Flood, Somerset
- When
- February 22, 7:37 PM EST to February 26, 4:22 AM EST
- Where
- Somerset forecast zone
- Reported by
- NEWSPAPER
- Coordinates
- 40.564, -74.616 (the zone’s center; the record gives no point)
Flood in New Jersey, February 22 to 26, 2003
A large swath of moderate to heavy rain with embedded thunderstorms moved across central New Jersey during the mid-day on the 22nd. 0 inches.
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
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 PHI wrote it up.
A large swath of moderate to heavy rain with embedded thunderstorms moved across central New Jersey during the mid-day on the 22nd. Rainfall totals averaged up to one half an inch per hour during the thunderstorms and storm totals across the county averaged between 1.5 and 2.0 inches. The combination of the heavy rain and melting snow produced widespread roadway flooding and ponding of water in poor drainage areas as well as some basement flooding. It also produced mainly minor flooding throughout the Raritan River Basin. Flooding along the Millstone River closed the Blackwells Mills and Griggstown Causeways. The latter was closed through the 26th. Flooding along the North Branch of the Raritan River closed Old York Road in Bridgewater and Branchburg Townships. Water from the river crept into backyards in Branchburg. Flooding along the South Branch of the Raritan River closed two additional roads in Branchburg Township. Flooding along the Brady Brook closed Lamington Road in Bedminster Township. Dukes Parkway along the Raritan River in Manville was also closed. Most roads were reopened by the 24th with the exception of the Griggstown Causeway. The Millstone River at Griggstown was above its 9 foot flood stage from 454 p.m. EST on the 22nd through 422 a.m. EST on the 26th. It crested at 13.69 feet at 345 a.m. EST on the 24th. Farther downstream, the Millstone River at Blackwells Mills was above its 9 foot flood stage from 515 p.m. EST on the 23rd through 825 p.m. EST on the 24th. It crested at 9.75 feet at 315 a.m. EST on the 24th. The South Branch of the Raritan River at Stanton was above its 15 foot flood stage from 737 p.m. EST through 1035 p.m. EST on the 22nd. It crested at 15.38 feet at 930 p.m. EST on the 22nd. The main stem of the Raritan River at Manville reached its 14 foot flood stage at 626 a.m. EST on the 23rd, crested at 14.16 feet at 645 a.m. EST on the 23rd and was back within bankfull at 746 a.m. EST on the 23rd. Storm totals included 1.88 inches in North Plainfield and 1.67 inches in Somerville. The low pressure system responsible for the heavy rain developed along the Gulf Coast States on the 21st and moved northeast into the Tennessee Valley the morning of the 22nd and into Pennsylvania the morning of the 23rd. The strongest surge of warm, unstable air preceding its warm front occurred during the day on the 22nd.
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 Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at Feb 22, 4:50 PM EST, 2 hours 47 minutes earlier.
Area forecast discussion, Feb 22, 4:50 PM EST, 2 hours 47 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
450 PM EST SAT FEB 22 2003
FLOODING HAS OCCURRED OVER PORTIONS OF THE FA AWAY FROM THE NWRN
ZONES...MODELS SHOW STILL ANOTHER SHOT AT PCPN OVER MOST IF NOT ALL OF
FA THIS EVENING AND SOME INDICATION THAT INSTAB ALOFT NOT OVER
WITH YET. NOT SEEING MUCH IN THE WAY OF CONVECTION UPSTREAM ON RADAR
EXCEPT FOR SERN COASTAL SECTIONS...BUT WITH MODEL INDICATIONS WILL
CARRY AN EVENING PERIOD OF RAIN (OR DRIZZLE NW) WITH A SLGT CHC OF A
TSTM (EXCEPT NW). THEN MODELS SHOW SOME SHRA ACTIVITY LIKELY AS THE CFP
APPROACHES TOWARD DAYBREAK. ALSO SHOW MORE INSTAB AROUND THAT
TIME...BUT GIVEN TIME OF DAY OPTED TO LEAVE OUT ANY THUNDER. WITH
FLOODING OCCURRING...AND A BIT MORE RAIN EXPECTED...DECIDED TO CONT THE
FLOOD WATCH ALL ZONES...ALTHOUGH IN THE NWRN ZONES THE CHANCE OF
FLOODING IS RELATIVELY MINIMAL.
TMRW OUR DECISION TREE ON WINDS IS COMING UP JUST SHORT OF HIGH WIND
WARNING CRITERIA...BUT WITH A NEG TILT TROF COMING THROUGH AT H5...NEAR
DRY ADIABATIC CONDITIONS IN THE AFTERNOON AND H9 AND H8 WINDS THAT TIME
IN THE AREA OF 55 TO 65 KTS ON THE ETA...AND 3 HR PRES RISES IN EXCESS
OF 6 MB HAVE DECIDED TO KEEP THE WATCH GOING. WILL LET THE MIDNIGHT
SHIFT DECIDE ON THE WARNING/ADVISORY. AM EXPECTING THIS EVENT TO OCCUR
IN THE AFTERNOON...THINK THERE IS TIME FOR A LOOK AT ONE MORE RUN. HAVE
FCST SUSTAINED WINDS JUST INTO THE WARNING CRITERION AND HAVE MENTIONED
HIGHER GUSTS.
