Flooding in New Jersey, April 16 to 22, 2011

Name: Flooding in New Jersey, April 16 to 22, 2011
Start: 2011-04-16T19:40
End: 2011-04-22T04:00
Location: New Jersey

April 16 to 22, 2011 · NWS PHI · 7 events in 7 counties and zones

Where it happened

Every event with a place to put it. 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

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $250,000
Crop damage: None recorded
Events: 7

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.

Heavy rain caused poor drainage flooding in New Jersey and stream and river flooding mainly in west central and northern New Jersey. Major flooding occurred again in sections of the Passaic River Basin. The rain began during the morning of the 16th and fell at its heaviest during thunderstorms on the evening of the 16th. The rain ended during the early morning of the 17th. Precipitation totals averaged 2.0 to 4.0 inches along the Interstate 95 corridor and Morris County and generally 1 to 2 inches elsewhere in New Jersey.

The heavy rain was caused by a deep low pressure system that emerged from the Rockies on the 14th and moved northeast and reached the Great Lakes on the morning of the 16th and then north into Canada that evening. A strong high pressure system preceded it across southeast Canada and both pumped considerable moisture into the region from the Gulf of Mexico and the Atlantic Ocean. The rain ended shortly after the low's occluded front moved through Pennsylvania.

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 Apr 16, 7:13 PM EST, 27 minutes earlier.

Area forecast discussion, Apr 16, 7:13 PM EST, 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
813 PM EDT SAT APR 16 2011

.SYNOPSIS...
A STRONG LOW PRESSURE SYSTEM WILL MOVE ACROSS SOUTHEASTERN CANADA
TONIGHT WITH A SECONDARY LOW MOVING ACROSS THE MID ATLANTIC
REGION. AN ASSOCIATED COLD FRONT WILL SWEEP ACROSS THE AREA
TONIGHT. THE MAIN LOW IS FORECAST TO MOVE INTO NEWFOUNDLAND LATE
SUNDAY AND MONDAY. ANOTHER COLD FRONT LOOKS TO MOVE THROUGH OUR
REGION ON MONDAY NIGHT AND THE BOUNDARY MAY STALL HERE ON TUESDAY.
ANOTHER LOW IS ANTICIPATED TO MOVE ACROSS THE GREAT LAKES ON
TUESDAY NIGHT AND WEDNESDAY PULLING YET ANOTHER COLD FRONT THROUGH
OUR REGION ON WEDNESDAY NIGHT. HIGH PRESSURE SHOULD FOLLOW FOR
THURSDAY AND FRIDAY.

&&

.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
A WARM FRONT IS MOVING INTO OUR FAR SOUTHERN ZONES AS OF 23Z. A
POWERFUL SOUTHERLY LOW-LEVEL JET OF 60 KNOTS AT 2,000 FEET, VIA THE
KDIX VWP, CONTINUES TO ADVECT A LOT OF MOISTURE ACROSS THE AREA.
THE MAIN LIFT WITH THIS IS GRADUALLY SHIFTING EASTWARD ACROSS THE
CWA THIS EVENING, HOWEVER WIDESPREAD MODERATE TO HEAVY RAIN IS
OCCURRING IN THIS CORRIDOR. WE HAVE RECEIVED SOME REPORTS OF POOR
DRAINAGE AND STREET FLOODING. THE BACK EDGE OF THIS STEADY
MODERATE TO HEAVY RAIN IS MOVING INTO EASTERN PENNSYLVANIA ATTM,
HOWEVER A CONVECTIVE LINE IS TO OUR WEST. THE LOW-LEVEL
ENVIRONMENT HAS BEEN STABLE ACROSS OUR AREA DUE TO US BEING NORTH
OF THE WARM FRONT. HOWEVER, THERE HAS BEEN EMBEDDED ELEVATED
CONVECTION OCCURRING. THERE IS PLENTY OF DEEP-LAYER SHEAR GIVEN
THE ROBUST WIND FIELD, HOWEVER INSTABILITY HAS BEEN A LIMITING
FACTOR.

OUR ATTENTION TURNS TO A CONVECTIVE LINE COMING IN FROM THE WEST.
THIS APPEARS TO BE ASSOCIATED WITH THE STRONG THERMAL/FRONTAL
FORCING WITH THE ACTUAL COLD FRONT. ALSO, A SURFACE LOW HAS
DEVELOPED ALONG THE TRIPLE POINT IN NORTHERN VIRGINIA WHICH IS
MOVING EAST-NORTHEASTWARD. THIS IS ALL COMBINING TO PRODUCE A
CONVECTIVE LINE AS ENOUGH INSTABILITY IS BEING REALIZED. SOME
DAMAGING WINDS MAY ACCOMPANY THIS LINE AS IF SLIDES EASTWARD.
GIVEN THE DEEP-LAYER SHEAR, CANNOT RULE OUT A SPIN-UP ALONG THE
LINE ESPECIALLY WITH ANY LEWP OR SMALL BOWING SEGMENTS. WE HAVE
NOTED THAT THE TEMPERATURES AND DEW POINTS ACROSS ESPECIALLY THE
SOUTHERN HALF OF OUR CWA ARE CREEPING UP. THE TORNADO WATCH
PREVIOUSLY ISSUED FOR PARTS OF THE CWA REMAINS IN EFFECT AS WE
AWAIT THE CONVECTIVE LINE. BASED ON THE ENVIRONMENT, WE REMOVED
THE LARGE HAIL MENTION IN THE WATCH AREA AND KEPT THE POTENTIAL
FOR DAMAGING WINDS.

THE STRONG LOW-LEVEL WIND FIELD HAS BEEN LEADING TO GUSTS TO
AROUND 45 MPH ESPECIALLY ACROSS THE SOUTHERN AREAS AND CLOSER TO
THE BAY AND COAST. WE WILL MAINTAIN THE WIND ADVISORY AS IS FOR
NOW.

&&

.SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/...
THE MID LEVEL LOW IS EXPECTED TO PASS ACROSS THE GREAT LAKES
TONIGHT AND SUNDAY MORNING, THEN DOWN THE SAINT LAWRENCE RIVER
VALLEY ON SUNDAY AFTERNOON AND SUNDAY EVENING. A MID LEVEL SHORT
WAVE SHOULD PASS OVER OUR REGION ON SUNDAY EVENING, WITH THE
PATTERN BECOMING ZONAL IN ITS WAKE FOR SUNDAY NIGHT AND MONDAY. A
TROUGH SHOULD DIG OVER THE GREAT PLAINS ON TUESDAY.

