Flooding in Pennsylvania, April 15 to 16, 2007

Name: Flooding in Pennsylvania, April 15 to 16, 2007
Start: 2007-04-15T08:01
End: 2007-04-16T20:07
Location: Pennsylvania

April 15 to 16, 2007 · NWS PHI · 10 events in 10 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: $1.0 million
Crop damage: None recorded
Events: 10

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.

An intense nor'easter brought heavy rain and flooding to Eastern Pennsylvania on the 15th and strong to high winds as well as some snow to the region on the 16th. Numerous streams and rivers flooded, but the flooding along the Delaware River was minimal. Many roadways were closed due to flooding. Many basements were also flooded. There were a small number of mainly voluntary evacuations. About 25 major roadways around the greater Philadelphia Metropolitan area were closed due to flooding.|Rain began falling throughout the area during the late evening on the 14th. It started briefly as snow over some of the higher terrain of the Poconos. The rain fell at its heaviest across the Lehigh Valley and the Poconos from about 3 a.m. EDT on the 15th into the evening. Precipitation changed to snow over the higher terrain shortly after midnight EDT on the 16th while a mixture of rain and snow (during heavier bursts) continued in the valleys through the morning. Precipitation ended during the afternoon and early evening. Elsewhere across Eastern Pennsylvania, the rain fell at its heaviest from about 3 a.m. EDT on the 15th to about 3 a.m. EDT on the 16th. As the upper air disturbance moved across southeast Pennsylvania, the rain did change to snow for a couple of hours around sunrise on the 16th and accumulated about an inch or two on grassy areas. The steady precipitation ended during the afternoon and early evening on the 16th. Event precipitation totals averaged 3 to 6 inches. Event snowfall totals were an inch or two in most areas, except for 3 to 6 inches in the higher terrain of the Poconos. |The strongest winds occurred as the nor'easter pulled northeast of the region on the 16th from the early morning into the afternoon. The combination of the heavy rain, even some snow and the winds helped knock down numerous trees and power lines. PECO Energy reported about 80,000 of its southeastern Pennsylvania customers lost power. More than 50 major roads were closed in southeastern Pennsylvania because of downed trees. also in Southeastern Pennsylvani, five SEPTA Regional Rail Service Lines had service interruptions on the 16th. Pennsylvania Power and Light reported about 77,000 of its customers lost power in Eastern Pennsylvania and about 65,000 homes and businesses lost power in the Lehigh Valley. Peak wind gusts averaged around 50 mph.|The combination of the snow, wind (power outages) and flooding (more so in the local Philadelphia area) caused many school districts to either cancel classes or have delayed openings on the 16th. The nor'easter was so nasty that even the Internal Revenue Service extended the tax deadline for 48 hours. |The nor'easter low pressure system initially formed in the southern Rockies on the 12th and moved to Arkansas on the morning of the 14th. At 8 p.m. EDT on the 14th, there were two low pressure systems, one in Kentucky and the other in western Alabama. The southern low pressure system became the predominate one overnight and at 8 a.m. EDT on the 15th, it (996 millibar low) was located in western North Carolina. As the 15th continued, it moved northeast and intensified rapidly. At 2 p.m. EDT the nor'easter (989 millibars) was near Raleigh, North Carolina. At 8 p.m. EDT, the nor'easter was a 979 millibar low pressure system near Virginia Beach, Virginia. Another low pressure system formed on its warm front during the afternoon over Chesapeake Bay and at 8 p.m. EDT it (982 millibars) was over extreme southwest New Jersey. The lows consolidated into one again overnight and a very intense 973 millibar low pressure system was located over Monmouth County, New Jersey at 2 a.m. EDT on the 16th. At 8 a.m. EDT on the 16th the nor'easter was down to 968 millibars and located over New York City. That was a drop in central pressure of 28 millibars in 24 hours which qualified it as a meteorological bomb (a drop in central pressure of at least 24 millibars in 24 hours) low pressure system. The nor'easter bottomed at a pressure of about 966 millibars (28.53 inches) at 11 a.m. EDT just south of Long Island, New York. To put into prospective how low the pressure was with this nor'easter, that central pressure is near the border of the pressure defined category 2 and category 3 hurricane once used on the Saffir-Simpson Hurricane Scale. As the 16th continued, the nor'easter weakened and meandered across southwest New England and the New York and New Jersey coastal waters. By 2 a.m. EDT on the 17th, the nor'easter's central pressure rose to 988 millibars and a second storm formed on the triple point of its fronts south of Nova Scotia. This became the main low pressure system. The low pressure system then slowly moved southeast over the next couple of days. The heaviest precipitation fell as the low pressure system was rapidly intensifying on the 15th into the early part of the 16th. The strongest winds ceased after the low pressure system started to fill on the afternoon of the 16th.

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 15, 3:07 AM EST, 4 hours 54 minutes earlier.

