Alert archive / Pennsylvania / Areal Flood Advisories in 2021
Areal Flood Advisory 13, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jun 4, 2021, 1:29 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 4, 2021, 1:29 PM EDT (17:29 UTC)
- Expired
- Jun 4, 2021, 3:30 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Lehigh County, PA
The radar
The Philadelphia radar (KDIX), 150 km from the middle of the area, began a volume at 17:30 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 12:00Z, 5.5 hours before the alert went out and 217 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
- 381 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 947 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted.
654
WGUS81 KPHI 041729
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
129 PM EDT Fri Jun 4 2021
PAC011-077-041930-
/O.NEW.KPHI.FA.Y.0013.210604T1729Z-210604T1930Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Lehigh PA-
129 PM EDT Fri Jun 4 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
Northeastern Berks County in eastern Pennsylvania...
Central Lehigh County in eastern Pennsylvania...
* Until 330 PM EDT.
* At 129 PM EDT, Doppler radar and automated rain gauges indicated
heavy rain due to thunderstorms. Minor flooding is ongoing or
expected to begin shortly in the advisory area. Between 0.5 and 1
inch of rain has fallen. An additional 0.5 to 1 inch of rain is
possible.
* Flooding of low lying and poor drainage areas is expected.
* Some locations that will experience flooding include...
Kutztown, Hamburg, Topton, Shoemakersville, Lyons, Strausstown,
Lenhartsville, Claussville, Alburtis, and Centerport.
This includes the following highways...
Interstate 78 in Pennsylvania between mile markers 19 and 51.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4066 7562 4047 7560 4049 7621 4053 7619
4054 7617 4055 7613 4057 7608 4058 7607
4057 7605 4058 7604 4057 7602 4061 7600
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 8:44 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 30 min |
| Jun 4, 1:02 PM EDT | Special Weather Statement | PHI | Lehigh | 28 min |
| Jun 4, 1:07 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 38 min |
| Jun 4, 1:45 PM EDT | Areal Flood Advisory | PHI | Monroe, Northampton | 97 min |
| Jun 4, 1:49 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 41 min |
| Jun 4, 2:21 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 21 min |
| Jun 4, 2:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 51 min |
| Jun 4, 2:27 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 48 min |
| Jun 4, 3:14 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 46 min |
| Jun 4, 3:16 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 98 min |
| Jun 4, 3:18 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 42 min |
| Jun 4, 3:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 67 min |
| Jun 4, 3:46 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 44 min |
| Jun 4, 4:20 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 40 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.