Alert archive / Pennsylvania / Areal Flood Advisories in 2021
Areal Flood Advisory 39, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jun 20, 2021, 10:04 PM EDT for Berks County, Pennsylvania. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2021, 10:04 PM EDT (02:04 UTC)
- Expired
- Jun 20, 2021, 11:30 PM EDT
- In force
- 86 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Berks County, PA
The radar
The State College radar (KCCX), 149 km from the middle of the area, began a volume at 02:08 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, 2.1 hours before the alert went out and 195 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
- 662 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1494 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
520
WGUS81 KPHI 210204
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
1004 PM EDT Sun Jun 20 2021
PAC011-210330-
/O.NEW.KPHI.FA.Y.0039.210621T0204Z-210621T0330Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
1004 PM EDT Sun Jun 20 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
West Central Berks County in eastern Pennsylvania...
* Until 1130 PM EDT.
* At 1004 PM EDT, Doppler radar indicated heavy rain due to
thunderstorms. Minor flooding is ongoing or expected to begin
shortly in the advisory area. Between 1 and 2.5 inches of rain
have fallen.
* Some locations that will experience flooding include...
mainly rural areas of West Central Berks County
This includes the following highways...
Interstate 78 in Pennsylvania between mile markers 10 and 16.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4052 7628 4047 7622 4043 7634 4050 7644
4050 7642 4052 7634
$$
CMS2 follow-up statements
715
WGUS81 KPHI 210246
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
1046 PM EDT Sun Jun 20 2021
PAC011-210330-
/O.CON.KPHI.FA.Y.0039.000000T0000Z-210621T0330Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
1046 PM EDT Sun Jun 20 2021
...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1130 PM EDT THIS EVENING
FOR WEST CENTRAL BERKS COUNTY...
At 1046 PM EDT, Doppler radar indicated the heavy rainfall had moved
northeast of the advisory area. However, runoff will likely continue
to cause minor flooding in the advisory area. Between 1 and 2.5
inches of rain have fallen.
Some locations that will experience flooding include...
mainly rural areas of West Central Berks County
This includes the following highways...
Interstate 78 in Pennsylvania between mile markers 10 and 16.
LAT...LON 4052 7628 4047 7622 4043 7634 4050 7644
4050 7642 4052 7634
$$
CMS973
WGUS81 KPHI 210325
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
1125 PM EDT Sun Jun 20 2021
PAC011-210335-
/O.EXP.KPHI.FA.Y.0039.000000T0000Z-210621T0330Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
1125 PM EDT Sun Jun 20 2021
...FLOOD ADVISORY WILL EXPIRE AT 1130 PM EDT THIS EVENING FOR WEST
CENTRAL BERKS COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4052 7628 4047 7622 4043 7634 4050 7644
4050 7642 4052 7634
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 9:27 PM EDT | Special Weather Statement | PHI | Schuylkill | 33 min |
| Jun 20, 9:55 PM EDT | Special Weather Statement | PHI | Lebanon | 35 min |
| Jun 20, 10:27 PM EDT | Special Weather Statement | PHI | Berks | 33 min |
| Jun 21, 4:35 AM EDT | Heat Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 15 hr |
| Jun 21, 6:08 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 52 min |
| Jun 21, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 54 min |
| Jun 21, 7:02 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 43 min |
| Jun 21, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 48 min |
| Jun 21, 7:38 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 52 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.