WE WILL INDICATE A SLIGHT CHANCE OF SHOWERS IN OUR NORTHERN
COUNTIES FOR LATE SUNDAY IN ASSOCIATION WITH THE SHORT WAVE. THE
1200 UTC NAM WAS ACTUALLY INDICTING LIFTED INDEX VALUES A BIT
BELOW ZERO AT THAT TIME AND CAPE VALUES UP AROUND 400 J/KG. THE
GFS IS LESS UNSTABLE. FOR NOW, WE WILL NOT MENTION ANY THUNDER AND
WE WILL SEE WHAT SUBSEQUENT MODEL GUIDANCE SUGGESTS.

A FRONTAL BOUNDARY FROM THE NORTHWEST IS EXPECTED TO DROP INTO
OUR REGION ON MONDAY AND MONDAY NIGHT. WITHOUT MUCH OF A PUSH
BEHIND IT, THE FRONT SHOULD STALL ON TUESDAY. AS IS COMMON WITH
SUCH FRONTS AT THIS TIME OF THE YEAR, FORECAST CONFIDENCE
REGARDING ITS TIMING AND SOUTHWARD PROGRESS IS RATHER LOW. WE WILL
MENTION A CHANCE OF RAIN, ESPECIALLY FOR OUR NORTHERN AND CENTRAL
COUNTIES.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
THIS TIME FRAME APPEARS TO BE UNSETTLED BUT WILL ALSO FEATURE A
WARM UP AROUND WEDNESDAY. AS THE RIDGING NEAR THE WEST COAST
BREAKS DOWN, THE FLOW IS FORECAST TO BECOME GENERALLY ZONAL ACROSS
THE U.S. THIS MAY THEN TRY TO AMPLIFY SOME TOWARD THE END OF THE
PERIOD AS TROUGHING MAY DIG ACROSS THE WEST AND ALSO THE MIDWEST.
HPC UTILIZED AN EVEN BLEND OF THE GFS/ECMWF THROUGH THURSDAY, THEN
BLENDED IN AN INCREASING PERCENTAGE OF THE ECMWF ENSEMBLE MEAN.
THIS IS TO PARTIALLY CORRECT FOR THE GENERAL FAST BIAS OF THE GFS
AND ITS ENSEMBLE MEMBERS. WE INITIALIZED THE DATABASE WITH HPC
GUIDANCE THAN MADE SOME TWEAKS BASED ON ADDITIONAL COLLABORATION.

BASED ON THE ABOVE, A WARM FRONT IS FORECAST TO BE SITTING MOSTLY
ACROSS OUR SOUTHERN ZONES TUESDAY NIGHT WHICH THEN LIFTS NORTHWARD
WEDNESDAY. THIS WILL PLACE MOST OF THE CWA IN THE WARM SECTOR WITH
A RATHER WARM SOUTHWEST FLOW OCCURRING FOR A TIME WEDNESDAY. THERE
IS SOME UNCERTAINTY WITH THE DEGREE OF SHOWERS OR A PERIOD OF RAIN
BECOMING STRETCHED WEST TO EAST NORTH OF THE WARM FRONT. FOR NOW,
WE KEPT POPS IN THE CHC TO SLIGHT CHC RANGE WITH THE HIGHEST
VALUES ACROSS THE FAR NORTH TUESDAY NIGHT INTO WEDNESDAY, WITH THE
POPS THEN ERODING FROM SOUTH TO NORTH WEDNESDAY MORNING. THIS
PRECIPITATION MAY BE TIED TO ANY CONVECTIVE ACTIVITY WELL TO OUR
WEST AS IT ROLES EASTWARD, SO FOR NOW WE WILL GO WITH SHOWERS
INSTEAD OF RAIN. IN THE WARM SECTOR WEDNESDAY, STRONG WAA IS
FORECAST TO BOOST 850 MB TEMPERATURES TO NEAR +18C. THIS ALONG
WITH AT LEAST SOME SUNSHINE AND INCREASED MIXING SHOULD ALLOW
HIGHS TO NEAR 80 DEGREES SOUTH OF THE WARM FRONT ESPECIALLY FROM
THE I-95 CORRIDOR ON EASTWARD /COOLER ALONG THE COAST THOUGH AS
THE SURFACE WINDS MAY BE TO SOUTHERLY FOR AWHILE/.

AS LOW PRESSURE TRACKS ACROSS SOUTHEASTERN CANADA WEDNESDAY NIGHT
INTO THURSDAY, ITS COLD FRONT SWEEPS THROUGH OUR AREA. GIVEN THE
WARM AIRMASS AHEAD OF THIS BOUNDARY ALONG WITH THE MOISTURE
RETURN, WE WILL CONTINUE TO INCLUDE A CHC OF THUNDER WEDNESDAY
AFTERNOON AND EVENING. AS A STRONG SURFACE HIGH THEN SLIDES ACROSS
SOUTHERN CANADA, IT SHOULD TEND TO BUILD DOWN INTO THE MID
ATLANTIC STATES ALLOWING THE AFOREMENTIONED COLD FRONT TO BE
PUSHED WELL TO OUR SOUTH. A COOLER AIRMASS WILL ACCOMPANY THIS
SURFACE HIGH AND ULTIMATELY WE MAY HAVE A LIGHT ONSHORE FLOW
OCCURRING LATE THURSDAY AND FRIDAY. AS THE SURFACE HIGH SLIDES OFF
THE NEW ENGLAND COAST FRIDAY NIGHT AND SATURDAY, LOW PRESSURE
SHOULD BE QUICKLY MOVING ACROSS THE GREAT LAKES REGION. ITS
ASSOCIATED WARM FRONT WILL BE MAKING ITS WAY INTO OUR AREA
SATURDAY WITH THE CHC OF SHOWERS /OVERRUNNING RAIN?/. WE STARTED
TO INCREASE THE POPS FRIDAY AND CONTINUED THAT SATURDAY. THERE
HOWEVER IS SOME UNCERTAINTY ON THE TIMING ESPECIALLY WITH THE
MOSTLY ZONAL FLOW REGIME, THEREFORE KEPT POPS IN THE LOW CHC
RANGE. AS FOR TEMPERATURES, WE GENERALLY FOLLOWED HPC WITH MAINLY
MINOR TWEAKS.

&&

.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY AND SURROUNDING AREAS.

