Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 73, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 9, 2021, 5:27 PM EDT for Berks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 9, 2021, 5:27 PM EDT (21:27 UTC)
- Expired
- Jun 9, 2021, 5:50 PM EDT
- In force
- 23 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Berks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 144 km from the middle of the area, began a volume at 21:28 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.5 hours before the alert went out and 227 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
- 193 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 1225 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -75 m²/s²
- 0-3 km storm-relative helicity
- 3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
446
WUUS51 KPHI 092127
SVRPHI
PAC011-077-095-092215-
/O.NEW.KPHI.SV.W.0073.210609T2127Z-210609T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
527 PM EDT Wed Jun 9 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern Berks County in eastern Pennsylvania...
Lehigh County in eastern Pennsylvania...
Southwestern Northampton County in eastern Pennsylvania...
* Until 615 PM EDT.
* At 527 PM EDT, a severe thunderstorm was located over Hamburg, or
12 miles east of Schuylkill Haven, moving northwest at 15 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Allentown, Bethlehem, Emmaus, Northampton, Hellertown, Kutztown,
Hamburg, Slatington, Fleetwood, Walnutport, Topton, Leesport,
Shoemakersville, Lyons, Lenhartsville, Neffs, Coffeetown, New
Tripoli, Berlinsville and Ancient Oaks.
This includes the following highways...
Northeast Extension between mile markers 51 and 71.
Interstate 78 in Pennsylvania between mile markers 22 and 71.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4056 7609 4058 7606 4057 7602 4065 7598
4070 7583 4078 7567 4078 7562 4080 7556
4062 7526 4037 7578 4046 7611 4053 7619
TIME...MOT...LOC 2127Z 144DEG 12KT 4057 7595
HAIL...0.75IN
WIND...60MPH
$$
Davis1 follow-up statement
006
WWUS51 KPHI 092150
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
550 PM EDT Wed Jun 9 2021
PAC011-077-095-092159-
/O.CAN.KPHI.SV.W.0073.000000T0000Z-210609T2215Z/
Berks PA-Lehigh PA-Northampton PA-
550 PM EDT Wed Jun 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BERKS...LEHIGH
AND SOUTHWESTERN NORTHAMPTON COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled. However, small hail and gusty winds are still
possible with this thunderstorm.
LAT...LON 4056 7609 4058 7606 4057 7602 4065 7598
4070 7583 4078 7567 4078 7562 4080 7556
4062 7526 4037 7578 4046 7611 4053 7619
TIME...MOT...LOC 2147Z 144DEG 12KT 4063 7601
$$
DavisThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 3:49 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Jun 9, 4:54 PM EDT | Flash Flood Warning | PHI | Berks, Montgomery | 112 min |
| Jun 9, 5:32 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 28 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2021Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.