Area forecast discussion, Apr 15, 3:07 AM EST, 4 hours 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
407 AM EDT SUN APR 15 2007

.SYNOPSIS...
LOW PRESSURE/A STORM SYSTEM...WILL CONTINUE TO INTENSIFY AS IT
MOVES THROUGH THE CAROLINAS AND EASTERN VIRGINIA TODAY, THEN
REACHES THE SOUTHERN NEW JERSEY COAST THIS EVENING ON ITS WAY TO
LONG ISLAND BY LATE TONIGHT. THE STORM WILL THEN MEANDER OFF THE
NORTHEAST COAST INTO TUESDAY MORNING BEFORE HEADING OUT TO SEA BY
WEDNESDAY.

&&

.NEAR TERM /THROUGH TONIGHT/...
ALTHOUGH SOME SNOW WAS FALLING OVER THE HIGHER ELEVATIONS OF THE
POCONOS AND NW NJ, AS TEMPERATURES DROPPED RAPIDLY WITH THE ONSET
OF PCPN. NOW THAT TEMPS HAVE SETTLED DOWN IN THIS AREA, WARM
ADVECTION SHOULD ALLOW THE SNOW TO CHANGE TO RAIN EARLY THIS
MORNING WITH PERHAPS AN INCH OR TWO ACCUMULATION AT THE HIGHER
ELEVATIONS.

OTHERWISE...RAIN HAS OVERSPREAD THE REGION AND RADAR CONTINUES TO
SUPPORT THE COMPUTER PROGS THAT THE RAINFALL INTENSITY WILL
CONTINUE TO INCREASE. THE STORM IS EMBEDDED WITHIN A NEGATIVELY
TILTED DIFLUENT UPPER AIR SYSTEM WITH STRONG DYNAMICS. THIS MEANS
THAT THE HEAVY RAIN FORECAST CONTINUES TO LOOK GOOD. WE EXPECTED
WIDESPREAD 2 TO 3 INCH AMOUNTS AND SOME 4 INCHERS ARE POSSIBLE.

THIS AFTERNOON...MODELS SUGGEST A WARM SECTOR MAKING IT INTO THE
SOUTHERN MOST AREAS. HOWEVER, WITH THE COLD OCEAN, THIS WARMER AIR
PROBABLY WONT BE SEEN ON THE GROUND AND WILL BE LIFTED ABOVE THE
MARITIME LAYER. EVEN SO, THERE WILL BE WARMER AIR AROUND AND TSTMS
COULD DEVELOP AS THE COLD FRONT COMES IN FROM THE WEST. WINDS
ALOFT WILL CONTINUE TO BE STRONG AND IF TSTMS DO FORM, SOME OF THE
STRONG WINDS MIGHT MIX DOWN POSSIBLY CAUSING A SVR TSTM.

TONIGHT, A TROWEL LOOKS LIKE IT DEVELOPS ON THE NW QUADRANT OF THE
LOW AS COLD AIR ARRIVES. EVENTUALLY IT GETS COLD ENOUGH TO CHANGE
THE RAIN TO SNOW NORTH LATE TONIGHT OVER THE NORTHERN AREAS. OVER
THE REST OF THE REGION, THE PCPN SHOULD BECOME MORE SHOWERY WITH
LESS LIFT ALOFT AND WITH THE COLDER AIR RETURNING, SOME OF THE
SHOWERS...EVEN SOUTH COULD BE MIXED WITH SNOW.

A WIND ADVISORY HAS ALSO BEEN ISSUED FOR THE NJ AND DE COASTS.
ONSHORE GALE FORCE WINDS SHOULD CAUSE WIND GUSTS TO 50 MPH.

&&

.SHORT TERM /MONDAY THROUGH WEDNESDAY/...
ON MONDAY...SNOW IS EXPECTED NORTH. HOWEVER, IT IS QUESTIONABLE
HOW MUCH FALLS AND WILL DEPEND ON HOW MUCH MOISTURE REMAINS WITH
THE TROWEL. THE TROWEL LIFTS TO THE NORTH LATE IN THE DAY AND EVEN
THE NORTHERN AREAS SHOULD SEE THE SNOW BECOME SHOWERY. USING THE
GFS SOUNDINGS AS A GUIDE, NRN NJ WILL BE THE LAST TO GET THE COLD
AIR AND CHANGE TO SNOW...THEREFORE, DUE TO THE LONGER DURATION OF
THE RAIN THERE, I DID NOT EXTEND THE WINTER STORM WATCH INTO EVEN
SUSSEX COUNTY NJ.

