Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 43, NWS Philadelphia/Mount Holly

August 22, 2018Chester County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Aug 22, 2018, 10:04 AM EDT for Chester County, Montgomery County, Philadelphia County, Pennsylvania. It took effect at Aug 22, 2018, 10:20 AM EDT. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Aug 22, 2018, 10:04 AM EDT (14:04 UTC)
In effect from: Aug 22, 2018, 10:20 AM EDT
Expired: Aug 22, 2018, 2:59 PM EDT
In force: 5 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 14:05 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 13.12 ft at Aug 22, 2018, 12:00 PM 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.

969 
WGUS41 KPHI 221404
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
1004 AM EDT Wed Aug 22 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.

&&

PAC029-091-101-222003-
/O.NEW.KPHI.FL.W.0043.180822T1420Z-180823T0000Z/
/NRSP1.1.ER.180822T1420Z.180822T1600Z.180822T1800Z.NO/
1004 AM EDT Wed Aug 22 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Schuylkill River at Norristown.
* until this evening...Or until the warning is cancelled.
* At  9:30 AM Wednesday the stage was 12.9 feet.
* Flood stage is 13.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage by late this morning and continue to rise to
  near 13.1 feet by this afternoon. The river will fall below flood stage by this
  afternoon.
* Impact...At 13.0 feet...Water begins to cover and close Riverview Boulevard in
  West Norriton.
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Schuylkill River
  Norristown             13.0   12.95  Wed 9 AM    13.1    Wed 12 PM
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      

$$

1 follow-up statement

179 
WGUS81 KPHI 221859
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
259 PM EDT Wed Aug 22 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.

&&

PAC029-091-101-221929-
/O.CAN.KPHI.FL.W.0043.000000T0000Z-180823T0000Z/
/NRSP1.1.ER.180822T1350Z.180822T1600Z.180822T1703Z.NO/
259 PM EDT Wed Aug 22 2018

The Flood Warning is cancelled for
  The Schuylkill River at Norristown.
* At  2:30 PM Wednesday the stage was 12.7 feet.
* Flood stage is 13.0 feet.
* Fell below flood stage at 1:03 PM Wednesday.
* Forecast...The river will continue to fall to 10.6 feet by tomorrow morning.
* Impact...At 13.0 feet...Water begins to cover and close Riverview Boulevard in
  West Norriton.
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Schuylkill River
  Norristown             13.0   12.67  Wed 2 PM    Crested and Falling 
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 8:53 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	5 hr
Aug 21, 10:16 PM EDT	Flash Flood Warning	PHI	Berks, Chester, Montgomery	7 hr
Aug 21, 10:46 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Northampton	4 hr
Aug 21, 11:08 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Northampton	4 hr
Aug 21, 11:18 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Aug 21, 11:47 PM EDT	Areal Flood Advisory	PHI	Northampton	4 hr
Aug 22, 1:14 AM EDT	Areal Flood Advisory	PHI	Monroe	4 hr
Aug 22, 2:54 AM EDT	Areal Flood Warning	PHI	Bucks, Lehigh, Northampton	8 hr
Aug 22, 4:36 AM EDT	River Flood Warning	PHI	Montgomery	6 hr
Aug 22, 5:14 AM EDT	Areal Flood Warning	PHI	Berks, Chester, Montgomery	4 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.