RAIN MOVED IN FROM THE WEST-SOUTHWEST EARLY THIS AFTERNOON ACROSS
OUR TAF SITES, WITH ASSOCIATED CEILINGS OF AROUND 1000 FEET AND
VSBYS IN THE 2 TO 5 SM RANGE. THESE CONDITIONS WERE EXPECTED TO
PERSIST THROUGH THE MID AFTERNOON HOURS, THEN IMPROVE SLIGHTLY FOR
A COUPLE OF HOUR BEFORE THE NEXT ROUND OF HEAVIER SHOWERS AND
PERHAPS A FEW THUNDERSTORMS MOVE IN WITH THE FRONT DURING THE LATE
AFTERNOON AND EVENING HOURS. HAVE ALSO INCLUDED A WIND SHEAR
ELEMENT IN THE TAFS THROUGH THE EVENING HOURS. HAVE INCLUDED CB
WITH THE TEMPO CLOUD GROUPING IN THE TAFS BUT ANY THUNDERSTORMS
THAT DO DEVELOP SHOULD BE WIDELY SCATTERED. AFTER THE FRONT MOVES
THROUGH LATE THIS EVENING, WINDS WILL TURN OVER TO THE WEST AND
VFR CONDITIONS WILL RETURN. WINDS ARE EXPECTED TO PICK UP AGAIN ON
SUNDAY, BUT WITH HIGH PRESSURE MOVING BACK IN...VFR CONDITIONS
WILL CONTINUE. BOTTOM LINE...FLYING CONDITIONS WILL BE POOR
THROUGH THE EVENING HOURS...THEN THEY WILL GET BETTER.

OUTLOOK...
LATER MONDAY INTO WEDNESDAY, A FRONTAL BOUNDARY IS FORECAST TO
STALL NEAR OR CLOSE TO THE TERMINAL AREA. THIS SHOULD BRING SOME
MVFR CONDITIONS AT TIMES IN ANY PRECIPITATION.

&&

.MARINE...
GALE WARNINGS WILL CONTINUE INTO THE OVERNIGHT HOURS FOR ALL OF
OUR MARINE AREAS. GALE FORCE GUSTS IN THE 40 TO 45 KT RANGE SHOULD
PEAK THIS EVENING AND THEN SLOWLY DECREASE LATER TONIGHT. SMALL
CRAFT ADVISORY WINDS SHOULD THEN CONTINUE IN THE WESTERLY FLOW ALL
AREAS INTO SUNDAY BEFORE FALLING BELOW CRITERIA SUNDAY NIGHT.
SMALL CRAFT ADVISORY CONDITIONS DUE TO SEAS MIGHT PERSIST INTO
SUNDAY NIGHT ON THE OCEAN WATERS.

A FRONTAL BOUNDARY IS THEN FORECAST TO SETTLE OVER OR NEAR OUR
AREA WATERS LATER MONDAY INTO WEDNESDAY. RIGHT NOW IT LOOKS AS
THOUGH WINDS SHOULD REMAIN BELOW SMALL CRAFT ADVISORY CRITERIA,
ALTHOUGH SOUTHERLY SWELLS OF SMALL CRAFT ADVISORY CRITERIA
GENERATED SOUTH OF THIS BOUNDARY MIGHT EFFECT OUR OCEAN WATERS
TUESDAY INTO WEDNESDAY.

&&

.HYDROLOGY...
THE BEST LIFT AND THE HEAVIEST RAIN ARE ANTICIPATED ALONG AND
JUST AHEAD OF THE FRONTAL BOUNDARY. PRECIPITABLE WATER VALUES ARE
EXPECTED TO APPROACH 1.5 INCHES THIS EVENING.

THE 1200 UTC NAM IS GIVING US ABOUT AN INCH OF RAIN NEAR THE
COAST AND CLOSE TO 2.5 INCHES IN THE LEHIGH VALLEY, THE POCONOS
AND NORTHWESTERN NEW JERSEY. THE 1200 UTC GFS IS ABOUT A QUARTER
INCH LOWER THAN THE 1200 UTC NAM. THE 1200 UTC ECMWF FAVORS THE
GFS NEAR THE COAST BUT IS ONLY NEAR 1.5 INCHES IN OUR NORTHERN
COUNTIES. BASED ON A MODEL CONSENSUS AND GUIDANCE FROM HPC, WE
WILL CONTINUE TO FORECAST RAINFALL AMOUNTS OF 1 TO 2 INCHES IN OUR
REGION, FOLLOWING A RAINFALL PATTERN SIMILAR TO THAT OF THE 1200
UTC GFS. AS A RESULT, THE FLOOD WATCH WILL BE LEFT IN PLACE FOR
NORTHERN DELAWARE, EASTERN PENNSYLVANIA AND NORTHERN NEW JERSEY.

THE MAIN STEM RIVERS SHOULD EASILY BE ABLE TO HANDLE THE EXPECTED
RAINFALL AMOUNTS, AS SHOULD MOST OF THE LARGER STREAMS AND CREEKS.
IT SEEMS AS THOUGH THE MOST LIKELY SPOTS THAT MAY FLOOD IN THIS
EVENT ARE SMALL STREAMS AND AREAS OF POOR DRAINAGE. ROADWAY FLOODING
IS ALSO ANTICIPATED AS SOME STORM DRAINS MAY NOT BE ABLE TO
HANDLE THE VOLUME OF RAINWATER IN THE HEAVY DOWNPOURS.

&&

.TIDES/COASTAL FLOODING...
WITH A STRONG SOUTHEASTERLY WIND, WE/RE CONCERNED THAT MINOR
TIDAL FLOODING MAY OCCUR IN THE UPPER REACHES OF THE CHESAPEAKE
BAY WITH THE HIGH TIDE LATE THIS AFTERNOON AND EARLY THIS EVENING.
HIGH TIDE HAS ALREADY OCCURRED AT CAMBRIDGE, BUT DOESN/T OCCUR
UNTIL AROUND 6 PM AT TOLCHESTER BEACH AND A LITTLE LATER FURTHER
NORTH. ANY FLOODING THAT DOES OCCUR IN THE NORTHERN AREAS OF THE
CHESAPEAKE BAY THIS EVENING WILL BE MINOR, BUT IT STILL NEEDS TO
BE MENTIONED. A COASTAL FLOOD ADVISORY HAS THEREFORE BEEN ISSUED
FOR THIS AREA. RENEWED MINOR FLOODING IS POSSIBLE ON THE
CHESAPEAKE BAY FOR THE NEXT HIGH TIDE LATE TONIGHT AND SUNDAY
MORNING. IF THE WIND DIRECTION CHANGES A LITTLE FASTER THAN
EXPECTED, MAYBE FLOODING WON/T BE A PROBLEM, BUT JUST TOO SOON TO
TELL SO THE ADVISORIES WILL BE LEFT AS IS UNTIL WE GET A BETTER
HANDLE ON THE METEOROLOGY.