TUESDAY THROUGH WEDNESDAY WE REMAIN UNDER WEAKENING CYCLONIC FLOW
ALOFT. THE AIRMASS WILL BE UNSTABLE AND COLD ALLOWING RAIN OR SNOW
SHOWERS TO DEVELOP, MAINLY ON TUESDAY. THE BIGGEST EFFECT WILL BE
THE WINDY CONDITIONS AS SOME OF THE WINDS FROM ALOFT MIX DOWN, ESP
ON TUESDAY.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/...
THE WEATHER CAN BE EXPECTED TO CONTINUE TO IMPROVE. ALSO, MOST OF
THE COLD AIR WILL BE GONE BY THE WEEKEND AS TEMPERATURES MODERATE
BACK TO NORMAL.

&&

.AVIATION...
THE MUCH ADVERTISED STORM IS UPON US, ALBEIT ITS MOVEMENT IS A
LITTLE SLOWER THAN ORIGINALLY EXPECTED.  LOCAL TAF SITES GENERALLY
MVFR/IFR CIGS AND EITHER VFR OR MVFR VSBYS.  HOWEVER, CONDITIONS ARE
EXPECTED TO FURTHER DETERIORATE TOWARD DAYBREAK WITH IFR/LIFR
CONDITIONS EXPECTED WITH SOME HEAVY RAIN.  STRONG E TO NE WINDS ARE
EXPECTED TO DEVELOP AHEAD OF THE LOW, EVEN THOUGH THIS HAS NOT COME
TO FRUITION SO FAR.  WINDS WILL THEN TURN AROUND TO THE NW AROUND
00Z AND WILL REMAIN HIGH OR GET EVEN HIGHER DURING THE DAY MONDAY.
THE RAIN WILL TAPER OFF AND BECOME MORE SHOWERY TONIGHT INTO MONDAY,
BUT TEMPS WILL BE COLD ENOUGH TO SUPPORT SOME SNOW SHOWERS AS WELL.
&&

.MARINE...
WITH THE SLOWER PROGRESSION OF THE STORM, THE MARINE AREA STILL
REMAINS RELATIVELY QUIET EARLY THIS MORNING.  HOWEVER CONDITIONS
WILL BE CHANGING AS THE LOW APPROACHES AND THEN RE-EMERGES OFF THE
COAST.

WINDS AND SEAS WILL BEGIN TO INCREASE AND GALE FORCE GUSTS WILL
BECOME LIKELY. AS THE LOW MOVES SLOWLY UP THE MID ATLANTIC COAST
SUNDAY INTO SUNDAY NIGHT, WINDS WILL DROP OFF SOMEWHAT. BUT AS THE
LOW CONTINUES TO MOVE SLOWLY N INTO SOUTHERN NEW ENGLAND, THE TIGHT
PRESSURE GRADIENT ON THE BACKSIDE OF THE SYSTEM WILL MOVE OVER OUR
AREA CAUSING WINDS TO ONCE AGAIN INCREASE TO GALE FORCE, THIS TIME
FROM THE NORTHWEST. THE LOW WILL LINGER OVER THE NERN CONUS BEFORE
HEADING OUT TO SEA TUESDAY.  THIS WILL KEEP GALE FORCE GUSTS AT
LEAST THROUGH MONDAY AND PROBABLY WELL INTO MONDAY NIGHT.

&&

.TIDES...
THE COASTAL FLOOD WARNING REMAINS IN EFFECT, EVEN THOUGH THE BIGGEST
PROBLEMS NOW APPEAR WITH THE AFTERNOON HIGH TIDE.  AGAIN, WITH THE
SLOWER PROGRESSION OF THE STORM, WE ARE JUST AWAITING THINGS TO RAMP
UP.  HIGH ASTRONOMICAL TIDES WILL COMBINE WITH THE STRONG ONSHORE
FLOW TO PRODUCE MINOR TO MODERATE FLOODING AROUND THE TIMES OF HIGH
TIDE. ANY FLOODING WILL BE EXACERBATED BY THE HEAVY RAINFALL. BACK
BAYS WILL ALSO HAVE TIDAL FLOODING, BECAUSE OF THE HEAVY RAIN AND
THE DIFFICULTY IN DRAINING. THE TIMING OF THE MOVEMENT OF THE LOW
WILL DETERMINE WHAT AREAS WILL HAVE MODERATE FLOODING DURING THE
EVENING TIDES. IT APPEARS THAT THE LOW WILL BE CENTERED SOMEWHERE
ALONG THE CENTRAL OR NORTHERN NEW JERSEY COAST BY EVENING. THIS WILL
GIVE THE AREAS NEAR AND NORTH OF THE CENTER THE BEST CHANCES FOR
MODERATE TIDAL FLOODING AT THAT TIME. AS THE STORM MOVES SLOWLY OFF
TO THE NORTH, W TO NW WINDS ON THE BACKSIDE OF THE SYSTEM WILL
INCREASE TO GALE FORCE AND POSSIBLY PRODUCE BLOWOUT CONDITIONS
MONDAY INTO TUESDAY.

