River Flood Warning 27, NWS Philadelphia/Mount Holly

Issued

Aug 4, 2018, 9:20 AM EDT (13:20 UTC)

In effect from

Aug 4, 2018, 11:21 AM EDT

Expired

Aug 4, 2018, 12:28 PM EDT

In force

67 min

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

Minor

County Montgomery County, PA

The Philadelphia radar (KDIX), 93 km from the middle of the area, began a volume at 13:22 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.

Written for the forecast point Perkiomen Creek at Graterford (GRAP1). The gauge peaked at 10.55 ft at Aug 4, 2018, 10:00 AM EDT.

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.

922 
WGUS41 KPHI 041320
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
920 AM EDT Sat Aug 4 2018

...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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas. The water may be
deeper than you think.

&&

PAC091-041920-
/O.NEW.KPHI.FL.W.0027.180804T1521Z-180804T2234Z/
/GRAP1.1.ER.180804T1521Z.180804T1600Z.180804T1634Z.NO/
920 AM EDT Sat Aug 4 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Perkiomen Creek at Graterford.
* until this evening...Or until the warning is cancelled.
* At  9:02 AM Saturday the stage was 10.3 feet.
* Flood stage is 11.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage by late this morning and continue to rise to
  near 11.2 feet by this afternoon. The river will fall below flood stage by this
  afternoon.
* Impact...At 12.0 feet...Penitentiary Bridge is closed. Flooding begins in 
  Collegeville. Houses on the right bank in Graterford take on water.
* Flood history...This crest compares to a previous crest of 11.5 feet on Dec 28 
  1993.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Perkiomen Creek
  Graterford             11.0   10.28  Sat 9 AM    11.2    Sat 12 PM
 
&&
 
LAT...LON 4024 7549 4024 7542 4011 7542 4012 7547
                                      

$$

328 
WGUS81 KPHI 041628
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
1228 PM EDT Sat Aug 4 2018

...The Flood Warning is cancelled for the following rivers in Pennsylvania...

  Perkiomen Creek At Graterford affecting Montgomery County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas. The water may be
deeper than you think.

&&

PAC091-041658-
/O.CAN.KPHI.FL.W.0027.000000T0000Z-180804T2234Z/
/GRAP1.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
1228 PM EDT Sat Aug 4 2018

The Flood Warning is cancelled for
  The Perkiomen Creek at Graterford.
* At 12:01 PM Saturday the stage was 9.7 feet.
* Flood stage is 11.0 feet.
* Forecast...The river crested below flood stage at 10.6 feet. The river will 
  fall to 4.0 feet by .
* Impact...At 10.0 feet...The first evacuations begin in Schwenksville upstream 
  of the gage.
* Flood history...This crest compares to a previous crest of 9.7 feet on Mar 22 
  1999.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Perkiomen Creek
  Graterford             11.0    9.74  Sat 12 PM    9.0    Sat 2 PM 
 
&&
 
LAT...LON 4024 7549 4024 7542 4011 7542 4012 7547
                                      

$$

River Flood Warnings in Pennsylvania, 2018Every river flood warning in 2018

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.