Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 145, NWS Philadelphia/Mount Holly

August 2, 2017Lehigh County, Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 2, 2017, 3:04 PM EDT for Lehigh County, Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 41 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 2, 2017, 3:04 PM EDT (19:04 UTC)
Expired
Aug 2, 2017, 3:45 PM EDT
In force
41 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Warren County, NJ, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 113 km from the middle of the area, began a volume at 19:05 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 12:00Z, 7.1 hours before the alert went out and 210 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.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2017-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 823 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2017-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
823 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
1051 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

463 
WUUS51 KPHI 021904
SVRPHI
NJC041-PAC077-095-021945-
/O.NEW.KPHI.SV.W.0145.170802T1904Z-170802T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
304 PM EDT WED AUG 2 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Warren County in northwestern New Jersey...
  Northeastern Lehigh County in eastern Pennsylvania...
  Central Northampton County in eastern Pennsylvania...

* Until 345 PM EDT

* At 304 PM EDT, a severe thunderstorm was located over Steuben, or 7
  miles west of Easton, moving east at 25 mph.

  HAZARD...60 mph wind gusts and nickel size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Allentown, Easton, Bethlehem, Forks, Northampton, Wilson, Nazareth,
  Bath, Alpha, Belfast, West Easton, Tatamy, Steuben, Glendon, Lehigh
  University, Old Orchard, Phillipsburg, Catasauqua, Fountain Hill
  and Coplay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4058 7540 4070 7555 4082 7528 4066 7511
TIME...MOT...LOC 1904Z 258DEG 20KT 4069 7536 

HAIL...0.88IN
WIND...60MPH
 
$$
po
1 follow-up statement
144 
WWUS51 KPHI 021924
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
324 PM EDT WED AUG 2 2017

PAC077-021933-
/O.CAN.KPHI.SV.W.0145.000000T0000Z-170802T1945Z/
Lehigh PA-
324 PM EDT WED AUG 2 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LEHIGH COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. 

LAT...LON 4060 7533 4072 7545 4082 7528 4066 7511
TIME...MOT...LOC 1923Z 236DEG 8KT 4070 7532 

$$

NJC041-PAC095-021945-
/O.CON.KPHI.SV.W.0145.000000T0000Z-170802T1945Z/
Warren NJ-Northampton PA-
324 PM EDT WED AUG 2 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR SOUTHWESTERN WARREN AND CENTRAL NORTHAMPTON COUNTIES...

At 323 PM EDT, a severe thunderstorm was located over Nazareth, or
near Easton, moving northeast at 10 mph.

HAZARD...60 mph wind gusts and nickel size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Easton, Bethlehem, Forks, Wilson, Nazareth, Bath, Alpha, Belfast,
West Easton, Tatamy, Steuben, Glendon, Old Orchard, Phillipsburg,
Freemansburg, Stockertown, Eastlawn Gardens and Palmer Heights.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4060 7533 4072 7545 4082 7528 4066 7511
TIME...MOT...LOC 1923Z 236DEG 8KT 4070 7532 

