Alert archive / Pennsylvania / River Flood Warnings in 2009

River Flood Warning 35, NWS Philadelphia/Mount Holly

December 26, 2009Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 26, 2009, 2:42 PM EST for Bucks County, Pennsylvania. It took effect at Dec 26, 2009, 6:08 PM EST. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued
Dec 26, 2009, 2:42 PM EST (19:42 UTC)
In effect from
Dec 26, 2009, 6:08 PM EST
Expired
Dec 27, 2009, 10:13 AM EST
In force
16 hr
Issued by
NWS Philadelphia/Mount Holly
Flood severity
Minor

County Bucks County, PA

The radar

The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 19:44 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Neshaminy Creek near Langhorne (LNGP1). The gauge peaked at 8.29 ft at Dec 26, 2009, 3:00 PM EST.

actionminormoderate051012/2612/2712/28
Action stage
8 ft
Minor stage
9 ft
Moderate stage
12 ft
Major stage
14 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01465500, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS41 KPHI 261942
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
242 PM EST SAT DEC 26 2009

...THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A FLOOD 
WARNING FOR THE FOLLOWING RIVERS IN PENNSYLVANIA... 

  NESHAMINY CREEK AT LANGHORNE AFFECTING BUCKS COUNTY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...DO NOT ATTEMPT TO DRIVE THROUGH FLOODED AREAS. THE 
WATER MAY BE DEEPER THAN YOU THINK.

&&

PAC017-270142-
/O.NEW.KPHI.FL.W.0035.091226T2308Z-091227T0651Z/
/LNGP1.1.ER.091226T2308Z.091227T0000Z.091227T0051Z.NO/
242 PM EST SAT DEC 26 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A 

* FLOOD WARNING FOR 
  THE NESHAMINY CREEK AT LANGHORNE.
* FROM THIS EVENING TO LATE TONIGHT...OR UNTIL THE WARNING IS CANCELLED.
* AT 2:15 PM SATURDAY THE STAGE WAS 8.1 FEET. 
* MINOR FLOODING IS FORECAST. 
* FLOOD STAGE IS 9.0 FEET. 
* FORECAST...RISE ABOVE FLOOD STAGE EARLY THIS EVENING AND CONTINUE TO
  RISE TO NEAR 9.2 FEET LATE THIS EVENING. THE RIVER WILL FALL BELOW FLOOD 
  STAGE AROUND MIDNIGHT.
* IMPACT...AT 9.0 FEET...FLOOD STAGE REACHED WITH SOME HOMES FLOODED IN 
  LANGHORNE TERRACE

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

NESHAMINY CREEK
  LANGHORNE        9.0    8.09  SAT 2 PM     9.2  SAT 7 PM 

&&
1 follow-up statement
000 
WGUS81 KPHI 270125
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
825 PM EST SAT DEC 26 2009

...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS IN 
PENNSYLVANIA...
 
  NESHAMINY CREEK AT LANGHORNE AFFECTING BUCKS COUNTY 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...DO NOT ATTEMPT TO DRIVE THROUGH FLOODED AREAS. THE 
WATER MAY BE DEEPER THAN YOU THINK.

&&

PAC017-271125-
/O.EXT.KPHI.FL.W.0035.000000T0000Z-091227T1513Z/
/LNGP1.1.ER.091227T0208Z.091227T0300Z.091227T0913Z.NO/
825 PM EST SAT DEC 26 2009

THE FLOOD WARNING CONTINUES FOR 
  THE NESHAMINY CREEK AT LANGHORNE.
* UNTIL SUNDAY MORNING...OR UNTIL THE WARNING IS CANCELLED.
* THE LATEST STAGE WAS UNAVAILABLE DUE TO A GAGE MALFUNCTION. 
* MINOR FLOODING IS FORECAST. 
* FLOOD STAGE IS 9.0 FEET. 
* FORECAST...RISE TO NEAR 9.7 FEET AROUND MIDNIGHT. THE RIVER WILL FALL BELOW 
  FLOOD STAGE AROUND DAYBREAK SUNDAY.
* IMPACT...AT 10.0 FEET...AT THIS LEVEL SOME HOMES IN THE AREA OF THE 
  LANGHORNE GAGE ARE EVACUATED

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

NESHAMINY CREEK
  LANGHORNE        9.0    7.44  SAT 7 PM     9.7  SAT 10 PM

&&

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 26, 7:42 AM ESTCoastal Flood AdvisoryPHIDelaware, Philadelphia15 hr
Dec 26, 10:28 AM ESTAreal Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia20 hr
Dec 26, 12:31 PM ESTRiver Flood WarningPHIChester12 hr
Dec 26, 12:34 PM ESTRiver Flood WarningPHIDelaware9 hr
Dec 26, 2:45 PM ESTRiver Flood WarningPHIChester, Delaware17 hr

Nearby

River Flood Warnings in Pennsylvania, 2009Every river flood warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.