&&

.HYDROLOGY...
THE FLOOD WATCH IS DEFINATELY WARRANTED, ESPECIALLY FROM
ILG-PHL-TTN NORTHWARD. IN THESE AREAS 1.5 INCHES WILL PROBABLY
START FLOODING ON SMALLER STREAMS. THESE VALUES COULD BE REACHED
EARLY THIS MORNING WITH HEAVY RAIN ALREADY IN PLACE. ANYONE LIVING
NEAR STREAMS OR IN POOR DRAINAGE AREAS SHOULD PREPARED TO TAKE
ACTION IF FLOOD OR FLASH FLOOD WARNINGS ARE ISSUED.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...FLOOD WATCH THROUGH MONDAY MORNING FOR PAZ060>062-067>071.
     COASTAL FLOOD WARNING UNTIL 2 AM EDT MONDAY FOR PAZ070-071.
     WINTER STORM WATCH FROM LATE TONIGHT THROUGH MONDAY EVENING
     FOR PAZ054-055.
NJ...FLOOD WATCH THROUGH MONDAY MORNING FOR NJZ001-007>010-012>027.
     COASTAL FLOOD WARNING UNTIL 2 AM EDT MONDAY FOR NJZ012>014-
     016>027.
     WIND ADVISORY FROM 8 AM THIS MORNING TO 6 PM EDT THIS
     AFTERNOON FOR NJZ014-024>026.
DE...FLOOD WATCH THROUGH MONDAY MORNING FOR DEZ001>004.
     COASTAL FLOOD WARNING UNTIL 2 AM EDT MONDAY FOR DEZ001>004.
     WIND ADVISORY FROM 8 AM THIS MORNING TO 6 PM EDT THIS
     AFTERNOON FOR DEZ004.
MD...FLOOD WATCH THROUGH MONDAY MORNING FOR MDZ008-012-015-019-020.
MARINE...GALE WARNING UNTIL 8 PM EDT MONDAY FOR ANZ430-431-450>455.

&&

SYNOPSIS...RNS
NEAR TERM...RNS
SHORT TERM...RNS
LONG TERM...RNS
AVIATION...LN
MARINE...LN
HYDROLOGY...RNS
TIDES/COASTAL FLOODING...LN

Hazardous weather outlook, Apr 15, 2:39 AM EST, 5 hours 22 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
339 AM EDT SUN APR 15 2007

MDZ008-012-015-019-020-NJZ001-007>010-015-PAZ060>062-067>069-160745-
CECIL-KENT MD-QUEEN ANNES-TALBOT-CAROLINE-SUSSEX-WARREN-MORRIS-
HUNTERDON-SOMERSET-MERCER-BERKS-LEHIGH-NORTHAMPTON-CHESTER-
MONTGOMERY-BUCKS-
339 AM EDT SUN APR 15 2007

...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING...

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

.DAY ONE...TODAY 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

HEAVY RAIN WILL FALL THROUGHOUT THE REGION. WIDESPREAD 2 TO 3 INCH
RAINFALL AMOUNTS ARE EXPECTED.

THUNDERSTORMS COULD DEVELOP THIS AFTERNOON FROM PHILADELPHIA
SOUTHWARD. WITH VERY STRONG WINDS ALOFT, IF THUNDERSTORMS DO
DEVELOP SOME OF THE WINDS FROM ALOFT COULD MIX DOWN AND SEVERE
THUNDERSTORMS CANNOT BE RULED OUT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

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

   FLOOD WATCH INTO EARLY MONDAY MORNING

HEAVY RAIN WILL BE OVER BUT ANY FLOODING THAT DEVELOPS COULD CONTINUE.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

DEZ004-NJZ014-024>026-160745-
DELAWARE BEACHES-EASTERN MONMOUTH-ATLANTIC COASTAL CAPE MAY-
COASTAL ATLANTIC-COASTAL OCEAN-
339 AM EDT SUN APR 15 2007

...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING...
...COASTAL FLOOD WARNING IN EFFECT UNTIL 2 AM EDT MONDAY...
...WIND ADVISORY IN EFFECT FROM 8 AM THIS MORNING TO 6 PM EDT THIS
AFTERNOON...

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

.DAY ONE...TODAY 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
   WIND ADVISORY

HEAVY RAIN WILL FALL THROUGHOUT THE REGION. WIDESPREAD 2 TO 3 INCH
RAINFALL AMOUNTS ARE EXPECTED.

THUNDERSTORMS COULD DEVELOP THIS AFTERNOON SOUTH OF LITTLE EGG
INLET NJ. WITH VERY STRONG WINDS ALOFT, IF THUNDERSTORMS DO
DEVELOP SOME OF THE WINDS FROM ALOFT COULD MIX DOWN AND SEVERE
THUNDERSTORMS CANNOT BE RULED OUT.

