Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 256, NWS Philadelphia/Mount Holly

July 21, 20196 counties in Pennsylvania; Hunterdon County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2019, 11:40 PM EDT for 6 counties in Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 50 min. 2 reports 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: Jul 21, 2019, 11:40 PM EDT (03:40 UTC)
Expired: Jul 22, 2019, 12:30 AM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 03:41 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.

What was reported inside it

Time	Report	Where	Remark
Jul 21, 11:57 PM EDT	TSTM WND DMG	1 Ese Lumberville, PA	SEVERAL REPORTS OF TREE BRANCHES AND WIRES DOWN THROUGHOUT BUCKS COUNTY. A CLUSTER OF REPORTS OCCURRED ON ROUTE 32 NEAR LUMBERVILLE. TIME ESTIMATED FROM RADAR.
Jul 22, 12:10 AM EDT	TSTM WND DMG	East Penn Twp, PA	TREE DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 3.7 hours before the alert went out and 212 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2295 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1588 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

998 
WUUS51 KPHI 220340
SVRPHI
NJC019-041-PAC011-017-025-077-091-095-220430-
/O.NEW.KPHI.SV.W.0256.190722T0340Z-190722T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1140 PM EDT Sun Jul 21 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  Northeastern Berks County in eastern Pennsylvania...
  Central Montgomery County in southeastern Pennsylvania...
  Lehigh County in eastern Pennsylvania...
  Southeastern Carbon County in northeastern Pennsylvania...
  Bucks County in southeastern Pennsylvania...
  Northampton County in eastern Pennsylvania...

* Until 1230 AM EDT.

* At 1140 PM EDT, severe thunderstorms were located along a line
  extending from near Beltzville State Park to near Chalfont, moving
  northeast at 30 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...
  Allentown, Trenton, Easton, Lehighton, Bethlehem, Ewing, Lansdale,
  Forks, Emmaus, Northampton, Quakertown, Perkasie, Doylestown,
  Byram, Wilson, Hatboro, Souderton, Bedminster, Ambler and
  Hellertown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4074 7576 4080 7585 4088 7560 4088 7552
      4081 7547 4086 7530 4086 7521 4038 7484
      4038 7487 4035 7486 4033 7494 4023 7480
      4012 7515 4050 7583 4063 7600
TIME...MOT...LOC 0340Z 240DEG 26KT 4083 7557 4026 7518 

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

Staarmann

2 follow-up statements

825 
WWUS51 KPHI 220409
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1209 AM EDT Mon Jul 22 2019

PAC011-091-220419-
/O.CAN.KPHI.SV.W.0256.000000T0000Z-190722T0430Z/
Berks PA-Montgomery PA-
1209 AM EDT Mon Jul 22 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BERKS AND CENTRAL
MONTGOMERY COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4074 7576 4080 7585 4088 7560 4088 7552
      4081 7547 4086 7530 4086 7521 4038 7484
      4038 7487 4035 7486 4033 7494 4023 7480
      4018 7495 4063 7554 4069 7587
TIME...MOT...LOC 0409Z 250DEG 25KT 4080 7537 4027 7484 

$$

NJC019-041-PAC017-025-077-095-220430-
/O.CON.KPHI.SV.W.0256.000000T0000Z-190722T0430Z/
Hunterdon NJ-Warren NJ-Lehigh PA-Carbon PA-Bucks PA-Northampton PA-
1209 AM EDT Mon Jul 22 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR SOUTHWESTERN HUNTERDON...SOUTHWESTERN WARREN...NORTHERN LEHIGH...
SOUTHEASTERN CARBON...CENTRAL BUCKS AND NORTHAMPTON COUNTIES...

At 1209 AM EDT, severe thunderstorms were located along a line
extending from near Kunkletown to near Yardley, moving east at 30
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...
Allentown, Trenton, Easton, Lehighton, Bethlehem, Ewing, Forks,
Northampton, Doylestown, Byram, Wilson, Bedminster, Hellertown,
Nazareth, Palmerton, Bangor, Slatington, Tinicum, Pen Argyl and Wind
Gap.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4074 7576 4080 7585 4088 7560 4088 7552
      4081 7547 4086 7530 4086 7521 4038 7484
      4038 7487 4035 7486 4033 7494 4023 7480
      4018 7495 4063 7554 4069 7587
TIME...MOT...LOC 0409Z 250DEG 25KT 4080 7537 4027 7484 

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

Staarmann

154 
WWUS51 KPHI 220420
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1220 AM EDT Mon Jul 22 2019

NJC019-PAC017-220430-
/O.CAN.KPHI.SV.W.0256.000000T0000Z-190722T0430Z/
Hunterdon NJ-Bucks PA-
1220 AM EDT Mon Jul 22 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HUNTERDON AND
CENTRAL BUCKS COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4074 7576 4075 7577 4084 7557 4085 7550
      4081 7547 4086 7530 4086 7522 4067 7506
      4065 7509 4063 7517 4069 7586
TIME...MOT...LOC 0420Z 266DEG 26KT 4071 7541 

$$

NJC041-PAC025-077-095-220430-
/O.CON.KPHI.SV.W.0256.000000T0000Z-190722T0430Z/
Warren NJ-Lehigh PA-Carbon PA-Northampton PA-
1220 AM EDT Mon Jul 22 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR SOUTHWESTERN WARREN...NORTHERN LEHIGH...SOUTHEASTERN CARBON AND
NORTHAMPTON COUNTIES...

