Flooding in Pennsylvania, March 10 to 12, 2011

Name: Flooding in Pennsylvania, March 10 to 12, 2011
Start: 2011-03-10T16:59
End: 2011-03-12T18:25
Location: Pennsylvania

March 10 to 12, 2011 · NWS PHI · 11 events in 10 counties and zones

For the second time within a week heavy rain fell across Eastern Pennsylvania. 5 to 5 inches of precipitation fell and caused more widespread river, stream and poor drainage flooding including the Delaware, Lehigh and Schuylkill Rivers.

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: $2.0 million
Crop damage: None recorded
Events: 11

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.

For the second time within a week heavy rain fell across Eastern Pennsylvania. An additional 1.5 to 5 inches of precipitation fell and caused more widespread river, stream and poor drainage flooding including the Delaware, Lehigh and Schuylkill Rivers. On average moderate flooding occurred on the Lehigh River, with several locations recording top ten crests. Generally minor flooding occurred on the Delaware and Schuylkill Rivers. Snowmelt in the upper reaches of the Lehigh and Delaware Basins contributed ti the flooding. The worst reported damage was along the towpaths of the Lehigh River in Northampton County and the Delaware River in Bucks County. The heaviest precipitation amounts occurred in the Poconos, while the lightest precipitation amounts occurred in and around Philadelphia. Precipitation started during the late evening of the 9th, fell heavy at times during the daylight hours and evening on the 10th and ended between 3 a.m. EST and 6 a.m. EST on the 11th. | |The heavy rain was caused by a low pressure system that moved from the Southern Plains on the morning of the 8th northeast into Iowa on the morning of the 9th, Michigan on the morning of the 10th and into the eastern Great Lakes by the morning of the 11th. This system was able to tap moisture from both the Gulf of Mexico and Atlantic Ocean and lift it over its frontal boundaries. The deep southeast flow was able to enhance the precipitation further over the higher terrain of Eastern Pennsylvania. The rain ended once the low's occluded front moved through Pennsylvania on the 11th.

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 Mar 10, 4:50 PM EST, 9 minutes earlier.

Area forecast discussion, Mar 10, 4:50 PM EST, 9 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
450 PM EST THU MAR 10 2011

.SYNOPSIS...
LOW PRESSURE OVER WESTERN PENNSYLVANIA AND ANOTHER OVER VIRGINIA
WILL MOVE NORTHEASTWARD THROUGH TONIGHT AND BRING A COLD FRONT
ACROSS THE AREA TOWARD MORNING. WEAK HIGH PRESSURE WILL CROSS THE
AREA FRIDAY NIGHT INTO SATURDAY. AN ALBERTA CLIPPER LOW PRESSURE
SYSTEM IS THEN FORECAST TO PASS JUST NORTH OF OUR REGION AND BRING
ANOTHER COLD FRONT ACROSS ON SATURDAY. A HIGH PRESSURE SYSTEM
WILL THEN BUILD IN FOR EARLY NEXT WEEK.

&&

.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
MAY POST A WIND ADVISORY AT 5 PM. ISOLATED SUSTAINED 27 KT AND
TREES DOWN. CAUSE OF TREES DOWN UNKNOWN BUT SATURATED GROUND CAN
CONTRIBUTE TO LOWER WIND THRESHOLD TREE FALL.

LATEST RADAR IMAGERY IS COVERED WITH ECHOES, MAINLY OVER PA,
PORTIONS OF NJ AND MD, BUT THERE IS MORE RAIN DEVELOPING TO THE
SW OVER MD AND VA THAT WILL MOVE THROUGH LATER. ADDITIONALLY,
THERE MAY BE SOME THUNDERSTORM DEVELOPMENT OVER CENTRAL VA AND THE
REMNANTS OF THOSE STORMS WILL HAVE TO MOVE THROUGH AS WELL. SO,
OVERALL, THINGS STILL LOOK WET.

ALL OF THE MDL DATA REMAINS IN EXCELLENT AGREEMENT THAT THE WORST
IS YET TO COME, AND IT WILL LIKELY BE IN THE TIME PERIOD
11/00Z-11/06Z. SO, THE FLOOD WATCH WILL REMAIN IN EFFECT
UNCHANGED. IT IS ALSO STILL PSBL THAT THERE COULD BE AN ISOLD
TSTM, ESPECIALLY OVER SRN AND ERN SECTIONS, AND OF COURSE, ANY
CONVECTION WILL ONLY ENHANCE RAINFALL AMTS.

RAINFALL AMOUNTS OF 2 TO 3 INCHES WILL BE WIDESPREAD ESPECIALLY
FROM THE I-95 CORRIDOR N AND W. WITH ISO 4-4.5 NE PA AND N 1/4 NJ.
THESE AMOUNTS WILL PRODUCE MINOR TO MAJOR FLOODING ON THE
MAJORITY OF OUR WATERWAYS.

THE RAIN WILL BEGIN TO TAPER OFF LATER TONIGHT AND SHOULD END FROM
SOUTH TO NORTH BY DAYBREAK AFTER A COLD FRONT PASSES THROUGH THE
REGION. HOWEVER, THE FLOODING WILL CONTINUE THROUGH FRIDAY AND
INTO THE WEEKEND ON SOME OF OUR SLOWER REACTING RIVERS AND
STREAMS.

SE TO E WINDS WILL CONTINUE UNTIL FROPA AND WILL REMAIN QUITE
GUSTY, WITH SPEEDS PSBLY AS HIGH AS 35-40 MPH OVER SRN AND ERN
AREAS THROUGH THE EVENING HOURS.