A COASTAL FLOOD WARNING CONTINUES. ANY FLOODING SHOULD BE WORSE
THE FURTHER NORTH ONE GETS. THIS MORNING, MOSTLY MINOR FLOODING IS
EXPECTED WITH THE HIGH TIDE. THIS AFTERNOON, MODERATE FLOODING IS
ANTICIPATED, ESPECIALLY TO THE NORTH OF ATLANTIC CITY.

STRONG ONSHORE WINDS WILL GUST TO 50 MPH AT TIMES TODAY SO A WIND
ADVISORY HAS BEEN ISSUED.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

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

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

DEZ001>003-NJZ012-013-016>023-027-PAZ070-071-160745-
NEW CASTLE-KENT DE-INLAND SUSSEX-MIDDLESEX-WESTERN MONMOUTH-SALEM-
GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-
CAPE MAY-SOUTHEASTERN BURLINGTON-DELAWARE-PHILADELPHIA-
339 AM EDT SUN APR 15 2007

...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING...
...COASTAL FLOOD WARNING IN EFFECT UNTIL 2 AM EDT MONDAY...

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

.DAY ONE...TODAY 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

HEAVY RAIN WILL FALL THROUGHOUT THE REGION. WIDESPREAD 2 TO 3 INCH
RAINFALL AMOUNTS ARE EXPECTED.

THUNDERSTORMS COULD DEVELOP THIS AFTERNOON SOUTH OF LITTLE EGG
INLET NJ. WITH VERY STRONG WINDS ALOFT, IF THUNDERSTORMS DO
DEVELOP SOME OF THE WINDS FROM ALOFT COULD MIX DOWN AND SEVERE
THUNDERSTORMS CANNOT BE RULED OUT.

A COASTAL FLOOD WARNING CONTINUES. ANY FLOODING SHOULD BE WORSE
THE FURTHER NORTH ONE GETS. THIS AFTERNOON, MODERATE FLOODING IS
ANTICIPATED.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

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

   FLOOD WATCH

HEAVY RAIN WILL BE OVER BUT ANY FLOODING THAT DEVELOPS COULD CONTINUE.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

PAZ054-055-160745-
CARBON-MONROE-
339 AM EDT SUN APR 15 2007

...WINTER STORM WATCH IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT

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

   WINTER STORM WATCH LATE TONIGHT

SOME SNOW WILL FALL AT THE HIGHER ELEVATIONS THIS MORNING AND MAY
ACCUMULATE AN INCH OR TWO BEFORE CHANGING TO RAIN. THE RAIN WILL
CHANGE BACK TO SNOW LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

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

   WINTER STORM WATCH

SNOW IS EXPECTED MONDAY WITH ACCUMULATIONS OF 6 INCHES POSSIBLE
MAINLY AT THE HIGHER ELEVATIONS.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

ANZ430-431-450>455-160745-
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-
339 AM EDT SUN APR 15 2007

...GALE WARNING IN EFFECT UNTIL 8 PM EDT MONDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS.

.DAY ONE...TODAY 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...MONDAY THROUGH SATURDAY

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

   GALE WARNING

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

RNS

In the hours before

Special weather statement, Apr 15, 7:53 AM EST, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
853 AM EDT SUN APR 15 2007

NJZ001-PAZ054-055-151600-
SUSSEX-CARBON-MONROE-
INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG
853 AM EDT SUN APR 15 2007

A VARIETY OF PRECIPITATION IS BEING REPORTED ACROSS THE POCONOS
AND NORTHWESTERN NEW JERSEY THIS MORNING. WHILE MOST AREAS WILL
SEE RAIN TODAY, HIGHER ELEVATIONS WILL LIKELY SEE A PERIOD OF SNOW
OR SLEET MIXING IN AT TIMES DURING THE MORNING HOURS. THERE MAY BE
A SLIGHT ACCUMULATION, BUT AS THE PRECIPITATION CHANGES BACK TO
RAIN, THIS ACCUMULATION SHOULD THEN MELT. AREAS OF FOG MAY ALSO
DEVELOP TODAY, REDUCING VISIBILITIES BELOW ONE MILE MAKING DRIVING
VERY DANGEROUS. MOTORISTS ARE URGED TO USE CAUTION WHILE DRIVING, AND
ALLOW EXTRA TIME TO GET TO THEIR DESTINATION.

ROBERTSON

The radar

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

Open the radar archive at this moment

Event by event

10 flood. Local standard time, as filed.

