Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 259, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2021, 10:27 PM EDT for Berks County, Carbon County, Pennsylvania. It was in force for 48 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 12, 2021, 10:27 PM EDT (02:27 UTC)
- Expired
- Aug 12, 2021, 11:15 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Berks County, PA, Carbon County, PA
The radar
The Philadelphia radar (KDIX), 160 km from the middle of the area, began a volume at 02:28 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 12, 10:50 PM EDT | TSTM WND DMG | 1 Ssw Shartlesville, PA | TREE DOWN BLOCKING WOLF CREEK ROAD. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 2.5 hours before the alert went out and 214 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
- 2808 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1565 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.9
The text
As transmitted.
678
WUUS51 KPHI 130227
SVRPHI
PAC011-025-130315-
/O.NEW.KPHI.SV.W.0259.210813T0227Z-210813T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1027 PM EDT Thu Aug 12 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern Berks County in eastern Pennsylvania...
Southwestern Carbon County in northeastern Pennsylvania...
* Until 1115 PM EDT.
* At 1026 PM EDT, severe thunderstorms were located along a line
extending from near Numidia to near Palmyra, moving northeast at 45
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Hamburg, Womelsdorf, Weatherly, Wernersville, Robesonia, Bernville,
Strausstown, Lansford, Beaver Meadows, Centerport and Tresckow.
This includes Interstate 78 in Pennsylvania near mile marker 8, and
between mile markers 10 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4052 7634 4052 7625 4056 7609 4058 7606
4058 7604 4057 7602 4063 7600 4066 7595
4080 7590 4091 7599 4098 7582 4033 7607
4032 7617 4049 7643
TIME...MOT...LOC 0226Z 240DEG 38KT 4089 7632 4034 7658
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Fitzsimmons1 follow-up statement
065
WWUS51 KPHI 130258
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1058 PM EDT Thu Aug 12 2021
PAC011-025-130315-
/O.CON.KPHI.SV.W.0259.000000T0000Z-210813T0315Z/
Berks PA-Carbon PA-
1058 PM EDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR NORTHWESTERN BERKS AND SOUTHWESTERN CARBON COUNTIES...
At 1058 PM EDT, severe thunderstorms were located along a line
extending from near Hazleton to near Strausstown, moving east at 40
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Hamburg, Weatherly, Bernville, Strausstown, Lansford, Beaver Meadows
and Tresckow.
This includes Interstate 78 in Pennsylvania near mile marker 8, and
between mile markers 10 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4042 7604 4045 7636 4045 7637 4049 7643
4052 7634 4052 7625 4056 7609 4058 7606
4058 7604 4057 7602 4063 7600 4066 7595
4080 7590 4091 7599 4098 7582
TIME...MOT...LOC 0258Z 250DEG 35KT 4098 7596 4043 7622
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 11:20 PM EDT | Special Weather Statement | PHI | Carbon, Lehigh, Northampton | 40 min |
| Aug 12, 11:49 PM EDT | Special Weather Statement | PHI | Northampton | 56 min |
| Aug 13, 5:31 PM EDT | Special Weather Statement | PHI | Chester | 44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.