&&

.SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/...
THE RAIN WILL CONTINUE TO WIND DOWN ERLY IN THE PD, WITH MOST OF
THE MDLS IN AGREEMENT THAT ITS OVER EVERYWHERE BY 11/18Z, IF NOT
SOONER. THE REST OF FRIDAY THEN LOOKS DRY WITH TEMPS IN THE 50S.
WEAK HIGH PRESSURE WILL BUILD IN FROM THE SOUTH ON SATURDAY, AS A
WEAK IMPULSE ROTATES THROUGH THE UPR LOW AND BRINGS A CLIPPER TYPE
SYSTEM THROUGH BUT AFFECTS AREAS MAINLY TO OUR N. HIGH PRESSURE
BUILDS MORE STRONGLY IN FOR SUNDAY. TEMPS WILL BE MAINLY IN THE
20S AND 30S SATURDAY NIGHT BUT WILL REBOUND QUITE NICELY INTO THE
50S ON SUNDAY.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
MUCH OF THE FIRST HALF OF THE EXTENDED PERIOD WILL HAVE FAIR WEATHER
ACROSS THE MIDDLE ATLANTIC REGION AS WE WILL BE BETWEEN SYSTEMS. ONE
LOW WILL BE MOVING OFF EASTERN CANADA WHILE A WAVE MOVES ACROSS THE
SOUTHEAST STATES MON AND INTO THE ATLANTIC TUE. A RIDGE BETWEEN THESE
SYSTEMS WILL KEEP BASICALLY DRY WEATHER FOR OUR AREA. TEMPERATURES
WILL BE NEAR NORMAL OR JUST SLIGHTLY BELOW WITH A NRLY FLOW FROM
CANADA PREVAILING EARLY NEXT WEEK. HIGHS MON AND TUE WILL BE IN THE
LOW 40S ACROSS THE NORTH AND MID TO UPPER 40S OVER THE DELMARVA AND
METRO PHILADELPHIA.

A PROGRESSIVE SHORT WAVE WHICH WILL MOVE ALONG THE U.S.-CANADA
BORDER NEXT WEEK WILL ARRIVE OVER OUR AREA WED AND PERSIST INTO THU.
IT WILL BRING THE POSSIBILITY FOR SOME SHOWERS AND MILDER TEMPS. THE
HPC GRAPHICS...WHICH FAVOR THE TIMING OF THE 00Z ECMWF...WAS USED
FOR THE SYSTEM. HIGHS ACROSS THE DELMARVA AND PHILADELPHIA WILL BE
IN THE LOW 50S WED AND UPPER 50S THU...READINGS WILL BE 5 OR SO
DEGREES LESS ACROSS THE NRN AREAS.

&&

.AVIATION /22Z THURSDAY THROUGH TUESDAY/...
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY AND SURROUNDING AREAS.

REST OF TODAY...CONDS MVFR VARIABLE IFR IN SHOWERS VARYING INTENSITY
FROM LIGHT TO HEAVY. GUSTY ESE WINDS RANGING FROM NEAR 20 KNOTS VCNTY
KRDG KABE TO BETWEEN 33 AND 38 KNOTS ELSEWHERE. INCREASING LLWS
THROUGH THE AFTERNOON BETWEEN 500 AND 2000 FT.

TONIGHT...IFR VARIABLE LIFR BAND OF INTENSE SHOWERS WITH EMBEDDED
THUNDER IS EXPECTED ALONG WITH LLWS OF 55 TO 65 KTS AS 5MB 3 PM SFC
PRES FALLS AHEAD OF LOW PRES MOVING NNE INTO CENTRAL PA SWEEPS ITS
COOL FRONT EAST AND CONCENTRATES RAIN IN A 3-6 HR WIDE BAND AHD OF
THE FRONT. WE MAY NEED TO ADD CB TO THE FCST FOR FOR SOME OF THE
TAF SITES...ESPECIALLY KPHL S AND E IN THE 23Z-04Z TIME FRAME.
SURFACE GUSTS IN THE PHL/ILG SEWD SHOULD BRIEFLY REACH 40 KNOTS.

AFTER 05Z...HEAVY SHOWERS AND LLWS TRANSLATE SLOWLY NEWD OF OUR
TAF SITES AND ABATE BY 09Z LEAVING IFR OR LIFR IN FOG/STRATUS AND
VIRTUALLY NO WIND BY 10Z FRIDAY.

OUTLOOK...
FRIDAY...IFR CONDITIONS IMPROVE TO VFR CIGS BETWEEN 14Z AND 16Z.
SW WIND GUSTS 15 TO 20 KNOTS MIDDAY.

FRIDAY NIGHT AND SATURDAY...VFR CONDITIONS SHOULD CONTINUE (WITH
A BRIEF PERIOD OF MVFR CEILINGS POSSIBLE AT KRDG AND KABE) AHEAD
WHAT SHOULD BE A DRY COLD FRONTAL PASSAGE LATE SATURDAY NIGHT OR
SUNDAY MORNING. SW GUSTS DURING THE MIDDAY HOURS SATURDAY TO 25
KNOTS.

SUNDAY...BEHIND THE FRONT...VFR CONDITIONS SHOULD CONTINUE...WITH
WIND GUSTS TO 25 KNOTS FROM THE WEST AND NORTHWEST..

&&

.MARINE...
GALE CONTINUED.

SO FAR THIS MORNING SINCE 7 AM EDT CHES LIGHT AND SHIP JOHN SHOAL
HAD ISOLATED GUSTS 34-35KTS AND CAPE MAY 37 KT WHICH SEEMS TO BE
LINKED WELL TO THE BL WIND FCST OF THE RECENT NAM CYCLES. DURING
MID AFTERNOON MANY REPORTS OF 30-35 KT ON THE WARMER LAND.

BEST CHANCE OF FREQUENT GALE FORCE GUSTS WOULD BE THE LATE AFTERNOON
THROUGH 0600 UTC FRIDAY (DURING THE TIME OF BEST MIXING UNDER THE
LOW INVERSION AND GRADIENT) ALONG THE WARMEST NEARSHORE WATERS.