Flood, Chester

When: April 15, 8:01 AM EST to April 16, 8:07 PM EST
Where: Chester County, Elverson to Chadds Ford Jct
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 40.170, -75.830

The flooding in Chester County was centered around the Brandywine Creek at its tributaries. Along the main stem of the Brandywine, Pennsylvania State Routes 926 and 100 were closed in Pocopson Township, State Route 100 and Creek Road were closed in Birmingham Township and Brandywine Creek Road was closed in East Bradford Township. Flood waters from the Brandywine ripped a 50 foot stretch of Brandywine Creek Road in Newlin Township. Flooding problems also occurred around West Chester. Flooding caused a fire at a PECO Energy substation in West Whiteland Township.| |The East Branch of the Brandywine River at Downingtown was above its 7 foot flood stage from 911 a.m. EDT on the 15th through 1112 p.m. EDT on the 15th. It crested at 9.48 feet at 245 p.m. EDT on the 15th. A second shot of heavier rain caused additional flooding the next day. The East Branch of the Brandywine River at Downingtown was above its 7 foot flood stage again from 257 a.m. EDT on the 16th through 420 p.m. EDT on the 16th. It crested at 8.51 feet at 745 a.m. EDT on the 16th. The main stem of the Brandywine Creek at Chadds Ford was above its 9 foot flood stage from 155 p.m. EDT on the 15th through 907 p.m. EDT on the 16th. It crested at 10.46 feet at 1015 p.m. EDT on the 15th. The French Creek at Phoenixville was above its 8 foot flood stage from 1013 a.m. EDT on the 15th through 1200 a.m. EDT on the 16th. It crested at 8.60 feet at 345 p.m. EDT on the 15th. Additional heavy rain caused the creek to flood again the next morning. The French Creek at Phoenixville was above its 8 foot flood stage from 430 a.m. EDT on the 16th through 915 a.m. EDT on the 16th. It crested at 8.16 feet at 345 p.m. EDT on the 16th. The Valley Creek at Valley Forge was above its 7 foot flood stage from 901 a.m. EDT on the 15th through 806 p.m. EDT on the 15th. It crested at 8.08 feet at 315 p.m. EDT on the 15th.|Precipitation totals included 4.97 inches in West Chester, 4.41 inches in Honey Brook, 4.19 inches in Glenmoore, and 3.65 inches in Coatesville. Snow accumulations 2.0 inches in East Nantmeal Township and 0.5 inches in Coatesville.|

Flood, Philadelphia

When: April 15, 8:03 AM EST to April 16, 3:30 PM EST
Where: Philadelphia County, (Phl)philadelphia in
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 39.880, -75.250

The heavy rain led to flooding along the Schuylkill River and smaller creeks within Philadelphia. Kelly and Lincoln Drives near the Schuylkill River were flooded and closed. Flooding was also reported along Roosevelt Boulevard and Flat Rock Road. The heavy rain caused the rest of a retaining wall behind a Lyceum Avenue to collapse. Basements were flooded along the Schuylkill River in the Roxborough section of the city. Flooding was reported along Cobbs Creek, especially at 70th Street and Woodland Avenue. The heavy rain caused many flight delays at the Philadelphia International Airport and about 80 cancelled flights. |The Schuylkill River at Philadelphia was above it 11 foot flood stage from 703 p.m. EDT on the 15th through 430 p.m. EDT on the 16th. It crested at 11.34 feet at 1030 p.m. EDT on the 15th. The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 903 a.m. EDT on the 15th through 1112 a.m. EDT on the 16th. It crested at 10.34 feet at 800 p.m. EDT on the 15th. The Wissahickon Creek at its mouth was above its 5 foot flood stage from 951 a.m. EDT on the 15th through 424 p.m. EDT on the 16th. It crested at 7.32 feet at 745 p.m. EDT on the 15th. Precipitation totals included 6.22 inches in Roxborough, 5.90 inches at the Northeast Philadelphia Airport and 5.09 inches at the Philadelphia International Airport.|

Flood, Delaware

When: April 15, 8:15 AM EST to April 16, 8:07 PM EST
Where: Delaware County, Chadds Ford to Darby
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 39.870, -75.570

The heavy rain caused roadway and basement flooding in Delaware County on the 15th. Flooding approached several homes near Crum Creek in Marple Township. Flooding from Chester Creek inundated four roads within Chester. Two roads were closed because of Brandywine Creek flooding in Chadds Ford. The Darby Creek flooded parking lots off of Mill Street and Walnut Street in Darby Borough and Hook Road in Darby Township. Pennsylvania State Route 291 was closed between Eddystone and Ridley Township and the ramps to Interstate 95 were flooded in Yeadon Borough. Flooding was also reported along Cobbs Creek along the border with Philadelphia. Trolley tracks were under water on the Sharon Hill-102 line between Collingdale and Sharon Hill. |The Brandywine Creek at Chadds Ford was above its 9 foot flood stage from 155 p.m. EDT on the 15th through 907 p.m. EDT on the 16th. It crested at 10.46 feet at 1015 p.m. EDT on the 15th. The Chester Creek at Chester was above its 8 foot flood state from 934 a.m. EDT through 1034 p.m. EDT on the 15th. It crested at 10.42 feet at 800 p.m. EDT on the 15th. The Crum Creek at Newtown Square was above its 6 foot flood stage from 932 a.m. EDT on the 15th through 651 p.m. EDT on the 15th. It crested at 7.23 feet at 300 p.m. EDT on the 15th.|Precipitation totals included 6.04 inches in Media, 6.00 inches in Boothwyn, and 5.60 inches in Drexel Hill. Snowfall totals included 1.5 inches in both Drexel Hill and Havertown.

