYSTEM
BUT GUSTS 30 KTS OR LESS EXPECTED.
&&

.MARINE...WILL CONTINUE HEADLINE FOR GALE WARNING TONIGHT AND
THURSDAY FOR THE OCEAN AND SOUND...WITH A SMALL CRAFT ADVISORY ON
THE HARBOR. LOW PRESSURE IS CURRENTLY DEEPENING OVER SOUTHERN NEW
ENGLAND WITH ITS ASSOCIATED COLD FRONT JUST ENTERING THE WESTERN
WATERS. WINDS EAST OF THE FRONT ARE FROM THE SOUTH RUNNING 25 TO 30
KT...ESPECIALLY OVER FAR EASTERN WATERS. TO THE WEST OF THE FRONT
WINDS HAVE SWITCHED TO THE WEST...CURRENTLY RUNNING 15 TO 20 KT. THE
COLD FRONT WILL SWEEP EAST ACROSS ALL WATERS BY MIDNIGHT. AT THE
SAME TIME LOW PRESSURE WILL INTENSIFY AND MOVE NORTH INTO MAINE
OVERNIGHT...WITH A RAPIDLY TIGHTENING PRESSURE GRADIENT FOR
OVERNIGHT INTO THURSDAY. WINDS WILL PICK UP TO GALE CRITERIA
(W30-35KT) AFTER MIDNIGHT ACROSS THE OCEAN AND SOUND. WESTERLY
GALES WILL CONTINUE THURSDAY...AND WITH A GOOD MIXING LAYER EXPECT
GUSTS OF UP TO 4O KT DURING THE DAYLIGHT HOURS ESPECIALLY OVER THE
EASTERN COASTAL WATERS. SEAS ON THE OCEAN ARE CURRENTLY RUNNING 8 TO
11 FT WITH A GOOD SOUTHERLY FETCH...AND EXPECT THEM BUILD TO 12 TO
15 FT OVERNIGHT AND THURSDAY WITH A STRONG WESTERLY WIND...WITH THE
HIGHEST SEAS OVER EASTERN PORTION. SEAS ON THE SOUND ARE CURRENTLY
RUNNING 3 TO 4 FT...AND THEY SHOULD BUILD TO 6 TO 9 FT OVERNIGHT
INTO THURSDAY...WITH AN IDEAL 260 DEGREE WIND TRAJECTORY. BLOWOUT
TIDES MAY BE A PROBLEM OVER COASTAL SECTIONS OF WESTERN WATERS
DURING LOW TIDE ON THURSDAY WITH THE STRONG WESTERLY
GRADIENT...ESPECIALLY OVER THE WESTERN SOUND. THE W/NW GRADIENT WILL
SLOWLY WEAKEN THURSDAY NIGHT AS LOW PRESSURE HEADS WELL NORTH INTO
QUEBEC...ALLOWING CONDITIONS TO FALL BELOW GALE WARNING CRITERIA.
THEREAFTER...HIGH PRESSURE WILL SLOWLY BUILD NORTHEAST INTO THE AREA
FROM THE SOUTH...WITH CONDITIONS SLOWLY FALLING BELOW SMALL CRAFT
CRITERIA LATE FRIDAY INTO THE WEEKEND.
&&

.HYDROLOGY...PLEASE REFER TO THE SHORT TERM FORECAST ABOVE.
&&

.OKX WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
NJ...NONE.
NY...NONE.
MARINE...GALE WARNING FOR ANZ350-353-355-330-335.
         SMALL CRAFT ADVISORY FOR NY HARBOR...ANZ338.

GC
Hazardous weather outlook, Dec 17, 5:32 AM EST, 11 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE UPTON NY
532 AM EST WED DEC 17 2003

CTZ005>012-NJZ002>006-011-NYZ067>076-181122-
BERGEN NJ-BRONX NY-EASTERN PASSAIC NJ-ESSEX NJ-HUDSON NJ-
KINGS (BROOKLYN) NY-NEW YORK (MANHATTAN) NY-NORTHERN FAIRFIELD CT-
NORTHERN MIDDLESEX CT-NORTHERN NEW HAVEN CT-NORTHERN NEW LONDON CT-
NORTHERN WESTCHESTER NY-ORANGE NY-PUTNAM NY-QUEENS NY-
RICHMOND (STATEN IS.) NY-ROCKLAND NY-SOUTHERN FAIRFIELD CT-
SOUTHERN MIDDLESEX CT-SOUTHERN NEW HAVEN CT-SOUTHERN NEW LONDON CT-
SOUTHERN WESTCHESTER NY-UNION NJ-WESTERN PASSAIC NJ-
532 AM EST WED DEC 17 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NEW YORK...
NORTHEAST NEW JERSEY AND SOUTHERN CONNECTICUT.

.DAY ONE...TODAY AND TONIGHT
A FLOOD WATCH IS IN EFFECT FROM THIS MORNING TO LATE TONIGHT. RAIN
WILL SPREAD ACROSS THE REGION THIS MORNING AND WILL BECOME HEAVY AT
TIMES THIS AFTERNOON. RAINFALL TOTALS OF 1 TO 2 INCHES ARE EXPECTED
WITH THIS STORM...WITH LOCALLY HIGHER AMOUNTS OF UP TO 2 1/2 INCHES
POSSIBLE IN SOME SPOTS.

SOME AREA STREAMS AND RIVERS ARE ALREADY RUNNING HIGH...AND THIS
RAINFALL WILL ONCE AGAIN CREATE POSSIBLE FLOODING PROBLEMS. URBAN AND
POOR DRAINAGE FLOODING IS ALSO EXPECTED. SNOW COVER ACROSS INTERIOR
SECTIONS WILL ALSO MELT...COMPOUNDING FLOODING PROBLEMS IN THOSE
AREAS.

.DAYS TWO THROUGH SEVEN...
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED TODAY AND TONIGHT.

NYZ077>081-181122-
NASSAU NY-NORTHEAST SUFFOLK NY-NORTHWEST SUFFOLK NY-
SOUTHEAST SUFFOLK NY-SOUTHWEST SUFFOLK NY-
532 AM EST WED DEC 17 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NEW YORK...
NORTHEAST NEW JERSEY AND SOUTHERN CONNECTICUT.

.DAY ONE...TODAY AND TONIGHT
RAIN WILL SPREAD ACROSS THE REGION THIS MORNING AND WILL BECOME HEAVY
AT TIMES THIS AFTERNOON. RAINFALL TOTALS OF 1 TO 2 INCHES ARE
EXPECTED WITH THIS STORM...WITH LOCALLY HIGHER AMOUNTS OF UP TO 2 1/2
INCHES POSSIBLE IN SOME SPOTS. URBAN AND POOR DRAINAGE FLOODING IS
POSSIBLE THROUGH EARLY TONIGHT.

.DAYS TWO THROUGH SEVEN...
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED TODAY AND TONIGHT.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 flood. Local standard time, as filed.

Flood, Northern New Haven

When
December 17, 5:30 PM EST to December 18, 3:45 PM EST
Where
Northern New Haven forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
41.443, -72.965 (the zone’s center; the record gives no point)

What these are

Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Connecticut in 2003Every state in 2003This day in weather historyWarnings in Connecticut, December 2003

Sources

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: 5329176.