Alert archive / Pennsylvania / Areal Flood Advisories in 2021
Areal Flood Advisory 201, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Nov 12, 2021, 7:34 AM EST for 5 counties in Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 12, 2021, 7:34 AM EST (12:34 UTC)
- Expired
- Nov 12, 2021, 10:00 AM EST
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 135 km from the middle of the area, began a volume at 12:35 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 nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 0.6 hours before the alert went out and 229 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 191 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 601 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 262 m²/s²
- 0-3 km storm-relative helicity
- 370 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted.
812
WGUS81 KPHI 121234
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
734 AM EST Fri Nov 12 2021
PAC011-025-077-089-095-121500-
/O.NEW.KPHI.FA.Y.0201.211112T1234Z-211112T1500Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Carbon PA-Lehigh PA-Monroe PA-Northampton PA-
734 AM EST Fri Nov 12 2021
...FLOOD ADVISORY IN EFFECT UNTIL 10 AM EST THIS MORNING...
* WHAT...Flooding caused by excessive rainfall is expected.
* WHERE...
Berks County in eastern Pennsylvania...
Lehigh County in eastern Pennsylvania...
Northampton County in eastern Pennsylvania...
Carbon County in northeastern Pennsylvania...
Monroe County in northeastern Pennsylvania...
* WHEN...Until 1000 AM EST.
* IMPACTS...Minor flooding in low-lying and poor drainage areas.
* ADDITIONAL DETAILS...
- At 732 AM EST, Doppler radar indicated locally heavy rain.
Rainfall totals as high as 1.0 to 1.5 inches are expected.
Minor flooding is ongoing or expected to begin shortly in the
advisory area. Drains blocked by leaves and other debris will
result in additional flooding of roadways and areas of
drainage.
- Some locations that may experience flooding include...
Allentown, Reading, Easton, Lehighton, Mount Pocono,
Bethlehem, Forks, Emmaus, Wyomissing, Northampton, East
Stroudsburg, and Tobyhanna.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4073 7576 4074 7576 4091 7600 4101 7573
4109 7577 4122 7554 4125 7513 4115 7516
4109 7497 4099 7513 4086 7505 4075 7520
4061 7520 4042 7548 4045 7553 4024 7570
4014 7587 4050 7644 4057 7602 4064 7599
$$
Iovino1 follow-up statement
881
WGUS81 KPHI 121402
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
902 AM EST Fri Nov 12 2021
PAC011-025-077-121412-
/O.CAN.KPHI.FA.Y.0201.000000T0000Z-211112T1500Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Carbon PA-Lehigh PA-
902 AM EST Fri Nov 12 2021
...FLOOD ADVISORY IS CANCELLED...
The Flood Advisory is cancelled for Berks, Lehigh, and Carbon
Counties.
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 4122 7554 4125 7513 4115 7516 4109 7497
4099 7513 4086 7505 4075 7520 4060 7521
4054 7533 4058 7540 4062 7538 4067 7543
4066 7548 4074 7553 4075 7560 4079 7561
4081 7547 4095 7557 4099 7550 4112 7565
$$
PAC089-095-121500-
/O.CON.KPHI.FA.Y.0201.000000T0000Z-211112T1500Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe PA-Northampton PA-
902 AM EST Fri Nov 12 2021
...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THIS MORNING...
* WHAT...Flooding caused by excessive rainfall continues.
* WHERE...
Northampton County in eastern Pennsylvania...
Monroe County in northeastern Pennsylvania...
* WHEN...Until 1000 AM EST.
* IMPACTS...Minor flooding in low-lying and poor drainage areas.
* ADDITIONAL DETAILS...
- At 900 AM EST, Doppler radar indicated locally heavy rain.
Rainfall totals as high as 1.0 to 1.5 inches are expected.
Minor flooding is ongoing or expected to begin shortly in the
advisory area. Drains blocked by leaves and other debris will
result in additional flooding of roadways and areas of
drainage.
- Some locations that may experience flooding include...
Easton, Mount Pocono, Bethlehem, Forks, Northampton, East
Stroudsburg, Tobyhanna, Wilson, Hellertown, Nazareth, Bangor,
and Slatington.
- http://www.weather.gov/safety/flood
LAT...LON 4122 7554 4125 7513 4115 7516 4109 7497
4099 7513 4086 7505 4075 7520 4060 7521
4054 7533 4058 7540 4062 7538 4067 7543
4066 7548 4074 7553 4075 7560 4079 7561
4081 7547 4095 7557 4099 7550 4112 7565
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 12, 6:40 AM EST | Special Weather Statement | PHI | Berks | 80 min |
| Nov 12, 9:16 AM EST | Special Weather Statement | PHI | Bucks | 44 min |
Nearby
Areal Flood Advisories in Pennsylvania, 2021Every areal flood advisory 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.