Flood, Montgomery

When: April 15, 9:06 AM EST to April 16, 12:41 PM EST
Where: Montgomery County, East Greenville to Narberth
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 40.420, -75.500

Heavy rain caused flooding along low lying areas and roadways near the Schuylkill River as well as mainly in the Perkiomen,Pennypack and Wissahickon Basins. About a dozen major roadways were closed due to flooding. Creek flooding also closed some smaller roadways. The Schuylkill River forced the closure of roadways in Conshohocken, Lower Merion, West Norriton and Norristown. Creek flooding closed roadways in Lower Moreland, Skippack, Upper Frederick, Upper Merion, Upper Moreland and Whitemarsh Townships. |The Schuylkill River in Philadelphia was above it 11 foot flood stage from 703 p.m. EDT on the 15th through 430 p.m. EDT on the 16th. It crested at 11.34 feet at 1030 p.m. EDT on the 15th. The Manatawny Creek at Pottstown was above its 6 foot flood stage from 1252 p.m. EDT through 957 p.m. EDT on the 15th. it crested at 6.67 feet at 345 p.m. EDT. Additional heavy rain overnight forced the Manatawny Creek over its banks again. The Manatawny Creek at Pottstown was again over its 6 foot flood stage from 603 a.m. EDT through 852 a.m. EDT on the 16th. It crested at 6.11 feet at 7 a.m. EDT. The East Branch of the Perkiomen at Schwenksville was above its 7 foot flood stage from 1006 a.m. EDT on the 15th through 141 p.m. EDT on the 16th. It crested at 9.3 feet at 500 p.m. EDT on the 15th. The main stem of the Perkiomen Creek at East Greenville was above its 4 foot flood stage from 103 p.m. EDT on the 15th through 648 p.m. EDT on the 15th. It crested at 4.21 feet at 430 p.m. EDT on the 15th. Additional heavy rain caused the Perkiomen to flood the following morning. The Perkiomen Creek at East Greenville was above its 4 foot flood stage from 521 a.m. EDT on the 16th through 831 a.m. EDT on the 16th. It crested at 4.26 feet at 700 a.m. EDT on the 16th. Farther downstream, the Perkiomen Creek at Graterford was above its 11 foot flood stage from 142 p.m. EDT on the 15th through 1220 p.m. EDT on the 16th. It crested at 12.43 feet at 630 p.m. EDT on the 15th. The Wissahickon Creek at Fort Washington was above its 9 foot flood stage from 847 a.m. EDT on the 15th through 134 a.m. EDT on the 16th. It crested at 11.17 feet at 515p.m. EDT on the 15th. Additional heavy rain caused the Wissahickon to flood the following morning. The Wissahickon Creek at Fort Washington was above its 9 foot flood stage from 424 a.m. EDT on the 16th through 1001 a.m. EDT on the 16th. It crested at 10.75 feet at 615 a.m. EDT on the 16th.|Precipitation totals included 5.63 inches in Norristown, 4.99 inches in Souderton, 4.69 inches in Wynnewood, 4.67 inches in Eagleville, 4.44 inches in Hatboro, and 4.15 inches in Pottstown. Snowfall totals included 1.5 inches in Rosemont and Wynnewood.|

Flood, Berks

When: April 15, 10:02 AM EST to April 16, 8:30 AM EST
Where: Berks County, Bethel to Bally
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 40.470, -76.300

Heavy rain caused flooding twice along the Manatawny Creek on the 15th and 16th. The Manatawny Creek at Spangville was above its 6 foot flood stage from 1102 am EDT on the 15th through 902 pm EDT on the 15th. It crested at 6.39 feet at 215 pm EDT on the 15th. Additional heavy rain caused the creek to flood the following morning. The Manatawny Creek at Spangville again was above its 6 foot flood stage from 540 am EDT on the 16th through 130 pm EDT on the 16th. It crested at 6.14 feet at 745 am EDT on the 16th. Precipitation totals included 4.58 inches in Hamburg, 3.70 inches in Scarlet’s Mill, 3.03 inches in Fleetwood and 2.69 inches at the Reading Regional Airport.

