Alert archive / Pennsylvania / River Flood Warnings in 2009

River Flood Warning 33, NWS Philadelphia/Mount Holly

December 26, 2009Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 26, 2009, 12:34 PM EST for Delaware County, Pennsylvania. It took effect at Dec 26, 2009, 12:54 PM EST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Dec 26, 2009, 12:34 PM EST (17:34 UTC)
In effect from: Dec 26, 2009, 12:54 PM EST
Expired: Dec 26, 2009, 9:39 PM EST
In force: 9 hr
Issued by: NWS Philadelphia/Mount Holly
Flood severity: Minor

County Delaware County, PA

The radar

The Philadelphia radar (KDIX), 84 km from the middle of the area, began a volume at 17:37 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 Chester Creek near Chester (CHSP1). The gauge peaked at 8.62 ft at Dec 26, 2009, 7:00 PM EST.

Action stage: 7 ft
Minor stage: 8 ft
Moderate stage: 10 ft
Major stage: 14 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01477000, 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 261734
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
1234 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... 

  CHESTER CREEK NEAR CHESTER AFFECTING DELAWARE COUNTY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC045-262334-
/O.NEW.KPHI.FL.W.0033.091226T1754Z-091227T0538Z/
/CHSP1.1.ER.091226T1754Z.091226T2000Z.091226T2338Z.NO/
1234 PM EST SAT DEC 26 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A 

* FLOOD WARNING FOR 
  THE CHESTER CREEK NEAR CHESTER.
* UNTIL LATE TONIGHT...OR UNTIL THE WARNING IS CANCELLED.
* AT 12:15 PM SATURDAY THE STAGE WAS 7.7 FEET. 
* MINOR FLOODING IS FORECAST.
* FLOOD STAGE IS 8.0 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE EARLY THIS AFTERNOON AND CONTINUE
  TO RISE TO NEAR 8.5 FEET BY LATE THIS AFTERNOON. THE RIVER WILL FALL 
  BELOW FLOOD STAGE BY THIS EVENING.
* IMPACT...AT 10.5 FEET...FLOOD DAMAGE BEGINS IN THE CITY OF CHESTER.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

CHESTER CREEK
  CHESTER          8.0    7.69  SAT 12 PM    8.5  SAT 3 PM 

&&

2 follow-up statements

000 
WGUS81 KPHI 262320
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
620 PM EST SAT DEC 26 2009

...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS IN 
PENNSYLVANIA...
 
  CHESTER CREEK NEAR CHESTER AFFECTING DELAWARE COUNTY 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC045-270753-
/O.EXT.KPHI.FL.W.0033.000000T0000Z-091227T0753Z/
/CHSP1.1.ER.091226T1827Z.091227T0000Z.091227T0153Z.NO/
620 PM EST SAT DEC 26 2009

...FLOOD WARNING EXTENDED UNTIL LATE TONIGHT...THE FLOOD WARNING 
CONTINUES FOR
  THE CHESTER CREEK NEAR CHESTER.
* UNTIL LATE TONIGHT...OR UNTIL THE WARNING IS CANCELLED.
* AT 6:01 PM SATURDAY THE STAGE WAS 8.2 FEET. 
* MINOR FLOODING IS OCCURRING AND MINOR FLOODING IS FORECAST. 
* FLOOD STAGE IS 8.0 FEET.
* FORECAST...THE RIVER WILL CONTINUE RISING TO NEAR 8.4 FEET BY THIS 
  EVENING. THE RIVER WILL FALL BELOW FLOOD STAGE AROUND MIDNIGHT.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

CHESTER CREEK
  CHESTER          8.0    8.20  SAT 6 PM     8.4  SAT 7 PM 

&&

000 
WGUS81 KPHI 270239
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
939 PM EST SAT DEC 26 2009

...THE FLOOD WARNING IS CANCELLED FOR THE FOLLOWING RIVERS IN 
PENNSYLVANIA...
 
  CHESTER CREEK NEAR CHESTER AFFECTING DELAWARE COUNTY
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC045-270309-
/O.CAN.KPHI.FL.W.0033.000000T0000Z-091227T0753Z/
/CHSP1.1.ER.091226T1827Z.091227T0015Z.091227T0226Z.NO/
939 PM EST SAT DEC 26 2009

THE FLOOD WARNING IS CANCELLED FOR
  THE CHESTER CREEK NEAR CHESTER.
* AT  9:40 PM SATURDAY THE STAGE WAS 7.93 FEET. 
* FELL BELOW FLOOD STAGE AT 9:30 PM SATURDAY.
* FLOOD STAGE IS 8.0 FEET.
* FORECAST...THE RIVER WILL CONTINUE TO FALL TO 3.6 FEET BY MONDAY 
  MORNING.


$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

CHESTER CREEK
  CHESTER          8.0    7.93  SAT 940 PM    CRESTED AT 8.63 FT AT 7 PM.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 26, 7:42 AM EST	Coastal Flood Advisory	PHI	Delaware, Philadelphia	15 hr
Dec 26, 10:28 AM EST	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	20 hr
Dec 26, 12:31 PM EST	River Flood Warning	PHI	Chester	12 hr
Dec 26, 2:42 PM EST	River Flood Warning	PHI	Bucks	20 hr
Dec 26, 2:45 PM EST	River Flood Warning	PHI	Chester, Delaware	17 hr

Nearby

River Flood Warnings in Pennsylvania, 2009 Every 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.