HAIL...0.88IN
WIND...60MPH
 
$$

po

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 2, 12:09 PM EDTSpecial Weather StatementPHIPhiladelphia36 min
Aug 2, 12:11 PM EDTSpecial Weather StatementPHIMonroe34 min
Aug 2, 12:28 PM EDTAreal Flood AdvisoryPHIBucks, Chester, Delaware, Montgomery, Philadelphia4 hr
Aug 2, 12:39 PM EDTAreal Flood AdvisoryPHIMonroe4 hr
Aug 2, 12:45 PM EDTAreal Flood AdvisoryPHICarbon, Monroe4 hr
Aug 2, 12:52 PM EDTSpecial Weather StatementPHIMonroe23 min
Aug 2, 12:53 PM EDTSpecial Weather StatementPHICarbon37 min
Aug 2, 12:55 PM EDTSpecial Weather StatementPHIDelaware35 min
Aug 2, 1:08 PM EDTSpecial Weather StatementPHIPhiladelphia37 min
Aug 2, 1:26 PM EDTSpecial Weather StatementPHIDelaware34 min
Aug 2, 1:30 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia30 min
Aug 2, 1:36 PM EDTSpecial Weather StatementPHIBucks39 min
Aug 2, 1:48 PM EDTFlash Flood WarningPHIMontgomery4 hr
Aug 2, 1:49 PM EDTSpecial Weather StatementPHILehigh41 min
Aug 2, 1:50 PM EDTSpecial Weather StatementPHIPhiladelphia25 min
Aug 2, 2:01 PM EDTAreal Flood AdvisoryPHIBucks4 hr
Aug 2, 2:04 PM EDTSevere Thunderstorm WarningPHIBucks41 min
Aug 2, 2:09 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Montgomery51 min
Aug 2, 2:16 PM EDTAreal Flood AdvisoryPHIBerks4 hr
Aug 2, 2:27 PM EDTAreal Flood AdvisoryPHIBucks, Chester, Montgomery4 hr
Aug 2, 2:37 PM EDTSpecial Weather StatementPHIBerks38 min
Aug 2, 2:45 PM EDTAreal Flood AdvisoryPHIMonroe, Northampton4 hr
Aug 2, 2:48 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton27 min
Aug 2, 3:12 PM EDTSpecial Weather StatementPHIMontgomery48 min
Aug 2, 3:34 PM EDTSpecial Weather StatementPHIChester26 min
Aug 2, 4:09 PM EDTAreal Flood AdvisoryPHIMonroe4 hr
Aug 2, 4:23 PM EDTSpecial Weather StatementPHIMonroe37 min
Aug 2, 4:27 PM EDTAreal Flood AdvisoryPHIDelaware, Philadelphia4 hr
Aug 2, 4:40 PM EDTSpecial Weather StatementPHIPhiladelphia50 min
Aug 2, 12:31 PM EDTSpecial Weather StatementPHIMorris29 min
Aug 2, 12:37 PM EDTSpecial Weather StatementPHIMercer38 min
Aug 2, 12:43 PM EDTAreal Flood AdvisoryPHIMiddlesex4 hr
Aug 2, 1:00 PM EDTSpecial Weather StatementPHIMorris30 min
Aug 2, 1:02 PM EDTAreal Flood AdvisoryPHIMorris5 hr
Aug 2, 1:32 PM EDTSpecial Weather StatementPHIMorris28 min
Aug 2, 2:09 PM EDTSpecial Weather StatementPHICamden51 min
Aug 2, 2:10 PM EDTFlash Flood WarningPHIMorris4 hr
Aug 2, 2:18 PM EDTSpecial Weather StatementPHIWarren42 min
Aug 2, 2:26 PM EDTSpecial Weather StatementPHIBurlington49 min
Aug 2, 2:35 PM EDTSpecial Weather StatementPHIBurlington40 min
Aug 2, 2:42 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset4 hr
Aug 2, 2:46 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean44 min
Aug 2, 2:55 PM EDTAreal Flood AdvisoryPHIBurlington, Monmouth, Ocean5 hr
Aug 2, 3:06 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Sussex, Warren4 hr
Aug 2, 3:16 PM EDTSpecial Weather StatementPHIBurlington29 min
Aug 2, 3:20 PM EDTAreal Flood AdvisoryPHIBurlington, Ocean4 hr
Aug 2, 3:32 PM EDTSpecial Weather StatementPHIWarren43 min
Aug 2, 3:33 PM EDTSpecial Weather StatementPHIMonmouth42 min
Aug 2, 3:36 PM EDTSpecial Weather StatementPHIUnion39 min
Aug 2, 3:39 PM EDTSpecial Weather StatementPHIMiddlesex51 min
Aug 2, 3:50 PM EDTSpecial Weather StatementPHISussex25 min
Aug 2, 3:58 PM EDTAreal Flood AdvisoryPHIBurlington, Mercer, Middlesex, Monmouth, Morris, Somerset4 hr
Aug 2, 4:06 PM EDTSpecial Weather StatementPHIGloucester, Salem39 min
Aug 2, 4:15 PM EDTSpecial Marine WarningPHI60 min
Aug 2, 4:29 PM EDTSpecial Weather StatementPHICumberland46 min
Aug 2, 4:39 PM EDTSpecial Weather StatementPHISomerset36 min
Aug 2, 4:48 PM EDTSpecial Weather StatementPHICamden42 min
Aug 2, 5:11 PM EDTSpecial Weather StatementPHICumberland34 min
Aug 2, 5:15 PM EDTSpecial Marine WarningPHI60 min
Aug 2, 5:21 PM EDTSevere Thunderstorm WarningPHIAtlantic, Camden, Cumberland, Gloucester39 min
Aug 2, 5:23 PM EDTSpecial Weather StatementPHIGloucester37 min
Aug 2, 5:28 PM EDTAreal Flood AdvisoryPHIAtlantic, Camden, Cumberland, Gloucester, Salem4 hr
Aug 2, 5:46 PM EDTAreal Flood AdvisoryPHIMorris59 min
Aug 2, 6:02 PM EDTSpecial Marine WarningPHI58 min
Aug 2, 6:11 PM EDTSpecial Marine WarningPHI64 min
Aug 2, 6:52 PM EDTSpecial Marine WarningPHI53 min
Aug 2, 6:52 PM EDTSpecial Weather StatementPHICape May38 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017Severe Thunderstorm Warnings in New Jersey, 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.