Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 48, NWS Philadelphia/Mount Holly

September 28, 2018Chester County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Sep 28, 2018, 8:33 AM EDT for Chester County, Montgomery County, Philadelphia County, Pennsylvania. It took effect at Sep 28, 2018, 12:03 PM EDT. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Sep 28, 2018, 8:33 AM EDT (12:33 UTC)
In effect from: Sep 28, 2018, 12:03 PM EDT
Expired: Sep 28, 2018, 3:18 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: Minor

Counties Chester County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 78 km from the middle of the area, began a volume at 12:36 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 Schuylkill River at Norristown (NRSP1). The gauge peaked at 13.39 ft at Sep 28, 2018, 11:00 AM EDT.

Action stage: 12 ft
Minor stage: 13 ft
Moderate stage: 17 ft
Major stage: 19 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01473500, 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.

518 
WGUS41 KPHI 281233
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
833 AM EDT Fri Sep 28 2018

...The National Weather Service in Mount Holly NJ has issued a
flood warning for the following rivers in Pennsylvania...

  Schuylkill River At Norristown affecting Chester...Montgomery 
  and Philadelphia Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC029-091-101-281833-
/O.NEW.KPHI.FL.W.0048.180928T1603Z-180929T0700Z/
/NRSP1.1.ER.180928T1603Z.180928T1800Z.180929T0100Z.NO/
833 AM EDT Fri Sep 28 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Schuylkill River at Norristown.
* From this afternoon to late tonight...or until the warning is 
  cancelled.
* At 7:30 AM Friday the stage was 11.8 feet.
* Flood stage is 13.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage this morning and continue to 
  rise to near 13.5 feet this afternoon. The river will fall below 
  flood stage this evening.
* Impact...At 13.0 feet...Water begins to cover and close Riverview 
  Boulevard in West Norriton.
* Flood history...This crest compares to a previous crest of 13.7 
  feet on Aug 4 2018.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG    DAY TIME    CREST

Schuylkill River
  Norristown             13.0   11.83  Fri 7 AM    13.5    Fri 2 PM 
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      

$$

Kruzdlo

2 follow-up statements

568 
WGUS81 KPHI 281747
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
147 PM EDT Fri Sep 28 2018

...The Flood Warning continues for the following rivers in
Pennsylvania...

  Schuylkill River At Norristown affecting Chester...Montgomery
  and Philadelphia Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC029-091-101-290100-
/O.EXT.KPHI.FL.W.0048.000000T0000Z-180929T0100Z/
/NRSP1.1.ER.180928T1313Z.180928T1515Z.180928T1900Z.NO/
147 PM EDT Fri Sep 28 2018

The Flood Warning continues for
  The Schuylkill River at Norristown.
* At 12:30 PM Friday the stage was 13.3 feet.
* Flood stage is 13.0 feet.
* Minor flooding is occurring.
* Forecast...The river will fall below flood stage late this 
  afternoon.
* Impact...At 13.0 feet...Water begins to cover and close 
  Riverview Boulevard in West Norriton.
* Flood history...This crest compares to a previous crest of 13.7
  feet on Aug 4 2018.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG    DAY TIME    CREST

Schuylkill River
  Norristown             13.0   13.27  Fri 12 PM   Crested and falling 
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      

$$

Kruzdlo

046 
WGUS81 KPHI 281918
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
318 PM EDT Fri Sep 28 2018

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

  Schuylkill River At Norristown affecting Chester...Montgomery 
  and Philadelphia Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC029-091-101-281948-
/O.CAN.KPHI.FL.W.0048.000000T0000Z-180929T0100Z/
/NRSP1.1.ER.180928T1313Z.180928T1515Z.180928T1815Z.NO/
318 PM EDT Fri Sep 28 2018

The Flood Warning is cancelled for
  The Schuylkill River at Norristown.
* At 2:30 PM Friday the stage was 12.96 feet.
* Flood stage is 13.0 feet.
* Fell below flood stage at 2:15 PM Friday.
* Forecast...The river will continue to fall to 10.6 feet by 
  tomorrow morning.
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG    DAY TIME    CREST

Schuylkill River
  Norristown             13.0   12.96  Fri 2 PM    Crested and falling 
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 12:10 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	13 hr
Sep 28, 1:44 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	5 hr
Sep 28, 3:13 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Sep 28, 4:59 AM EDT	River Flood Warning	PHI	Chester	7 hr
Sep 28, 5:33 AM EDT	River Flood Warning	PHI	Montgomery	6 hr
Sep 28, 7:33 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	5 hr
Sep 28, 8:28 AM EDT	River Flood Warning	PHI	Chester, Delaware	13 hr
Sep 28, 12:31 PM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	2 hr

Nearby

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

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.