CONVECTIVE BURST IN DELAWARE AROUND 7 PM MAY CONTRIBUTE TO HIGHER
GUSTS THIS EVENING. WATCH THE ADVANCE OF THE LIGHTNING OUT OF
VIRGINIA LATE TODAY.

AFTER 0600 UTC...THE GRADIENT STARTS TO BACK OFF A BIT AHEAD OF
THE COLD/OCCLUDED FRONT).

WITH THE PASSAGE OF THE FRONT...WIND WILL BECOME SOUTHWEST AND DROP
OFF CONSIDERABLY FOR A TIME FRIDAY MORNING (PERHAPS EVEN BELOW SMALL
CRAFT LEVELS). THIS MAY TEND TO INCREASE AGAIN AS THE GRADIENT TRIES
TO TIGHTEN IN THE AFTERNOON. EVEN IF WINDS DO NOT GET BACK TO SMALL
CRAFT LEVELS FRIDAY...SEAS WILL REMAIN WELL ABOVE 5 FEET ON THE
OCEAN WATERS THROUGHOUT THE DAY...AS THE SWELL SLOWLY SORTS ITSELF
OUT.

THE GRADIENT SHOULD INCREASE FRIDAY NIGHT INTO SATURDAY AHEAD OF THE
NEXT COLD FRONT. GUSTS SHOULD GET INTO THE SMALL CRAFT RANGE DURING
FRIDAY NIGHT AND LAST INTO SATURDAY NIGHT. SEAS MAY HAVE A HARD TIME
GETTING BELOW 5 FEET ON THE OCEAN BEFORE INCREASING AGAIN IN THE
SOUTHWEST FETCH AHEAD OF THE FRONT.

THE PASSAGE OF THE DRY COLD FRONT SHOULD OCCUR EARLY SUNDAY MORNING.
BEHIND THE FRONT...THE GRADIENT AND MIXING IN THE COLD AIR ADVECTION
SHOULD SUPPORT SMALL CRAFT WIND GUSTS...ESPECIALLY ON THE OCEAN
WATERS...FOR MUCH OF SUNDAY. AFTER THE PASSAGE OF THE FRONT...STRONG
HIGH PRESSURE WILL BUILD ACROSS EASTERN CANADA AND RIDGE DOWN THE
COAST...BRINGING SUB ADVISORY CONDITIONS FOR EARLY NEXT WEEK.

&&

.HYDROLOGY...
FLW OUT FOR MOST VULNERABLE AREA THROUGH 430 AM. A NUMBER OF SMALL
STREAMS RAPIDLY APPROACHING BANKFULL FROM FAR N DEL INTO SE PA.
WE'LL EXPAND WARNINGS AND GO WITH MORE SERIOUS MAIN-STEM WARNINGS
AS IT BECOMES OBVIOUS.

RER RAIN NOW AT KABE AND POSSIBLY HEADING FOR ALL TIME MARCH DAILY
RECORD AT KABE...NEEDING JUST 1.7 INCHES BETWEEN NOW AND MIDNIGHT
FOR THE 3 INCH MARK THERE.

AS OF 430 PM...

WALNUTPORT PA UP TO 2.20 INCHES LANDINGVILLE PA 2.01 INCHES. STORM
TOTALS COULD REACH 4 OR 4.5 INCHES THERE AND IN NNJ.

WE ARE MAINLY GOING WITH 2.00 TO 3.00 INCHES ELSEWHERE ACROSS THE
REGION EXCEPT WE EXPECT NEAR 4 INCHES IN PARTS OF NE PA N OF KABE
AND IN N 1/4 NJ ALONG AND N OF INTERSTATE 78. WE'RE LOOKING AT A
SIGNIFICANT FLOOD EVENT...PROBABLY MORE EXTENSIVE THAN THE
FLOODING OF LAST MARCH 2010.

IN PENNSYLVANIA....

LEHIGH BASIN - CAUTION STAGE TO MINOR FLOODING
SCHUYLKILL RIVER BASIN - MINOR FLOODING
SOUTHEAST PA BASINS - MINOR TO MODERATE FLOODING
DELAWARE RIVER BASIN - MINOR TO MODERATE FLOODING
CARBON/MONROE COUNTY BASINS - MINOR TO MODERATE FLOODING

IN NEW JERSEY...

PASSAIC BASIN - MODERATE TO MAJOR FLOODING WITH SOME RECORDS POSSIBLE
RARITAN BASIN - MINOR TO MODERATE FLOODING WITH SOME MAJOR FLOODING
ASSUNPINK BASIN - MINOR TO MODERATE FLOODING
RANCOCAS BASIN - MINOR FLOODING

CREEKS AND RIVERS ARE FORECAST TO CLIMB ABOVE FLOOD STAGE TONIGHT AND
SATURDAY. CRESTS WILL OCCUR ALONG THE LARGE RIVERS SATURDAY INTO
SUNDAY. IN SOME CASES ACROSS THE PASSAIC, FORECAST POINTS WILL
REMAIN IN FLOOD THROUGH THE NEXT RISE AND NOT FALL BELOW FLOOD
STAGE UNTIL NEXT WEEK.

IF YOU LIVE OR WORK IN A FLOODPLAIN WHERE FLOODING COULD OCCUR,
PLEASE USE THE EARLY PART OF TODAY TO FINISH ANY LAST MINUTE
PREPARATIONS.

VISIT OUR ADVANCED HYDROLOGIC PREDICTION SERVICE (AHPS) WEBSITE FOR
THE LATEST RIVER FORECASTS (IN LOWERCASE)...

HTTP:/WATER.WEATHER.GOV/AHPS2/INDEX.PHP?WFO=PHI

FOR INUNDATION MAPPING ALONG PORTIONS OF THE DELAWARE RIVER...

