Alert archive / Pennsylvania / River Flood Warnings in 2008

River Flood Warning 42, NWS Philadelphia/Mount Holly

December 12, 2008Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 12, 2008, 2:41 AM EST for Montgomery County, Pennsylvania. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Dec 12, 2008, 2:41 AM EST (07:41 UTC)
Expired: Dec 12, 2008, 12:22 PM EST
In force: 10 hr
Issued by: NWS Philadelphia/Mount Holly
Flood severity: Minor

County Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 07:43 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 Perkiomen Creek at Graterford (GRAP1). The gauge peaked at 12.91 ft at Dec 12, 2008, 5:00 AM EST.

Action stage: 8 ft
Minor stage: 11 ft
Moderate stage: 13 ft
Major stage: 16 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01473000, 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 120741
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
241 AM EST FRI DEC 12 2008

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

  PERKIOMEN CREEK AT GRATERFORD AFFECTING MONTGOMERY COUNTY

...MINOR FLOODING IS OCCURRING AND EXPECTED TO CONTINUE ON THE PERKIOMEN
CREEK...

PAC091-121341-
/O.NEW.KPHI.FL.W.0042.081212T0741Z-081212T2106Z/
/GRAP1.1.ER.081212T0653Z.081212T1200Z.081212T1506Z.NO/
241 AM EST FRI DEC 12 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A 

* FLOOD WARNING FOR 
  THE PERKIOMEN CREEK AT GRATERFORD.
* UNTIL THIS AFTERNOON...OR UNTIL THE WARNING IS CANCELLED.
* AT 2:16 AM FRIDAY THE STAGE WAS 11.5 FEET. 
* MINOR FLOODING IS OCCURRING.
* FLOOD STAGE IS 11.0 FEET. 
* FORECAST...THE RIVER WILL CONTINUE TO RISE TO AROUND 12.5 FEET
  THIS MORNING. 
* IMPACT...AT 13.0 FEET...SEWAGE TREATMENT PLANT IN SWENKSVILLE
  FLOODED

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

PERKIOMEN CREEK
  GRATERFORD       11.0   11.51  FRI 2 AM    12.5  FRI 7 AM 

&&

2 follow-up statements

000 
WGUS41 KPHI 120924
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
424 AM EST FRI DEC 12 2008

...FORECAST FLOODING CHANGED FROM MINOR TO MODERATE SEVERITY FOR THE 
FOLLOWING RIVERS IN PENNSYLVANIA...
  PERKIOMEN CREEK AT GRATERFORD AFFECTING MONTGOMERY COUNTY

...MINOR FLOODING IS OCCURRING AND MODERATE FLOODING IS FORECAST FOR 
PERKIOMEN CREEK...

PAC091-121524-
/O.EXT.KPHI.FL.W.0042.000000T0000Z-081212T2203Z/
/GRAP1.2.ER.081212T0653Z.081212T1200Z.081212T1603Z.NO/
424 AM EST FRI DEC 12 2008

...FORECAST FLOODING INCREASED FROM MINOR TO MODERATE SEVERITY...
THE FLOOD WARNING CONTINUES FOR 
  THE PERKIOMEN CREEK AT GRATERFORD.
* UNTIL THIS AFTERNOON...OR UNTIL THE WARNING IS CANCELLED.
* AT 4:01 AM FRIDAY THE STAGE WAS 12.8 FEET. 
* MINOR FLOODING IS OCCURRING AND MODERATE FLOODING IS FORECAST.
* FLOOD STAGE IS 11.0 FEET. 
* FORECAST...THE RIVER WILL CONTINUE RISING TO NEAR 13.3 FEET THIS 
  MORNING. 
* IMPACT...AT 13.5 FEET...HOUSES ON LEFT BANK IN GRATERFORD FLOODED

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

PERKIOMEN CREEK
  GRATERFORD       11.0   12.76  FRI 4 AM    13.3  FRI 7 AM 

&&

000 
WGUS81 KPHI 121722
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
1222 PM EST FRI DEC 12 2008

...THE FLOOD WARNING IS CANCELLED FOR THE FOLLOWING RIVERS IN 
PENNSYLVANIA...
 
  PERKIOMEN CREEK AT GRATERFORD AFFECTING MONTGOMERY COUNTY
...PERKIOMEN CREEK NOW BELOW FLOOD STAGE...
PAC091-121752-
/O.CAN.KPHI.FL.W.0042.000000T0000Z-081212T2203Z/
/GRAP1.1.ER.081212T0653Z.081212T1045Z.081212T1611Z.NO/
1222 PM EST FRI DEC 12 2008

* AT 12:00 PM FRIDAY THE STAGE OF THE PERKIOMEN CREEK AT
  GRATERFORD WAS 10.0 FEET AND FALLING. 
* FLOOD STAGE IS 11.0 FEET.
* WATER LEVELS ON THE PERKIOMEN CREEK WILL CONTINUE TO FALL
  THIS AFTERNOON, AND NO ADDITIONAL FLOODING IS FORECAST.


$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

PERKIOMEN CREEK
  GRATERFORD       11.0   10.00  FRI 12 PM    9.5  FRI 1 PM 

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 11, 9:32 PM EST	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	12 hr
Dec 11, 9:47 PM EST	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	6 hr
Dec 12, 12:55 AM EST	Areal Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	12 hr
Dec 12, 2:12 AM EST	River Flood Warning	PHI	Berks, Schuylkill	13 hr
Dec 12, 2:48 AM EST	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	6 hr
Dec 12, 3:46 AM EST	River Flood Warning	PHI	Chester	10 hr
Dec 12, 7:45 AM EST	River Flood Warning	PHI	Bucks	7 hr
Dec 12, 8:34 AM EST	Areal Flood Advisory	PHI	Bucks, Carbon, Lehigh, Monroe, Northampton	3 hr
Dec 12, 9:00 AM EST	Coastal Flood Advisory	PHI	Delaware, Philadelphia	6 hr
Dec 12, 9:02 AM EST	River Flood Warning	PHI	Montgomery, Philadelphia	6 hr
Dec 12, 11:17 AM EST	River Flood Warning	PHI	Chester, Delaware	9 hr

Nearby

River Flood Warnings in Pennsylvania, 2008 Every river flood warning in 2008

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.