THE COASTAL FLOOD WARNING CONTINUES FOR THIS EVENINGS/NIGHTTIME
HIGH TIDE CYCLE FOR THE ATLANTIC COAST, OUR PART OF RARITAN BAY,
DELAWARE BAY AND TIDAL SECTIONS OF THE DELAWARE RIVER. THIS SYSTEM
HAS SIMILARITIES IN STRENGTH AND STRUCTURE TO THE DECEMBER 1, 2010
EVENT IN WHICH THE HIGH TIDE DEPARTURES AVERAGED AROUND 2 FEET,
SLIGHTLY HIGHER IN THE DELAWARE RIVER. THE HIGH ASTRONOMICAL TIDES
ASSOCIATED WITH THE UPCOMING FULL MOON AND THE POORLY TIMED
COINCIDENTAL HIGHER OF THE TWO DAILY ASTRONOMICAL TIDES HAVE
INCREASED THE RISK. THE EASTERLY FLOW VEERING TO THE SOUTHEAST
WOULD PLACE THE GREATEST RISK FOR MODERATE TIDAL FLOODING IN
DELAWARE BAY AND TIDAL SECTIONS OF THE DELAWARE RIVER. IF THE
WINDS VEER TO THE SOUTHEAST SOONER, THE LEAST CHANCE WOULD BE
TOWARD NYC IN RARITAN BAY AND NORTH COASTAL NEW JERSEY. OUR LOCAL
STUDY PROCEDURE IS FORECASTING TIDAL DEPARTURES CLOSE TO 2.0 FEET
ABOVE NORMAL WHICH FOR MOST PLACES IS BORDERLINE BETWEEN MINOR AND
MODERATE TIDAL FLOODING THRESHOLDS. THE EXCEPTION IS UPPER
DELAWARE BAY WHERE WE WOULD CLEARLY BE IN THE MODERATE TIDAL
FLOODING CATEGORY AND LIKELY ALSO THE DELAWARE RIVER.

THIS WILL BE A ONE TIDE CYCLE EVENT AS WINDS WILL SHIFT TO THE
WEST BY THE TIME OF THE NEXT HIGH TIDE CYCLE. THE WINDS WILL COME
CLOSE TO SHIFTING IN THE DELAWARE RIVER AS THE HIGH TIDE CYCLE IS
OCCURRING TONIGHT WHICH CERTAINLY WOULD HELP. |

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...FLOOD WATCH UNTIL 5 AM EDT SUNDAY FOR PAZ054-055-060>062-
     067>071.
     WIND ADVISORY UNTIL 11 PM EDT THIS EVENING FOR PAZ054-055-
     060>062.
     WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR PAZ067>071.
     COASTAL FLOOD WARNING UNTIL 3 AM EDT SUNDAY FOR PAZ070-071.
NJ...FLOOD WATCH UNTIL 5 AM EDT SUNDAY FOR NJZ001-007>010-012-015.
     WIND ADVISORY UNTIL 11 PM EDT THIS EVENING FOR NJZ001-007-008.
     WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR NJZ009-010-
     012>027.
     COASTAL FLOOD WARNING UNTIL MIDNIGHT EDT TONIGHT FOR
     NJZ012>014-020>027.
     COASTAL FLOOD WARNING UNTIL 3 AM EDT SUNDAY FOR NJZ016>019.
DE...FLOOD WATCH UNTIL 5 AM EDT SUNDAY FOR DEZ001.
     WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR DEZ001>004.
     COASTAL FLOOD WARNING UNTIL MIDNIGHT EDT TONIGHT FOR
     DEZ002>004.
     COASTAL FLOOD WARNING UNTIL 3 AM EDT SUNDAY FOR DEZ001.
MD...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR MDZ008-012-015-
     019-020.
     COASTAL FLOOD ADVISORY UNTIL 10 PM EDT THIS EVENING FOR MDZ008-
     012-015-019-020.
     COASTAL FLOOD ADVISORY FROM 2 AM TO 10 AM EDT SUNDAY FOR
     MDZ008-012-015-019-020.
MARINE...GALE WARNING UNTIL 6 AM EDT SUNDAY FOR ANZ450>455.
     GALE WARNING UNTIL 2 AM EDT SUNDAY FOR ANZ430-431.

&&

SYNOPSIS...GORSE/IOVINO
NEAR TERM...GORSE
SHORT TERM...IOVINO
LONG TERM...GORSE
AVIATION...MIKETTA
MARINE...MIKETTA
HYDROLOGY...IOVINO
TIDES/COASTAL FLOODING...MIKETTA

Hazardous weather outlook, Apr 16, 3:45 PM EST, 3 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
445 PM EDT SAT APR 16 2011

NJZ001-007-008-PAZ054-055-061-062-172100-
SUSSEX-WARREN-MORRIS-CARBON-MONROE-LEHIGH-NORTHAMPTON-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW JERSEY...EAST
CENTRAL PENNSYLVANIA AND NORTHEAST PENNSYLVANIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WIND ADVISORY.
   FLOOD WATCH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

NJZ009-010-015-PAZ068-069-172100-
HUNTERDON-SOMERSET-MERCER-MONTGOMERY-BUCKS-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY...NORTHERN
NEW JERSEY...NORTHWEST NEW JERSEY AND SOUTHEAST PENNSYLVANIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WIND ADVISORY.
   FLOOD WATCH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

DEZ003-004-NJZ013-014-020-022>027-172100-
INLAND SUSSEX-DELAWARE BEACHES-WESTERN MONMOUTH-EASTERN MONMOUTH-
OCEAN-ATLANTIC-CAPE MAY-ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-
COASTAL OCEAN-SOUTHEASTERN BURLINGTON-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...COASTAL FLOOD WARNING IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN DELAWARE...CENTRAL
NEW JERSEY AND SOUTHERN NEW JERSEY.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WIND ADVISORY.
   COASTAL FLOOD WARNING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

DEZ001-PAZ070-172100-
NEW CASTLE-DELAWARE-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TORNADO WATCH 152 IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...
...COASTAL FLOOD WARNING IN EFFECT FROM 10 PM THIS EVENING TO 3 AM
EDT SUNDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN DELAWARE AND
SOUTHEAST PENNSYLVANIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   TORNADO WATCH.
   WIND ADVISORY.
   FLOOD WATCH.
   COASTAL FLOOD WARNING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

