Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 178, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 21, 2017, 6:24 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 33 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 21, 2017, 6:24 PM EDT (22:24 UTC)
- Expired
- Aug 21, 2017, 6:57 PM EDT
- In force
- 33 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Berks County, PA, Lehigh County, PA
The radar
The Philadelphia radar (KDIX), 143 km from the middle of the area, began a volume at 22:27 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 21, 6:28 PM EDT | TSTM WND DMG | 1 N Lenhartsville, PA | TREES REPORTED DOWN IN WESTERN GREENWICH TOWNSHIP. |
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 12:00Z, 10.4 hours before the alert went out and 230 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
- 832 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 855 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
129
WUUS51 KPHI 212224
SVRPHI
PAC011-077-212315-
/O.NEW.KPHI.SV.W.0178.170821T2224Z-170821T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
624 PM EDT MON AUG 21 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern Berks County in eastern Pennsylvania...
Central Lehigh County in eastern Pennsylvania...
* Until 715 PM EDT
* At 624 PM EDT, a severe thunderstorm was located over
Lenhartsville, moving northeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect damage to
trees and power lines.
* Locations impacted include...
Allentown, Kutztown, Hamburg, Slatington, Shoemakersville,
Lenhartsville, Neffs, Wanamakers, Coffeetown, New Tripoli, Jordan
Valley, Emerald, Schnecksville, Claussville and Ancient Oaks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4057 7602 4064 7600 4069 7587 4070 7583
4077 7570 4078 7564 4057 7549 4045 7594
TIME...MOT...LOC 2224Z 243DEG 15KT 4057 7591
HAIL...1.00IN
WIND...60MPH
$$
Iovino2 follow-up statements
315
WWUS51 KPHI 212248
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
648 PM EDT MON AUG 21 2017
PAC011-212256-
/O.CAN.KPHI.SV.W.0178.000000T0000Z-170821T2315Z/
Berks PA-
648 PM EDT MON AUG 21 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BERKS COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning was moving out of
Berks County. Therefore, the warning has been cancelled.
LAT...LON 4069 7587 4070 7583 4077 7570 4078 7564
4057 7549 4053 7566 4068 7589
TIME...MOT...LOC 2246Z 243DEG 17KT 4062 7578
$$
PAC077-212315-
/O.CON.KPHI.SV.W.0178.000000T0000Z-170821T2315Z/
Lehigh PA-
648 PM EDT MON AUG 21 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR CENTRAL LEHIGH COUNTY...
At 646 PM EDT, a severe thunderstorm was located near Wanamakers,
moving northeast at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect damage to
trees and power lines.
Locations impacted include...
Slatington, Jordan Valley, Neffs, Wanamakers, Emerald,
Schnecksville, Coffeetown, New Tripoli and Claussville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4069 7587 4070 7583 4077 7570 4078 7564
4057 7549 4053 7566 4068 7589
TIME...MOT...LOC 2246Z 243DEG 17KT 4062 7578
HAIL...1.00IN
WIND...60MPH
$$
Iovino585
WWUS51 KPHI 212257
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
657 PM EDT MON AUG 21 2017
PAC077-212307-
/O.CAN.KPHI.SV.W.0178.000000T0000Z-170821T2315Z/
Lehigh PA-
657 PM EDT MON AUG 21 2017
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LEHIGH COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.
LAT...LON 4069 7587 4070 7583 4077 7570 4078 7564
4057 7549 4053 7566 4068 7589
TIME...MOT...LOC 2256Z 243DEG 15KT 4064 7573
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:14 PM EDT | Heat Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 29 hr |
| Aug 21, 5:44 PM EDT | Areal Flood Advisory | PHI | Berks | 4 hr |
| Aug 21, 6:20 PM EDT | Special Weather Statement | PHI | Lehigh | 55 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2017Every severe thunderstorm warning in 2017
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.