Alert archive / Pennsylvania / River Flood Warnings in 2021

River Flood Warning 57, NWS Philadelphia/Mount Holly

September 1, 2021Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Sep 1, 2021, 8:29 PM EDT for Lehigh County, Pennsylvania. It took effect at Sep 1, 2021, 9:39 PM EDT. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Sep 1, 2021, 8:29 PM EDT (00:29 UTC)
In effect from
Sep 1, 2021, 9:39 PM EDT
Expired
Sep 2, 2021, 6:38 AM EDT
In force
9 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
Minor

County Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 00:28 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 Little Lehigh Creek at Allentown (APAP1). The gauge peaked at 9.57 ft at Sep 2, 2021, 12:00 AM EDT.

actionminormoderate51009/0109/0209/03
Action stage
6 ft
Minor stage
8 ft
Moderate stage
10 ft
Major stage
12 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01451650, 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.

544 
WGUS41 KPHI 020029
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
829 PM EDT Wed Sep 1 2021

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

  Little Lehigh At Allentown 10th St Bridge affecting Lehigh County.

For the Little Lehigh...including Allentown 10th St Bridge...Minor 
flooding is forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Additional information is available at www.weather.gov/phi.


PAC077-020915-
/O.NEW.KPHI.FL.W.0057.210902T0139Z-210902T0903Z/
/APAP1.1.ER.210902T0139Z.210902T0200Z.210902T0302Z.NO/
829 PM EDT Wed Sep 1 2021

The National Weather Service in Mount Holly has issued a

* Flood Warning for
  the Little Lehigh At Allentown 10th St Bridge.
* Until late tonight.
* At 8:17 PM EDT Wednesday the stage was 6.3 feet.
* Flood stage is 8.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  this evening to a crest of 8.2 feet late this evening. It will 
  then fall below flood stage tonight.
* Impact...At 6.0 feet, Fountain Park begins to flood.
* Impact...At 7.0 feet, The Fountain Park pathway floods.
* Impact...At 8.0 feet, Martin Luther King Jr. Drive begins to flood 
  near Lehigh Street.
* Impact...At 9.0 feet, Fish Hatchery Road is flooded.
* Flood History...This crest compares to a previous crest of 8.1 
  feet on 09/16/1999.

&&


  Fld   Observed           Forecasts (8 pm EDT)
Location                Stg   Stg   Day/Time     Thu   Fri   Sat

Little Lehigh
Allentown 10th St Bridg 8.0   6.3   Wed 8 pm EDT 3.3   MSG   MSG





&&

LAT...LON 4061 7548 4059 7543 4054 7547 4056 7552

$$

NC
2 follow-up statements
597 
WGUS81 KPHI 020324
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1124 PM EDT Wed Sep 1 2021

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

  Little Lehigh At Allentown 10th St Bridge affecting Lehigh County.

For the Little Lehigh...including Allentown 10th St Bridge...Minor 
flooding is forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Additional information is available at www.weather.gov/phi.


PAC077-021045-
/O.EXT.KPHI.FL.W.0057.000000T0000Z-210902T1043Z/
/APAP1.1.ER.210902T0147Z.210902T0400Z.210902T0443Z.NO/
1124 PM EDT Wed Sep 1 2021

...The Flood Warning is now in effect until tomorrow morning...

The Flood Warning continues for
  the Little Lehigh At Allentown 10th St Bridge.
* Until Thursday morning.
* At 10:45 PM EDT Wednesday the stage was 9.2 feet.
* Flood stage is 8.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 10:45 PM EDT Wednesday was 9.2 feet.
* Forecast...The river will fall below flood stage just after 
  midnight tonight to 3.1 feet and then begin rising early Friday 
  morning. It will then rise again to 3.2 feet Friday morning. It 
  will fall to 3.0 feet and then begin rising late Friday morning 
  then rise again.
* Impact...At 6.0 feet, Fountain Park begins to flood.
* Impact...At 7.0 feet, The Fountain Park pathway floods.
* Impact...At 8.0 feet, Martin Luther King Jr. Drive begins to flood 
  near Lehigh Street.
* Impact...At 9.0 feet, Fish Hatchery Road is flooded.
* Impact...At 10.0 feet, Water is several feet deep on Martin Luther 
  King Jr. Drive near Lehigh Street. Businesses are flooded.
* Flood History...This crest compares to a previous crest of 9.9 
  feet on 08/28/2011.