DEZ002-NJZ021-172100-
KENT-CUMBERLAND-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TORNADO WATCH 152 IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...COASTAL FLOOD WARNING IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE AND SOUTHERN
NEW JERSEY.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   TORNADO WATCH.
   WIND ADVISORY.
   COASTAL FLOOD WARNING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

PAZ071-172100-
PHILADELPHIA-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...
...COASTAL FLOOD WARNING IN EFFECT FROM 10 PM THIS EVENING TO 3 AM
EDT SUNDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST PENNSYLVANIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WIND ADVISORY.
   FLOOD WATCH.
   COASTAL FLOOD WARNING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

MDZ008-012-015-019-020-172100-
CECIL-KENT MD-QUEEN ANNES-TALBOT-CAROLINE-
445 PM EDT SAT APR 16 2011

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING...
...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TORNADO WATCH 152 IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...COASTAL FLOOD ADVISORY IN EFFECT FROM 2 AM TO 10 AM EDT SUNDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MARYLAND.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   TORNADO WATCH.
   WIND ADVISORY.
   COASTAL FLOOD ADVISORY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   COASTAL FLOOD ADVISORY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

NJZ016-017-172100-
SALEM-GLOUCESTER-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TORNADO WATCH 152 IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...COASTAL FLOOD WARNING IN EFFECT FROM 10 PM THIS EVENING TO 3 AM
EDT SUNDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN NEW JERSEY.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   TORNADO WATCH.
   WIND ADVISORY.
   COASTAL FLOOD WARNING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

NJZ012-172100-
MIDDLESEX-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...
...COASTAL FLOOD WARNING IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW JERSEY.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WIND ADVISORY.
   FLOOD WATCH.
   COASTAL FLOOD WARNING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

NJZ018-019-172100-
CAMDEN-NORTHWESTERN BURLINGTON-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...COASTAL FLOOD WARNING IN EFFECT FROM 10 PM THIS EVENING TO 3 AM
EDT SUNDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN NEW JERSEY.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WIND ADVISORY.
   COASTAL FLOOD WARNING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

PAZ060-172100-
BERKS-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...TORNADO WATCH 152 IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL PENNSYLVANIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   TORNADO WATCH.
   WIND ADVISORY.
   FLOOD WATCH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

PAZ067-172100-
CHESTER-
445 PM EDT SAT APR 16 2011

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TORNADO WATCH 152 IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST PENNSYLVANIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   TORNADO WATCH.
   WIND ADVISORY.
   FLOOD WATCH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

ANZ450>455-172100-
COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM-
COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20 NM-
COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20 NM-
COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM-
COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM-
COASTAL WATERS FROM CAPE HENLOPEN TO FENWICK ISLAND DE OUT 20 NM-
445 PM EDT SAT APR 16 2011

...GALE WARNING IN EFFECT UNTIL 6 AM EDT SUNDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS.

.DAY ONE...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...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

ANZ430-172100-
DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE-
445 PM EDT SAT APR 16 2011

...GALE WARNING IN EFFECT UNTIL 2 AM EDT SUNDAY...
...TORNADO WATCH 152 IN EFFECT UNTIL 11 PM EDT THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR DELAWARE BAY WATERS.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   TORNADO WATCH.
   GALE WARNING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

ANZ431-172100-
DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE-
445 PM EDT SAT APR 16 2011

...GALE WARNING IN EFFECT UNTIL 2 AM EDT SUNDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR DELAWARE BAY WATERS.

.DAY ONE...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...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

In the hours before

Special weather statement, Apr 16, 3:24 PM EST, 4 hours 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
424 PM EDT SAT APR 16 2011

DEZ001>004-MDZ008-012-015-019-020-NJZ016-017-021-PAZ067-070-
162230-
NEW CASTLE-KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-KENT MD-
QUEEN ANNES-TALBOT-CAROLINE-SALEM-GLOUCESTER-CUMBERLAND-CHESTER-
DELAWARE-
INCLUDING THE CITIES OF...WILMINGTON...DOVER...GEORGETOWN...
REHOBOTH BEACH...ELKTON...CHESTERTOWN...CENTREVILLE...EASTON...
DENTON...PENNSVILLE...GLASSBORO...MILLVILLE...WEST CHESTER...
MEDIA
424 PM EDT SAT APR 16 2011

...SCATTERED THUNDERSTORMS DEVELOPING...

SCATTERED THUNDERSTORMS WERE DEVELOPING OVER THE DELMARVA
PENINSULA AND SOUTHEASTERN PENNSYLVANIA THIS AFTERNOON. THESE
THUNDERSTORMS WILL MOVE NORTHEAST QUICKLY, AND SOME SHOULD
MAINTAIN THEMSELVES AS THEY MOVE INTO SOUTHERN NEW JERSEY. THEY
WERE GENERATING DANGEROUS CLOUD TO GROUND LIGHTNING AND HEAVY
DOWNPOURS THAT MAY RESULT IN PONDING OF WATER. A FEW MAY GENERATE
SMALL HAIL.

PLEASE DO NOT TRY TO DRIVE ACROSS ANY FLOODED ROADS. IF YOU ARE
OUTDOORS AND HEAR THUNDER, PLEASE MOVE INDOORS.

NJZ009-010-012>015-018>020-022>027-PAZ060-061-068-069-071-162230-
HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH-EASTERN MONMOUTH-
MERCER-CAMDEN-NORTHWESTERN BURLINGTON-OCEAN-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-BERKS-LEHIGH-MONTGOMERY-BUCKS-
PHILADELPHIA-
INCLUDING THE CITIES OF...FLEMINGTON...SOMERVILLE...
NEW BRUNSWICK...FREEHOLD...SANDY HOOK...TRENTON...CAMDEN...
CHERRY HILL...MOORESTOWN...MOUNT HOLLY...JACKSON...HAMMONTON...
CAPE MAY COURT HOUSE...OCEAN CITY...ATLANTIC CITY...
LONG BEACH ISLAND...WHARTON STATE FOREST...READING...ALLENTOWN...
NORRISTOWN...DOYLESTOWN...PHILADELPHIA
424 PM EDT SAT APR 16 2011

...SCATTERED THUNDERSTORMS DEVELOPING...