AFTER THAT...FCST WAS CLOSE TO CONTINUITY. WINDS EVENTUALLY WILL
DIMINISH SUNDAY NIGHT AND PERHAPS A LTL RADIATING WILL OCCUR UNDER
MAINLY CLEAR SKIES...BUT NOT ENOUGH TO CUT COLDER GUIDANCE. IMPULSE
APPROACHING ON MONDAY DOES NOT LOOK VERY OMINOUS RIGHT NOW. SYSTEM
TOWARD MID TO END OF WORK WEEK LOOKS SIMILAR TO PREV RUN...LOOKING LIKE
MUCH OF THE FA WILL STAY ON THE MILD SIDE OF IT.
FCSTID = 45
MPO 36 39 13 31 / 100 70 0 50
ABE 36 39 19 34 / 100 70 0 40
RDG 36 41 20 36 / 100 70 0 40
PHL 40 46 23 40 / 100 50 0 40
12N 36 39 17 32 / 100 70 0 50
SMQ 38 44 21 37 / 100 70 0 40
TTN 39 45 23 38 / 100 70 0 40
MIV 43 51 18 43 / 100 50 0 40
ACY 44 54 26 43 / 100 50 0 40
ILG 40 46 23 40 / 100 50 0 40
DOV 44 51 22 45 / 100 50 0 40
GED 44 55 22 45 / 100 50 0 40
ESN 44 51 22 45 / 100 50 0 40
.PHI...
DE...HIGH WIND WATCH FOR SUNDAY DEZ001>003.
FLOOD WATCH FOR TONIGHT DEZ001>004.
MD...HIGH WIND WATCH FOR SUNDAY MDZ008-012-015-019>020.
FLOOD WATCH FOR TONIGHT MDZ008-012-015-019>020.
NJ...HIGH WIND WATCH FOR SUNDAY NJZ001-Z007>010-012-013-015>023-027.
FLOOD WATCH FOR TONIGHT NJZ001-007>010-012>027.
PA...HIGH WIND WATCH FOR SUNDAY PAZ054>055-060>062-067>071.
FLOOD WATCH FOR TONIGHT PAZ054>055-060>062-067>071.
MARINE...GALE WARNING ANZ430-431-450>455 AND ADJACENT COASTAL ZONES.
NYYHazardous weather outlook, Feb 22, 5:43 AM EST, 13 hours 54 minutes before
DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ054-055- 060>062-067>071-221245- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 540 AM EST FRI FEB 21 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL AND SOUTHEAST PENNSYLVANIA...DELAWARE...THE NORTHERN MARYLAND EASTERN SHORE...AND NEW JERSEY EXCLUDING THE FIVE NORTHEAST COUNTIES. .DAY ONE...TODAY DENSE FOG WILL LOCALLY LOWER VISIBILITIES TO NEAR ZERO DURING THE MORNING HOURS. A DENSE FOG ADVISORY IS IN EFFECT UNTIL 1100 AM. SEE THE ADVISORY PRODUCT...NPWPHI...FOR ADDITIONAL INFORMATION. A SIGNIFICANT RAIN EVENT IS EXPECTED FOR TODAY AND TONIGHT...AND COMBINED WITH THE WIDESPREAD SNOWPACK...MAY PRODUCE FLOODING PROBLEMS. AS A RESULT A FLOOD WATCH IS IN EFFECT. SEE OUR FLOOD WATCH PRODUCT...FFAPHI...FOR ADDITIONAL INFORMATION. .DAYS TWO THROUGH SEVEN... THE POTENTIAL FOR STRONG DAMAGING WINDS EXISTS ON SUNDAY AS THE MAJOR STORM SYSTEM AFFECTING OUR REGION MOVES UP TOWARD NEW ENGLAND. A HIGH WIND WATCH HAS BEEN ISSUED FOR SUNDAY. SEE THE WATCH PRODUCT...NPWPHI...FOR ADDITIONAL INFORMATION. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BECOME NECESSARY TODAY AND TONIGHT IF FLOOD WARNINGS ARE ISSUED. SZATKOWSKI
The radar
The national radar mosaic for the moment the first event began.
Event by event
1 flood. Local standard time, as filed.
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
- Tornado in Kentucky, February 22, 2003
- Flash Flood and Flooding in Virginia, February 22 to 23, 2003
- Avalanche in Idaho, February 22, 2003
- Tornado and Damaging Winds in Georgia, February 22, 2003
- Winter Weather in Vermont, February 22 to 23, 2003
- Heavy Snow in Ohio, February 22 to 23, 2003
- Heavy Rain in New Jersey, February 22, 2003
- Hail and Damaging Winds in Georgia, February 22 to 23, 2003
- Flooding in West Virginia, February 22 to 23, 2003
- Damaging Winds and Lightning Strike in South Carolina, February 22, 2003
- Flooding and Heavy Rain in Virginia, February 22 to 23, 2003
- Tornado and Hail in Virginia, February 22, 2003
More
Every storm in New Jersey in 2003Every state in 2003This day in weather historyWarnings in New Jersey, February 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: 5347375.