Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 68, NWS Philadelphia/Mount Holly

August 4, 2018Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 4, 2018, 4:41 PM EDT for Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 34 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 4, 2018, 4:41 PM EDT (20:41 UTC)
Expired
Aug 4, 2018, 5:15 PM EDT
In force
34 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 20:41 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, 8.7 hours before the alert went out and 199 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 2018-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1326 joules per kilogram.LCLEL10008507005003002001001 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 2018-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 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
1326 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
507 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
170 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.6

Open this sounding in Storm Lab

The text

As transmitted.

916 
WUUS51 KPHI 042041
SVRPHI
NJC041-PAC095-042115-
/O.NEW.KPHI.SV.W.0068.180804T2041Z-180804T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
441 PM EDT SAT AUG 4 2018

The National Weather Service in Mount Holly NJ has issued a

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

* Until 515 PM EDT.

* At 440 PM EDT, a severe thunderstorm was located over Nazareth, or
  near Easton, moving east at 15 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Easton, Bethlehem, Forks, Wilson, Nazareth, Bath, Harmony, Alpha,
  Belfast, West Easton, Tatamy, Riegelsville, Steuben, Glendon, Old
  Orchard, Brass Castle, Phillipsburg, Freemansburg, Stockertown and
  Chapman.

People attending Warren County Farmers Fair should seek safe shelter
immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4075 7502 4061 7519 4057 7529 4067 7543
      4082 7538
TIME...MOT...LOC 2040Z 289DEG 12KT 4071 7533 

HAIL...1.00IN
WIND...60MPH
 
$$

Iovino
1 follow-up statement
286 
WWUS51 KPHI 042058
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
458 PM EDT SAT AUG 4 2018

NJC041-PAC095-042115-
/O.CON.KPHI.SV.W.0068.000000T0000Z-180804T2115Z/
Warren NJ-Northampton PA-
458 PM EDT SAT AUG 4 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHWESTERN WARREN AND SOUTHEASTERN NORTHAMPTON COUNTIES...

At 457 PM EDT, a severe thunderstorm was centered over Easton, 
moving southeast at 15 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Easton, Bethlehem, Forks, Wilson, Nazareth, Harmony, Alpha, Belfast,
West Easton, Tatamy, Riegelsville, 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 4061 7519 4057 7529 4066 7542 4080 7528
      4073 7504
TIME...MOT...LOC 2057Z 305DEG 15KT 4066 7526 

HAIL...1.00IN
WIND...60MPH
 
$$

Iovino

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 8:35 PM EDTAreal Flood AdvisoryPHICarbon4 hr
Aug 3, 9:03 PM EDTFlash Flood WarningPHIBerks8 hr
Aug 3, 9:10 PM EDTAreal Flood AdvisoryPHIMonroe, Northampton4 hr
Aug 3, 10:07 PM EDTSpecial Weather StatementPHILehigh, Northampton53 min
Aug 3, 10:23 PM EDTFlash Flood WarningPHILehigh, Northampton4 hr
Aug 3, 11:24 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh6 hr
Aug 4, 12:24 AM EDTAreal Flood AdvisoryPHICarbon4 hr
Aug 4, 1:08 AM EDTAreal Flood AdvisoryPHIMonroe4 hr
Aug 4, 1:15 AM EDTSpecial Weather StatementPHIBerks30 min
Aug 4, 1:47 AM EDTSpecial Weather StatementPHIBerks, Lehigh43 min
Aug 4, 1:59 AM EDTAreal Flood AdvisoryPHIChester4 hr
Aug 4, 2:22 AM EDTAreal Flood WarningPHILehigh, Northampton21 hr
Aug 4, 2:27 AM EDTSpecial Weather StatementPHILehigh, Northampton63 min
Aug 4, 4:54 AM EDTAreal Flood WarningPHIBerks7 hr
Aug 4, 5:09 AM EDTAreal Flood AdvisoryPHIMonroe2 hr
Aug 4, 5:45 AM EDTAreal Flood AdvisoryPHIBucks, Chester, Montgomery7 hr
Aug 4, 6:45 AM EDTRiver Flood WarningPHIChester4 hr
Aug 4, 6:55 AM EDTAreal Flood AdvisoryPHIBucks, Montgomery4 hr
Aug 4, 8:48 AM EDTAreal Flood WarningPHIChester, Montgomery4 hr
Aug 4, 9:20 AM EDTRiver Flood WarningPHIMontgomery3 hr
Aug 4, 11:55 AM EDTRiver Flood WarningPHIChester, Montgomery, Philadelphia12 hr
Aug 3, 10:35 PM EDTSpecial Weather StatementPHIMorris, Sussex, Warren55 min
Aug 4, 2:53 AM EDTAreal Flood AdvisoryPHIWarren4 hr
Aug 4, 3:09 AM EDTSpecial Weather StatementPHIWarren51 min
Aug 4, 3:14 AM EDTAreal Flood AdvisoryPHISussex4 hr
Aug 4, 3:55 AM EDTSpecial Weather StatementPHISussex65 min
Aug 4, 3:58 AM EDTAreal Flood WarningPHISussex, Warren33 hr
Aug 4, 5:12 AM EDTAreal Flood AdvisoryPHIMorris3 hr
Aug 4, 5:56 AM EDTAreal Flood AdvisoryPHIMorris3 hr
Aug 4, 6:19 AM EDTFlash Flood WarningPHIMorris4 hr
Aug 4, 8:19 AM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset4 hr
Aug 4, 9:32 AM EDTFlash Flood WarningPHISomerset3 hr
Aug 4, 9:39 AM EDTSmall Craft AdvisoryPHI6 hr
Aug 4, 10:16 AM EDTAreal Flood WarningPHIMorris4 hr
Aug 4, 10:51 AM EDTAreal Flood WarningPHIHunterdon, Somerset4 hr
Aug 4, 12:13 PM EDTAreal Flood WarningPHIMiddlesex, Somerset2 hr
Aug 4, 5:04 PM EDTSpecial Weather StatementPHIHunterdon56 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2018Severe Thunderstorm Warnings in New Jersey, 2018Every severe thunderstorm warning in 2018

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.