HTTP:/WATER.WEATHER.GOV/AHPS/INUNDATION.PHP

&&

.TIDES/COASTAL FLOODING...
COASTAL FLOOD WARNING POSTED AT 3PM. ODDS FOR REACHING MODERATE
THRESHOLD ARE IN MY OPINION ABOUT 85 PERCENT AT PHL AND 65 PERCENT
AT REEDY POINT. ITS NOT A LOCK SHUT CASE FOR MODERATE BUT TRENDS
ARE FAVORABLE AS SOUTHEAST WINDS CONTINUE PILING WATER UP AT THE
UPPER END OF THE DEL BAY THIS EVENING.

PHILADELPHIA HAD A HIGHER DEPARTURE EARLY THIS MORNING COMPARED TO
REEDY POINT WITH THE STORM TIDE EXCEEDING THE THE MINOR FLOOD
THRESHOLD BY LESS THAN AN INCH 8.22 VS THE FS OF 8.20. REEDY POINT
WAS HALF A FOOT UNDER FS. THIS IS POSSIBLY DUE TO THE NARROWER
CHANNELING AND EASIER FILLING OF THE BASIN NEAR PHL AND ALSO THE
HIGHER THAN NORMAL FLOW OF THE DELAWARE RIVER.

THAT SAID...THIS PLACES PHL IN A PRETTY GOOD POSITION TO REACH
MODERATE COASTAL FLOOD THRESHOLD TOMORROW MORNING.

REEDY POINT THIS AFTERNOON WAS ABOUT .3 UNDER FS AT 230 PM
AND PHL IS PROJECTING ABOUT 0 TO .1 UNDER FS AROUND 524 PM.

THE OVERALL SCENARIO FOR COASTAL FLOODING HAS NOT CHANGED FOR THE
HIGH TIDE CYCLE LATE TONIGHT AND EARLY FRIDAY MORNING. THE GREATEST
THREAT REMAINS ON THE UPPER DELAWARE BAY AND THE DELAWARE
RIVER...WHERE FUNNELING OF GALE FORCE WIND GUSTS COULD PRODUCE
MODERATE TIDAL FLOODING DURING THE EARLY MORNING HIGH TIDE CYCLE.

LOCAL GUIDANCE AND THE MDL STORM SURGE GUIDANCE BOTH SUGGEST TIDE
HEIGHTS APPROACHING MODERATE TIDAL FLOODING AS HIGH TIDE APPROACHES.
HIGH TIDE OCCURS AT REEDY POINT AROUND 230 AM FRIDAY...AND THE HIGH
TIDE OCCURS AT PHILADELPHIA CLOSER TO 530 AM FRIDAY.

CHESAPEAKE BAY...GREATEST IMPACT OF THE PERSISTENT GUSTY ESE FLOW
IS ON THE WEST SIDE OF THE BAY AND TO OUR KNOWLEDGE NO FLOODING
OCCURRED THIS MORNING ON THE MD E SHORE. FORECASTS ARE RUNNING TO
HIGH SO FAR ON CBOFS AND SO FOR NOW...I THINK ODDS STRONGLY FAVOR
ONLY ADVY CRITERIA THIS EVENING AS IS ALREADY POSTED IN OUR PRODUCT.

THE HIGH TIDE CYCLE LATE THIS EVENING COULD PRODUCE A BETTER CHANCE
AT MINOR TIDAL FLOODING. BASED ON THE CHESAPEAKE BAY FORECASTING
SYSTEM OUTPUT...BOTH CAMBRIDGE AND TOLCHESTER WOULD EXCEED MINOR
TIDAL FLOODING BENCHMARK NUMBERS DURING THIS TIDE CYCLE. HIGH TIDE
THIS EVENING OCCURS BETWEEN 730 PM AND 1100 PM...FROM SOUTH TO
NORTH.

&&

.CLIMATE...
ANOTHER ROBUST SURGE OF MOISTURE FROM THE SOUTHWEST WILL INUNDATE
OUR REGION ONCE AGAIN AND MAY PROVIDE SOME AREAS WITH RECORD OR
NEAR RECORD RAINFALL. IT APPEARS THAT WE WILL HAVE A GREAT CHANCE AT
BREAKING SOME ONE-DAY RAINFALL RECORDS ACROSS SOME OF OUR 8 CLIMATE
SITES. THESE RECORDS ARE FOR MARCH 10 & 11.

MARCH 10 RAINFALL RECORDS:            ALL-TIME 1-DAY MARCH RECORDS:

PHL ->  1.43 (1994)                   PHL -> 2.79 (3/15/1912)
ABE ->  1.25 (1994)                   ABE -> 2.99 (3/11/1952)
ILG ->  1.50 (1902)                   ILG -> 3.21 (3/21/2000)
RDG ->  1.70 (1994)                   RDG -> 3.03 (3/20/1958)
TTN ->  1.40 (1994)                   TTN -> 3.62 (3/25/1876)
ACY ->  1.25 (1994)                   ACY -> 2.69 (3/10/2010)

MARCH 11 RAINFALL RECORDS:

PHL -> 1.69 (1952)
ABE -> 2.99 (1952)
ILG -> 1.43 (1952)
RDG -> 1.30 (1952)
TTN -> 2.19 (1901)
ACY -> 1.10 (1924)

IT APPEARS OUR REAL TIME DATA IS A CLOSE TO FIT TO THE RADAR OHP
AND STP INFORMATION.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...FLOOD WATCH THROUGH FRIDAY MORNING FOR PAZ054-055-060>062-
     067>071.
     COASTAL FLOOD WARNING FROM 1 AM TO 8 AM EST FRIDAY FOR PAZ070-
     071.
NJ...FLOOD WATCH THROUGH FRIDAY MORNING FOR NJZ001-007>010-012>027.
     COASTAL FLOOD WARNING FROM 1 AM TO 8 AM EST FRIDAY FOR
     NJZ016>019.
DE...FLOOD WATCH THROUGH FRIDAY MORNING FOR DEZ001>004.
     COASTAL FLOOD WARNING FROM 1 AM TO 8 AM EST FRIDAY FOR DEZ001.
MD...FLOOD WATCH THROUGH FRIDAY MORNING FOR MDZ008-012-015-019-020.
     COASTAL FLOOD ADVISORY UNTIL MIDNIGHT EST TONIGHT FOR MDZ012-
     015-019-020.
MARINE...GALE WARNING UNTIL 3 AM EST FRIDAY FOR ANZ430-431-450>455.