At 1220 AM EDT, a severe thunderstorm was located over Bath, or 8
miles northeast of Allentown, moving east at 30 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, Northampton, Wilson, Nazareth, Palmerton,
Slatington, Pen Argyl, Wind Gap, Bath, Harmony, Alpha, Walnutport,
Belfast, West Easton, Tatamy, Bloomsbury, Steuben and Glendon.

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 4074 7576 4075 7577 4084 7557 4085 7550
      4081 7547 4086 7530 4086 7522 4067 7506
      4065 7509 4063 7517 4069 7586
TIME...MOT...LOC 0420Z 266DEG 26KT 4071 7541 

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

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 8:25 PM EDT	Special Weather Statement	PHI	Carbon, Lehigh, Northampton	50 min
Jul 21, 8:44 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	46 min
Jul 21, 9:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Northampton	51 min
Jul 21, 9:30 PM EDT	Severe Thunderstorm Warning	PHI	Chester	45 min
Jul 21, 9:58 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	2 hr
Jul 21, 10:14 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	46 min
Jul 21, 10:30 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	3 hr
Jul 21, 10:31 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	3 hr
Jul 21, 10:35 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	40 min
Jul 21, 10:42 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	48 min
Jul 21, 10:54 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	25 min
Jul 21, 10:58 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	59 min
Jul 21, 11:05 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	40 min
Jul 21, 11:31 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	44 min
Jul 21, 11:38 PM EDT	Flash Flood Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	2 hr
Jul 22, 12:05 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	40 min
Jul 22, 12:45 AM EDT	Special Weather Statement	PHI	Monroe	30 min
Jul 22, 1:11 AM EDT	Special Weather Statement	PHI	Monroe	34 min
Jul 22, 5:32 AM EDT	Areal Flood Warning	PHI	Lehigh	49 min
Jul 22, 1:28 PM EDT	Special Weather Statement	PHI	Monroe	32 min
Jul 22, 1:50 PM EDT	Special Weather Statement	PHI	Northampton	25 min
Jul 22, 3:18 PM EDT	Special Weather Statement	PHI	Chester	57 min
Jul 22, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	48 min
Jul 22, 3:33 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	7 hr
Jul 22, 3:39 PM EDT	Special Weather Statement	PHI	Berks	51 min
Jul 22, 3:47 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	58 min
Jul 22, 4:11 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Jul 22, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	59 min
Jul 22, 4:40 PM EDT	Areal Flood Advisory	PHI	Delaware, Montgomery, Philadelphia	114 min
Jul 22, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	50 min
Jul 22, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	41 min
Jul 22, 5:05 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	4 hr
Jul 22, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	61 min
Jul 22, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	73 min
Jul 22, 5:34 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Montgomery, Northampton	4 hr
Jul 22, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	80 min
Jul 22, 5:43 PM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 22, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	40 min
Jul 21, 9:05 PM EDT	Special Weather Statement	PHI	Morris	25 min
Jul 21, 10:12 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Monmouth, Morris, Somerset	48 min
Jul 21, 10:13 PM EDT	Severe Thunderstorm Warning	PHI	Salem	47 min
Jul 21, 10:15 PM EDT	Special Marine Warning	PHI		60 min
Jul 21, 10:58 PM EDT	Special Marine Warning	PHI		62 min
Jul 21, 11:02 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	31 min
Jul 21, 11:27 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	48 min
Jul 21, 11:54 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	51 min
Jul 22, 12:00 AM EDT	Special Marine Warning	PHI		90 min
Jul 22, 12:16 AM EDT	Special Weather Statement	PHI	Mercer	29 min
Jul 22, 12:34 AM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	41 min
Jul 22, 2:00 PM EDT	Special Weather Statement	PHI	Sussex	45 min
Jul 22, 2:13 PM EDT	Special Weather Statement	PHI	Warren	32 min
Jul 22, 2:35 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	40 min
Jul 22, 2:58 PM EDT	Small Craft Advisory	PHI		27 hr
Jul 22, 3:02 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	4 hr
Jul 22, 3:12 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	48 min
Jul 22, 3:43 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Jul 22, 4:24 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	51 min
Jul 22, 4:52 PM EDT	Special Marine Warning	PHI		53 min
Jul 22, 5:01 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	44 min
Jul 22, 5:52 PM EDT	Special Marine Warning	PHI		53 min
Jul 22, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	51 min
Jul 22, 6:12 PM EDT	Special Marine Warning	PHI		93 min
Jul 22, 6:21 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cumberland, Monmouth, Ocean	4 hr
Jul 22, 6:27 PM EDT	Special Marine Warning	PHI		48 min
Jul 22, 6:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Monmouth, Morris, Somerset	34 min
Jul 22, 6:35 PM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	4 hr
Jul 22, 6:38 PM EDT	Special Marine Warning	PHI		67 min
Jul 22, 6:54 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Monmouth, Ocean	51 min
Jul 22, 7:39 PM EDT	Special Marine Warning	PHI		96 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in New Jersey, 2019 Every severe thunderstorm warning in 2019

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.