Alert archive / Pennsylvania / Areal Flood Advisories in 2021
Areal Flood Advisory 162, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 28, 2021, 2:47 AM EDT for Berks County, Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2021, 2:47 AM EDT (06:47 UTC)
- Expired
- Aug 28, 2021, 5:00 AM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Berks County, PA
The radar
The Philadelphia radar (KDIX), 151 km from the middle of the area, began a volume at 06:48 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 6.8 hours before the alert went out and 205 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
- 711 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1370 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
232
WGUS81 KPHI 280647
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
247 AM EDT Sat Aug 28 2021
PAC011-280900-
/O.NEW.KPHI.FA.Y.0162.210828T0647Z-210828T0900Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
247 AM EDT Sat Aug 28 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
Berks County in eastern Pennsylvania...
* Until 500 AM EDT.
* At 247 AM EDT, Doppler radar indicated heavy rain due to
thunderstorms. Between 0.5 and 1 inch of rain has fallen. Combined
with the heavy rainfall much of this area received last evening,
these storms will likely produce areas of poor-drainage and urban
flooding.
* Some locations that may experience flooding include...
Reading, Wyomissing, Birdsboro, Hamburg, Fleetwood, Sinking
Spring, Laureldale, Womelsdorf, Wernersville, Robesonia, Leesport,
and Shoemakersville.
This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 300.
Interstate 78 in Pennsylvania between mile markers 10 and 35.
Interstate 176 in Pennsylvania between mile markers 1 and 11.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4065 7596 4025 7569 4014 7587 4036 7621
4037 7623 4050 7644 4054 7617 4058 7604
4057 7602 4064 7599
$$
CMS2 follow-up statements
674
WGUS81 KPHI 280745
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
345 AM EDT Sat Aug 28 2021
PAC011-280900-
/O.CON.KPHI.FA.Y.0162.000000T0000Z-210828T0900Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
345 AM EDT Sat Aug 28 2021
...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 5 AM EDT EARLY THIS
MORNING FOR SOUTHERN BERKS COUNTY...
At 345 AM EDT, local law enforcement reported heavy rain in the
advisory area due to thunderstorms. Minor flooding is already
occurring in Spring Township. Between 1 and 2 inches of rain have
fallen.
Some locations that may experience flooding include...
Reading, Wyomissing, Birdsboro, Fleetwood, Sinking Spring,
Laureldale, Womelsdorf, Wernersville, Robesonia, Leesport,
Shoemakersville, and Bernville.
This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 299.
Interstate 176 in Pennsylvania between mile markers 1 and 11.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4052 7587 4025 7569 4022 7575 4021 7576
4019 7579 4018 7581 4014 7587 4034 7619
4036 7621 4036 7622 4037 7623 4050 7600
$$
CMS643
WGUS81 KPHI 280853
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
453 AM EDT Sat Aug 28 2021
PAC011-280903-
/O.EXP.KPHI.FA.Y.0162.000000T0000Z-210828T0900Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
453 AM EDT Sat Aug 28 2021
...FLOOD ADVISORY WILL EXPIRE AT 5 AM EDT EARLY THIS MORNING FOR
SOUTHERN BERKS COUNTY...
The threat for widespread flooding has increased over the area.
Therefore the Flood Advisory has been replaced by a Flash Flood
Warning. Please refer to that bulletin for more information.
LAT...LON 4052 7587 4025 7569 4022 7575 4021 7576
4019 7579 4018 7581 4014 7587 4034 7619
4036 7621 4036 7622 4037 7623 4050 7600
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 3:06 AM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 28, 4:06 AM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 28, 8:07 AM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Northampton | 3 hr |
| Aug 28, 9:06 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Northampton | 3 hr |
| Aug 28, 11:57 AM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 3 hr |
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.