&&


  Fld   Observed           Forecasts (11 pm EDT)
Location                Stg   Stg   Day/Time     Thu   Fri   Sat

Little Lehigh
Allentown 10th St Bridg 8.0   9.2   Wed 10 pm ED 3.1   MSG   MSG





&&

LAT...LON 4061 7548 4059 7543 4054 7547 4056 7552

$$

Meola
683 
WGUS81 KPHI 021038
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
638 AM EDT Thu Sep 2 2021

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

  Little Lehigh At Allentown 10th St Bridge affecting Lehigh County.

PAC077-021145-
/O.CAN.KPHI.FL.W.0057.000000T0000Z-210902T1038Z/
/APAP1.1.ER.210902T0147Z.210902T0330Z.210902T0656Z.NO/
638 AM EDT Thu Sep 2 2021

...The Flood Warning for the Little Lehigh At Allentown 10th St 
Bridge has been cancelled...

The Flood Warning is cancelled for
  the Little Lehigh At Allentown 10th St Bridge.
* At 5:45 AM EDT Thursday the stage was 6.9 feet.
* Flood stage is 8.0 feet.
* Forecast...The river will oscillate this morning before falling 
  this afternoon. Additional flood warnings are in place for the 
  region.

&&


  Fld   Observed           Forecasts (7 am EDT)
Location                Stg   Stg   Day/Time     Fri   Sat   Sun

Little Lehigh
Allentown 10th St Bridg 8.0   6.9   Thu 5 am EDT 3.1   MSG   MSG





&&

LAT...LON 4061 7548 4059 7543 4054 7547 4056 7552

$$

Kruzdlo

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 9:47 PM EDTRiver Flood WarningPHIBerks18 hr
Sep 1, 10:24 PM EDTFlash Flood WarningPHIBucks, Philadelphia4 hr
Sep 1, 10:29 PM EDTRiver Flood WarningPHIBucks49 hr
Sep 1, 10:32 PM EDTRiver Flood WarningPHIBucks31 hr
Sep 1, 10:42 PM EDTAreal Flood WarningPHIBerks, Bucks, Montgomery12 hr
Sep 1, 10:47 PM EDTAreal Flood WarningPHIBucks, Carbon, Lehigh, Northampton23 hr
Sep 1, 10:52 PM EDTAreal Flood WarningPHIBucks12 hr
Sep 1, 11:38 PM EDTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery10 hr
Sep 2, 12:01 AM EDTAreal Flood WarningPHIMonroe, Northampton40 hr
Sep 2, 2:23 AM EDTAreal Flood WarningPHIBucks, Delaware, Montgomery, Philadelphia9 hr
Sep 2, 2:29 AM EDTAreal Flood WarningPHIBucks, Philadelphia5 hr
Sep 2, 2:41 AM EDTAreal Flood WarningPHIBucks14 hr
Sep 2, 3:52 AM EDTAreal Flood WarningPHIBucks8 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIBucks37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHINorthampton37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIBucks37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIBucks33 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIBucks34 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIMonroe, Northampton5 hr
Sep 2, 5:02 AM EDTRiver Flood WarningPHILehigh11 hr
Sep 2, 6:05 AM EDTCoastal Flood WarningPHIBucks, Delaware, Montgomery, Philadelphia6 hr
Sep 2, 6:44 PM EDTCoastal Flood AdvisoryPHIBucks, Delaware, Philadelphia7 hr

Nearby

River Flood Warnings in Pennsylvania, 2021Every river flood warning in 2021

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.