Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 154, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 3, 2017, 8:29 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 46 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
- Aug 3, 2017, 8:29 PM EDT (00:29 UTC)
- Expired
- Aug 3, 2017, 9:15 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 00:28 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
Brookhaven, NY (KOKX), launched 00:00Z, 0.5 hours before the alert went out and 205 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
- 87 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 937 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
642
WUUS51 KPHI 040029
SVRPHI
PAC077-095-040115-
/O.NEW.KPHI.SV.W.0154.170804T0029Z-170804T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
829 PM EDT THU AUG 3 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Eastern Lehigh County in eastern Pennsylvania...
Northampton County in eastern Pennsylvania...
* Until 915 PM EDT
* At 828 PM EDT, a severe thunderstorm was located over Allentown,
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...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, Wilson,
Hellertown, Nazareth, Wind Gap, Bath, Walnutport, Belfast, West
Easton, Tatamy, Steuben, Glendon, Neffs, Coffeetown and Lehigh
University.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4078 7515 4075 7519 4073 7518 4068 7520
4068 7517 4065 7520 4064 7519 4046 7547
4063 7572 4081 7553 4083 7538 4086 7532
4086 7528
TIME...MOT...LOC 0028Z 223DEG 19KT 4058 7549
HAIL...1.00IN
WIND...60MPH
$$
CMS2 follow-up statements
084
WWUS51 KPHI 040057
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
857 PM EDT THU AUG 3 2017
PAC077-095-040115-
/O.CON.KPHI.SV.W.0154.000000T0000Z-170804T0115Z/
Lehigh PA-Northampton PA-
857 PM EDT THU AUG 3 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR EASTERN LEHIGH AND NORTHAMPTON COUNTIES...
At 857 PM EDT, a severe thunderstorm was located near Coffeetown, or
near Allentown, moving northeast at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect damage to
trees and power lines.
Locations impacted include...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, Wilson,
Hellertown, Nazareth, Wind Gap, Bath, Walnutport, Belfast, West
Easton, Tatamy, Steuben, Glendon, Neffs, Coffeetown and Lehigh
University.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4078 7515 4075 7519 4073 7518 4068 7520
4068 7517 4065 7520 4064 7519 4046 7547
4063 7572 4081 7553 4083 7538 4086 7532
4086 7528
TIME...MOT...LOC 0057Z 238DEG 10KT 4062 7553
HAIL...1.00IN
WIND...60MPH
$$
CMS412
WWUS51 KPHI 040111
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
911 PM EDT THU AUG 3 2017
PAC077-095-040121-
/O.EXP.KPHI.SV.W.0154.000000T0000Z-170804T0115Z/
Lehigh PA-Northampton PA-
911 PM EDT THU AUG 3 2017
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN LEHIGH AND NORTHAMPTON
COUNTIES WILL EXPIRE AT 915 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire. However gusty winds
and heavy rain are still possible with this thunderstorm.
LAT...LON 4078 7515 4075 7519 4073 7518 4068 7520
4068 7517 4065 7520 4064 7519 4046 7547
4063 7572 4081 7553 4083 7538 4086 7532
4086 7528
TIME...MOT...LOC 0111Z 223DEG 19KT 4067 7547
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 8:01 PM EDT | Special Weather Statement | PHI | Berks | 44 min |
| Aug 3, 8:11 PM EDT | Special Weather Statement | PHI | Lehigh | 49 min |
| Aug 3, 8:35 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh, Northampton | 4 hr |
| Aug 3, 8:54 PM EDT | Special Weather Statement | PHI | Berks | 51 min |
| Aug 3, 9:11 PM EDT | Areal Flood Warning | PHI | Bucks | 4 hr |
| Aug 3, 9:20 PM EDT | Areal Flood Advisory | PHI | Northampton | 3 hr |
| Aug 3, 9:29 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 46 min |
| Aug 4, 1:25 PM EDT | Special Weather Statement | PHI | Berks | 65 min |
| Aug 4, 2:49 PM EDT | Areal Flood Advisory | PHI | Berks | 116 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.