SCATTERED THUNDERSTORMS WERE DEVELOPING OVER THE DELMARVA
PENINSULA AND SOUTHEASTERN PENNSYLVANIA THIS AFTERNOON. THESE
THUNDERSTORMS WILL MOVE NORTHEAST QUICKLY, AND A FEW MAY MAINTAIN
THEMSELVES AS THEY MOVE INTO THE LEHIGH VALLEY, CENTRAL AND
NORTHERN NEW JERSEY BETWEEN 500 AND 530 PM. THEY WERE GENERATING
DANGEROUS CLOUD TO GROUND LIGHTNING AND HEAVY DOWNPOURS THAT MAY
RESULT IN PONDING OF WATER.

PLEASE DO NOT TRY TO DRIVE ACROSS ANY FLOODED ROADS. IF YOU ARE
OUTDOORS AND HEAR THUNDER, PLEASE MOVE INDOORS.

MPD

Special weather statement, Apr 16, 5:02 PM EST, 2 hours 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
602 PM EDT SAT APR 16 2011

DEZ001>004-MDZ008-012-015-019-020-NJZ016-017-021-PAZ060-067-070-
170000-
NEW CASTLE-KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-KENT MD-
QUEEN ANNES-TALBOT-CAROLINE-SALEM-GLOUCESTER-CUMBERLAND-BERKS-
CHESTER-DELAWARE-
INCLUDING THE CITIES OF...WILMINGTON...DOVER...GEORGETOWN...
REHOBOTH BEACH...ELKTON...CHESTERTOWN...CENTREVILLE...EASTON...
DENTON...PENNSVILLE...GLASSBORO...MILLVILLE...READING...
WEST CHESTER...MEDIA
602 PM EDT SAT APR 16 2011

...THUNDERSTORMS OVER THE DELMARVA AND EASTERN PENNSYLVANIA MOVING
EAST...

RAIN AND EMBEDDED THUNDERSTORMS WERE MOVING FROM THE MARYLAND
EASTERN SHORE AND EASTERN PENNSYLVANIA INTO DELAWARE AND SOUTHERN
NEW JERSEY LATE THIS AFTERNOON. THE THUNDERSTORMS WERE GENERATING
VERY HEAVY DOWNPOURS THAT WERE DROPPING OVER AN INCH OF RAIN IN AN
HOUR. SOME RESULTING POOR DRAINAGE FLOODING MAY OCCUR. THE
THUNDERSTORMS ALSO WERE GENERATING DANGEROUS CLOUD TO GROUND
LIGHTNING. WIND GUSTS UP TO 45 MPH WERE OCCURRING BOTH IN AND
OUTSIDE OF THUNDERSTORMS.

IF YOU ARE DRIVING AND ENCOUNTER FLOODED ROADS, PLEASE DO NOT TRY
TO DRIVE THROUGH THE WATER. IF YOU ARE OUTDOORS AND HEAR THUNDER,
PLEASE MOVE INDOORS.

NJZ001-007>010-012>015-018>020-022>027-PAZ054-055-061-062-068-069-
071-170000-
SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-
WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-CARBON-MONROE-LEHIGH-NORTHAMPTON-
MONTGOMERY-BUCKS-PHILADELPHIA-
INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...
FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...FREEHOLD...SANDY HOOK...
TRENTON...CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY...
JACKSON...HAMMONTON...CAPE MAY COURT HOUSE...OCEAN CITY...
ATLANTIC CITY...LONG BEACH ISLAND...WHARTON STATE FOREST...
JIM THORPE...STROUDSBURG...ALLENTOWN...BETHLEHEM...EASTON...
NORRISTOWN...DOYLESTOWN...PHILADELPHIA
602 PM EDT SAT APR 16 2011

...THUNDERSTORMS OVER THE DELMARVA AND EASTERN PENNSYLVANIA MOVING
EAST...

RAIN AND EMBEDDED THUNDERSTORMS WERE MOVING FROM THE MARYLAND
EASTERN SHORE AND EASTERN PENNSYLVANIA INTO DELAWARE AND SOUTHERN
NEW JERSEY LATE THIS AFTERNOON. THE THUNDERSTORMS WERE GENERATING
VERY HEAVY DOWNPOURS THAT WERE DROPPING OVER AN INCH OF RAIN IN AN
HOUR. SOME RESULTING POOR DRAINAGE FLOODING MAY OCCUR. THE
THUNDERSTORMS ALSO WERE GENERATING DANGEROUS CLOUD TO GROUND
LIGHTNING. WIND GUSTS UP TO 45 MPH WERE OCCURRING BOTH IN AND
OUTSIDE OF THUNDERSTORMS.

ALTHOUGH THE THUNDERSTORMS WERE EXPECTED TO WEAKEN SOMEWHAT AS
THEY MOVE INTO NORTHEAST PENNSYLVANIA, NORTHERN, CENTRAL AND
COASTAL NEW JERSEY, A FEW MAY PERSIST ACROSS THE AREA.

IF YOU ARE DRIVING AND ENCOUNTER FLOODED ROADS, PLEASE DO NOT TRY
TO DRIVE THROUGH THE WATER. IF YOU ARE OUTDOORS AND HEAR THUNDER,
PLEASE MOVE INDOORS.

MPD

Special weather statement, Apr 16, 7:00 PM EST, 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
800 PM EDT SAT APR 16 2011

DEZ001>004-MDZ008-012-015-019-020-NJZ007-009-010-012>027-PAZ054-
055-060>062-067>071-170300-
NEW CASTLE-KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-KENT MD-
QUEEN ANNES-TALBOT-CAROLINE-WARREN-HUNTERDON-SOMERSET-MIDDLESEX-
WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA-
INCLUDING THE CITIES OF...WILMINGTON...DOVER...GEORGETOWN...
REHOBOTH BEACH...ELKTON...CHESTERTOWN...CENTREVILLE...EASTON...
DENTON...WASHINGTON...FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...
FREEHOLD...SANDY HOOK...TRENTON...PENNSVILLE...GLASSBORO...
CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY...JACKSON...
MILLVILLE...HAMMONTON...CAPE MAY COURT HOUSE...OCEAN CITY...
ATLANTIC CITY...LONG BEACH ISLAND...WHARTON STATE FOREST...
JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...
WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA
800 PM EDT SAT APR 16 2011

...RAIN WITH EMBEDDED THUNDERSTORMS CONTINUE...

RAIN WITH EMBEDDED THUNDERSTORMS COVERED MOST OF EASTERN
PENNSYLVANIA, THE DELMARVA PENINSULA, AND NEW JERSEY THIS EVENING.
THE THUNDERSTORMS WERE CAUSING HEAVY RAIN AND DANGEROUS CLOUD TO
GROUND LIGHTNING. SOME FLOODING HAS BEEN REPORTED THROUGHOUT THE
AREA AS RAINFALL AMOUNTS WERE EXCEEDING TWO INCHES AT SOME
LOCATIONS. WINDS CONTINUED TO GUST TO AROUND 45 MPH BOTH IN AND
OUT OF THUNDERSTORMS.