Flood, Bucks

When: April 15, 10:29 AM EST to April 16, 6:11 PM EST
Where: Bucks County, Quakertown to Bristol
Cause: Heavy Rain
Property damage: $1.0 million
Reported by: Newspaper
Coordinates: 40.450, -75.330

The heavy rain caused flooding across Bucks County with the worst reported flooding along the Neshaminy Creek. Ground floor apartments, roadways and basements flooded in floods prone areas along the creek in Bensalem, Bristol, Middletown, Hulmeville and Northamptom. In Middletown Township, the creek flooded two roadways with six feet of water and vehicles that were not moved along Bridle Drive were totally flooded. |Flooding also occurred along the Delaware River, but mainly roadway and low-lying area as none of the gaged sites along the river reached flood stage. Voluntary evacuations occurred in Falls Township (Wellington Woods Development) and in New Hope (Waterview Development). Road closures and basement flooding occurred along the Delaware River in Bridgeton, Tinicum, New Hope, Upper Makefield, Yardley and Lower Makefield. In Yardley, the Delaware River flooded roadways in the Rivermawr section. |Flooding also severely affected Bristol Township, but was not related to either the Neshaminy Creek or Delaware River. About 50 homes and apartments suffered extensive damage. Twenty homes were inaccessible and family had to be rescued by boat. The Croydon section of the township was hit hard on Spencer, Lincoln, Swan and Dixon Avenues as well as Penn and Franklin Streets. The Lakeview Manor Apartments were evacuated near Silver Lake Park. |Elsewhere in the county, Martins Creek overeflowed in Tullytown and the Tohickon Creek flooded in Bedminster. Roadways were also closed in Buckingham, Doylestown, Perkasie and Upper Southampton.|The Neshaminy Creek at Langhorne was above its 9 foot flood stage from 1129 a.m. EDT on the 15th through 711 p.m. EDT on the 16th. It crested at 14.68 feet at 145 a.m. EDT on the 16th. This was the highest crest since June 17th, 2001.|Precipitation totals included 6.12 inches in Neshaminy Falls, 5.60 inches in Morrisville, 5.51 inches in Doylestown, 5.47 inches in Furlong, 5.26 at Doylestown Airport, 4.96 inches in Perkasie, 4.87 inches in Southampton, 4.70 inches in Springtown, and 3.99 inches in Sellersville.

Flood, Lehigh

When: April 15, 11:00 AM EST to 11:00 PM EST
Where: Lehigh County, Allentown to Macungie
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 40.620, -75.480

The heavy rain caused poor drainage and stream flooding. Flooding along the larger rivers was mainly confined to low lying areas and this included the Lehigh River. Roads were closed in Lower Macungie, North Whitehall and Upper and Lower Milford Townships. All roads in the county were re-opened by the evening of the 16th. Precipitation totals included 3.16 inches at the Lehigh Valley International Airport and 2.23 inches in Slatington. Snowfall accumulations included 1.4 inches in Slatington and a trace at the Lehigh Valley International Airport.

Flood, Northampton

When: April 15, 11:00 AM EST to 11:00 PM EST
Where: Northampton County, Bethlehem to Easton
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 40.630, -75.380

The heavy rain caused poor drainage and stream flooding. Flooding along the larger rivers was mainly confined to low lying areas and this included the Lehigh and Delaware Rivers. Roads were closed in Forks Township, Easton, West Easton, Bethelehem and Bushkill. The Lehigh River overflowed low lying areas of West Easton. The Delaware River overflowed low points in Forks Township. All roads in the county were re-opened by the evening of the 16th. Precipitation totals included 5.91 inches in Glendon and 4.44 inches in Martin’s Creek. Snowfall accumulations included 1.8 inches in Glendon.

Flood, Carbon

When: April 15, 3:00 PM EST to April 16, 12:00 AM EST
Where: Carbon County, East Side to Bowmanstown
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 41.070, -75.780

The heavy rain on the 15th caused creek and poor drainage flooding. Pennsylvania State Route 93 was closed in both Packer and Banks Townships. Precipitation totals included 2.88 in Lehighton.

Flood, Monroe

When: April 15, 3:00 PM EST to April 16, 12:00 AM EST
Where: Monroe County, Blakeslee to East Stroudsburg
Cause: Heavy Rain
Reported by: Newspaper
Coordinates: 41.100, -75.620

The heavy rain on the 15th caused creek and poor drainage flooding as several major roadways were closed in Monroe County. These included Pennsylvania State Route 715 in Jackson Township, 314 in Pocono Township and 534 in Polk Township. The heavy rain caused a mudslide and road closure along Pennsylvania State Route 191 in Stroud Township. Flooding along the Delaware River was confined to low lying areas near the river as none of the gaged sites reached flood stage. The flooding did wash away a golf cart bridge at the Shawnee Place resort. Precipitation totals included 3.10 in Mount Pocono.

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 2007 Every state in 2007 This day in weather history Warnings in Pennsylvania, April 2007

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: 26908, 26913, 26909, 26912, 26906, 26907, 26910, 26911, 28377, 28378.