&&

SYNOPSIS...NIERENBERG
NEAR TERM...NIERENBERG
SHORT TERM...NIERENBERG
LONG TERM...O'HARA
AVIATION...DRAG
MARINE...DRAG
HYDROLOGY...STAFF/DRAG 449P
TIDES/COASTAL FLOODING...
CLIMATE...449P

Hazardous weather outlook, Mar 10, 3:50 PM EST, 1 hour 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
350 PM EST THU MAR 10 2011

NJZ001-PAZ054-055-112100-
SUSSEX-CARBON-MONROE-
350 PM EST THU MAR 10 2011

...FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING...

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

.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.

   FLOOD WATCH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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

   FLOOD WATCH.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NJZ007>010-012-015-PAZ060>062-067>069-112100-
WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-BERKS-LEHIGH-
NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS-
350 PM EST THU MAR 10 2011

...FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING...

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

.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.

   FLOOD WATCH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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

   FLOOD WATCH.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DEZ001-NJZ016>019-PAZ070-071-112100-
NEW CASTLE-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-DELAWARE-
PHILADELPHIA-
350 PM EST THU MAR 10 2011

...FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING...
...COASTAL FLOOD WARNING IN EFFECT FROM 1 AM TO 8 AM EST FRIDAY...

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

.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.

   FLOOD WATCH.
   COASTAL FLOOD WARNING.

ADDITIONALLY, WINDS COULD GUST IN THE 35 TO 40 MPH RANGE THIS
EVENING WHICH COUPLED WITH THE WET GROUND COULD BRING DOWN TREES.
THERE COULD ALSO BE A RUMBLE OF THUNDER THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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

   FLOOD WATCH.
   COASTAL FLOOD WARNING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

MDZ008-112100-
CECIL-
350 PM EST THU MAR 10 2011

...FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MARYLAND.

.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.

   FLOOD WATCH.

ADDITIONALLY, WINDS COULD GUST IN THE 35 TO 40 MPH RANGE THIS
EVENING WHICH COUPLED WITH THE WET GROUND COULD BRING DOWN TREES.
THERE COULD ALSO BE A RUMBLE OF THUNDER THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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

   FLOOD WATCH.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

ANZ430-431-450>455-112100-
DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE-
DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE-
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-
350 PM EST THU MAR 10 2011

...GALE WARNING IN EFFECT UNTIL 3 AM EST FRIDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND
DELAWARE BAY 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...FRIDAY THROUGH WEDNESDAY.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

MDZ012-015-019-020-112100-
KENT MD-QUEEN ANNES-TALBOT-CAROLINE-
350 PM EST THU MAR 10 2011

...FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING...
...COASTAL FLOOD ADVISORY IN EFFECT UNTIL MIDNIGHT EST TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MARYLAND.

.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.

   FLOOD WATCH.
   COASTAL FLOOD ADVISORY.

THERE COULD ALSO BE A RUMBLE OF THUNDER THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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

   FLOOD WATCH.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DEZ002>004-NJZ013-014-020>027-112100-
KENT-INLAND SUSSEX-DELAWARE BEACHES-WESTERN MONMOUTH-
EASTERN MONMOUTH-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-
350 PM EST THU MAR 10 2011

...FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING...

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

.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.

   FLOOD WATCH.

ADDITIONALLY, WINDS COULD GUST IN THE 35 TO 40 MPH RANGE THIS
EVENING WHICH COUPLED WITH THE WET GROUND COULD BRING DOWN TREES.
THERE COULD ALSO BE A RUMBLE OF THUNDER THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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

   FLOOD WATCH.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

The radar

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

Open the radar archive at this moment

Event by event

11 flood. Local standard time, as filed.

Flood, Chester

When: March 10, 4:59 PM EST to March 12, 2:35 AM EST
Where: Chester County, 1.63 mi NW of Cedarville to 1 mi NE of Honey Brook
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.249, -75.688

Flooding along the Brandywine Creek and its branches affected Creek Road in Birmingham, Pennsylvania State Route 926 in Pocopson and Birmingham, U.S. Route 1 in Chadds Ford and Pennsybury Township and Chestnut Street in Downingtown. Unionville Schools were closed because of flooded roadways along the creek. In East Conventry Township, the Schuylkill River flooded Towpath Park. Flooding also occurred along Pigeon Creek within the township. Pennsylvania State Route 724 near Pottstown (Montgomery County) was also flooded by the Schuylkill. In West Chester, poor drainage flooding closed Montgomery Avenue.

The Schuylkill River at Pottstown (Montgomery County) was above its 13 foot flood stage from 740 a.m. EST on the 11th through 235 a.m. EST on the 12th. It crested at 14.13 feet at 730 p.m. EST on the 11th. The West Branch of the Brandywine Creek at Honeybrook had moderate flooding and was above its 7 foot flood stage from 459 p.m. EST on the 10th through 234 a.m. EST on the 11th. It crested at 9.34 feet at 1030 p.m. EST on the 10th. Farther downstream, the West Branch of the Brandywine Creek at Coatesville was above its 7 foot flood stage from 830 p.m. EST on the 10th through 351 a.m. EST on the 11th. It crested at 7.25 feet at 200 a.m. EST on the 11th. The East Branch of the Brandywine Creek below Downingtown had moderate flooding. The creek was above its 7 foot flood stage from 511 p.m. EST on the 10th through 716 a.m. EST on the 11th. It crested at 10.67 feet at 1215 a.m. EST on the 11th. The main stem of the Brandywine Creek at Chadds Ford had moderate flooding. The creek was above its 9 foot flood stage from 920 p.m. EST on the 10th through 511 p.m. EST on the 11th. It crested at 11.88 feet at 645 a.m. EST on the 11th. The French Creek at Phoenixville was above its 8 foot flood stage from 857 p.m. EST on the 10th through 951 a.m. EST on the 11th. It crested at 8.96 feet at 315 a.m. EST on the 11th. The Valley Creek at Valley Forge was above its 7 foot flood stage from 951 p.m. EST on the 10th through 1243 a.m. EST on the 11th. It crested at 7.44 feet at 1115 p.m. EST on the 10th.