THE RAIN AND THUNDERSTORMS WILL VERY GRADUALLY BECOME MORE
SCATTERED THROUGH THE COURSE OF THE EVENING, WITH THIS PROCESS
DEVELOPING FROM THE WEST.

PLEASE DO NOT DRIVE THROUGH FLOODED AREAS. IF YOU HEAR THUNDER AND
ARE OUTDOORS, PLEASE MOVE INDOORS.

MPD

Special weather statement, Apr 16, 7:30 PM EST, 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
830 PM EDT SAT APR 16 2011

DEZ003-170100-
INLAND SUSSEX DE-
830 PM EDT SAT APR 16 2011

...STRONG THUNDERSTORMS WILL AFFECT SUSSEX COUNTY...

AT 825 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
AREA OF STRONG THUNDERSTORMS ABOUT 10 MILES NORTH OF
SALISBURY...MOVING NORTHEAST AT 45 MPH. THE THUNDERSTORMS WILL BE
NEAR SYCAMORE AND SEAFORD AROUND 840 PM...GEORGETOWN AROUND 850 PM
AND ELLENDALE AROUND 900 PM.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THESE STORM.

EXPECT DANGEROUS CLOUD TO GROUND LIGHTNING FROM THE STORMS. DO NOT
SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

LAT...LON 3846 7570 3847 7571 3859 7572 3890 7548
      3892 7541 3895 7539 3895 7533 3894 7530
      3893 7530 3889 7525 3882 7519 3845 7554

MPD

The radar

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

Open the radar archive at this moment

Event by event

7 flood. Local standard time, as filed.

Flood, Morris

When: April 16, 7:40 PM EST to April 22, 4:00 AM EST
Where: Morris County, Green Pond to 0.63 mi SE of Netcong
Cause: Heavy Rain
Property damage: $250,000
Reported by: Newspaper
Coordinates: 41.020, -74.480

Heavy rain caused poor drainage and river flooding in Morris County. Moderate to major flooding occurred along the Passaic and Pompton Rivers, although the crests were not as high as they were in March. The renewed flooding along the Pompton and Passaic Rivers forced the evacuations of 10 residents in Lincoln Park and three families in Pequannock. About 100 homeowners in Pequannock were told to evacuate. About 30 homes were damaged by the Pompton River within the township. New Jersey State Route 23 was also closed in Pequannock.

The Passaic River at Chatham was above its 6 foot flood stage from 1028 p.m. EDT on the 16th through 322 a.m. EDT on the 17th. It crested at 6.34 feet at 100 a.m. EDT on the 17th. Farther downstream, the Passaic River at Pine Brook was above its 19 foot flood stage from 500 p.m. EDT on the 17th through 915 p.m. EDT on the 20th. It crested at 20.09 feet at 1245 a.m. EDT on the 19th. Farther downstream, the Passaic River at Circle Burners or Lincoln Park was above its 6 foot flood stage from about 2 p.m. EDT on the 18th through 5 a.m. EDT on the 22nd. It crested at 8.33 feet at 1140 p.m. EDT on the 18th.

The Pompton River at Pompton Plains was above its 16 foot flood stage from 207 a.m. EDT on the 17th through 535 p.m. EDT on the 18th. It crested at 19.84 feet at 130 p.m.EDT on the 17th. Farther downstream, the Pompton River at Ryerson Road was above its 12 foot flood stage from 357 a.m. EDT on the 17th through 917 p.m. EDT on the 20th. It crested at 16.41 feet at 1020 p.m. EDT on the 17th. Farther downstream, the Pompton River at Midwood was above its 7.5 foot flood stage from 335 a.m. EDT on the 17th through 122 a.m. EDT on the 22nd. It crested at 12.40 feet at 1205 a.m. EDT on the 18th. Farther downstream, the Pompton River at the Mountainview Bridge was above its 8 foot flood stage from 1017 a.m. EDT on the 17th through 921 a.m. EDT on the 21st. It crested at 10.84 feet at 250 a.m. EDT on the 18th. | |The East Ditch at Beaver Brook Road was above its 2.5 foot flood stage from 840 p.m. EDT on the 16th through 823 p.m. EDT on the 17th. It crested at 4.18 feet at 450 a.m. EDT on the 17th. The Rockaway River above the Boonton Reservoir was above its 5 foot flood stage from 251 a.m. EDT on the 17th through 825 a.m. EDT on the 18th. It crested at 6.23 feet at 11 a.m. EDT on the 17th. The Rockaway River below the Boonton Reservoir was above its 5 foot flood stage from 618 a.m. EDT on the 17th through 222 a.m. EDT on the 19th. It crested at 6.75 feet at 430 p.m. EDT on the 17th. The Whippany Creek at Morristown was above its 6 foot flood stage from 1208 a.m. EDT through 707 am EDT on the 17th. It crested at 6.2 feet at 1230 a.m. EDT on the 17th. The Pequannock River at the Macopin Dam was above its 5.5 foot flood stage from 1218 a.m. EDT on the 17th through 1007 a.m. EDT on the 18th. It crested at 5.73 feet at 745 a.m. EDT on the 17th.

Event precipitation totals included 3.82 inches in Butler, 3.81 inches in Milton, 3.60 inches in Rockaway, 3.26 inches in Morris, 3.14 inches in Chatham, 3.10 inches in Harding, 3.09 inches in Denville, 2.91 inches in Mine Hill and Randolph, 2.90 inches in Long Valley, 2.88 inches in Boonton and 2.84 inches in Long Hill.

Flood, Somerset

When: April 16, 8:58 PM EST to April 19, 4:22 AM EST
Where: Somerset County, North Plainfield to Bernardsville
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.620, -74.470

The heavy rain caused poor drainage flooding as well as minor to moderate flooding along numerous streams and rivers in Somerset County. Mainly moderate flooding occurred along both the Millstone and Raritan Rivers. Major flooding occurred along the Millstone River at Griggstown. Early in the morning on the 17th, in Hillsborough Township, a man had to be rescued after he drove into four feet of water at the Basilone Memorial Bridge which crosses the Raritan River.