Event precipitation totals included 3.30 inches in Northbrook, 3.07 inches in Downingtown, 2.94 inches in West Chester, 2.84 inches in Exton, 2.81 inches in Unionville, 2.60 inches in Honey Brook and 2.52 inches in Valley Forge.

Flood, Berks

When: March 10, 7:03 PM EST to March 11, 8:04 PM EST
Where: Berks County, 0.34 mi SSW of West Hamburg to 0.58 mi NNE of Bally
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.545, -76.002

In addition to the Schuylkill and Manatawny flooding, flooding along the Monocacy Creek closed Monocacy Creek Road in Amity Township. The Schuylkill River at Berne had moderate flooding and was above its 12 foot flood stage from 1019 p.m. EST on the 10th through 526 p.m. EST on the 11th. It crested at 14.20 feet at 6 a.m. EST on the 11th. Farther downstream, the Schuylkill River at Reading was above its 13 foot flood stage from 412 a.m. EST through 804 p.m. EST on the 11th. It crested at 15.01 feet at 1230 p.m. EST on the 11th. While classified as minor, the flooding was still the 10th highest on record and the highest since June of 2006. The Manatawny Creek at Spangville was above its 6 foot flood stage from 703 p.m. EST on the 10th through 802 a.m. EST on the 11th. It crested at 6.93 feet at 145 a.m. EST on the 11th.

Event precipitation totals 3.03 inches in Bethel, 2.70 inches in Bernville, 2.69 inches in Bechtelsville, 2.63 inches in Reading, 2.42 inches in Wyomissing and 2.36 inches in Fleetwood.

Flood, Delaware

When: March 10, 9:20 PM EST to March 11, 5:11 PM EST
Where: Delaware County, 1.57 mi W of Chadds Ford to 1.61 mi SW of Newton Square
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 39.874, -75.599

Flooding along the Brandywine Creek closed the Chadds Ford Township schools because of flooded roadways along the creek. The Brandywine Creek at Chadds Ford had moderate flooding. The creek was above its 9 foot flood stage from 920 p.m. EST on the 10th through 511 p.m. EST on the 11th. It crested at 11.88 feet at 645 a.m. EST on the 11th. The Chester Creek in Chester briefly was above its 8 foot flood stage from 11 p.m. EST on the 10th through 1203 a.m. EST on the 11th. It crested at 8.05 feet at 1130 p.m. EST on the 10th. Crum Creek at Newtown Square was above its 6 foot flood stage from 939 p.m. EST on the 10th through 205 a.m. EST on the 11th. It crested at 6.43 feet at 10 p.m EST on the 10th.

Event precipitation totals included 1.89 inches in Media and 1.88 inches in Drexel Hill.

Flood, Lehigh

When: March 10, 9:55 PM EST to March 11, 8:27 PM EST
Where: Lehigh County, 1.03 mi N of Slatington to 0.36 mi N of Bethlehem
Cause: Heavy Rain / Snow Melt
Reported by: River/Stream Gage
Coordinates: 40.765, -75.597

In Allentown, flooding along the Little Lehigh and Trout Creeks closed parts of Third, Fourth and Union Streets on the morning of the 11th. One motorist became stuck in flood waters on Fourth Street and had to be rescued. Residents living on the island within the Lehigh River were evacuated.

The Lehigh River at Walnutport (Northampton County) had moderate flooding and was above its 8 foot flood stage from 955 p.m. EST on the 10th through 827 p.m. EST on the 11th. It crested at 12.72 feet at 545 a.m. EST on the 11th. It was the third highest crest on record at Walnutport and the highest crest since August of 1955. Farther downstream, the Lehigh River at Bethlehem was above its 16 foot flood stage from 713 a.m. EST through 229 p.m. EST on the 11th. It crested at 17.17 feet at 11 a.m. EST on the 11th.

Event precipitation totals included 2.76 inches in Schnecksville, 2.63 inches in Slatington and 2.58 inches at the Lehigh Valley International Airport.

Flood, Northampton

When: March 10, 9:55 PM EST to March 12, 5:38 PM EST
Where: Northampton County, Walnutport to 1.07 mi E of Columbia
Cause: Heavy Rain / Snow Melt
Property damage: $1.8 million
Reported by: River/Stream Gage
Coordinates: 40.750, -75.580

Northampton County was affected by the one two combination of flooding along the Lehigh and Delaware Rivers. Flooding along these rivers also caused smaller streams and rivers to back up and flood. The flooding also caused considerable damage along the towpaths of both the Lehigh and Delaware River Canals. In Bethlehem, flooding along the Lehigh River forced the evacuation of about 100 residents along Wilson Avenue. While homes were not affected, sections of Wilson Avenue as well as Sculac and Farmersville Roads were impassable. Evacuations also occurred along the Monocacy Creek in Bethlehem's Colonial Industrial Quarter. In Easton, dozens of people were evacuated along Bushkill Drive after the Bushkill Creek flooded. Homes suffered basement flooding. Larry Holmes and Lehigh Drives were closed along the Lehigh River. Pennsylvania State Route 611 South was closed along the Delaware River. Most of the roads were reopened on the 12th.