The North Branch of the Raritan River at North Branch was above its 12.3 foot flood stage from 106 a.m. EDT through 851 a.m. EDT on the 17th. It crested at 14.40 feet at 515 a.m. EDT. Farther downstream, the North Branch of the Raritan River at Raritan was above its 10 foot flood stage from 230 a.m. EDT through 1005 a.m. EDT on the 17th. It crested at 11.15 feet at 630 a.m. EDT. The South Branch of the Raritan River at South Branch was above its 7 foot flood stage from 958 p.m. EDT on the 16th through 252 p.m. EDT on the 17th. It crested at 11.55 feet at 515 a.m. EDT on the 17th. Along the main stem of the Raritan River at Manville, the river was above its 14 foot flood stage from 428 a.m. EDT through 712 p.m. EDT on the 17th. It crested at 17.25 feet at 11 a.m. EDT. Farther downstream, the Raritan River at Bound Brook was above its 28 foot flood stage from 754 a.m. through 1040 p.m. EDT on the 17th. It crested at 31.1 feet at 230 p.m. EDT.

The Millstone River at Griggstown had major flooding and was above its 10 foot flood stage from 1144 p.m. EDT on the 16th through 522 a.m. EDT on the 19th. It crested at 15.67 feet at 330 p.m. EDT on the 17th. Farther downstream, the Millstone River at Blackwells Mills was above its 9 foot flood stage from 544 a.m. EDT on the 17th through 337 p.m. EDT on the 18th. It crested at 12.59 feet at 4 p.m. EDT on the 17th. Farther downstream, the Millstone River at Weston was above its 12.4 foot flood stage from 811 a.m. EDT through 739 p.m. EDT on the 17th. It crested at 13.82 feet at 1245 p.m. EDT on the 17th. The Pike Run at Belle Mead was above its 7 foot flood stage from 1013 p.m. EDT on the 16th through 448 a.m. EST on the 17th. It crested at 8.87 feet at 115 a.m. EDT on the 17th. The Bound Brook at Middlesex (Middlesex County) was above its 9 foot flood stage from 413 a.m. EDT through 740 a.m. EDT on the 17th. It crested at 9.27 feet at 6 a.m. EDT.

Event precipitation totals included 3.48 inches in Neshanic, 3.00 inches in Martinsville, 2.91 inches in Hillsborough and Bernards, 2.90 inches in Bound Brook, 2.76 inches in Skillman, 2.74 inches in Franklin, 2.68 inches in Montgomery, 2.49 inches in Bridgewater, 2.37 inches in Somerville and 2.25 inches in Blackwells Mills.

Flood, Mercer

When: April 16, 11:09 PM EST to April 17, 7:42 AM EST
Where: Mercer County, 1.06 mi SW of East Trenton to 0.23 mi SW of Princeton
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.238, -74.742

In addition to urban and poor drainage flooding, minor to moderate flooding occurred along the Assunpink Creek and Stony Brook. The Stony Brook at Princeton was above its 10 foot flood stage from 209 a.m. EDT through 741 a.m. EDT on the 17th. It crested at 10.54 feet at 445 a.m. EDT. The Assunpink Creek in Trenton was above its 8.5 foot flood stage from 1209 a.m. EDT through 842 a.m. EDT on the 17th. It crested at 9.65 feet at 5 a.m. EDT. Event precipitation totals included 3.03 inches in Lawrence, 2.85 inches in Pennington, 2.74 inches in Hightstown, 2.65 inches in Ewing, 2.51 inches in Robbinsville, 2.48 inches in Hamilton and Princeton and 2.38 inches in Trenton.

Flood, Hunterdon

When: April 16, 11:25 PM EST to April 17, 1:57 AM EST
Where: Hunterdon County, 0.46 mi ESE of Sunnyside to 0.73 mi SSE of Sunnyside
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.578, -74.872

The South Branch of the Raritan River at Stanton was above its 8 foot flood stage from 1225 a.m. EDT through 257 a.m. EDT on the 17th. It crested at 8.17 feet at 145 a.m. EDT. Event precipitation totals included 3.10 inches in Wertsville 3.10 and Ringoes, 2.79 inches in Readington, 2.57 inches in Flemington, 2.55 inches in Lebanon, 2.40 inches in Clinton, 2.33 inches in Stockton, 2.20 inches in High Bridge and 1.89 inches in Bethlehem.

Flood, Burlington

When: April 17, 12:00 AM EST to 7:00 PM EST
Where: Burlington County, 1.17 mi SSE of Hartford to 1.19 mi SSE of Hartford
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 39.965, -74.889

Flooding along Parkers Creek in Mount Laurel Township forced the closure of Union Mill Road. The heavy rain also caused basement flooding of homes on Oregon Trail in Medford Township. Event precipitation totals included 2.89 inches in Mount Laurel, 2.79 inches in Lumberton, 2.78 inches in Westampton, 2.61 inches in Medford, 2.50 inches in Wrightstown, 2.46 inches in Moorestown, 2.43 inches in Southampton, 2.33 inches in Medford Lakes and 2.32 inches in Burlington.

Flood, Gloucester

When: April 17, 2:41 AM EST to 9:52 AM EST
Where: Gloucester County, 2.4 mi WNW of Mullica Hill to 1.97 mi E of Swedesboro
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 39.744, -75.271

In addition to the tidal flooding along the Delaware River, the heavy rain caused the Raccoon Creek to flood inland. The Raccoon Creek near Swedesboro was above its 13 foot flood stage from 341 a.m. EDT through 1052 a.m. EDT on the 17th. It crested at 13.34 feet at 6 a.m. EDT. Event precipitation totals included 1.94 inches in Franklin.

Flood, Middlesex

When: April 17, 3:13 AM EST to 6:40 AM EST
Where: Middlesex County, 2.11 mi WNW of Middlesex to 2.16 mi W of Middlesex
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.585, -74.505

In addition to poor drainage flooding, both the Raritan River (moderate flooding) and Bound Brook (minor flooding) flooded. The Raritan River at Bound Brook in Somerset County crested at 31.1 feet. Flood stage is 28 feet. The Bound Brook at Middlesex was above its 9 foot flood stage from 413 a.m. EDT through 740 a.m. EDT on the 17th. It crested at 9.27 feet at 6 a.m. EDT. Event precipitation totals included 2.83 inches in Iselin, 2.62 inches in South Brunswick, 2.54 inches in Deans, 2.32 inches in Cranbury and 2.28 inches in New Brunswick.

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

Every storm in New Jersey in 2011 Every state in 2011 This day in weather history Warnings in New Jersey, April 2011

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: 303641, 303643, 303786, 302066, 302065, 301744, 302076.