Flooding along the Lehigh and Delaware Rivers caused considerable damage along the Lehigh Canal Towpath and the Delaware Canal Towpath into Bucks County. Along the Lehigh River, the damage was caused more by the strength of the current than the crest itself. Along the Lehigh River, in Walnutport a one hundred fifty foot section of a wall collapsed and a half mile section of the towpath was damaged. In Freemansburg, damage was described as worse than what occurred during the 2004 flooding with Ivan. Trail surfaces were washed away and foundations exposed. The river scoured the towpath down to the original clay base from 1828. In Bethlehem, about seventy-five percent of a three mile stretch of the towpath was damaged. There were washouts on two bridges. The Delaware Canal State Park suffered surface damage and washouts and was closed from Easton to Wy Hit Tuk Park in Williams Township. From Wy Hit Tuk Park south to Upper Black Eddy in Bucks County, the trail was passable by foot, but not by bike.

The Delaware River at Easton had moderate flooding. The river was above its 22 foot flood stage from 914 a.m. EST on the 11th through 538 p.m. EST on the 12th. It crested at 26.11 feet at 1245 a.m. EST on the 12th. The Lehigh River at Walnutport (Northampton County) had moderate flooding and was above its 8 foot flood stage from 955 p.m. EST on the 10th through 827 p.m. EST on the 11th. It crested at 12.72 feet at 545 a.m. EST on the 11th. It was the third highest crest on record at Walnutport and the highest crest since August of 1955. Farther downstream, the Lehigh River at Bethlehem had minor flooding and was above its 16 foot flood stage from 713 a.m. EST through 229 p.m. EST on the 11th. It crested at 17.17 feet at 11 a.m. EST on the 11th. Farthest downstream, the Lehigh River at Glendon had major flooding and its highest crest since June of 2006. The river was above its 19 foot flood stage from 426 a.m. EST on the 11th through 1245 a.m. EST on the 12th. It crested at 22.49 feet at 1130 a.m. EST on the 11th.

Event precipitation totals included 4.02 inches in Walnutport, 2.61 inches in Nazareth, 2.60 inches in Plainfield, 2.55 inches in Glendon and 2.21 inches in Martins Creek.

Flood, Montgomery

When: March 10, 10:37 PM EST to March 12, 2:35 AM EST
Where: Montgomery County, East Greenville to 0.97 mi WSW of Willow Grove
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.420, -75.500

The Schuylkill River flooded Riverfront Park in Pottstown. It also forced the closure of Keim Street. Also in Pottstown, the High Street Bridge over the Manatawny Creek was closed. In New Hanover Township, the Middle Creek flooded Ludwig and Sassamanville Roads.

The Schuylkill River at Pottstown was above its 13 foot flood stage from 740 a.m. EST on the 11th through 235 a.m. EST on the 12th. It crested at 14.13 feet at 730 p.m. EST on the 11th. The East Branch of the Perkiomen Creek at Schwenksville was above its 7 foot flood stage from 202 a.m. EST through 707 a.m. EST on the 11th. It crested at 7.58 feet at 445 a.m. EST. The main stem of the Perkiomen Creek at East Greenville was above its 4 foot flood stage from 1037 p.m. EST on the 10th through 557 a.m. EST on the 11th. It crested at 4.42 feet at 300 a.m. EST on the 11th. The Wissahickon Creek at Fort Washington was above its 11 foot flood stage from 1245 a.m. EST through 307 a.m. EST on the 11th. It crested at 9.30 feet at 200 a.m. EST.

Event precipitation totals included 2.59 inches in Pottstown, 2.14 inches in Ardmore, 2.10 inches in Wynnewood, 2.04 inches in Gilbertsville, 2.00 inches in Spring Mount, 1.98 inches in Hatfield, 1.96 inches in Schwenksville, 1.87 inches in Ambler and 1.78 inches in Collegeville.

Flood, Carbon

When: March 10, 10:50 PM EST to March 11, 11:00 PM EST
Where: Carbon County, Lehighton to 2.12 mi SW of East Side
Cause: Heavy Rain / Snow Melt
Reported by: River/Stream Gage
Coordinates: 40.830, -75.720

The flooding Lehigh River destroyed fencing in Weissport. Sections of the Lehigh Canal Towpath were washed away and closed. In Lehighton, flooding along the Mahoning Creek covered walking paths in the Bear Creek Memorial Park. The Lehigh River at Lehighton had moderate flooding and was above its 10 foot flood stage from 1050 p.m. EST on the 10th through 1042 a.m. EST on the 11th. It crested at 12.95 feet at 345 a.m. EST on the 11th. This was the 8th highest crest on record. The Pohopoco Creek at Kresgeville (Monroe County) was above its 8.5 foot flood stage from 341 a.m. EST through 813 a.m. EST on the 11th. It crested at 8.77 feet at 615 a.m. EST. The Tobyhanna Creek at Blakeslee (Monroe County) had major flooding and was above its 10 foot flood stage from 1221 a.m. EST through 1100 p.m. EST on the 11th. It crested at 12.04 feet at 1000 a.m. EST on the 11th. The Aquashicola Creek at Palmerton was above its 7 foot flood stage from 458 a.m. EST through 101 p.m. EST on the 11th. It crested at 7.59 feet at 830 a.m. EST.

Event precipitation totals included 4.25 inches in Jim Thorpe, 4.22 inches in Bowmanstown, 4.13 inches in Coalsdale, 3.89 inches in Weatherly and 3.86 inches in Lehighton.

Flood, Monroe

When: March 10, 11:21 PM EST to March 12, 9:56 AM EST
Where: Monroe County, 3.31 mi ENE of Shoemakers to 3.7 mi ENE of Skytop
Cause: Heavy Rain / Snow Melt
Reported by: River/Stream Gage
Coordinates: 41.103, -74.974

The Delaware River at Tocks Island was above its 21 foot flood stage from 416 p.m. EST on the 11th through 956 a.m. EST on the 12th. It crested at 22.88 feet at 1245 a.m. EST on the 11th. The Lehigh River at Stoddartsville was above its 7 foot flood stage from 502 a.m. EST through 154 p.m. EST on the 11th. It crested at 7.65 feet at 815 a.m. EST on the 11th. The Brodhead Creek at Analomink was above its 8 foot flood stage from 1121 p.m. EST on the 10th through 639 a.m. EST on the 11th. It crested at 8.86 feet at 3 a.m. EST on the 11th. Farther downstream, the Brodhead Creek at Minisink Hills flooded twice, the first time from the upstream runoff and the second time from being backed up by the Delaware River. The creek was above its 10 foot flood stage from 159 a.m. EST through 822 a.m. EST on the 11th and again from 647 p.m. EST on the 11th through 533 a.m. EST on the 12th. The first and higher crest of 10.71 feet occurred at 515 a.m. EST on the 11th. The second and lower crest occurred at 1115 p.m. EST on the 11th. The Pohopoco Creek at Kresgeville was above its 8.5 foot flood stage from 341 a.m. EST through 813 a.m. EST on the 11th. It crested at 8.77 feet at 615 a.m. EST. The Bush Kill at Shoemakers was above its 6 foot flood stage from 230 a.m. EST through 1022 p.m. EST on the 11th. It crested at 6.90 feet at 930 a.m. EST. The Tobyhanna Creek at Blakeslee had major flooding and was above its 10 foot flood stage from 1221 a.m. EST through 1100 p.m. EST on the 11th. It crested at 12.04 feet at 1000 a.m. EST on the 11th.

Precipitation event totals included 5.08 inches in Mount Pocono, 4.45 inches in Coolbaugh, 4.14 inches in Blakeslee and 3.05 inches in East Stroudsburg.

Flood, Bucks

When: March 11, 4:43 AM EST to 10:00 AM EST
Where: Bucks County, 0.18 mi SW of Langhorne to 0.09 mi W of Langhorne
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.168, -74.953

The Neshaminy Creek at Langhorne was above its 9 foot flood stage from 443 a.m. EST through 10 a.m. EST on the 11th. It crested at 9.51 feet at 730 a.m. EST.

Precipitation event totals included 2.18 inches in Furlong, 2.08 inches in Doylestown and 1.42 inches in Penndel.

Flood, Philadelphia

When: March 11, 7:45 AM EST to 10:30 AM EST
Where: Philadelphia County, 1.9 mi W of Roxborough to 1.61 mi NW of West Philadelphia
Cause: Heavy Rain
Reported by: River/Stream Gage
Coordinates: 40.047, -75.266

The Schuylkill River in Philadelphia was above its 11 foot flood stage from 745 a.m. EST through 1030 a.m. EST on the 11th. It crested at 11.03 feet at 830 a.m. EST on the 11th. The combination of the up the Delaware Bay and River wind flow and freshwater runoff produced minor tidal flooding along the Delaware River and tidal sections of its tributaries during the late afternoon high tide cycle on the 10th and the early morning high tide cycle on the 11th. The highest tide occurred on the 11th and reached 9.01 feet above mean lower low water in Philadelphia. Minor tidal flooding starts at 8.20 feet above mean lower low water. Moderate tidal flooding starts at 9.20 feet above mean lower low water.

Event precipitation amounts included 1.92 inches in Wyndmoor, 1.46 inches at the Philadelphia International Airport and 1.27 inches in Rockledge.

Flood, Bucks

When: March 11, 10:41 AM EST to March 12, 6:25 PM EST
Where: Bucks County, Riegelsville to 1.47 mi NE of Upper Black Eddy
Cause: Heavy Rain / Snow Melt
Property damage: $250,000
Reported by: River/Stream Gage
Coordinates: 40.600, -75.200

Delaware River flooding caused basement flooding along Waterloo Street in New Hope. In Yardley, North Delaware Avenue was flooded and closed. Residents moved their vehicles to the west side of the Delaware Canal. Damage occurred along the Delaware River Canal Towpath. Between Upper Black Eddy and Wy Hit Tuk Park in Northampton County, the towpath was only accessible by foot and not bike. A lock wall from 1832 collapsed in Lumberville. The towpath collapsed on Mechanics Street in New Hope.

The Delaware River had minor flooding along its length in Bucks County south through Yardley. From north to south: The Delaware River at Riegelsville was above its 22 foot flood stage from 1041 a.m. EST on the 11th through 625 p.m. EST on the 12th. It crested at 25.20 feet at 145 a.m. EST on the 12th. Farther south, the Delaware River at Frenchtown (Hunterdon County) was above its 16 foot flood stage from 330 p.m. EST on the 11th through 348 p.m. EST on the 12th. It crested at 17.21 feet at 300 a.m. EST on the 11th. The Delaware River at Stockton (Hunterdon County) was above its 18 foot flood stage from 622 p.m. EST on the 11th through 415 p.m. EST on the 12th. It crested at 19.14 feet at 515 a.m. EST on the 12th. The Delaware River at New Hope was above its 13 foot flood stage from 340 a.m. EST through 755 a.m. EST on the 12th. It crested at 13.07 feet at 530 a.m. EST. The Delaware River at Trenton (Mercer County) was above its 20 foot flood stage from 1015 p.m. EST on the 11th through 403 p.m. EST on the 12th. It crested at 20.59 feet at 730 a.m. EST on the 12th. The Neshaminy Creek at Langhorne was above its 9 foot flood stage from 443 a.m. EST through 10 a.m. EST on the 11th. It crested at 9.51 feet at 730 a.m. EST.

Precipitation event totals included 2.18 inches in Furlong, 2.08 inches in Doylestown and 1.42 inches in Penndel.

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 Pennsylvania in 2011 Every state in 2011 This day in weather history Warnings in Pennsylvania, March 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: 293601, 293587, 293606, 293581, 293583, 293599, 293579, 293577, 293591, 293603, 293595.